CAS:1533-45-5 OB-1 is especially suitable for shaping various kinds of Plastics and their products under high temperature. It has an extra ideal whitening effect on polyester-cotton blend fabric.It can be used for whitening polyester melt.This whitening agent is similar to Whitex SNK,Uvitex ERT and Eastobrite OB-1.Looking for ideal Optical Brightener Manufacturer & supplier ? We have a wide selection at great prices to help you get creative. All the Fluorescent Whitening are quality guaranteed. We are China Origin Factory of Plastive Additive. If you have any question, please feel free to contact us.