Description

1. Industrial grade 
Main specifications: 

Item First-grade product 
Loss on drying, %≤ : 9.0 
Water insoluble, %≤ : 0.3 
Solution color≤ : 2.0 
Content(dry weight), ≥ : *1.0 

Item Qualified product 
Loss on drying, %≤ : 9.0 
Water insoluble, %≤ : 0.5 
Solution color≤ : 3.0 
Content(dry weight), ≥ : *8.0 

Application: Widely used in extract of Ge, manufacture of "lro ink", anti-corrosion of metal, treatment of slurry in petroleum well, raw materials of pharmaceutical industry. 

Packaging: In plastic woven bags of *5kg net each. 

2. Electronicsl grade 
Characteristic: Light yellowish to light brownish powder, soluble in 1 share of water or ethanol, soluble in acetone, insoluble in chloroform or ethyl ether 
Specification: 
Item   Standard 
Content of Tannic Acid (dry base), %:  ≥ *9.5 
Chloride, ppm:   ≤ 4.4 
Pb, ppm: ≤ 2.0 
Fe, ppm: ≤ 2.0 
Sulfate, ppm: ≤ 3.0 
Moisture, %  : ≤ *0.0 
Use: Additive materials for fine chemistry and electronics field. 
Storage: Airproof and protect from light 
Packing: Net weight *5kg per drum 

3. Pharmaceutical grade 
Characteristic: Light yellowish to light brownish powder, soluble in 1 share of water or ethanol, soluble in acetone, insoluble in chloroform or ethyl ether. 

Main specifications: 
Content of tannic acid: ≥ *6.0% 
Loss on drying: ≤ 9.0% 
Water insoluble substance: ≤ 0.*0% 
Color: ≤ 1.0 
Ignited residue: ≤ 0.*0% 
Gallic acid: ≤ 7.0 

Application: Tannic acid for medicine has the antiseptic, enzyme-eliminating and convergent effects. Applied as antibiotics to treating tinea, eliminating toxic substances and stopping diarrhea etc. 
Packaging: *5KGs/drum. 

4. Food grade 
Characteristic: Light yellowish to light brownish powder, soluble in 1 share of water or ethanol, soluble in acetone, insoluble in chloroform or ethyl ether. 

Main specifications: 
Appearance:  Ivory, no odour 
Heavy metal, %: ≤  0.**2 
Loss on drying, %: ≤ 9.0 
As, %: ≤ 0.***2 
Ignited residue, %: ≤ 1.0 
Content, %: ≥  *6 

Application: Food and feed additive. 
Packaging: *5KGs/drum