raviolet radiation with the wavelength of 270-380 nanometers, mainly applied to polyvinyl chlornamee, polystyrene, unsaturated resin, polycarbonate, poly (methyl methacrylate), polyethylene, ABS resin, expoxy resin and cellulose resin. This product almost does not absorbing visible light, particular applicable able to colorless transparent products and colored products. Dosage:0.1-0.5% for thin products and 0.05-0.2% for thick products. It can be applied to plastic products for packing foods.