It (NEMA C) is a thermoset rolled and molded composite consisting of a medium-weave cotton reinforcement combined with a phenolic resin system. RM310 complies with the requirements of MIL-I-24768/16, Type FBM. RM310 is designed for a variety of mechanical applications and is suitable for inserts, bushings, flanges, cams, gaskets, collars, bearings, spacers, plugs, dowels, insulators, and pillow blocks.