Colorless Powder Coating HW-604 820 Hydrogenated Bisphenol A Epoxy Resin Powder Coating State HW604 820 Hydrogenated Bisphenol A Epoxy Resin Powder Coating State Epoxy Resin HW604-820 1. Description: HW604-820 is an unmodified standard solid epoxy resin, which is manufactured by unique taffy process (one stage process: make it directly by BPA and ECH). 2. TDS: Property Unit Value Epoxy Value eq/100g 0.113-0.127 Softening point ℃ 88-92 Hydrolyzable Chloride eq/100g ≤0.003