SUMILITERESIN® PR-2217 I is a novolac phenolic resin modified with Bisphenol-A, which has good properties for foundry manufacture. Beside modified bisphenol-A, it is designed with a low molecule number and low free phenol monomer in order to obtain high strength, low thermal expansion, and low gas volume. It is preferable to add hexamine about 15%/resin when applied in resin coated sand (RCS).Information provided by Sumitomo Bakelite High Performance Plastics (sbhpp) |