EPDM (Ethylene Propylene Diene Monomer)
The EPDM compound is considered the most waterproof, currently available elastomer. Gaskets made of this type of material are most often used in systems such as cold and hot water up to 110°C, waste water, water with acid, deionized water and sea water. EPDM compound is not suitable for use with petroleum-based fuels and oils, hydrocarbon solvents and aromatic hydrocarbons.
Compound Grade Colour code Recommendations for use Maximum range of temperature
Suitable for cold and hot water up to + 110°C, a mixture of water and acid, chlorine water, deionized water, seawater and sewage water as well as diluted acids and compressed air without oil content. Do not use with petroleum oils, mineral oils, solvents and aromatic hydrocarbons.
Warning! EPDM rubber gaskets intended for water supply services are not recommended for use in steam systems, unless the connectors or components are in places allowing for frequent gasket replacement. Incorrect selection of the gasket and mixture may result in a leakage or failure leading to personal or property damage. Gaskets should never be exposed to temperatures above rated values.
NBR, BUNA N and nitrile
They all represent the same copolymer of butadiene and acrylonitrile (ACN) which is inherently resistant to hydraulic fluids, lubricating oils, gear oils and other non-polar petroleum based compounds as well as water at temperature not exceeding 65°C. NBR has low resistance to hot water and steam.
The "T"-type NBR compound is manufactured based on ASTM D2000 standard and exceeds AWWA C606 standard. Type "T" is a general-purpose compound with an average ACN level