Material Safety Data Sheet – 1-Decanethiol

Identification

Product Name: 1-Decanethiol
Chemical Formula: C10H22S
CAS Number: 143-10-2
Synonyms: n-Decyl mercaptan, Decylthiol
Recommended Uses: Chemical intermediate, lubricant additive, surfactant raw material
Manufacturer Information: Supplier’s name and emergency contact number must appear on the shipment documents and container label
Emergency Phone Number: Refer to supplier-specific numbers for access to 24-hour medical and spill assistance

Hazard Identification

Classification: Flammable liquid, Acute toxicity (oral, dermal, inhalation), Skin corrosion/irritation, Serious eye damage
Label Elements: Signal word: Danger; Pictograms: Flame, Exclamation mark, Environmental hazard
Hazard Statements: Causes skin and eye irritation, toxic if inhaled, harmful in contact with skin, flammable liquid and vapor, harmful to aquatic life with long-lasting effects
Precautionary Statements: Keep away from sparks, hot surfaces, open flames; avoid breathing vapors; wash hands thoroughly after handling; wear protective gloves and eye protection; avoid release to the environment; use only outdoors or in a well-ventilated area

Composition / Information on Ingredients

Chemical Name: 1-Decanethiol
CAS Number: 143-10-2
Concentration: 98% or above by weight
Impurities: Trace aliphatic thiols, hydrocarbons

First Aid Measures

Eye Contact: Rinse cautiously with water for at least 15 minutes. Remove contact lenses if present and easy to do. Seek medical attention for persistent irritation or pain.
Skin Contact: Remove contaminated clothing immediately. Wash skin thoroughly with soap and water. If irritation or redness develops, consult a physician. Do not reuse clothing until properly laundered.
Inhalation: Move affected person to fresh air. Call a physician if symptoms such as headache, dizziness, nausea, or respiratory distress occur. Provide oxygen if breathing is difficult.
Ingestion: Rinse mouth with plenty of water. Do not induce vomiting. Seek immediate medical attention. Never give anything by mouth to an unconscious person.
Notes for Physicians: Treat symptomatically, with attention to airway, breathing, and circulation. Monitor for chemical pneumonitis if inhaled.

Fire-Fighting Measures

Suitable Extinguishing Media: Dry chemical powder, foam, carbon dioxide. Water spray may be used to cool containers.
Unsuitable Extinguishing Media: Direct water jet may spread fire.
Hazardous Combustion Products: Carbon monoxide, carbon dioxide, sulfur oxides, toxic fumes.
Firefighting Instructions: Evacuate area, fight fire from safe distance. Wear self-contained breathing apparatus and full protective clothing. Cool exposed containers with water spray.
Fire/Explosion Hazards: Vapors can travel and ignite at distant sources. Sealed containers may rupture if heated.
Special Protective Equipment: Chemically resistant gear, self-contained breathing apparatus, avoid inhalation of fumes.

Accidental Release Measures

Personal Precautions: Evacuate unnecessary personnel from the area. Ventilate enclosed spaces. Avoid breathing vapors.
Protective Equipment: Impermeable gloves, safety goggles, chemical-resistant clothing, appropriate respiratory protection for high concentrations.
Environmental Precautions: Prevent entry into drains, waterways, or soil. Notify authorities if significant environmental release occurs.
Spill Containment: Stop leak if safe to do so. Contain spill with inert absorbent material such as sand or earth.
Spill Clean-up: Collect absorbed material in suitable container for proper disposal. Wash spill area with water and detergent. Ventilate affected area.

Handling and Storage

Handling: Use only in well-ventilated locations. Avoid all contact with skin, eyes, and clothing. Keep away from static electricity, open flames, and hot surfaces. Do not smoke near handling areas. Avoid inhalation of vapors.
Storage: Store in sealed containers made from compatible materials. Keep containers tightly closed, in a cool, dry, well-ventilated area, away from sources of ignition and incompatible substances such as strong oxidizers. Clearly mark storage areas with appropriate warning signs. Use grounded transfer equipment to prevent static discharge.
Special Requirements: Check containers and equipment regularly for leaks. Avoid storing with food, feed, or drinking water.

Exposure Controls and Personal Protection

Recommended Engineering Controls: Local exhaust ventilation, explosion-proof ventilation systems to limit vapor build-up. Emergency eyewash stations and safety showers should be accessible.
Occupational Exposure Limits: No established OSHA or ACGIH limits for 1-Decanethiol. Maintain exposures as low as possible.
Respiratory Protection: Use NIOSH/MSHA-approved respirators for airborne concentrations above recommended exposure limits, especially in confined spaces.
Skin Protection: Wear butyl rubber or neoprene gloves, full-body coveralls, chemical-resistant boots.
Eye Protection: Chemical splash goggles, face shield for bulk handling.
Hygiene Measures: Wash hands and face thoroughly after handling, avoid eating or drinking in work areas, remove contaminated clothing immediately.

Physical and Chemical Properties

Appearance: Clear, colorless to pale yellow liquid
Odor: Strong, unpleasant, mercaptan-like
Odor Threshold: Low sensory threshold due to sulfur content
pH: Not applicable (non-aqueous)
Melting Point/Freezing Point: -33 °C
Boiling Point and Boiling Range: 230 - 232 °C
Flash Point: 95 °C (open cup)
Evaporation Rate: Slower than ether
Flammability: Flammable liquid and vapor
Explosive Limits: Not readily available, but vapors may form explosive mixtures with air
Vapor Pressure: 0.2 mmHg at 25 °C
Vapor Density: Heavier than air
Relative Density: 0.847 at 25 °C
Solubility: Insoluble in water, miscible with most organic solvents
Partition Coefficient (log Kow): 5.5
Auto-ignition Temperature: 215 °C
Viscosity: 3.6 mPa·s at 25 °C

Stability and Reactivity

Chemical Stability: Stable under recommended storage and handling conditions
Conditions to Avoid: Heat, sparks, flames, static discharge, direct sunlight, and incompatible materials
Incompatible Materials: Strong oxidizing agents, acids, bases, and reducing agents
Hazardous Decomposition Products: Combustion produces sulfur oxides, carbon oxides, and toxic fumes
Possibility of Hazardous Reactions: Reacts with oxidizers, risk of exothermic polymerization or decomposition under severe conditions

Toxicological Information

Routes of Exposure: Absorption through skin, inhalation, ingestion, contact with eyes
Acute Toxicity Data: Oral LD₅₀ (rat) 2610 mg/kg, Dermal LD₅₀ (rabbit) 4200 mg/kg
Skin Corrosion/Irritation: Causes irritation by direct contact
Serious Eye Damage/Irritation: Causes eye irritation and potential corneal injury
Inhalation Toxicity: Vapors cause nose, throat, and respiratory tract irritation, central nervous system effects including headache and dizziness
Chronic Effects: Prolonged or repeated exposure may cause skin sensitization. No known carcinogenic, mutagenic, or reproductive effects in available data
Sensitization: May cause skin sensitivity in some individuals
Other Health Effects: Strong odor may result in transient neurological symptoms including nausea or vomiting at high exposure

Ecological Information

Ecotoxicity: Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment
Persistence and Degradability: Moderately biodegradable under environmental conditions
Bioaccumulative Potential: Significant potential to bioaccumulate in organisms due to high log Kow
Mobility in Soil: Low mobility, will partition to organic material and sediments
Other Adverse Effects: Spills may create foul odors in the environment, impacting community quality of life

Disposal Considerations

Waste Disposal: Dispose only in approved hazardous waste collection facilities. Incineration recommended under controlled conditions.
Contaminated Packaging: Empty containers must be triple rinsed and disposed of as hazardous waste. Do not reuse for new product or consumables.
Special Precautions: Do not allow product or rinse waters to reach sewers, landfills, or watercourses. Seek local, state, or national regulations prior to disposal.

Transport Information

UN Number: 3334
UN Proper Shipping Name: Aviation Regulated Liquid, N.O.S. (contains 1-Decanethiol)
Transport Hazard Classes: Flammable liquid, Class 3
Packing Group: III
Marine Pollutant: Yes
Special Transport Precautions: Follow all regulations for carriage of hazardous materials by land, air, and sea. Label packages with appropriate hazard and precautionary signs. Maintain copies of relevant SDS and emergency contacts with shipments. Inspect containers before loading.

Regulatory Information

TSCA: Listed on the United States Toxic Substances Control Act inventory
ECHA (REACH): Registered under European Chemical Agency requirements
SARA Title III: This material does not contain any components listed as Extremely Hazardous Substances
California Proposition 65: Not listed
Canada WHMIS Classification: B2 (Flammable liquid), D2B (Toxic/irritant)
Other Regulatory Listings: Refer to local, national, and regional regulations for workplace safety, transport, labeling, and environmental protection requirements involving this chemical. Retain and share SDS records in accordance with occupational health laws.