EPDM

EPDM is a terpolymer of ethylene and propylene, plus a small amount of a third monomer (usually a diene). Generally, EPDM has excellent ozone resistance, heat resistance and weather resistance, good elasticity at low temperatures, good chemical resistance (such as many dilute acids, alkalis and polar solvents), and also has excellent insulation properties.

Temperature range

-55 ~ 135℃ (TR10=-52.3℃), organic peroxide vulcanization can reach up to 150℃, special grades of EPDM peroxide vulcanization high temperature application can reach 180℃

Hardness range

Shaw A30 degrees to 90 degrees

Color

Black, purple, brown, gray, or customer-specified colors

Application

EPDM is widely used in the automotive industry. It is a good choice for sealing parts in phosphate-ester-based hydraulic fluids and glycol-based coolant systems. For domestic water, rubber parts must pass chloramine and chlorine resistance tests. Among all EPDMs, the higher saturated EPDM has better chloramine and chlorine resistance. It is also commonly used for hot water or steam at temperatures up to 150°C.

EPDM is not suitable for petroleum liquids (fuel oil, mineral oil, grease).

EPDM is usually added with internal lubrication to improve installation convenience or reduce dynamic friction.

For contact with food or beverages, EPDM can be formulated with "white list" ingredients specified in FDA 21.CFR 177.2600.

For drinking water applications, EPDM can apply for approval from the National Sanitation Foundation (NSF).

EPDM is commonly used in automotive air conditioning systems, for example: using R134a refrigerant mixed with POE or PAG lubricants, and the new environmentally friendly refrigerant R744. EPDM is commonly used in phosphate ester type hydraulic fluids DOT3 or DOT4 brake fluids.

EPDM can be submitted for approval by Underwriters Laboratories (UL) for use in applications specified in UL157.