Product Name: 2.5-Dioxo-3-Methylthiophene
Chemical Formula: C5H4O2S
Synonyms: 3-Methylthiophene-2,5-dione
CAS Number: 1072-81-7
Manufacturer: [Supplier’s name and contact info]
Recommended Use: Laboratory reagent, intermediate in organic synthesis
Restrictions: For professional use only, not for food or drug applications.
GHS Classification: Acute Toxicity (Oral), Eye Irritation, Skin Irritation
Signal Word: Warning
Hazard Statements: Harmful if swallowed. Irritating to eyes and skin. Possible respiratory tract irritation.
Pictograms: Exclamation mark symbol
Precautionary Statements: Avoid breathing dust/fume. Wear protective gloves/eye protection/clothing.
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Target Organs: Eyes, skin, digestive tract, respiratory system
Substance: Single component
Chemical Identity: 2.5-Dioxo-3-Methylthiophene
Concentration: ≥98%
Impurities: May contain trace solvents or byproducts from manufacturing process, less than 2%
Additives: None reported.
Inhalation: Move exposed person to fresh air, loosen tight clothing. Seek medical attention if symptoms develop.
Skin Contact: Remove contaminated clothing. Wash affected area with soap and plenty of water for at least 15 minutes.
Eye Contact: Rinse with running water for several minutes. Remove contact lenses if present. Continue rinsing and seek medical advice.
Ingestion: Rinse mouth thoroughly. Do not induce vomiting. Seek medical attention if feeling unwell.
Acute Symptoms: Burning sensation, irritation, coughing, nausea.
Suitable Extinguishing Media: Use carbon dioxide, dry chemical powder, or foam. Water spray can be used to cool containers.
Specific Hazards: Combustion produces toxic gases including carbon monoxide, carbon dioxide, and sulfur oxides.
Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective clothing.
Advice for Firefighters: Keep people away from area. Use water spray to cool fire-exposed surfaces. Avoid inhaling fumes.
Personal Precautions: Evacuate unnecessary personnel. Ventilate area. Avoid contact with skin and eyes. Wear gloves and goggles.
Environmental Precautions: Prevent from entering drains, ground water, or soil.
Cleanup Methods: Sweep up and collect spilled material in appropriate waste container. Clean area with water and detergent.
Containment: Stop the leak if possible without risk. Isolate spill area.
Handling Procedures: Maintain proper ventilation during handling. Avoid formation of dust or aerosols. Do not eat, drink, or smoke near material.
Storage Conditions: Keep container tightly closed in a cool, dry, and well-ventilated area. Store away from strong oxidizing agents, acids, and bases.
Storage Incompatibilities: Strong oxidizers, bases, reducing agents, and moisture.
Specific Requirements: Use only in accordance with industrial safety guidelines. Store in original, labeled containers.
Engineering Controls: Local exhaust ventilation or fume hood to minimize exposure.
Personal Protective Equipment: Protective lab coat, safety goggles, chemical-resistant gloves such as nitrile or neoprene.
Respiratory Protection: Dust mask or respirator if dust or aerosol generation is likely.
Hygiene Measures: Wash hands after handling. Remove contaminated clothing before entering eating areas.
Occupational Exposure Limits: No specific workplace exposure limits established for this compound.
Appearance: Pale yellow or beige crystalline powder
Odor: Slight, sulfurous
Odor Threshold: Not determined
Melting Point: About 120–123 °C
Boiling Point: Not readily available; decomposes before boiling
Flash Point: Not available
Flammability: Possibly combustible as fine dust
Solubility: Slightly soluble in water, soluble in organic solvents like ethanol or acetone
Vapor Pressure: Negligible at room temperature
Partition coefficient (log Kow): Not available
pH: Not applicable
Chemical Stability: Stable under recommended storage conditions
Reactivity: Not highly reactive; avoid contact with strong acids or bases
Decomposition Products: Thermal decomposition releases CO, CO2, SOx
Hazardous Reactions: No dangerous reactions known under normal handling and use
Conditions to Avoid: High temperatures, open flames, sources of ignition
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Oral LD50 (rat) data not available; expected to be harmful if swallowed
Skin Corrosion/Irritation: Causes skin irritation on contact
Serious Eye Damage/Irritation: Causes eye irritation
Respiratory Sensitization: Dust or fumes may cause respiratory tract irritation
Chronic Effects: No data available, but prolonged exposure not advised
Carcinogenicity/Mutagenicity/Reproductive Toxicity: No information available for this product
Symptoms: Burning, redness, watering of eyes, coughing, nausea
Aquatic Toxicity: No data available; chemical may cause harm to aquatic organisms if released in significant amounts
Persistence and Degradability: Expected to be partially biodegradable
Bioaccumulation: No reliable data on bioaccumulation potential
Mobility in Soil: Not expected to travel far through soil, due to low solubility
Environmental Precautions: Prevent large quantities from reaching waterways or soil
Waste Treatment Methods: Can be disposed of as hazardous chemical waste in accordance with local, state, and national regulations
Container Disposal: Rinse empty containers with water, label appropriately, and dispose of per hazardous waste protocols
Precautions: Do not reuse containers. Keep solvents and reagents segregated to prevent reactions
UN Number: Not assigned
Proper Shipping Name: Not regulated for transport
Transport Hazard Class: Not classified as dangerous under transport regulations
Packing Group: Not assigned
Special Precautions: Avoid mechanical shocks. Keep tightly capped during transit. If transported with other chemicals, ensure compatibility
Labeling Requirements: Comply with occupational safety regulations in handling and workplace labeling
Inventory Status: Consult each region’s chemical inventory list; no broad restriction under most inventories
Workplace Exposure Guidelines: Standard good practice; no special regulatory exposure limit recommended
Other Regulations: No data on listings for carcinogenic, mutagenic, or reproductive toxicity under the US TSCA, REACH, or other global chemical safety authorities, but all normal safety and environmental laws apply.
