CRC Contact Cleaner 2000 Precision Cleaner is an effective alternative to 141b-based cleaners when sensitive plastics are not a concern. Evaporates quickly, leaves no residue, has no flash or fire point and contains no Class I or Class II Ozone Depleting Chemicals. Use on contacts, metal switches, motors, relays, generators, edge connectors, busbars, circuit breakers, scales & sensors. Not recommended for use on LEXAN®, Noryl®, or polycarbonate-type plastics.