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Product Name: Tert-Butyl Mercaptan
Chemical Formula: C4H10S
Synonyms: TBM, 2-Methyl-2-propanethiol
CAS Number: 75-66-1
Recommended Use: Odorant for natural gas, chemical intermediate
Supplier: Industrial chemical manufacturers, worldwide distributors
Contact Number: Listed with local regulatory agencies, emergency contact required on facility SDS
Classification: Flammable liquid (Category 2), Acute toxicity (Category 3, inhalation), Skin irritation (Category 2), Eye irritation (Category 2A), Aquatic Acute (Category 2)
Signal Word: Danger
Hazard Statements: Highly flammable liquid and vapor, harmful if swallowed or inhaled, causes skin and serious eye irritation, toxic to aquatic life
Pictograms: Flame, Exclamation Mark, Health Hazard, Environment
Precautionary Statements: Keep away from heat or flames, use only in well-ventilated areas, wear protective equipment, avoid release into environment, wash thoroughly after handling, if swallowed or inhaled seek immediate medical attention, avoid breathing vapors, remove contaminated clothing and wash skin thoroughly, keep container tightly closed
Chemical Name: Tert-Butyl Mercaptan
Concentration: 98-100% by weight
Impurities: May contain trace amounts of other volatile organosulfur compounds, less than 1% unreacted isobutylene or related hydrocarbons
CAS Number: 75-66-1
EC Number: 200-890-8
Inhalation: Remove to fresh air, keep person at rest, contact poison control or emergency medical response if symptoms persist or are severe, provide oxygen if breathing is difficult
Skin Contact: Flush skin immediately with large amounts of water for at least 15 minutes, remove contaminated clothing, wash area with mild soap, do not reuse clothing without thorough cleaning
Eye Contact: Rinse eyes cautiously with water for several minutes, remove contact lenses, seek medical attention if irritation persists
Ingestion: Rinse mouth, do not induce vomiting, seek medical help right away, never give anything by mouth to an unconscious individual
Most Important Symptoms: Nausea, headache, dizziness, respiratory distress, irritation of skin and eyes
Suitable Extinguishing Media: Dry chemical, alcohol-resistant foam, carbon dioxide, water spray to cool containers
Unsuitable Extinguishing Media: Direct water stream can spread the fire
Hazards From Combustion Products: Generates toxic gases including carbon monoxide, carbon dioxide, sulfur oxides, unburned hydrocarbons
Special Protective Equipment: Full protective suit and self-contained breathing apparatus for firefighters
Precautions: Evacuate downwind areas, contain runoff from fire control or dilution to prevent environmental contamination
Personal Precautions: Evacuate area, ventilate in direction of release, do not touch or walk through spilled material, remove possible ignition sources
Protective Equipment: Chemical-resistant gloves, eye protection, vapor mask, impervious apron
Environmental Precautions: Prevent further leakage or spillage, do not allow entry into drains or watercourses, notify authorities if environmental contamination is likely
Cleanup Methods: Absorb with inert material such as sand, collect residue, ventilate and decontaminate area thoroughly, dispose of contaminated materials according to local regulations
Handling: Use only with adequate ventilation, avoid contact with skin and eyes, do not breathe vapor or mist, ground/bond container and receiving equipment, use explosion-proof equipment
Storage: Store tightly closed in a cool, well-ventilated place away from incompatible substances like oxidizers, acids, and heat sources, maintain proper labeling and restricted access, avoid static electricity build-up by grounding containers during transfer, segregate from food and beverages
Occupational Exposure Limits: OSHA PEL: 0.5 ppm TWA, ACGIH TLV: 0.5 ppm TWA, NIOSH REL: 0.5 ppm TWA
Engineering Controls: Local exhaust ventilation, general room ventilation, suitable fume hoods for laboratory use
Personal Protective Equipment: Protective chemical goggles, nitrile gloves, chemical-resistant clothing, flameproof lab coat, respiratory protection in cases of inadequate ventilation or large-scale release
Hygiene Measures: No eating, drinking, or smoking in area of use, wash hands before breaks and after handling
Appearance: Colorless to pale yellow liquid
Odor: Strong, unpleasant, skunk-like
Odor Threshold: Detectable at extremely low concentrations (0.33 ppb)
Molecular Weight: 90.19 g/mol
Boiling Point: 64°C (147°F)
Melting Point: -0.5°C (31°F)
Flash Point: -18°C (0°F) (Closed Cup)
Evaporation Rate: Rapid (compared to butyl acetate)
Vapor Pressure: 250 mmHg at 20°C
Solubility: Slightly soluble in water, miscible with most organic solvents
Density: 0.84 g/cm3 at 20°C
Autoignition Temperature: 464°C (867°F)
Chemical Stability: Stable under recommended storage and handling conditions
Conditions to Avoid: Sources of ignition, heat, open flames, direct sunlight, static discharge
Incompatible Materials: Strong oxidizers, acids, halogens, acid chlorides
Hazardous Decomposition Products: Emits acrid smoke, corrosive sulfur oxides, carbon oxides
Polymerization: Not known to occur under normal circumstances
Acute Toxicity: Inhalation LC50 (rat): 55 mg/m3 (4 h), oral LD50 (rat): 12 mg/kg
Routes of Exposure: Inhalation, skin and eye contact, accidental ingestion
Symptoms: Headache, dizziness, nausea, respiratory tract irritation, CNS depression, unconsciousness at high concentrations
Chronic Effects: Prolonged exposure may cause dermatitis, liver and kidney damage
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, OSHA
Mutagenicity: No evidence found in available studies
Reproductive Toxicity: No adverse reproductive effects observed in limited testing
Toxicity to Aquatic Life: Harmful to fish and aquatic organisms at very low concentrations, acute LC50 (fish) <1 mg/L
Persistence and Degradability: Readily biodegradable in water and soil, but toxic effects may occur before breakdown
Bioaccumulation: Not expected to bioaccumulate significantly in aquatic organisms
Mobility in Soil: High mobility, potential to reach groundwater if released
Other Adverse Effects: Strong odor can affect quality of life and trigger community complaints at trace levels
Disposal Methods: Incinerate in a chemical incinerator equipped with afterburner and scrubber, collect and dispose of waste according to federal, state, and local regulations
Contaminated Packaging: Rinse containers thoroughly before disposal, avoid reuse for any other chemical or food storage
Special Precautions: Do not dispose into surface waters, sewers, or landfill without proper pretreatment and regulatory approval, contact a licensed hazardous waste disposal contractor
UN Number: 2347
UN Proper Shipping Name: Tert-Butyl Mercaptan
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: II
Labels Required: Flammable Liquid, Toxic
Special Provisions: Vent containers to prevent pressure build-up, secure loads to prevent leakage, provide emergency response information with shipment at all times
Regulated Modes: Ground (DOT), Air (IATA), Sea (IMDG)—all require regulatory compliance and emergency contact information
TSCA Status: Listed on the Toxic Substances Control Act Inventory
SARA Title III: Subject to reporting under Sections 302, 304, 311, 312
CERCLA Reportable Quantity: 100 lbs
RCRA Status: Listed hazardous waste, must comply with disposal guidelines
OSHA Classification: Hazardous chemical as defined by 29 CFR 1910.1200
Other Regulations: European REACH registered, subject to local, state, and international safety and environmental regulations, restrictions on occupational exposure and public release apply according to jurisdiction
