veriaty of molded seals

Molded Injection/Compression Seals In Medical Applications

Engineered elastomeric shapes are common components in devices used in many industries. In the medical field, they are often used for parts such as disposable seals, medical device bladders, medical device diaphragms, and various subassemblies.

Medical Device Bladder Seals Ensure Accuracy

Blood pressure bladders or cuffs monitor blood pressure by converting expansions and contractions on the surface of the arm caused by the brachial artery, capillary, and venous return system to proportional dynamic pressure changes in the latter of the cup assembly. The change produces an oscilleometric wave, a low-frequency acoustical signal waveform, that passes from the bladder assembly through a hose to a monitor. To make sure that what the monitor measured was an accurate reflection of blood pressure, the assembly used seals between the bladder and the hose. The same principle is used in both single and dual hose cuffs, which are often used on overweight patients with larger arms.

Diaphragm Valves Depend On Properly Engineered Seals

Diaphragm valves, also called membrane valves, are widely used in the bio-pharmaceutical industry as shut off valves for automatic dispensing systems and other equipment. A typical design uses a valve body with two or more ports, a diaphragm, and a seat or saddle where the diaphragm closes the valve. Made of plastic or metal, these valves can be manual or automated, wherein they are controlled by actuators that use air pressure applied to a pilot valve that helps the actuator raise the diaphragm and open the valve. The diaphragms themselves are often made of NR/Natural Rubber, NBR/Nitrile/Buna-N, EPDM, FKM/Viton, or SI/Silicone Rubber.

Seals Crucial To Disposable Medical Products

Modern medical practice makes extensive use of disposable products, which often incorporates molded injection/ compression seals in their design and manufacture. Some of these products might include trocars, used in laparoscopic surgery to insert instruments into the body and in embalming and veterinary medicine to drain fluids or introduce them into the body. The devices have a housing assembly and a piercing stylus inserted into the body. Within the assembly, there are a series of O-rings, quad rings, and advanced seal assemblies, such as duckbill seals.This stays closed until a surgical instrument is inserted on the other end.

To do the job, the seals must meet high performance standards; even if they are disposable, they must accommodate multiple instrument insertions and removals. The materials used must be biocompatible with other materials and capable of reducing seal friction. Most often, the seals are made of silicone (VMQ) or silicone elastomers such as styrene butadiene (SBR) or polyisoprene (IR). Just as important as the material is the exacting design, which must be tested extensively to produce documented evidence that they will withstand usage in the operating room. Seals may be the most important component of a trocar.

Medical Seals That Meet Your Standards

If you use medical seals, you know the importance of having properly engineered product. Engineered seals from Performance Seal meet stringent development and testing protocols. Whatever characteristics you need in your molded compression seals, Performance Seal offers the right Parker product for you. Click here for a catalog or contact us at 800-277-9658.

Veriaty of seals, gaskets, and o-rings

Choosing The Right Engineered Seals For Your Application

When you need engineered seals, you are concerned about both quality and cost. Especially in industries where your products are disposable or where you need high-volume, you want to make sure that your seals are produced quickly and affordably. When you purchase engineered products from Performance Seal, you are acquiring the expertise of the Parker Engineered Seals Division (EDS), which specializes in streamlined manufacturing processes.

What Type Of Seals Do You Need?

While any type of seal you need for your application can be custom molded, many seals fall into certain categories of products such as:

  • Fuel cell seals
  • Axial and radial seals
  • Fuel system seals
  • Oil seals
  • Diaphragms
  • Radiator coolant seals
  • Appliance seals
  • Grommets
  • Bumper
  • Fuel system isolating components
  • Valve components
  • Agriculture components
  • Poultry picking fingers
  • Miscellaneous isolating components

Performance Seal will work with you to find the best design for your application. The company has years of experience in designing elastomeric or metal/plastic retained elastomeric combinations in a variety of materials that meet ASTM standards, as well as the regulations that meet industrial standards
Most seals fall into one of these categories:

  • Homogeneous Rubber. Low-cost and producible in most configurations, homogeneous rubber seals can incorporate design flexibility, sealing beads, or retention features, and offers many functional advantages over traditional round cross-section or flat sealing products.
  • Subassemblies and Finishes. Comprised of multiple parts that range from two to several, assemblies include seals and fittings that can be coated to cut friction in some applications.
  • Rubber-to-Plastic Bonded Shapes. When mechanically or chemically bonded, these components can substitute for more expensive elastomeric compounds, retain the shape, and cut assembly costs by consolidating parts, integrating features, simplifying assembly, and reducing leaks.
  • Rubber-to-Metal Bonded Shapes. Ideal for applications that require structural rigidity, shape retention, and load carrying capacity, these seals offer the advantages of rubber or plastic bonded shapes and can be molded as complex three-dimensional configurations.

What Manufacturing Process Will Meet Your Objectives?

After the design phase, Performance Seal will manufacture your product using the most appropriate molding process for the design you have chosen, as well as your cost parameters and volume requirements. Molding processes might include:

  • Compression Molding. An economical process that offers medium precision, compression molding uses a free-form slab of metal that is placed into a tooling cavity. When the tooling plates are clamped together, the elastomer feeds into the cavity.
  • Transfer Molding. Economical for medium to high precision components, transfer molding forces material from a slab free-form secured above the tooling cavity through screws and into the cavity. This process can produce over molded components where one material is molded onto another without the need for primers or adhesives. Multiple parts can be made at one time.
  • Injection Molding. Economical for high-volume of medium to high precision components, injection molding forces a continuous strip of preformed material through a runner system and into tooling cavities. The process requires reduced cycle time, works for producing over molded components, eliminates flash, and has little waste.
  • Liquid Injection Molding. Economical for producing high-volume, high precision components, liquid injection molding pushes a two-part component into the barrel of the press and mixes it. A pump forces the elastomer to flow into the cavity, which results in specialized products, short cycle times, no flash, and the least amount of material waste.

With all processes, once the elastomer is vulcanized, the parts are removed from the tooling.

Choose The Right Manufacturing Partner

When you work with Performance Seal, your objectives dictate the design, material, and manufacturing process that Parker will use to produce parts just right for your application. Click here for a catalog or contact us at 800-277-9658.

Parker Diamond Seals Perform Under Pressure

Parker Diamond seals are designed to give high sealing pressure in applications with a narrow, molded or machined groove. Even when the mating surfaces are less than ideal, Diamond seals prevent micro-leakage that you may have written off as permeation while using an inferior seal.

A Tight Squeeze Without the Creep

In designs where space is a consideration, Diamond seals are an excellent solution because of their small footprint and narrow cross-section. There’s plenty of room for other system components because Diamond seals don’t require a huge, flat surface to make a robust seal. Unlike standard seals, Diamond Seals are engineered to compensate for slight variations in the mating surfaces, due to molding and machining tolerances, or wear.

Since they can function at significantly lower loads than basic seals, gasket creep is drastically reduced. Even on a less-than-perfect surface, you’ll get a solid seal. Because the Parker patented design is self-retaining, and with its "press-in-place" technology, you’ll get a premium seal in less time, every time.

Pinch Pennies, Not Seals

Parker’s molded Diamond seals are designed to do the most work with the least material, which ultimately saves you money. With fast, simplified installation, you’ll save on labor. Thanks to high sealing pressures, your equipment will spend more time running at peak efficiency, and less time in the shop for repairs and maintenance. With less leakage, your mechanics will spend less time scraping and cleaning surfaces, which also reduces the wear and tear on your components. Fewer failures means fewer warranty repairs, and more reliable products means your customers will be back for more of your products, and making more referrals.

Dependable Performance, Flexible Application

Diamond seals are currently used in a wide variety of applications, from motorcycle fuel distribution systems to portable dialysis equipment, fuel cells, RFID enclosures, and diesel engines. Diamond seals are available is nearly every compound Parker makes, so you know you can find your perfect balance between chemical resistance, thermal performance, seal load, and regulatory compliance.

Whether you need manifold seals, cover seals, or some other kind of face seals, if the seal you need isn’t already in production, Parker can design one specifically for your needs. With optional retaining ribs, Diamond Seals will stand up to the rigors of assembly line conditions and shipping assembled units, with no slippage or loss of performance.

Seal Solutions Made Simple

Put an end to time wasted in assembly and installation re-work, wasted materials, warranty work, and angry customer calls. Increase your product quality and reliability, assembly efficiency, and customer satisfaction by trading up to Diamond seals for a more profitable and successful business. Performance Seals is an authorized distributor of the full line of Parker Seals. Contact a representative to learn how Parker’s Diamond seals and other premium gasket products can help streamline your business operations and boost your product’s reputation. You can also request a quote online.

O-Rings

Parker O-Ring Kits Are First-Aid for Your Equipment

They say an ounce of prevention is worth a pound of cure. You keep first-aid kits on hand in case something unexpected happens to one of your people. But what if some unexpected thing happens to your equipment or product? Will it be a minor bump in the road or a major hassle? That depends on your preparation.

Expect the Unexpected

Whether you’re an operator, a manufacturer, or a repair shop, someday, you’re going to find yourself missing an o-ring that you need right now. You’re diligent in managing your inventory, and it’s obviously not cost effective to keep a large inventory of every part you may potentially need on hand at all times. But life, especially where it involves machinery, is full of surprises. And, just like that first-aid kit ensures that you have solutions for the most commonly experienced mishaps for humans, a well-designed o-ring kit keeps your business running smoothly.

Perhaps you get more warranty work than expected, maybe there’s a manufacturing issue that causes excess waste, maybe there’s a blizzard that delays your shipment from your supplier. Whatever the reason, you’re going to be left in a holding pattern if you don’t have a backup supply to tide you over. If an o-ring fails in the field, having a kit on the equipment may make the difference between a quick repair and a lost day.

Stack the Odds in Your Favor

Parker offers standard assortment kits of 0-rings in metric and SAE sizes, in nitrile (NBR) or fluorocarbon (FKM). Each standard kit includes assorted sizes of O-rings, for a total of about 500 pieces, depending on the kit. The compact kits are housed in a durable box, neatly organized and labeled, to speed you through urgent situations.

  • Kit #1 – Supports most American-built equipment, and contains 30 of the commonly needed o-ring sizes.
  • Boss Seal Kit – Designed with hydraulic fittings in mind. The Boss Seal Kit includes all 20 standard tube fitting seals, for tube opening diameters ranging from 3/32" to 2".
  • Metric Kit #1 – Supports equipment made overseas, and contains 32 of the most commonly used metric-sized o-rings.

 

The standard kit and metric kit feature 70-durometer nitrile, which is compatible with petroleum grease and oil, hydraulic fluid at temperatures up to 250°F, and water glycol hydraulic fluid up to 120°F

The Boss Seal Kit includes o-rings made of 90-durometer nitrile, compatible with higher pressure systems. This kit can be upgraded to FKM material for more demanding applications.

If you’re working with specialty applications, Parker can build custom o-ring kits for your shop’s specific needs, and custom kits designed to ride along with your equipment in the field. With a huge range of materials to choose from, and endless sizing options, it’s easy to ensure that you’ve always got the right o-ring on hand.

Premium Product, Superior Service

Performance Seals is an authorized distributor of Parker seals, and with more than 30 years of industry experience, we're uniquely qualified to help you select or design exactly the right o-ring kits for your business. Call today to learn more about saving time and money with Parker o-ring kits, or request a quote online.

Parker EZ-Lok Seals Speed Install, Reduce Downtime

Your business relies on keeping its equipment running to get the job done. There is no room in your schedule for leaky seals, stretched-out o-rings, and re-working installations. Parker’s EZ-Lok seals are designed to work in applications with dovetail or undercut grooves, to ensure that the seal mounts without twisting or elongating, and seats properly the first time, every time.

EZ-Lok seals are specially manufactured with tiny protrusions, evenly spaced along the inside and outside edges, giving a visual confirmation that the ring is both straight and un-stretched. Once the o-ring is seated in the groove, the protrusions flatten out, and don’t interfere with the precision seal.

Time is Money

Every minute your equipment is out of commission, is a minute you’re paying an operator not to work. Whether you’re doing routine maintenance or emergency field repairs, you need that machine back in operation fast. When your mechanics are in a hurry, it’s easy to twist an o-ring or stretch it out trying to get it into the groove. In the best case, they’ll notice right away, waste the brand new seal that is now ruined, and install another. In the worst case, your crew will notice there’s a problem after the equipment is back in service and starts to leak. Now, you’ve got a machine performing poorly, more downtime, and possibly even bigger repairs to undertake.

Engineered for Success

The engineers at Parker Seals heard these accounts over and over from customers, and began researching a solution. The result is a simple, patented design: the EZ-Lok seal. The protrusions molded into the inner and outer edges of the seal give a simple, effective way to tell at a glance that the seal is in straight, and because the protrusions are evenly spaced, it’s also obvious when the seal is elongated or pinched. EZ-Lok seals are designed to seat right the first time, get your equipment back in action, and let your mechanics move on to the next project. Maximum efficiency is maximum profit.

The Right Material for Your Application

EZ-Lok seals are manufactured for stock in thermoplastic elastomers (TPU, TPR), and, for dynamic applications, in PTFE and rubber. The seals can also be custom-molded in made-to-order compounds, for specialized applications like optical and medical equipment. These are synthesized in a clean room environment for superior quality and safety.

A Simple Change for the Better

Sometimes, a small change can make a big difference. Switching to Parker EZ-Lok seals for your equipment with dovetail or undercut grooves will improve your operation’s efficiency, and reduce costs in waste, downtime, and labor. Performance Seals is an authorized Parker distributor, and offers the full line of Parker seals; whatever application your business has for o-rings, Performance Seals has the right solution. Speak to a knowledgeable representative or request a quote from Performance Seals today.

Parbak Backup O-Rings Prevent Extrusion

Perfect fit is needed for an O-ring to properly do its job, but pressure at high temperatures can make the O-ring weak. It can force it to extrude beyond the groove in which it rests into the clearance gap where two parts come together. As material from the O-ring is lost, the seal it is meant to create can fail. When engineers combat this problem, they often look toward backup O-rings to keep the original one strong.

Why O-Rings Fail

O-rings are designed to rest in a groove. When the opposing part first places force on the O-ring in a perpendicular direction, the ring continues to provide a good seal until the force exceeds its limits. At this point, the ring deforms to the point where some material is caught in the gap when more pressure comes down upon it. In designing the O-ring assembly, the groove has some room for expansion but pressure can ultimately push it past its limits. The point at which the O-ring needs an anti-extrusion device (a backup O-ring) depends on the type of elastomer, the pressure, the Shore hardness, the size of the clearance gap, and the amount of 'breathing' that occurs in the middle parts.

Preventing O-Ring Extrusion

There are several solutions to preventing this weakening of O-rings through extrusion:

  • The clearances can be reduced so that there is less extrusion gap, a very costly solution.
  • The O-ring can be made of a material with a higher durometer or degree of hardness. While a harder seal is less likely to extrude under pressure, this type of O-ring does not seal as well under pressure.
  • A backup ring made of hard extrusion-resistant material can be placed between the O-ring and the extrusion gap to prevent O-ring material from being pushed into the gap. Backup rings are made of a much harder material with increased resistance to pressure. When used in conjunction with an O-ring, a backup ring helps create zero clearance in the gap.

 

Common materials for backup O-rings include high durometer nitrile, nylon, Hytrel, PTFE, or leather, while the shape of the ring can be circular or crescent shaped, a broken or unbroken ring, flat or contoured.

Parbak Backup O-Rings From Parker

The Parbak line of O-rings made by Parker:

  • Are easily stretched into place.
  • Are continuous for uniform contact with all surfaces subject to pressure, which eliminates wear spots.
  • Are quick and easy to assemble to minimize assembly costs.
  • Are designed to fit securely in the O-ring groove.
  • Are hopefully trapping lubricant, which reduces friction, while preserving the O-ring.
  • Are available in standard or custom sizes.

 

Parbak rings are often used in pairs, one on each side of the O-ring. The most common material is hard rubber (high durometer nitrile), which functions in temperatures from -40°C to 120°C (-40°F to 250°F.) For higher temperatures, rings are often made in polytetrafluoroethylene (PTFE), which can withstand up to 204°C (400°F).

To complement our line of Parker O-rings, Performance Seals also offers Parbak backup O-rings and hydrometer materials to enhance the performance of elastomers. For assistance in finding the right backup O-ring, you can view the catalog, contact one of our technical representatives, or visit our website.

What Is The Right Type Of O-Ring For Your Industrial Application?

O-rings are a versatile type of sealer that is used in many types of equipment, in many industries, to help make equipment run smoothly and reliably. While some are made of metal or thermoplastic material such as PTFE, most are molded from elastomers and work with a supportive gland as an assembly that prevents gas or fluid from escaping.

The O-ring does its job under pressure. When it is put in place, it is mechanically distorted from its rounded shape in order to block floors or gases, which a properly installed O-ring can effectively do until the pressure exceeds the limits of the material used to create it. Many seals can withstand fluid pressures of up to 5000 psi. In order to obtain needed performance from an O-ring, it is important to select the proper material, the right size, the right design, and the right type.

Types Of O-rings

There are several types of O-rings available to meet the challenges of industry

  • Static seals are used in situations where the mated parts of the O-ring do not move or, more likely have minimum movement. For example, seals at pipe or tube connections, undercover plates, or under a boulder head or rivet, serve more as flat gaskets.
  • Reciprocating seals are used when there is fast reciprocating motion between an inner and outer element, so that the O-ring slides or rolls along with the reciprocal motion. Hydraulic actuators within a good piston rod or a piston within a cylinder are examples of reciprocating seals.
  • Oscillating seals are used when the seal will move in relation to other parts of a device and then is moved in the opposite direction to return it to its original position, such as with the valve handle and faucet.
  • Rotary seals, unlike oscillating seals, operated in situations where the ceiling elements turn around the shaft only in one direction, without starting and stopping actions after brief periods of motion, as with seals on motors or wheels on fixed axles.
  • Seat seals function as washers to close a flow passage. The O-ring distorts mechanically whether the sealing occurs with impact or not. Seals at the end of solenoid plungers, or on the face of a spiral threaded valve are examples of this type of o-ring.

 

  • Pneumatic seals, while they can be any of the previously noted types of seals, are classified as pneumatic when they are used with gas instead of liquid.

Meeting The Installation Needs Of Industry

Some O-rings are installed in specific ways to meet the needs of the application. For example:

  • In vacuum sealing installations, the seal protects a vacuum chamber and does not endure some of the same pressure as other similar seals.
  • In crush installations, an otherwise static O-ring is permanently deformed by the pressure. In cushion installations, the O-ring prevents moving metal parts from absorbing the force of shock or impact.
  • In rod wiper installations, one O-ring cleans a reciprocating chapter rod, so as to protect other O-rings on machinery in dusty and dirty areas.
  • In low-power drive belt installations, O-rings do a superior job.

Finding The Right O-ring

For top performance, finding the right type of O-ring is crucial. When you want a source for properly designed O-rings to meet your application, you can't go wrong with Performance Seals, a supplier of Parker O-rings. By looking at our handy O-ring catalog and using the Parker inPHorm software to custom-design the O-ring glands and seals you need, you can match the capabilities of different types of available seals to the job at hand. When you are ready to make a selection, one of our experienced technical advisors is always on hand to offer design suggestions or a quote, whether you specialize in aerospace, climate control, electro mechanical, filtration, fluid and gas handling, hydraulics, pneumatics, process control, or sealing and shielding.

No matter what your industry, Performance Seals offers O-rings you can use. Click here for a catalog or contact us via our website.

What Are Special Seal Requirements For The Food Processing Industry?

As with O-rings, gaskets, and seals used in any industry, those designed for the food processing industry must meet the demands for reliable components made to spec, and be capable of providing the sealing capacity you need. In addition, since the equipment is used to handle and process food, beverages, meat, dairy products, pharmaceuticals, and other consumables, rubber products must meet FDA standards as food grade.

Ensuring Food Safety

The FDA has special requirements for the material used in equipment components used for all aspects of processing and packaging.

  • DA CFR 21.177.2600 paragraphs A to D covers "rubber articles intended for repeated use" and lists ingredients that can be used in rubber compounds, as well as the percentage of ingredients, for products used throughout the food manufacturing, preparation, and transportation process.
  • FDA CFR 21.177.2600 paragraphs E and F list specifications for FDA approved rubber seals that will come into contact with extractable aqueous or fatty foods, this regulation also specifies extraction test limits and requires documentation in the form of a manufacturer's FDA certificate to assure compliance

Types Of Elastomers Used In Food Processing

The FDA approves the use of rubber polymers that are resistant to the buildup of bacteria, resistant to chemicals, are flexible, odorless, and tasteless, and that perform well under a large array of working temperatures. The materials include:

  • FDA Silicone Rubber functions at temperatures ranging from -67°F to 450°F FDA and is used for numerous food service applications.
  • Nitrile (Buna-N) Rubber withstands temperatures of -40°F to 212°F and is known for its high resistance to animal fat and vegetable oils. It can handle suction and discharge for food and dairy products.
  • FDA EPDM Rubber handles a temperature range of -40°F to 250°F in applications that demand both flexibility and ruggedness. Made from odorless and tasteless compounds and usable in applications involving a transfer of oily substances, the products are used in food and beverage, dairy, and other applications.
  • FDA Neoprene® Rubber performs at temperatures ranging from -30°F to 220°F and is intended for repeated food exposure as it has excellent oil resistance. Is frequently used for food processing and industrial applications

Where Are FDA Approved Gaskets And Seals Used In Food Processing?

Within the industry, FDA approved elastomers are used in many types of equipment that use parts, such as:

  • Food Grade Gaskets & Seals
  • FDA Compliant Gaskets & Seals
  • FDA Dust Covers
  • FDA Suction Cups
  • FDA Rubber Shields
  • FDA Flexible Rubber Couplings
  • High Purity Gaskets & Seals
  • Sanitary Gaskets & Seals

Performance Seals Meets Your FDA-Approved Elastomer Needs

When you need O-rings, gaskets, and seals made from FDA approved rubber compounds, Performance Seals can help you find the right material and design to help meet your needs. The Parker O-rings and seals are made to your specifications so that they meet all external requirements from the FDA and other bodies, while ensuring that they will keep your equipment operational.

For O-rings and other seals to meet the needs of the medical industry, Performance Seals offers O-rings you can use. Click here for a catalog or contact us via our website.

Medical Applications For O-Rings

In the medical industry, O-rings and seals play an important part in ensuring that equipment runs properly. From instruments used by doctors and dentists, to large equipment such as kidney dialysis machines, to analytical and testing equipment, high quality O-rings resistant to temperature, chemicals, and electrical interference play a role in providing high-quality medical care.

Requirements For Medical Grade O-Rings

Medical applications often use seals, extruded profiles, spliced and fabricated products and custom molded or machined shapes in addition to O-rings to cushion, seal, isolate chambers, and minimize vibration in delicate instruments, implants, components, and equipment. Many of these O-rings and seals are engineered to meet specific performance requirements in both design and materials, such as:

  • Must perform in static and dynamic applications
  • Superior sealing to prevent fluid or gas loss
  • Flexible enough to use in multiple applications, with custom-designs available upon request
  • Proper compression set to ensure that O-ring will return to original thickness after use, despite temperature variations, squeeze over time, and contact with fluid
  • Cost effective
  • Compatible materials to meet specs developed for life science applications
  • Compliant with approvals and standards required in the industry

Meeting Standards For Medical Grade Products

O-rings and other seals used in medical grade products must often meet requirements from the FDA and other bodies to verify that they are properly manufactured for use in medical devices and other life-sciences applications. This prevents contamination during manufacture, and also to prevent failure during usage which could cause equipment or a process to shut down. Some of the standards that might apply to materials and manufacturers include:

  • United States Pharmacopeial sets standards for medicines and healthcare products produced in the US. USP VI-approved elastomers meet standards for biological reactivity and physicochemical properties when used in medical devices that require contact with human or animal bodies or bodily fluids, as well as medical devices.
  • FDA, Title 21, Part 177.2600 also covers elastomers or rubber products used for repeating usage in medical, farmer, biochemical, and food industries.
  • ISO standards, such as 10993 for medical devices and 14644-1 Class VII which regards clean rooms for manufacture.

Materials To Do The Job

Parker O-rings and gaskets offered by Performance Seals are made from elastomers that meet FDA and USP VI standards. Common materials include:

  • Ethylenepropylene, which is resistant to many chemicals
  • Fluoroelastomers, which are resistant to heat and chemicals
  • Perfluoelastemers, which are resistant to high heat and chemicals even under prolonged conditions
  • Nitrile, which has good mechanical properties, resistant to greases and lubricants, and affordable
  • Silicone, which is resistant to ozone, weathering, and aging, and capable of functioning under a wide temperature range
  • Thermoplastics, which is a harder plastic material

Applications In Disposable Products And Medical Equipment

With a wide variety of materials and infinite design options, Parker O-rings rind their way into a variety of disposable medical supplies and equipment:

  • Catheters
  • CPAP devices
  • Dental drills and implants
  • Drug delivery devices
  • Endoscopes
  • Hearing aids
  • Home oxygen concentrators
  • Medical electronics
  • Ophthalmology lens production
  • Pharmaceuticals
  • Prosthetics
  • Respiratory equipment
  • Surgical drills and saws
  • Surgical Trays
  • Urological/gynecological equipment
  • Veterinary equipment

For O-rings and other seals to meet the needs of the medical industry, Performance Seals offers O-rings you can use. Click here for a catalog or contact us via our website.

O-Rings Withstand Demands Of Automotive & Transportation Applications

In the automotive and transportation industry, O-rings take a beating. Often used in airbrake systems, engines, transmissions, and other parts of the vehicle, O-rings are exposed to grease, oil, brake fluid, refrigerants, and a variety of other chemical-based fluids. They must also withstand harsh conditions imposed by temperature, speed, and usage. Both the materials used in the design must be just right to withstand deterioration and wear.

O-ring Applications For Automotive And Transportation

The transportation industry uses O-rings in many specific parts of the vehicle including:

  • Brakes/ABS
  • Cooling/air conditioning
  • Fuel and diesel injection, spark plugs
  • Quick connects, couplings, gear units
  • Shock absorbers
  • Steering systems
  • Transmissions and radiators

Challenging Conditions Demand The Right O-Rings

Every vehicle system poses its challenge for O-rings.

Braking systems are crucial to the safety and operation of any vehicle. Within the breaking circuit, a glycol base synthetic oil provides constant performance within temperatures that can range between -40 degrees C and 150 degrees C. O-rings using the circumstances must retain their shape and stability even as pressure varies. The most common elastomer used for O-rings in Braking Systems is a PDM Perox base, which works well with glycol based oils.

Within engines and transmissions, the oils are mineral based and often contain additives such as anti-forming antioxidant agents. The temperature varies greatly depending on exactly where the oil passes in the system. This demanding usage puts extreme pressure on O-rings, which makes elastomer compounds such as ACM, FPM, and NB the best ones to withstand the conditions.

Every system that utilizes O-rings has its own performance requirements for them, which makes choosing the right elastomer crucial for proper operation.

Finding The Proper Material

Performance Seals offers the finest Parker O-rings in materials to suit the needs of the transportation industry. Popular elastomers for this use include:

  • Acrylonitrile-Butadiene (NBR)
  • Butyl (IIR)
  • Chloroprene (CR)
  • Ethylene Acrylic (AEM)
  • Ethylene Propylene (EPDM)
  • Fluorocarbon (FKM)
  • Fluorosilicone (FVMQ)
  • Hydrogenated Nitrile (HNBR)
  • Perfluoroelastomer (FFKM)
  • Polyacrylate (ACM)
  • Polytetrafluoroethylene (PTFE)

In selecting the proper elastomer for O-rings, you can determine the material based on the specific chemicals that will be compatible with it. Whether you need a stock or custom product, there is a Parker O-ring that will work with your application to provide long-lasting service that will also meet appropriate industry standards, such as:

  • NSF
  • Underwriters Laboratories (UL)
  • Military (MIL-SPEC)
  • Aerospace (AMS)
  • NASA
  • FDA
  • USDA
  • USP
  • Customer-specific requirements

Design Tools For O-Rings

As you determine the proper material for your O-rings, you can even have a hand in designing them with Parker Total InPHorm software. With a simple interface that will guide you through the design process for O-rings, as well as for hydraulic and pneumatic, static face and standard composite seal, or EMI shielding and thermal management products, you can spec your needs against the Parker database of part numbers, standards, and reference materials to verify that what you choose will meet your requirements. You may find that the Parker O-rings handbook will help you make your decision.

For O-rings equipped to meet the demands of the transportation industry, Performance Seals offers O-rings that are right for your needs. Click here for a catalog or contact us via our website.

What Performance Characteristics Are Important In Your O-Ring Application?

In choosing the right type of O-ring material for operation your application, you want an elastomer that will withstand conditions common in your industry. With a wide range of rubber compounds available, you can select a material that will have the right physical characteristics to make it compatible to your use, with the gases and liquids it will interact with.

Properties Required By Elastomer

O-rings are intended to do a job of preventing leakage of gas or fluid from the point of the seal and must offer three basic characteristics:

  • Effectiveness Will the O-ring protect against the infusion of solids, liquids, or gases without its effectiveness been compromised?
  • Hardness How will the O-ring perform under pressure?
  • Toughness How resistant is the O-ring to physical forces such as pressure, elongation, and compression force

In addition to these two general properties, materials used for elastomers are often rated on a scale from poor to excellent, with certain properties being more important in certain usages than others. In deciding the best material for your O-ring applications, you need to consider many things. These often include:

  • Abrasion resistance How wear resistant is the compound when the surface is scraped around, as in dynamic applications?
  • Acid resistant Will the O-ring corrode and fail or facilitate corrosion on metal parts?
  • Chemical resistance Will the O-ring corrode in the presence of certain chemicals?
  • Cold resistance Especially in cryogenic applications, how will cold effect the performance of the O-ring?
  • Dynamic properties When the O-ring is subject to movement in a dynamic application, how does it hold up?
  • Electrical properties Will the O-rings adequately provide a seal, while shielding equipment from electromagnetic disturbances and protect it from electronic noise?
  • Flame resistance How will the O-ring seal respond in extremely high temperatures?
  • Heat resistance How will the volume, hardness, and compression set of the O-ring react to high temperatures?
  • Impermeability Will gas pass or diffuse through the elastomer, a special concern in vacuum service applications?
  • Oil resistance Will oil or additives in the product impact the effectiveness of the O-ring?
  • Ozone resistance Will the rubber crack or dry rot after exposure to ozone in the air?
  • Set resistance How well will the elastomer recover after it has been squeezed or subjected to high temperatures for a long time?
  • Tear resistance How likely is the elastomer to tear, nick, or cut during assembly, a warning of premature failure?
  • Tensile strength What is the result of pressure on the elastomer?
  • Water/steam resistance After water is converted to steam, how does the O-ring react to the heat and water swell, as it absorbs moisture?
  • Weather resistance When used outdoors or in harsh climates, how do the O-rings hold up?

Choosing The Right Parker Elastomer

When choosing the proper elastomer that will hold up and perform for your application, Parker offers charts in its online material and its InPHorm software interface that guides your material selection. If you need an elastomer with excellent acid resistance, you might choose a fluorocarbon, which is also heat and oil resistant, while having only fair tear resistance. If you need weather resistance, neoprene gives you that while offering fair set resistance. Nitrile is good to excellent in a dynamic situation, while offering resistance to ozone and extreme heat.

Whatever characteristics you need in your O-rings, Performance Seals offers the right Parker product for you. Click here for a catalog or contact us via our website.

Reduce NARs With The Parker Sure Torque Assembly And Gaskets

When shipped by rail, many liquids are shipped in tankers, where the contents are accessed via a hinge and bolted cover known as a manway. Having a dependable O-ring seal between the tank and the cover is important to prevent leakage and contamination. When hazardous materials are being shipped in the tanks, which is the case with 1.5 million tanker shipments each year, the risk of seal failure means the release of possibly toxic chemicals into the air. Since ethanol and ethanol related products comprise 330,000 tanker shipments, the risks are particularly high with this product. As reported by The Renewable Fuels Association, between 2007-2012, there were over 730 reported Non-Accident Releases (NARs), with nearly a third of these traced back to a problem with a hinge and bolted manway.

A manway consists of a hinged cover that closes against the nozzle of the tank with an O-ring gasket. The assembly is held in a closed position with a series of eyebolts attached to the nozzle that protrude above the cover and are fastened in place with a washer and nut. This assembly is intended to remain in place throughout shipment, but is subject to fail in certain conditions:

  • The gasket has imperfections that prevent proper sealing.
  • There is not sufficient pressure on the cover, nozzle, or gasket surfaces based on both the temperature range and the internal pressure on the joints.
  • As a result of corrosion, self-loosening, galling or cold welding, or stress corrosion cracking hardware, the eyebolt fails.
  • Either the eyebolt or the gasket stretches or relaxes when temperature and pressure change.
  • The gasket, which should be replaced each time the manway is opened, is reused.

In most cases, the gasket itself is effective when properly replaced and when the bolts are tightened or torqued in the way specified by the Association of American Railroads. The approved method is to tighten them three times with a calibrated torque wrench in a star pattern. However, technicians often use the impact wrenches and do not check old tension requirements, which results in uneven bolt torque, poorly seeded gaskets and lids, and failure of the unit to prevent NARs. Even if the technician properly installs the gasket, tanks can lose up to 60% of their pre-load torque.

While supplying high quality gaskets to the industry, Parker O-rings supplied by Performance Seal avoid many of these problems due to the Sure Torque™ system which preserves the gasket and makes installation failsafe.

Why is The Parker Sure Torque™ Assembly So Effective?

In most installations, the gasket seated on the manway nozzle interfaces with the hinged lid. This makes factors such as gasket placement, worn gaskets, and gasket deterioration more likely. The Parker product protects the gasket so that the bolt does not catch on the gasket and the closure is metal to metal to metal, as the cover and nozzle are closed via the bolt. The technique reduces 52% of NARs, as the bolts, which can now be tightened with an approved impact wrench, retain the proper torque and loses less than 1% pressure. In addition, gaskets can now be used up to 30 times, rather than replacing them frequently with each torque - a cost saver that also preserves the integrity of the material in the tank.

Since the Parker assembly is compatible with most nozzles, tank owners can economically convert an entire fleet of tanks, which will result in reducing or eliminating the major causes of manway-related NARs: loose bolts, gasket misalignment, gasket deterioration, or missing gaskets. For information about the Parker Sure Torque™ Assembly and the Parker Manway Nozzle Gasket, look to Performance Seals.Click here for a catalog or contact us via our website.

Find Durable Gaskets And Seals For The Solar Power Industry

Solar power offers both homeowners and businesses an excellent way to save on utility bills and use resources more efficiently by collecting and repurchasing the sun's energy. Getting the most from this exciting technology requires well designed and built solar collectors and safe, correct, and durable installation of solar heating systems on the rooftop or on the ground. Both the building and the installation of solar equipment utilize a variety of gaskets and seals.

Use High Quality Seals That Meet Industry Standards

When installing the panel on a roof, wall, or ground location, the seals used in this process must be built for performance and comply with requirements from several regulatory bodies. For example,

  • ASTM, a standards body that tests materials, has many specifications that cover O-rings and seals including ASTM D3903-15 for rubber seals used in air heat transport of solar energy systems, which applies to ducts and damper seals, and ASTM D3667 and D3771 for seals designed for the solar collector. These ensure that the materials will adequately meet the challenges of long-term service.
  • UL (Underwriters Laboratories) has standards that cover formed gaskets and seals under its category number JMLU2, which covers properties such as tensile strength, tensile set, compression set, elongation, low temperature, and hardness, production, and retention of the properties after aging. Sheet gaskets are covered under JMST2, while certain O-rings, shaft seals, and more are covered under JOHX2.

Performance Characteristics For Seals Used In The Solar Power Industry

Some of the seals needed for solar projects which are covered by the various standards include:

  • Non-outgassing profile gaskets for around glazing
  • Weatherproof molded seals or grommets for connection points around hoses or cables
  • Dynamic seals, profiles, and molded parts made of high-tech materials optimized for performance
  • Flat gaskets, O-rings, and custom molded seals using installation
  • Seals for peripheral equipment such as pumps, storage tanks, heat exchangers, controllers, and fittings

Contact Performance Seals For Quality Parker O-Rings And Seals

When considering seals, gaskets, and O-rings for your solar power application, Performance Seals offers stock and custom products needed for the manufacturing and installation. With handy Parker O-ring sizing charts, catalogs, and spec sheets, you can determine just what you need for precision sizing and longer gasket life. Need advice on what to order? An experienced technical support staff can help you find gaskets and seals made of the high-tech material you require. It will come to you in a code labeled, heat sealed bag that makes for easy use and an even easier inventory management. Click here for a catalog or contact us via our website.

How Do O-Rings Differ From Gaskets?

Within the broad field of gaskets, O-rings stand out as a type of mechanical gasket that serves as a seal between two parts. Its rounded doughnut-like shape is considered a torus, as it is made of a loop that has a round cross-section that sits in a groove and compresses under pressure to create a seal. Used in static or dynamic applications where there is motion, the O-ring is a simple and reliable seal that is often highly engineered to perform in a certain way. Because an O-ring requires a smaller point of contact between the seal and the parts, it is appropriate for use in very small spaces.

What Is A Gasket?

The term "gasket" applies to any mechanical seal used between two surfaces that mate together. Their purpose is to prevent leakage from the space between two parts that are compressed together, even if the objects do not fit together perfectly. Depending on the application, gaskets can be made of a variety of materials including metal, cork, silicone, felt, neoprene, fiberglass, compressed fiber, graphite, paper, and a variety of synthetics. They can come in virtually any shape, so that they can look like a sheet cut to size for a particular application, or be more like a small part.

There are three basic configurations of gaskets:

  • Round or cross-section gaskets and seals are molded or extruded in a round shape that creates a higher load point that requires a low compressive force to keep the seal in place. The result is to make a better seal. The O-ring is the most common example of a round gasket.
  • Rectangular gaskets are large enough to cover the whole mating surface where parts are brought together. More force is needed to compress this type of gasket, which is often die or laser cut for quick and easy production.
  • Reciprocating gaskets molded of rubber or synthetics, are used in applications to reduce friction. The production process makes them more expensive as there is a high start-up cost to designing and creating the mold.

The Advantage Of O-Rings

While O-rings can be made in many materials, those extruded from elastomers excel in sealing under high pressure conditions. Each one is placed within a gland made of metal or other rigid material that contains or supports the O-ring to constitute an O-ring seal assembly. The assembly prevents pressure sapping loss of fluid or gas in many applications. While they can be used in static applications, their great advantage is that they can be used in dynamic applications, such as rotating shafts.

Contact Performance Seal For Quality Parker O-Rings

When considering O-rings for your application, Performance Seal offers high quality Parker O-rings for use in many industries, such as aerospace, climate control, electron mechanical, filtration, fluid and gas handling, hydraulics, pneumatics, process control, and sealing and shielding. Click here for a catalog or contact us via our website.