ASTM OIL NO. 3 Chemical compatibility with O-rings, rubbers, & plastics

ASTM Oil No. 3, also identified as ASTM Reference Oil No. 3 or IRM 903 test oil, is a standardized petroleum-based fluid used to evaluate elastomer performance under ASTM testing protocols. It is widely utilized to measure volume swell, hardness change, and tensile retention in O-rings, rubber compounds, and gaskets exposed to lubricating oils. Common in engine and lubrication assessments, ASTM Oil No. 3 requires controlled handling, proper storage, and appropriate PPE to ensure safe testing and reliable rubber compatibility results.

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