Product Name: Benzothiazole-2-thiol
Synonyms: 2-Mercaptobenzothiazole, MBT
Chemical Formula: C7H5NS2
Molecular Weight: 167.25 g/mol
CAS No.: 149-30-4
Recommended Use: Vulcanization accelerator in rubber industries, corrosion inhibitor, chemical intermediate
Supplier Details: Manufacturer contact, address, and emergency telephone number should be accessible from supplier documentation
GHS Classification: Acute toxicity (oral, dermal), Skin sensitiser, Eye irritation, Environmental hazard (aquatic acute and chronic)
Hazard Symbols: Exclamation mark, Dead fish and tree
Signal Word: Warning
Hazard Statements: Harmful if swallowed or in contact with skin. Causes skin and serious eye irritation. May cause allergic skin reaction. Toxic to aquatic organisms with long lasting effects.
Precautionary Statements: Avoid breathing dust or fumes. Wash hands thoroughly after handling. Wear protective gloves, clothing, and eye/face protection. Avoid release to the environment.
Chemical Name: Benzothiazole-2-thiol
Concentration: 98% or higher
Impurities: Traces of isomers or parent benzothiazole compounds (may vary by batch)
Additives: Often none, unless noted in batch information from the supplier
General Advice: Seek medical attention if exposed, especially if symptoms develop or persist.
Inhalation: Move the exposed individual to fresh air. Support breathing if needed. Seek immediate medical attention for difficulty breathing or coughing.
Skin Contact: Remove contaminated clothing and wash skin thoroughly with soap and water. If irritation or rash develops, get medical advice.
Eye Contact: Rinse cautiously with water for at least 15 minutes, lifting eyelids. Remove contact lenses if present and easy to do. Get medical evaluation for persistent redness or pain.
Ingestion: Rinse mouth. Do not induce vomiting. Never administer anything by mouth to an unconscious person. Contact poison center or a doctor without delay.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, alcohol resistant foam. Water spray may be used to cool exposed containers.
Unsuitable Extinguishing Media: Water jet, which can spread the fire.
Hazards from Combustion: Sulfur oxides, nitrogen oxides, carbon monoxide, carbon dioxide, toxic fumes of benzothiazole derivatives.
Protective Equipment: Firefighters need to wear self-contained breathing apparatus and full protective gear to prevent exposure to hazardous decomposition products.
Personal Precautions: Ventilate area. Evacuate unnecessary personnel. Avoid dust formation and inhalation. Wear suitable protective equipment.
Environmental Precautions: Prevent release to soil, drains, and waterways; significant aquatic hazard. Contain the spill to prevent environmental contamination.
Methods for Cleanup: Sweep up and collect in properly labeled, sealed containers for disposal. Avoid dry sweeping to minimize dust. Wash down area with detergent and water after main cleanup.
Handling: Avoid contact with eyes, skin, and clothing. Minimize dust generation and accumulation. Use only in well-ventilated areas. Follow good industrial hygiene practices, including washing hands after handling and before eating, drinking, or smoking.
Storage: Keep in original tightly closed containers. Store in a dry, cool, well-ventilated area, away from sources of ignition and incompatible substances such as strong oxidisers or acids. Protect containers from physical damage. Monitor storage area for any signs of leaks or spills.
Exposure Limits: No specific OSHA PEL or ACGIH TLV, but handle as potentially hazardous. Workplace monitoring may be recommended for dust.
Engineering Controls: Use local exhaust ventilation or process enclosures for dust control. Provide eye wash stations and emergency showers in work areas.
Personal Protective Equipment: Wear chemical splash goggles, nitrile rubber or neoprene gloves, protective clothing, and suitable respiratory protection if airborne dust can’t be controlled. Remove contaminated clothing and wash before reuse. Maintain good hygiene practices.
Appearance: Pale yellow to slightly brown crystalline powder
Odor: Faint, sulfurous
pH (1% solution): Slightly acidic
Melting Point: 178 – 181 °C
Boiling Point: Decomposes before boiling
Solubility: Practically insoluble in water; soluble in alcohol, acetone, hot organic solvents
Density: 1.42 – 1.48 g/cm³
Vapor Pressure: Very low at room temperature
Partition Coefficient (log Kow): 2.1 – 2.5
Flash Point: Not easily flammable
Autoignition Temperature: Data not readily available
Chemical Stability: Stable under normal conditions in original containers.
Incompatible Materials: Strong acids, bases, oxidising agents.
Hazardous Decomposition: Generates toxic gases (SOx, NOx, CO, CO2, mercaptan fumes) on burning or decomposition.
Conditions to Avoid: Excessive heat, open flames, sparks, high humidity, exposure to moisture can lead to product degradation.
Polymerisation: Not known to occur under normal processing or storage conditions.
Acute Toxicity: LD50 Oral (rat) around 1200 mg/kg; LD50 Dermal (rabbit) 2000–5000 mg/kg. Individual sensitivity varies.
Skin Sensitization: May provoke allergic reactions and dermatitis with frequent or repeated exposure.
Eye Effects: Can cause irritation and temporary injury to mucous membranes.
Inhalation Risks: Inhaling dust may cause respiratory irritation, coughing, shortness of breath. Chronic exposure could affect lung function.
Carcinogenicity: Not classified as carcinogen by IARC, NTP, OSHA. Long-term effects have not been fully studied.
Other Data: Some evidence for mutagenicity and effects on reproduction in animal models; precaution advisable for chronic or high exposures.
Aquatic Toxicity: Acute and chronic hazard to aquatic organisms, with LC50 (fish) values in the low mg/L range.
Persistence and Degradability: May not readily degrade in environment; potential for bioaccumulation in aquatic life forms.
Mobility: Not highly mobile in soil but may migrate to groundwater under certain conditions.
Other Effects: Toxic for algae and invertebrates. Long-term exposure in water can disrupt ecosystems.
Waste Treatment Methods: Dispose in accordance with local, regional, and national regulations. Incineration at high temperature in approved facility is best route. Do not release to surface water, sewers, or soil.
Packaging: Containers and packaging should also be disposed as hazardous waste unless thoroughly cleaned.
Precautions: Do not flush to environment. Keep well labeled and secure until collection by licensed hazardous waste handler.
UN Number: UN 3077
Proper Shipping Name: Environmentally hazardous substance, solid, n.o.s. (contains Benzothiazole-2-thiol)
Transport Hazard Class: 9 (miscellaneous dangerous substances)
Packing Group: III
Labels: Marine pollutant, environmental hazard required on outer shipping containers
Special Precautions: Protect from moisture, heat, and rough handling during transport
OSHA Status: Considered hazardous by OSHA Hazard Communication Standard
TSCA Inventory: Listed
EU Classification: Xn (Harmful), N (Dangerous for the environment); R22, R43, R36/38, R51/53
REACH Status: Registered as a substance of very high concern in some uses
Other Regulations: Subject to SARA Title III, California Proposition 65 due to byproduct formation; listed on Canadian DSL/NDSL, Australian AICS, Japanese ENCS
