ASTM D991
Standard Test Method for Rubber Property—Volume Resistivity Of Electrically Conductive and Antistatic Products


ASTM D991 establishes the test method for evaluating the resistance of elastomeric materials to swelling when immersed in liquids, particularly mineral oils and hydraulic fluids. The standard applies to vulcanized rubbers and elastomers used in fluid-exposed components such as seals, hoses, and industrial coatings. The test procedure involves submerging specimens in reference fluids at controlled temperatures and measuring changes in mass, volume, and mechanical properties after defined exposure periods. This evaluation is essential for assessing chemical and physical compatibility between elastomers and operating fluids, ensuring reliability and durability of critical industrial components.


ASTM D991 standard webpage
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