raw materials of Fluorescent brightener Optical Brightening DSD acid

Product Detail

DSD acid (4,4'-Diaminostilbene-2,2'diasulfonic acid) is used in the production of fluorescent brightener, direct frozen yellow G and direct yellow R, and as insecticide Light yellow paste or powder, soluble in ethanol and ether, insoluble in water, easy to dissolve in alkali solution. It is easy to oxidize to red, and it has the properties of aromatic acids and amines DSD acid Specificaiton:

Appearance	Light yellow powder
Purity(%)	≥95.0
Chromaticity	0.12% Max
Alkali insoluble matter	0.08% Max
Ash	2.2% Max
Benzyl compounds	0.25% Max