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Chemical Name: Tannic Acid
Synonyms: Gallotannin, gallotannic acid, Quercitannic acid
CAS Number: 1401-55-4
Recommended Use: Industrial, laboratory, research, manufacturing
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Emergency Overview: Pale yellow to light brown, odorless or slightly earthy solid; soluble in water; sometimes found as powder, flakes, or granular; reacts with iron salts to form blue-black ink.
GHS Classification: Eye irritation (Category 2A), Skin irritation (Category 2), Acute toxicity (Category 4, oral)
Signal Word: Warning
Hazard Statements: Causes skin irritation, causes serious eye irritation, harmful if swallowed
Precautionary Statements: Wash skin thoroughly after handling, avoid contact with eyes and skin, wear protective gloves and eyewear, do not eat or drink while using this substance
Symptoms of Exposure: Redness, itching, burning in eyes or on skin, digestive upset, pain in mouth or throat if ingested
Tannic Acid: 100%
Chemical Formula: C76H52O46
Impurities or Additives: Product can contain minor traces of moisture depending on storage conditions and batch, but no stabilized ingredients or co-formulated substances typically used
Molecular Weight: 1701.19 g/mol
Inhalation: Move exposed person to fresh air; get medical advice if symptoms such as coughing, difficulty breathing, or irritation develop
Eye Contact: Rinse open eyes gently with lukewarm running water for at least 15 minutes while keeping eyelids apart, remove contact lenses if present and easy to do; seek immediate attention if irritation or pain persists
Skin Contact: Wash affected skin thoroughly using plenty of soap and water; remove contaminated clothing and launder before reuse; call for medical evaluation if irritation continues
Ingestion: Rinse mouth thoroughly, give small amounts of water to drink if the person is conscious and alert, do not induce vomiting unless directed by medical personnel; seek prompt medical help
Suitable Extinguishing Media: Use water spray, foam, dry chemical powder, or carbon dioxide; do not use straight streams of water on burning solid as dust dispersion can occur
Specific Hazards: Product decomposes at high temperatures creating irritating, toxic gases such as carbon monoxide and carbon dioxide
Protective Equipment: Firefighters must wear full protective gear including self-contained breathing apparatus and impermeable gloves
Special Procedures: Keep containers cool by spraying with water; control run-off to avoid environmental contamination
Personal Precautions: Use appropriate personal protection including gloves, goggles, and dust respirator or mask to avoid inhalation and contact
Environmental Precautions: Prevent large spills from reaching drains, soil, or natural waterways; alert local authorities if discharge occurs
Cleanup Procedures: Sweep up material, avoid generating dust, and place in airtight containers for disposal; wash contaminated surfaces thoroughly after collection
Handling: Work in well-ventilated areas; avoid breathing dust; minimize dust generation; handle with protective gloves and glasses
Storage: Keep containers tightly closed in a cool, dry, well-ventilated space; store away from heat, ignition sources, and incompatible substances like strong oxidizers, alkalis, and heavy metal salts
Special Precautions: Do not allow dust to accumulate on surfaces as it could pose an inhalation risk; keep out of reach of children and unauthorized personnel
Exposure Limits: No specific OSHA or ACGIH limits for tannic acid, but work to minimize airborne concentrations, keep below nuisance dust standards (10 mg/m³ for total dust, 3 mg/m³ for respirable fraction)
Engineering Controls: Local exhaust ventilation or process enclosure should reduce airborne dust; use eyewash stations and emergency showers nearby
Personal Protective Equipment: Use chemical-resistant gloves (nitrile or rubber recommended), safety goggles, dust mask or respirator compliant with NIOSH/OSHA standards, lab coat or protective clothing
Hygiene Measures: Wash hands and face after handling, launder clothes frequently, do not eat, drink, or smoke during use
Physical State: Powder, flakes, or granular solid
Color: Pale yellow to light brown
Odor: Slight earthy
pH (1% solution): 2.0 – 4.0
Melting Point: Decomposes
Boiling Point: Not applicable
Solubility in Water: Soluble (at least 285 g/L at 20 °C)
Solubility in Other Solvents: Slight in ethanol; insoluble in ether, chloroform
Vapor Pressure: Not applicable
Density: 0.37–0.80 g/cm³ (bulk)
Flash Point: Not flammable
Evaporation Rate: Not applicable
Partition Coefficient: Not available
Auto-Ignition Temperature: Not determined
Decomposition Temperature: > 210°C
Chemical Stability: Product remains stable during normal handling and storage; sensitive to excess heat, moisture, and light over prolonged periods
Reactivity: Tannic acid can react with strong oxidizing agents, alkalis, and heavy metal salts producing complexes and possibly hazardous gases
Hazardous Decomposition Products: Releases carbon monoxide, carbon dioxide, and organic volatiles on decomposition
Conditions to Avoid: High temperatures, direct sunlight, open flames, incompatible substances as listed above
Polymerization: No known hazardous polymerization expected under prescribed conditions
Acute Toxicity: May be harmful in large quantities if swallowed; oral LD50 (rat) approximately 2,260 mg/kg
Skin Contact: May trigger itching, rashes, or redness in sensitive individuals
Eye Contact: Produces irritation, tearing, and pain if direct contact occurs
Inhalation: Dust can cause mild irritation to respiratory tract; signs may include coughing, sneezing, sore throat
Chronic Effects: Prolonged or repeated exposure by ingestion or skin contact possibly leads to kidney or liver effects based on animal studies; possible sensitizer in rare cases
Carcinogenicity: Not classified as carcinogen by IARC, NTP, ACGIH, or OSHA
Mutagenicity: No substantial evidence for mutagenic risk
Other Health Effects: Interferes with absorption of iron if ingested in excessive amounts
Ecotoxicity: Toxic to aquatic organisms in concentrated forms; high tannin concentrations in wastewater interfere with microbial action and may harm fish
Persistence and Degradability: Undergoes slow biodegradation in soil and water; breakdown accelerates in the presence of UV, heat, and microbial activity
Bioaccumulation: Low potential for bioaccumulation due to high water solubility
Mobility in Soil: Moves readily through soil, especially if released in significant volumes
Other Adverse Effects: High concentrations can affect plant growth and disrupt nutrient cycling
Disposal Methods: Dispose of unused product as non-hazardous organic solid waste according to local, regional, and national regulations; containment and incineration in approved waste facility strongly preferred
Packaging: Contaminated packaging should be emptied completely and can be disposed of with normal waste after thorough rinsing
Environmental Precautions: Prevent large quantities from contacting soil, groundwater, or open water sources during disposal activities
UN Number: Not regulated under current shipping guidelines for land, air, or sea
Transport Hazard Class: Not classified as hazardous
Packing Group: None
Special Transport Precautions: Ship in sealed, labeled packages; avoid moisture during transit; protect from rough handling that could rupture packaging
Inventory Listings: Listed on TSCA (United States), EINECS/ELINCS (European Union), DSL/NDSL (Canada), AICS (Australia), ENCS (Japan), PICCS (Philippines), and other regional chemical inventories
Labeling Requirements: Product labeling requires hazard pictograms and warnings for skin and eye irritation
SARA/Title III: Product not listed as a hazardous chemical under SARA sections 302, 304, 313
California Prop 65: Not listed
Workplace Hazard Communications: Requires training for safe handling, protective equipment, and knowledge of health effects for workers
