ASTM OIL NO. 5 Chemical compatibility with O-rings, rubbers, & plastics

ASTM Oil No. 5, also called ASTM Reference Oil No. 5 or IRM 905 test oil, is a standardized petroleum-based fluid developed for elastomer compatibility evaluation under ASTM guidelines. It is commonly used to assess the performance of O-rings, rubber materials, and gaskets by measuring changes in volume, hardness, and physical properties after oil immersion. Frequently applied in engine simulation and lubrication testing, ASTM Oil No. 5 should be handled, stored, and used with proper PPE to maintain safe working conditions and reliable rubber testing outcomes.

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