This SAE Standard measures the percent thermal efficiency of materials in sleeve form used to contain heat or insulate around a hot component. The percent thermal efficiency (%TE) is determined by measuring the power difference expended by the heat source (cartridge heater) with and without the test sleeve at the specified temperature. See SAE J2302 to measure radiant heat flow of sleeves.
SAE J2495 was written for a specific part configuration and as a result requires equipment that is no longer commonly available. In addition other methods may be better suited for measuring and comparing the thermal conductivity properties of different materials.