Tannic Acid - Acidum tannicum - Gallotannic acid - Digallic acid - Gallotannin - Tannimum - - 100g

Tannic Acid Pure
Other Names: Acidum tannicum, Gallotannic acid, Digallic acid, Gallotannin, Tannimum, Quercitannin, Oak bark tannin, Quercotannic acid

CAS Number: 1401-55-4
Chemical Formula: C₇₆H₅₂O₄₆
Molar Mass: 1701.29 g/mol
Appearance: Yellowish to light brown powder

Tannic acid is a naturally occurring polyphenolic compound derived from plant sources such as oak, chestnut, and sumac. It is a member of the tannin family, known for its ability to complex with proteins and metal ions. It is water- and alcohol-soluble and has astringent, reactive properties that make it useful in a variety of industrial and laboratory contexts.

Chemical and Physical Properties

Density: ~1.5 g/cm³ (estimated)
Melting Point: ~210°C (decomposes)
Boiling Point: Not applicable (decomposes before boiling)
Solubility in Water: Soluble
Solubility in Other Solvents: Soluble in ethanol; limited solubility in non-polar solvents
Odor: Odorless or slightly phenolic

Applications

Leather Industry: Used as a tanning agent, reacting with collagen in hides to increase durability, flexibility, and resistance to decay.

Textile Industry: Serves as a mordant and fixative in dyeing processes.

Ink Manufacturing: Essential component in traditional iron gall inks, reacting with metal salts to form stable, dark pigments.

Chemical Processing: Employed in precipitation reactions, protein assays, and metal ion binding studies.

Laboratory Use: Investigated for its antioxidant behavior and its role as a polyphenolic reference compound.

Safety

Signal Word: Warning

Hazard Statements:

H319: Causes serious eye irritation

Precautionary Statements:
P305+P351+P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing
P337+P313: If eye irritation persists: Get medical advice/attention

First Aid Measures

Eye Contact: Rinse with water for several minutes. Seek medical attention if irritation continues.
Skin Contact: Wash affected area with soap and water. Remove contaminated clothing.
Inhalation: Move to fresh air. If symptoms occur, seek medical advice.
Ingestion: Rinse mouth. Do not induce vomiting. Seek medical help if large quantities are ingested or if symptoms appear.

Handling and Storage

Storage Conditions: Store in a tightly closed container in a dry, cool, and well-ventilated area. Protect from moisture and light.
Handling Precautions: Avoid creating dust and inhaling particles. Use suitable personal protective equipment when handling larger quantities.