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Product Name: Dodecyl Mercaptan
Chemical Name: 1-Dodecanethiol
Synonyms: Lauryl mercaptan, n-Dodecyl mercaptan
CAS Number: 112-55-0
Recommended Use: Used as a chain transfer agent in the production of polymers, as an intermediate in chemical synthesis, in lubricants, and as an additive for specialty chemicals
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Classification: Flammable liquid (Category 3), Acute Toxicity (Category 4, Inhalation), Skin Irritation (Category 2), Eye Irritation (Category 2B), Specific Target Organ Toxicity – Single Exposure (Category 3, Narcotic effects)
GHS Label Elements: Signal word: Warning; Pictograms: Flame, Exclamation mark
Hazard Statements: Flammable liquid and vapor; Harmful if inhaled; Causes skin irritation; Causes eye irritation; May cause drowsiness or dizziness
Precautionary Statements: Keep away from heat/sparks/open flames/hot surfaces. Avoid breathing vapors. Wear protective gloves/eye protection. Use only outdoors or in a well-ventilated area. Wash thoroughly after handling.
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Potential Health Effects: Headache, nausea, respiratory tract irritation, reddening of skin and eyes, dermatitis with prolonged contact
Environmental Hazards: Toxic to aquatic life with long-lasting effects
Chemical Identity: Dodecyl Mercaptan
CAS Number: 112-55-0
Concentration: ≥ 99%
Impurities: Less than 1% total, includes related mercaptans and sulfides
Additional Components: No significant non-hazard additives or impurities at typical use concentrations
Inhalation: Move person to fresh air. Keep airway clear. Seek medical advice if symptoms persist or if breathing is difficult. Monitor for respiratory distress.
Skin Contact: Remove contaminated clothing. Rinse skin with soap and water for at least 15 minutes. Seek medical attention for persistent irritation. Wash clothing before reuse.
Eye Contact: Flush eyes with water for at least 15 minutes, holding eyelids open. Remove contact lenses. Seek immediate medical attention.
Ingestion: Rinse mouth. Do not induce vomiting without professional guidance. Get immediate medical help. Never give anything by mouth to an unconscious person.
General Advice: Show this safety data sheet to the physician in attendance. Provide symptomatic and supportive therapy.
Suitable Extinguishing Media: Water fog, dry chemical, alcohol-resistant foam, carbon dioxide
Hazards from Combustion: Releases toxic gases including sulfur oxides, carbon oxides, and hydrogen sulfide
Protective Equipment for Firefighters: Self-contained breathing apparatus, full protective clothing
Special Firefighting Instructions: Cool containers with water spray to prevent pressure build-up and possible explosion. Evacuate area and fight fire from safe distance. Remove ignition sources in vicinity.
Flammability: Flammable liquid and vapor; vapors heavier than air, can spread along ground and ignite at distant sources
Personal Precautions: Use personal protective equipment including gloves, protective clothing, and eye/face protection. Remove all sources of ignition. Ventilate area. Avoid direct contact with skin, eyes, and clothing.
Environmental Precautions: Prevent entry into sewers, drains, waterways, and soil. Inform authorities if large quantities enter the environment. Use absorbent materials to contain the spill.
Methods for Cleanup: Stop leak if safe to do so. Absorb small spills using sand, earth, or commercial absorbent. Gather waste in suitable, closed, labeled containers for proper disposal. For large spills, dike area and contain with non-combustible material. Flush remaining area with water after removal. Prevent vapor accumulation.
Precautions for Safe Handling: Handle in well-ventilated areas. Use proper personal protection. Keep away from heat, sparks, open flames. Avoid inhaling vapors. Wash hands thoroughly after use.
Storage Recommendations: Store in tightly closed containers in cool, dry, well-ventilated location. Keep containers away from direct sunlight, incompatible substances, and sources of ignition. Ground all equipment and use explosion-proof fixtures. Store only in original or compatible containers that prevent static buildup.
Incompatibilities: Strong oxidizing agents, acids, alkali metals, peroxides. Segregate from foodstuffs and avoid contact with rubber or plastics which may degrade.
Exposure Limits: Occupational exposure limits may vary by country; consult local regulations. Manufacturer’s recommended exposure limit: 0.5 ppm TWA (manufacturer guideline).
Engineering Controls: Use process enclosures, local exhaust ventilation, or other engineering controls to keep airborne levels below exposure limits.
Personal Protective Equipment: Respiratory protection for vapor, splash-proof chemical safety goggles or face shield, appropriate gloves (neoprene, butyl rubber), and chemical-resistant protective clothing.
Hygiene Measures: Wash hands and exposed skin after handling and before eating or drinking. Remove contaminated clothing. No eating or smoking in work area. Emergency showers and eyewash stations should be readily accessible. Keep workspaces clean to prevent contamination.
Appearance: Clear, colorless to pale yellow liquid
Odor: Strong, offensive, characteristic thiol odor
Odor Threshold: Extremely low, detectable at sub-ppm concentrations
pH: Not applicable (non-aqueous)
Melting Point: -7°C (19.4°F)
Boiling Point: 263°C (505.4°F)
Flash Point: 113°C (235°F), Closed Cup
Evaporation Rate: Slower than butyl acetate
Flammability: Flammable liquid and vapor
Lower/Upper Explosion Limits: 0.8% - 6.5% (v/v)
Vapor Pressure: 0.09 mmHg at 20°C
Vapor Density: 6.5 (air = 1)
Relative Density: 0.86 at 20°C (water = 1)
Solubility: Insoluble in water; soluble in organic solvents (alcohols, hydrocarbons)
Partition Coefficient (n-octanol/water): Log Kow 6.1
Auto-Ignition Temperature: 200°C (392°F)
Decomposition Temperature: Above 150°C (302°F)
Viscosity: 5.3 cP at 20°C
Chemical Stability: Stable under normal conditions when kept away from incompatibles and ignition sources
Conditions to Avoid: Excessive heat, sparks, open flame, exposure to sunlight, static discharge
Incompatible Materials: Strong oxidizers, acids, alkali metals, peroxides, and materials that may promote oxidation or thermal decomposition
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, sulfur oxides, hydrogen sulfide upon combustion or thermal breakdown
Possibility of Hazardous Reactions: No dangerous polymerization anticipated during normal handling; strong acids or oxidizers may lead to violent reactions
Reactives: Avoid contact with copper, brass, or galvanized metal to prevent corrosion and product degradation
Acute Toxicity: Oral LD50 (rat): 2880 mg/kg; Dermal LD50 (rabbit): >2000 mg/kg; Inhalation LC50 (rat, 4h): >2.73 mg/L
Skin Corrosion/Irritation: Causes moderate to severe skin irritation based on animal studies
Eye Damage/Irritation: Causes moderate irritation to eyes, can cause temporary redness and discomfort
Respiratory Sensitization: May cause coughing, throat irritation, and discomfort in exposed workers; unlikely to cause allergic sensitization
Chronic Effects: Repeated or prolonged skin contact may cause dermatitis. Chronic exposure by inhalation could affect nervous system with symptoms such as headache, dizziness, and fatigue
Carcinogenicity: Not classified as a carcinogen by OSHA, IARC, NTP, or EU agencies
Mutagenicity: No evidence from standard tests
Reproductive Toxicity: No evidence from available data
Other Information: Strong odor can cause aversion and discomfort at concentrations lower than those causing acute toxicity
Aquatic Toxicity: Harmful to aquatic organisms; EC50 (Daphnia magna, 48h): 0.96 mg/L; LC50 (Fish, 96h): 1.8 mg/L
Environmental Fate: Volatile and may partition from water to air. Persistent in the environment due to limited biodegradability. Tends to adsorb to sediment or soil due to high log Kow.
Bioaccumulation: Potential for bioaccumulation in aquatic and terrestrial organisms is significant due to high hydrophobicity
Mobility in Soil: Low mobility due to low water solubility and high sorption
PBT/vPvB Assessment: May meet criteria for persistent and bioaccumulative substances
Other Ecological Effects: High odor levels can disrupt local environments. Avoid large releases, particularly into water bodies and soil.
Waste Management: Collect and dispose of waste in accordance with local, state, and federal regulations. Incineration under controlled conditions in a facility with appropriate scrubbers is preferred.
Contaminated Containers: Containers should be triple-rinsed and recycled or disposed of as hazardous waste. Make sure all hazard labels remain intact until final disposal.
Methods of Disposal: Do not dump into sewers, wastewater systems, or the environment. Transfer waste for disposal by qualified professionals.
Regulatory Reporting: Notify relevant authorities of any large accidental releases or disposals. Comply with hazardous waste codes and any special requirements for sulfur-containing chemicals.
UN Number: UN 3334
Proper Shipping Name: Aviation regulated liquid, n.o.s. (contains Dodecyl Mercaptan)
Transport Hazard Class: 9, Miscellaneous Dangerous Goods
Packing Group: III
Labels Required: Miscellaneous Dangerous Goods, marine pollutant if shipped by sea
Marine Pollutant: Yes
Special Precautions: Keep containers upright and secured. Segregate from incompatible materials during transport. Provide proper documentation and emergency information with shipment.
Transport in Bulk: Follows International Bulk Chemical (IBC) code for this substance
US TSCA: Listed on the Toxic Substances Control Act inventory
SARA Title III: SARA 311/312 hazard categories: Immediate, Fire; not reportable under SARA 302/304 Extremely Hazardous Substances or SARA 313
OSHA: Classified as hazardous under OSHA Hazard Communication Standard
EU REACH: Registered; subject to restrictions on manufacture and use in Europe
Canadian DSL: Listed
Other Regional Regulations: Complies with key international requirements for labeling, reporting, and safety management including GHS, ADR, IMDG, IATA
Safety Assessment: Industrial users should conduct periodic risk analysis and maintain written records in accordance with local laws. Follow all occupational safety, health, and environmental laws relevant to the handling and use of this substance.
