EPDM Rubber Testing Services

EPDM, Ethylene Propylene Diene Monomer, is a synthetic rubber elastomer. It is an “M” class rubber based on its classification in ASTM standard D-1418. The compound generally has a high ratio of ethylene (45-75%) in its composition, giving it superior mixing and extrusion properties. Three dienes are commonly used in the manufacture of EPDM – dicyclopentadiene (DCPD), ethylidene norbornene (ENB) and vinyl norbomene (VNB). EPDM is a versatile compound, with many different formulas possible. This allows the compound to be designed for a broad range of applications.

Its main properties are excellent heat, ozone and weather resistance, and superior electrical insulation. Manufactured in sheets or as a liquid, EPDM is the main roofing material used in construction. Its flexibility and resistance to weather and heat make it an excellent material for seals, washers, tubing, belts and membranes. It is also used for electrical insulation. Industries that use EPDM include automotive, construction, and safety.

The most common properties of EPDM are shown in the table below, but the values can vary depending on the formulation. Polyhedron Lab specializes in performing all the tests listed on this table.

Common Properties of EPDM

Density (g/cm3) ASTM D 790 1.10
Tensile strength, psi D412 2523
% Elongation D412 450
200% Modulus, psi D412 1174
Tear Strength, Die C (lb/in) D624 4167
Hardness, Shore A D2240 65
Glass Transition Temperature °C D5026 -60°
Compression Set (%) D395B 20-60
Brittleness Temperature °C D746 -10° to -48°
Water Absorption (%) D471 1.0



Polyhedron Lab performs EPDM rubber testing to ASTM standards. Contact us today to learn more information about our EPDM testing services. Click here to view a list of some of the other types of rubber we commonly test.

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