Ensure the compatibility of the fluids in contact with the rubber materials.

Buna N:
Standard compound for service in petroleum oils, air, water, mild acids, acetylene, kerosenes, lime solutions, liquified petroleum gases and turpentines. Not recommended for high aromatic gasolines or acids.

Silicone:
Known as the only elastomer which under certain conditions can be utilized for both high and low temperature. This is its principal usage. Also handles hydrogen peroxide and some acids. Not good for steam. Very poor disc life. Fluorosilicone compounds noted to have better fuel resistance.

Neoprene:
Principally used in refrigeration systems (Freon 22) as an external seal. Neoprene is also utilized for oxygen service. Suitable for alcohols, mild acids, water, air, ammonia, argon gas, and other gases.

Urethane:
Used for water, air at normal ambient temperatures, alcohols, non-aromatic compounds, ether, edible fats and oils, and hydraulic fluids. Its principal asset is high strength, excellent abrasion resistance. It is not recommended for Ketones, and strong oxidizing agents.

Viton:
Suitable for temperatures somewhat above the Buna N range. Excellent resistance to many petroleum oils, gasoline, dry-cleaning fluids, and jet fuels. Not good for Ketones, halogenated hydrocarbons, and freons.

Ethylene Propylene:
Suitable for temperatures somewhat above the Buna N range. Features similar to butyl (Le., excellent for phosphate ester type fluids and poor on petroleum base types) except ethylene propylene has a somewhat higher temperature range than butyl. On this basis, ethylene propylene has served to replace the formerly used butyl. Useful as "0" ring gaskets on steam valves due to low compression set. Ethylene propylene is generally suitable for most photographic solutions as well as numerous chemical solutions.