Product description:

Chemical name: 4,4-Diaminostilbene-2,2-disulfonic acid

Trade name: DSD acid
Structural formula:  
               
Chemical formula: C₁₄H₁₄N₂O₆S₂
Molecular weight: 370.4
Property:
1)Light yellow cream or powder, soluble in ethanol and ether; insoluble in water, easily soluble in alkaline solution.
2)Can be easily oxidized into red; has the property of aromatic acid or aromatic amine

Quality index:

Item	Index
(1)Appearance dry/wet	light yellow powder/light yellow cream
(2)Dry product total amino value(gross dry sample)%　　≥	95.0
(3)Degree of pigmentation(EOD)　　　　　　　　　　　　 ≤	0.15
(4)Content of alkali insolubles (gross cream )%　　　≤	0.08
(5)Benzyl compound(gross sample)%　　　　　　　≤	0.25
(6)Ash content%　　　　　　　　　　　　　　　　≤	2.5

2. Main use: In the manufacture of fluorescent brighteming agent、Chrysophenine G and Direct Yellow R, also as pesticides
3. Packing: dry product: in 25kg woven bags or upon clients' request; wet product: in 40kg woven bag or upon clients' request.