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Product Name: Usnic Acid
Chemical Name: 2,6-Diacetyl-7,9-dihydroxy-8,9b-dimethyldibenzofuran-1,3(2H,9bH)-dione
Synonyms: Usnew Acid, Usninic Acid
CAS Number: 125-46-2
Manufacturer: Chemical suppliers and research companies
Recommended Use: Laboratory research, biocidal agent, antifungal compound
Emergency Contact: Local poison control center or emergency services
GHS Classification: Acute toxicity (Oral, Dermal, Inhalation), Skin Sensitizer Category 1
Pictograms: Exclamation mark, health hazard
Signal Word: Warning
Hazard Statements: May cause skin irritation, may cause eye irritation, harmful if swallowed or inhaled, possible allergic skin reaction
Precautionary Statements: Avoid inhalation, use protective gloves, thoroughly wash hands after handling, avoid contact with eyes and skin
Chemical Name: Usnic Acid
Concentration: >95% pure
CAS Number: 125-46-2
Impurities: Minor amounts of natural lichen metabolites
Inhalation: Move to fresh air, seek medical attention if symptoms develop
Skin Contact: Remove contaminated clothing, wash skin with soap and plenty of water for at least 15 minutes, consult a medical professional if irritation occurs
Eye Contact: Rinse cautiously with water for at least 15 minutes, remove contact lenses if present, continue rinsing, get medical help
Ingestion: Do not induce vomiting, rinse mouth, seek immediate medical advice
Most Important Symptoms: Cough, irritation, skin rash, redness, allergic reactions
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Unsuitable Extinguishing Media: High-pressure water jet
Hazards from Combustion: Releases toxic fumes such as carbon monoxide, carbon dioxide, organic vapors
Protective Equipment: Firefighters wear self-contained breathing apparatus and full protective gear
Special Precautions: Move containers away from fire zone, prevent runoff from entering waterways
Personal Precautions: Evacuate unnecessary personnel, ventilate area, avoid breathing dust, wear gloves, eye protection, and dust mask
Spill Cleanup: Sweep up carefully and place into closed container, avoid creating dust, wipe area clean with damp cloth
Environmental Precautions: Prevent material from entering drains, surface water, or soil
Disposal of Contaminated Material: Dispose of according to local regulations, label waste with proper chemical name
Safe Handling: Avoid contact with skin, mucous membranes, and eyes, use in a well-ventilated place, minimize dust generation
Hygiene Measures: Do not eat, drink, or smoke during use, wash hands thoroughly after handling
Storage Conditions: Store in a tightly closed, labeled container, in a cool, dry, and well-ventilated place, protect from light
Incompatible Materials: Strong oxidizing agents, acids, alkalis
Packaging Materials: Glass or chemical-resistant plastic containers
Exposure Limits: No established occupational exposure limit values
Engineering Controls: Use local exhaust or general laboratory ventilation
Personal Protective Equipment: Chemical-resistant gloves, safety goggles, lab coat
Respiratory Protection: Dust mask or respirator if dust is generated
Skin Protection: Protective clothing to prevent skin contact
Eye Protection: Chemical splash goggles
Appearance: Pale yellow crystalline powder
Odor: Odorless
Molecular Formula: C18H16O7
Molecular Weight: 344.32 g/mol
pH: 5.5–6.5 (saturated solution)
Melting Point: 203–205°C
Solubility: Sparingly soluble in water, soluble in ethanol, acetone, ether
Boiling Point: Not applicable (decomposes)
Vapor Pressure: Not available
Flash Point: Not available
Density: 1.5–1.6 g/cm³
Chemical Stability: Stable under normal conditions of storage and handling
Reactivity: Not reactive under recommended conditions
Hazardous Reactions: None known under normal use
Incompatible Materials: Strong oxidizing agents, strong acids, bases
Decomposition Products: Carbon monoxide, carbon dioxide, organic fumes
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: LD50 (oral, rat) reported between 80–350 mg/kg
Skin Irritation: May cause mild to moderate irritation
Eye Irritation: May cause irritation on direct contact
Sensitization: Can provoke allergic reactions in sensitized individuals
Chronic Effects: Limited data suggest repeated exposure may affect liver function
Carcinogenicity: No information on carcinogenicity in humans
Other Effects: Not enough data available for reproductive toxicity or mutagenicity
Ecotoxicity: Toxic to aquatic life, especially algae and lower aquatic organisms
Persistence and Degradability: Biodegradation occurs slowly in the environment
Bioaccumulative Potential: Potential for accumulation in aquatic organisms
Mobility in Soil: Low mobility, tends to adsorb to organic matter
Other Adverse Effects: Can disrupt aquatic habitats at higher concentrations
Waste Treatment Methods: Dispose of unused product and contaminated materials as hazardous chemical waste
Disposal Containers: Use sealed, labeled containers compatible with the chemical
Disposal Precautions: Never dispose of via sink, drain, or regular trash
Regulatory Disposal: Comply with local, regional, and national guidelines on hazardous waste disposal
Unused Material: Store for professional chemical waste pickup
UN Number: Not regulated for transport
Proper Shipping Name: Usnic Acid
Transport Hazard Class: Not classified as dangerous goods
Packing Group: None
Marine Pollutant: May be harmful to aquatic life
Special Precautions: Protect from physical damage, transport in sealed containers
OSHA Status: Not specifically regulated
TSCA Status: Listed on the Toxic Substances Control Act Inventory
REACH Status: Subject to European REACH regulations
SARA Title III Sections 302/313: Not listed
WHMIS (Canada): Not controlled product
Labeling Requirements: Proper hazard warning labels, precautionary statements
Other Regulations: Compliance with environmental, fire, and chemical storage codes required by local authorities
