Yellowish transparent semi-solid Novolac Epoxy Resin HWR-638 with high mechanical strength Product Name: Epoxy Resin 638 Quality Standard: Tech grade Description: Epoxy resin 638 is a semi-solid reaction product of epichlorohydrin and phenol-formaldehyde novolac. It has advantageous characteristics of good adhesion strength, excellent heat and chemical resistance because of its multi-functional groups in one molecule fully cross-linked. Therefore, it has excellent physical