It is a tube form composed of paper reinforcement combined with a phenolic resin system. RT610 complies with MIL-I-24768/12, Type PBM requirements, and is designed for general purpose mechanical applications. This environmentally sensitive product is not recommended for high humidity conditions, but is suitable for inserts, bushings, gaskets, washers, rollers, collars, spacers, sleeves, insulators, guide tubes, and processing rollers.