Profile: Tianjin Zhongmin Science and Technology Development Co.,Ltd. specializes in the development and manufacture of organic photoelectricity materials. Our hole transport materials includes n,n,n',n'-tetra(4-methylphenyl)-1,1'-biphenyl-4,4'-diamine, n,n'-diphenyl-n,n'-di(3-methylphenyl)-1,1'-biphenyl-4,4'-diamine, 2-methyl-4-dibenzylaminobenzoaldehyde-1,1-diphenylhydrazone, 4-bis(4-methylphenyl)aminobenzo-aldehyde-1,1-diphenyl-hydrazone. We offer intermediates of organic functional materials such as 3-methyldiphenylamine, 4-methyldiphenylamine, 4,4'-dimethyldiphenylamine, 3,4-dimethyldiphenylamine, 3,4'-dimethyldiphenylamine, 3,5-dimethyldiphenylamine and 4,4'-dimethyltriphenylamine.