Beijing FLY Science and Technology Development Co., Ltd.
In the world, We are one of the largest manufacturers of fluorescent brightener SWN (C.I.140), Fluorescent Brightener 199 series (ER-330, EB-330), fluorescence brightener 4BK and cyano-benzaldehyde chemical intermediates (o-cyano-benzaldehyde CAS :7468-67-9, m-cyano-benzaldehyde CAS :24964-64-5, p- cyano-benzaldehyde CAS: 105 -- 07-7), and 7 - hydroxy -4 ?methyl-coumarin (CAS :90-33-5).