ASTM Oil No. 2, also known as ASTM Reference Oil No. 2 or IRM 902 test oil, is a standardized petroleum-based oil used for elastomer testing in accordance with ASTM International specifications. This reference oil is commonly used to evaluate volume swell, hardness change, and physical property shifts in rubber materials during laboratory calibration and performance assessments. In chemical compatibility testing, ASTM Oil No. 2 plays a critical role in determining how O-rings and gaskets respond to hydrocarbon-based fluids. Because it is a mineral oil formulation, certain rubber compounds may experience measurable swelling. Proper handling, storage, and PPE are recommended when conducting compatibility evaluations involving O-rings, rubber seals, and gaskets.

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