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O-Ring Material Selection Guide

  • Standard CompoundSpecial Compound

Rubber compounds are a mixture of polymers, fillers, anti-oxitives and curatives. Various combinations can improve specific properties. Special compounds can be made to broaden temperature range or improve fluid resistance. These may add to lead time, but can lead to better application performance.

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Vamac® [Ethylene / Acrylic]

Material Selection Guide

Vamac® (Ethylene/Acrylic)

Trade Names:

  • Vamac . . . DuPont Elastomers

ASTM D1418 Designation: AEM

ASTM D2000/SAE J200 Type, Class: EE, EF, EG, EA

Apple Compound Designation: VA

Standard Color: Black

Description: A copolymer of ethylene and methyl acrylate, with a small amount of a third monomer added to provide a cure to active groups in the polymer chain, Vamac exhibits properties similar to those of polyacrylate, but with an extended low temperature limit and better mechanicals.

Key Use(s): Seals for automotive applications, such as automatic transmissions & power steering systems.

Temperature Range:
Standard Compound: -13° to +338°F (Dry Heat Only)

Hardness (Shore A): 50 to 90.

Features: Ideal for automotive sealing uses, Vamac features excellent heat resistance, outstanding resistance to ozone and sunlight aging, moderate resistance to swelling in oils, and very low permeability to gases.

With a maximum reinforced tensile strength of 2,500 psi, Vamac's mechanical properties of adhesion to metals, tear resistance, flex life, abrasion resistance and compression set resistance are all rated as "good".

Resistance to water, engine coolant mixtures (glycols), dilute acids and alkalis is also good.

Limitations: Vamac is not recommended for exposure to concentrated acids, aromatic hydrocarbons, "gasoline", ketones, brake fluids and phosphate esters.

 


 

Featured Article

Case Study: Phenyl Silicone Seal for Extreme Low Temperature

Case Study: Phenyl Silicone Seal for Extreme Low Temperature

Recently, one of our customers contacted us about a problem she was having with an O-Ring that sits on a siphon neck of a liquid nitrogen dewar. Here's what we did to help her.

Questions?

*Please use our quick form for all Sample Request, Request for Quote or Engineering Requests.

This tool is meant to be used as a professional guide only. Because no two situations or installations are the same, these comments, suggestions, and recommendations are necessarily general and should not be relied upon by any purchaser without independent verification based on the particular installation or use. We strongly recommend that the seal you select be rigorously tested in the actual application prior to production use.

Questions?

*Please use our quick form for all Sample Request, Request for Quote or Engineering Requests.