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.
- Hydrogenated Nitrile
- Liquid Silicone Rubber
- Medical Ethylene Propylene
- Medical Fluorocarbon
- Medical Grade Silicone
- Natural Rubber
- Nitrile (Buna-N)
- Nitrile (Buna-N)
- Polyurethane, Cast
- Polyurethane, Millable
- Styrene Butadiene
- Teflon® Virgin
- Vamac® [Ethylene / Acrylic]
- HyTemp ACM . . . Zeon
- Acralen A . . . Bayer Polymer
ASTM D1418 Designation: ACM
ASTM D2000/SAE J200 Type, Class: DH; DF
Apple Compound Designation: PY
Standard Color: Black
Description: Polyacrylates are copolymers (ethyl acrylates) possessing outstanding resistance to petroleum fuels and oils.
Key Use(s): Sealing automatic transmissions & power steering systems. Sealing petroleum oils up to 350°F.
Standard Compound: -25° to +300°F
Hardness (Shore A): 40 to 90.
Features: With excellent resistance to hot oil, automatic transmission and Type A power steering fluids, the greatest use for Polyacrylate is found in automobile manufacture, where O-rings of this material are employed to seal components of automatic transmission and power steering systems.
Highly resistant to sunlight and ozone degradation, Polyacrylate also features an enhanced ability to resist flex cracking.
Limitations: While resistance to hot air aging is superior to Nitrile, Polyacrylate strength, compression set, water resistance properties and low temperature capabilities are inferior to many other polymers. Polyacrylates are also not generally recommended for exposure to alcohol, glycols, alkalis, brake fluids, or to chlorinated or aromatic hydrocarbons.
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.