This standard provides a reliable means for evaluating corrosive characteristics of seal compounds (radial lip type oil seals, O-ring seals and similar products) when in contact with steel shafts. The test outlined gives reproductible results with a minimum of equipment. Results are expressed in terms of a rating system wherein a corroded test plate (simulating a steel shaft) is compared to five corrosion standards showing graduated degrees of corrosion. When a seal material has been accepted for an application, spot checking of incoming lots may be accomplished on the seal lip itself to determine continuing quality of the product. Ideally, the seal material should have zero rating in regard to its corrosive properties on steel. Realistically, however, a maximum allowable corrosion rating is usually specified for each seal application.