Standard Practice for Rubber IRM 901, IRM 902, and IRM 903 Replacement Oils for ASTM No. 1, ASTM No. 2, ASTM No. 3 Oils, and IRM 905 formerly ASTM No. 5 Oil1Reference oil for ASTM D471 Standard Test Method to evaluate the comparative ability of rubber and rubber-like compositions to withstand the effect of liquids.