Light yellow to light brown amorphous powder or loose glossy flake or sponge like solid that can turn black when exposed to air. Odorless, with a slight special odor, strong astringency, and darkened color when exposed to light and air. Soluble in water, easily soluble in ethanol, acetone, and glycerol, almost insoluble in ether, benzene, chloroform, and petroleum ether.

Product Usage:

1. Used as a clarifying agent and stabilizer for alcoholic beverages in the food industry. It can also be combined with plant fibers to form solidified tannins, which can be used as alcohol filtration absorbents and for iron and decolorization of soy sauce.

2. Use in the leather industry. Tannic acid plays an important role in tanning leather, with good results, and leather does not contain toxic substances.

Tannic acid is used as an effective resistance agent for calcium and magnesium minerals in ore flotation processes.

4. Used in medication.

5. Used in daily chemical products. Such as toothpaste, cosmetics, etc.

6. Printing and dyeing, textile

Product Features:

Appearance:White, light yellow to light brown amorphous powder or loose glossy flake or sponge like solid, gradually darkening in air, with strong hygroscopicity..

Odor:Odorless, with a slight special odor and a strong astringent taste..

Solubility:Soluble in water, ethanol, acetone, almost insoluble in benzene, chloroform, ether, and petroleum ether.. Melting point: 218 ° C, flash point: 187oC.

It exists in the bark and fruit of various trees, such as oak and lacquer trees, and is also the main component of insect fistulas formed by insect invasion in these trees, accounting for 50% to 70%. Also known as tannic acid or tannin. Yellow or brownish yellow amorphous loose powder, gradually darkening in color in air; Has strong hygroscopicity; Easy to dissolve in water, ethanol, and acetone; The taste of the aqueous solution is astringent; Decompose at 210-215C.

Tannic acid is not a single compound, and its chemical composition is relatively complex, roughly divided into two types:

① Condensed tannic acid is a derivative of flavanol, in which the 2-position of flavanol in the molecule binds to catechol or triphenylphenol through a carbon carbon bond;

② It can hydrolyze tannic acid, which has ester bonds in its molecule and is a gallic acid ester of glucose. The latter is the commonly used tannic acid. The chemical composition of tannic acid varies with the source of raw materials. Tannic acid obtained from Chinese galls contains about 12% glucose; Tannic acid obtained from Türkiye gallnut contains about 16.5% glucose. Tannic acid can be used for tanning leather, ink manufacturing, gluing paper and silk, boiler descaling, etc. It can also be used as a mordant, a clarifying agent for beer and wine, a gelling agent for rubber, etc.