... -340 nm, used in polystyrene, polyester, PC, Perspex, PE, ABS resin. Appearance: Light yellow powderAssay (HPLC): 99.00% minMelting point: 128 ... nm, used in polystyrene, polyester, PC, Perspex, PE, ABS resin, epoxy resin and cellulose resin. It almost absorbs no visible light, especially capable for ...