الوصف

1. Tech grade:
    Technical data:
     Purity                    %≥*1
     Loss on drying             %≤9
     insoluble in water           %≤0.6
     total color                   ≤2.0
    Usage:main material of gallic acid, , sulfanilamide medicine; extract gallic acid and pyrogallol in chemical industry.mud treater in petroleum drilling; furthermore, it can be used in the production of tan-reagent of leather,polygenetic dye, rubber concretion, albumen reagent, alkaloid precipitator, mill run inhibitor,wine-clarifier,  the germanium extraction, ink confect and so on.

2. Dyestuff grade
Technical data:
Purity                   %≥*1
    Loss on drying            %≤*0
    State in water of solution    below microetch
Light absorption             ≥**0
    content of gallic acid       %≤7
    total color                  ≤1.0
    Usage:In printing dye of textile, it is used as color fixer, polygenetic dye, fiber deodorizer and synthesizingdye.

3. Medicine grade:

 Technical data:
   Purity                  %  ≥*6
    Insoluble in water         %≤ 0.2
    Loss on drying            %≤9
    Clearness of water         up to standard
    Tree gum or dextrin        up to standard
    Residue on ignition         %≤0.2
    Content of gallic acid       %< 7
   Usage:For the preparations of antibiotics, de-tinea, detoxifcation and stoping dysentery and also for synthesizing sulphanilamide synergist.

4. Food grade:

Technical data:
Purity                 %  ≥*2  
Loss on drying          %  ≤9
Residue on ignition     %  ≤0.2
Arsenic               ppm≤3
Heavy metal           ppm≤*0
Tree gum or dextrin test  up to standard
 Resin test             up to standard
 Usage:Mainly used as clarifier of beer, wineandlow-proof vino; also used in food processing of pineapple-proteinase and so on.