Optical Brightening Agent OB-1 is used widely in the plastic market. Because of its excellent brightening ability,good thermal stability,and compatibility with many polymers. Ms Crystal JINAN SUBANG FINE CHEMICAL CO., LTD Tel:86-531-86330519 Fax:86-531-86330519;81901283 MSN:qian.qian.li@hotmail.com skype:crystalchina33 email:chemicn@hotmail.com QQ:772852201