Product Name: 3-Mercaptopropyltriethoxysilane
CAS Number: 14814-09-6
Synonyms: Gamma-Mercaptopropyltriethoxysilane, MPTES
Recommended Use: Organosilane for surface modification, coupling agent in adhesives and sealants, precursor for advanced materials
Manufacturer Contact: Emergency telephone details, workplace address, and technical support line included on container label
GHS Classification: Flammable liquid (Category 3), Acute toxicity (oral, dermal, inhalation - Category 4), Skin corrosion/irritation (Category 2), Eye irritation (Category 2A)
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor. Harmful in contact with skin or if inhaled. Causes skin and eye irritation. May cause respiratory discomfort.
Pictograms: Flame, Exclamation mark
Precautionary Statements: Avoid breathing vapors, prevent static discharge, use only with adequate ventilation, keep away from ignition sources
Chemical Name: 3-Mercaptopropyltriethoxysilane
Concentration: ≥98% (commercially typical)
Impurities: Ethanol (<1%) as hydrolysis product, possible traces of related organosilanes
Molecular Formula: C9H22O3SSi
Molecular Weight: 238.42 g/mol
Inhalation: Move person to fresh air. Support breathing as needed. Seek medical attention if symptoms develop.
Skin Contact: Remove contaminated clothing and rinse skin with plenty of running water and mild soap for at least 15 minutes. Medical attention for persistent irritation.
Eye Contact: Hold eyelids open and rinse eyes gently with running water for 15 minutes. Remove contact lenses if present and safe. Medical attention for ongoing irritation or pain.
Ingestion: Rinse mouth with water, do not induce vomiting unless advised by a physician. Medical observation for symptoms including nausea, dizziness, abdominal pain.
Most Important Symptoms/Effects: Throat irritation, coughing, skin redness, eye discomfort, headache, dizziness
Suitable Extinguishing Media: Dry chemical powder, foam, carbon dioxide, alcohol-resistant foam
Unsuitable Extinguishing Media: Water streams may spread fire
Specific Hazards: Vapors may ignite, form explosive vapor-air mixtures in confined spaces. Combustion produces toxic gases, likely silicon oxides, sulfur oxides, carbon monoxide
Protective Equipment for Firefighters: Full protective gear, self-contained breathing apparatus
Fire-Fighting Instructions: Contain run-off. Approach from upwind. Cool containers with water spray to prevent rupture from pressure build-up.
Personal Precautions: Ensure proper ventilation. Remove all ignition sources. Wear chemical splash goggles, impervious gloves, and suitable protective clothing.
Environmental Precautions: Prevent spill from entering drains, waterways, soil. Alert authorities for large releases.
Methods for Clean-Up: Absorb spill with inert material (vermiculite, sand). Place in suitable chemical waste container. Wash area with soapy water after removal. Dispose of waste according to local, state, and federal regulations.
Handling: Use in well-ventilated areas. Open containers carefully to release pressure. Avoid breathing vapor or mist. Prevent contact with skin and eyes using recommended PPE. Ground equipment to prevent static build-up.
Storage: Keep container tightly closed in dry, cool, well-ventilated location. Store away from oxidizers, strong acids, moisture. Protect from heat, sparks, direct sunlight, and static discharge. Use appropriate corrosion-resistant containers (glass, HDPE).
Engineering Controls: Local exhaust ventilation or process enclosure recommended. Emergency eye wash and safety shower accessible in area.
Exposure Limits: No OSHA or ACGIH exposure limits established for this compound. Observe good industrial hygiene.
Personal Protection Equipment (PPE): Nitrile or butyl rubber gloves, chemical splash goggles, long-sleeved lab coat, appropriate respirator if airborne concentrations exceed acceptable limits.
Hygiene Measures: Wash hands and face after use. Remove contaminated clothing before entering common areas. Prohibit food or drink in storage and handling areas.
Appearance: Clear, colorless to pale yellow liquid
Odor: Distinct mercaptan (sulfurous) odor
Odor Threshold: Not determined
pH: Not applicable
Melting Point/Freezing Point: Below -80°C
Boiling Point: About 238°C (460°F) at 760 mmHg
Flash Point: Approximately 96°C (closed cup)
Evaporation Rate: Not available
Flammability: Classified as flammable
Vapor Pressure: Approximately 0.3 mmHg at 25°C
Vapor Density: Greater than one (air = 1)
Relative Density: About 1.00 g/cm³ at 25°C
Solubility: Hydrolyzes in water, slightly soluble
Partition Coefficient (n-octanol/water): Not available
Auto-ignition Temperature: >200°C
Decomposition Temperature: Not established
Viscosity: Not determined
Chemical Stability: Stable under recommended handling and storage. Sensitive to moisture, will hydrolyze and release ethanol.
Hazardous Reactions: May react violently with strong oxidizers and strong acids. Risk of exothermic hydrolysis.
Conditions to Avoid: Excessive heat, moisture, direct sunlight, ignition sources.
Incompatible Materials: Water, strong acids, bases, oxidizing agents.
Hazardous Decomposition Products: Ethanol, sulfur oxides, silicon oxides, carbon oxides, hydrogen sulfide (under combustion)
Likely Routes of Exposure: Inhalation, dermal contact, ingestion, eye contact
Symptoms: Irritation to eyes and skin, redness, cough, respiratory discomfort, headache, dizziness
Acute Toxicity Data: Oral (rat) LD50 estimated over 2,000 mg/kg, dermal (rabbit) LD50 about 4,000 mg/kg
Skin Sensitization: May cause allergic reaction or dermatitis in sensitive individuals
Carcinogenicity: Not recognized as a carcinogen by NTP, IARC or OSHA
Chronic Effects: Prolonged or repeated exposure may cause skin dryness, cracking, and defatting
Other Data: Target organ effects unknown. Avoid repeated exposure.
Ecotoxicity: Limited data available on aquatic toxicity. Expected to have low bioaccumulation due to hydrolysis.
Aquatic Organisms: Can cause adverse effects to fish and aquatic invertebrates if large releases occur.
Degradation: Hydrolyzes rapidly in contact with water, forming silanols and ethanol. Further breakdown to silicon dioxide and organosulfides.
Persistence: Unlikely to persist in environment due to rapid hydrolysis.
Mobility in Soil: Expected limited mobility due to hydrolysis and binding to soil particles.
Other Adverse Effects: No data on ozone, PBT or vPvB properties.
Waste Disposal: Treat as hazardous organic chemical. Incinerate in approved facility with afterburner and scrubber. Avoid landfill disposal. Do not discharge to sewers or waterway.
Contaminated Packaging: Rinse empty containers thoroughly. Dispose as hazardous waste.
Regulatory: Follow national, local, and regional disposal regulations for organic chemicals and organosilanes.
UN Number: UN1993
Proper Shipping Name: Flammable liquid, n.o.s. (contains 3-Mercaptopropyltriethoxysilane)
Hazard Class: 3 (Flammable liquid)
Packing Group: III
Labels Required: Flammable liquid
Special Transport Notes: Keep containers upright and secured. Avoid violent impacts or friction. Check vessel compatibility before shipment.
Environmental Hazards: Not a marine pollutant as per IMDG code
TSCA Status: Listed
REACH Registration: Registered or pre-registered
SARA 311/312: Acute health hazard, fire hazard, reactive hazard due to flammability
California Proposition 65: Not listed
Other Regulations: Subject to workplace safety standards under OSHA (29 CFR 1910.1200), may require environmental reporting under CERCLA or local reporting legislation. Safety Data Sheet must be accessible to all handlers.
