Synonym: Tannin, Gallotannic acid
Molecular formula and weight: C76H52O46 = 701.18
CAS registry number: 1401-55-4
Description: Light yellowish to brownish powder, soluble in 1 share Of water or ethanol; Soluble in acetone; Almost insoluble in chloroform or diethyl ether.
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), ≥ : 81.0
Item Qualified product
Loss on drying, %≤ : 9.0
Water insoluble, %≤ : 0.5
Solution color≤ : 3.0
Content(dry weight), ≥ : 78.0
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 25kg 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), %: ≥ 99.5
Chloride, ppm: ≤ 4.4
Pb, ppm: ≤ 2.0
Fe, ppm: ≤ 2.0
Sulfate, ppm: ≤ 3.0
Moisture, % : ≤ 10.0
Use: Additive materials for fine chemistry and electronics field.
Storage: Airproof and protect from light
Packing: Net weight 25kg 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: ≥ 86.0%
Loss on drying: ≤ 9.0%
Water insoluble substance: ≤ 0.60%
Color: ≤ 1.0
Ignited residue: ≤ 0.20%
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: 25KGs/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, %: ≤ 0.002
Loss on drying, %: ≤ 9.0
As, %: ≤ 0.0002
Ignited residue, %: ≤ 1.0
Content, %: ≥ 86
Application: Food and feed additive.
Packaging: 25KGs/drum
