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           4,4’-Diaminostilbene-2,2’-disulf..
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    Chemical name:4,4’-Diaminostilbene-2,2’-disulfonic acid
    Structural formula: 
      
    Chemical formula: C14H14N2O6S2     
    Molecular weight: 370.4
    CAS NO.:81-11-8
    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)             ≤ 0.12
    (4)Content of alkali insolubles (gross cream )    ≤ 0.08%
    (5)Benzyl compound(gross sample)       ≤ 0.25%
    (6)Ash content                ≤ 2.2%

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