BP-12 UV-531; 2-hydroxy-4-n-octyloxy-benzophenone Light ... Powder In 25KG Cardboard Drum CAS No.1843-05-6 BP-12Molecular FormulaC21H26O3CAS No.1843-05-6Molecular Weight326.43Other NamesUV-531 ... materials ,improving weatherability and prolonging life of products . UV-531 ( BP-12 )