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Custom-Molded Rubber
O-Rings & Backup Rings
Teflon®
Die-Cut Gaskets
Hydraulic Lip Seals
Kalrez®
Hytrel®

 

 

 

 

 

Custom-Molded Rubber

Buckeye furnishes custom molded rubber parts of every description, for a wide variety of applications, from a wide range of base polymers. We can produce special components to meet your particular requirement.

 

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O-Rings & Backup Rings

The O-ring is the most widely used sealing device in the fluid power industry because it is effective, economical and easy to use. It is available in many synthetic rubber formulations, from basic Nitrile to the high performance perfluoroelastomers. The parameters of fluid, pressure, and temperature will determine which O-ring is best suited for a given application. When pressure forces the O-ring, which is in essence a highly viscous fluid with a very high surface tension, to flow within a grove, it flows against and slightly into any gaps. by blocking the clearance, fluids and gases are sealed in and prevented from escaping. The nature of the O-ring is to remember its original shape and attempt to return to it. This elastomeric memory feature is what precludes an O-ring from extruding into the gaps that it is sealing.

When the width of the extrusion gap (diametral clearance) exceeds design recommendations for the operating pressure, back-up rings are often recommended. The most common back-up rings are molded endless from 90 durometer elastomers, PTFE, or filled PTFE materials. These rings can be machined as split or solid(endless), depending on the ease of assembly into the application hardware.

O-Ring Sizing Chart

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Teflon®

Teflon (PTFE) has exceptional chemical, electronic, mechanical and thermal properties for a multitude of applications. It is resistant to nearly all chemicals and has a temperature service range from -196°C (-320°F) to 260°C (500°F). Perhaps the most useful characteristic of Teflon is that it can be filled with other compounds to add desired properties. The most common of these compounds are glass fiber, carbon, bronze and graphite.

Glass Fiber: Fill percentages vary by weight between 5 and 40%. Within this range, wear properties are improved and there is also an increase in deformation strength. Adding glass, however, increases Teflon's coefficient to friction and its resistance to alkalis and hydrofluoric acid.

Carbon: Fill percentages vary by weight between 10 to 35%. Carbon with graphite improves Teflon's wear and deformation strength properties. Modified electronic properties are the result of carbon/graphite fills.

Bronze: Fill percentages vary by weight between 40 to 60%. By adding bronze to virgin PTFE, maximum wear properties are attained. Bronze filled Teflon also offers greatly improved deformation strengths and good thermal conductivity, but result in poor electrical characteristics and chemical resistance.

Graphite: Fill percentages vary by weight between 5 to 15%. Graphite is most often used in conjunction with other PTFE fillers to lower the coefficient of friction. It also improves deformation strength and offers a slight improvement in wear properties.

Mil-Spec Sizing Charts:

MS27595

MS28774

M8791

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Die-Cut Gaskets

We facilitate the cutting of a wide variety of gasketing materials: All Elastomers, sponge rubber, ptfe, vellumoid, klingersil, cork and rubber, and fabric reinforced diaphragm sheet. We can handle and short run to long run requirements with precision made steel rule dies.

 

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Hydraulic Seals

Lip Seals are designed to close off passageways and close the door of opportunity for fluids to escape. They are predominately elastomeric materials and the most common ones used are Polyurethane and Nitrile, for their overall toughness and resistance to hydrocarbon based hydraulic oils. While there are many different lip seal designs, the U-cup is the most commonly used profile and is uni-directional. It's configuration is the only geometric shape, that when combined with an elastomeric material, can automatically compensate for pressure changes.

In general, the style and elastomeric makeup of a lip seal should be chosen based on its ability to:
•Prevent leakage.
•Be easily installed and removed.
•Be capable of excluding the entry of foreign material.
•Have a long life while requiring minimum maintenance.
•Be compatible with the fluids, operating temperatures and pressure of the application.
•Not contaminate the fluid by degrading.
•Satisfy these requirements as economically as possible.

Review U-Cups

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Kalrez®

 

Kalrez Perfluoroelastomer parts are the result of research which combines the rubbery properties of a fluoroelastomer (FKM) with the chemical stability of the fully fluorinated fluorocarbon resin. The product is a copolymer of the tetrafluoroethylene and perfluoromethyl vinyl ether with small amounts of a perfluorinated comonomer. The resultant polymer is essentially a rubbery analog of Teflon® fluorocarbon resin

The first commercial applications for Dupont's high performance elastomer were in 1971, and in 1975 the Kalrez trademark was adopted. By the late 1970's, 80% of Kalrez perfluoroelastomer business was in the oil patch. Today the predominant market applications for these compounds are CPI and semiconductor, but it also services critical applications in the aerospace, oil and gas, paint spray and pharmaceutical
industries (Kalrez 6230) as well. There are currently more than 25 different Kalrez compounds available to serve the marketplace. The three most widely used are:
Kalrez 7075, Kalrez 6375 and Kalrez 4079 as well as speciality compounds 1050LF, 1058, 3018, and 2037 used in specific CPI applications.

Please contact us at sales@buckeyrubber.com if additional information is required.

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Hytrel®

Hytrel thermoplastic polyester elastomers are designed to provide the flexibility of rubber, the strength of plastic, and the processability of a thermoplastic. Hytrel offers a cost effective approach for applications where thermoset rubber had been the only past alternative. This innovative compound can be processed via injection molding, blow molding, calendaring, rotational molding, extrusion and melt casting.

Hytrel offers excellent flex-fatigue resistance, in addition to high resistance to deformation under moderate strain conditions. Its mechanical properties provide excellent abrasion resistance and outstanding load-bearing capacity. This compound provides you with the strength and stiffness you need, in addition to outstanding toughness. Hytrel retains its strength at temperatures exceeding 120°C (248°F) and most Hytrel polymers have solenoid brittle points below -70°C (-94°F).

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*Kalrez, Teflon and Hytrel are registered trademarks of DuPont Performance Elastomers.