Product Name: 3‐Mercaptopropyltriethoxy Silane
Chemical Formula: C9H22O3SiS
Synonyms: MPTES, (3-Mercaptopropyl) triethoxysilane
CAS Number: 14814-09-6
Recommended Use: Coupling agent for improving adherence between organic and inorganic materials, silane surface treatment, crosslinking in plastics and rubber, functionalization of nanoparticles
Manufacturer/Supplier: Refer to product label or invoice for up-to-date vendor information
Emergency Contact: Refer to country-specific support numbers; in the US, CHEMTREC 1-800-424-9300
Classification: Flammable liquid, Skin corrosion/irritation, Eye damage/irritation, Specific target organ toxicity (single exposure)
GHS Label Elements:
Pictogram: Flame, Exclamation Mark, Corrosive
Signal Word: Danger
Hazard Statements: Flammable liquid and vapor, Causes skin irritation, May cause allergic skin reaction, Causes serious eye damage, May cause respiratory irritation, Harmful if swallowed
Precautionary Statements: Keep away from heat/sparks/open flames, Wear protective gloves/eye protection, Avoid breathing vapors, Use only outdoors or in a well-ventilated area, If inhaled: Remove to fresh air and keep at rest
Chemical Name: 3‐Mercaptopropyltriethoxy Silane
CAS Number: 14814-09-6
EC Number: 238-772-4
PURITY: ≥97% by weight
Impurities: Trace amounts of ethanol or other silane-based byproducts
Other Components: Does not contain substances classified as hazardous at levels which require disclosure
Inhalation: Move person to fresh air, keep comfortable, seek medical attention if symptoms persist
Skin Contact: Remove contaminated clothing, wash skin with soap and water, consult a physician if irritation develops or persists
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present and easy, call a specialist if eye irritation continues
Ingestion: Rinse mouth, do not induce vomiting, never give anything by mouth to an unconscious person, seek prompt medical help
Most important symptoms: Irritation or burns at contact sites, coughing, headache, dizziness, nausea
Advice for physician: Treat symptomatically, monitor for respiratory complications, provide supportive care
Suitable Extinguishing Media: Carbon dioxide, dry chemical, foam, alcohol-resistant foam
Unsuitable Extinguishing Media: High pressure water jet, may spread flammable liquid
Hazards from Combustion: Releases toxic gases such as sulfur oxides, carbon oxides, and silicon oxides
Protective Equipment: Firefighters must use self-contained breathing apparatus and full personal protective equipment
Special Precautions: Avoid inhaling vapors or combustion products, keep containers cool by spraying with water if exposed to fire
Explosion Data: Vapors may form explosive mixtures with air, flashback possible; take precautionary measures against static discharge
Personal Precautions: Evacuate unprotected personnel, wear chemically resistant gloves, eye protection, and, if vapors expected, a respirator
Environmental Precautions: Prevent leaks from entering sewers, drains, or waterways, inform authorities if significant spill occurs
Containment Methods: Stop source of spill, seal off area, ventilate enclosed spaces
Cleanup Methods: Absorb with inert material like vermiculite or sand, collect in sealed container for disposal, clean residual area with soap and water, avoid direct contact
Disposal Measures: Place all contaminated wastes in approved waste containers for local hazardous waste disposal
Handling Precautions: Use only in well-ventilated locations, avoid breathing vapors and contact with skin or eyes, keep away from ignition sources, ground/bond containers during transfer
Safe Storage Conditions: Store in tightly sealed original container, cool well-ventilated location, out of direct sunlight, away from incompatible materials such as oxidizers or acids
Incompatibilities: Strong oxidizing agents, acids, alkalis, moisture, heat sources
Special Storage Requirements: Store away from foodstuffs, animal feed, combustibles, and sources of water; ensure storage area has spill containment
Occupational Exposure Limits: No established occupational limits for the substance; exposure should be minimized
Engineering Controls: Use local exhaust ventilation, fume hood or process enclosure, maintain airborne concentrations below detection
Personal Protection Equipment (PPE): Chemical splash goggles, impervious gloves (nitrile or butyl rubber), lab coat or apron, respiratory protection if vapor or mists likely, safety shoes
Hygiene Practices: Do not eat, drink or smoke in work area, wash hands before eating, remove contaminated PPE before leaving work area
Appearance: Clear, colorless to light yellow liquid
Odor: Characteristic, mercaptan-like
Odor threshold: Not determined
pH: Not applicable
Melting Point/Freezing Point: -60°C (approximate)
Boiling Point: 238°C
Flash Point: 95°C (closed cup)
Evaporation Rate: Not available
Flammability: Flammable
Vapor Pressure: 0.12 mm Hg at 25°C
Vapor Density: 6.2 (air = 1)
Relative Density: 1.024–1.044 g/cm³ at 25°C
Solubility: Hydrolyzes in water, soluble in organic solvents
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: 285°C
Decomposition Temperature: Not established
Viscosity: Not measured
Chemical Stability: Stable under recommended storage conditions; decomposes on contact with moisture
Possibility of Hazardous Reactions: Reaction with strong oxidants, water, acids may produce heat, toxic gases
Conditions to Avoid: Exposure to air, moisture, excessive heat, open flames
Incompatible Materials: Strong acids, bases, oxidizing materials, humid environments
Hazardous Decomposition Products: Sulfur oxides, carbon oxides, silicon oxides, hydrogen sulfide, ethylene
Acute Toxicity: LD50 (oral, rat): 2,340 mg/kg; inhalation and dermal toxicity not fully established
Skin Corrosion/Irritation: Causes normal to severe skin irritation; repeated exposure increases risk of allergy
Serious Eye Damage/Irritation: Severe irritant; may cause long-term eye damage
Respiratory Effects: Shortness of breath, coughing, headache, may trigger asthma-like reactions
Sensitization: Prolonged exposure may lead to allergic reactions
Mutagenicity/Carcinogenicity: No evidence found from animal testing to indicate mutagenic or carcinogenic effects
Specific Target Organ Toxicity: May affect respiratory system on prolonged exposure; data limited
Other Information: Symptoms include eye or skin burns, headache, nausea, and respiratory discomfort
Ecotoxicity: Harmful to aquatic life in concentrated spills; long-term effects not fully assessed
Persistence and Biodegradability: Degrades slowly in the environment; may persist if released in large quantities
Bioaccumulative Potential: Low bioaccumulation expected; does not significantly build up in fish or mammals
Mobility in Soil: High mobility due to low molecular weight, potential for water contamination in case of spill
Other Adverse Effects: Breakdown products may contribute to broader environmental contamination if not managed correctly
Waste Treatment Methods: Incinerate at chemical waste facility in compliance with local, regional and national regulations
Contaminated Packaging: Rinse thoroughly; treat as hazardous waste, deliver to authorized disposal facility
Special Precautions: Do not contaminate groundwater, sewers, or public waterways with residues or rinsate
Other Restrictions: Do not landfill bulk quantities or pour down drains; capture and neutralize small residues before disposal
UN Number: UN 1993
UN Proper Shipping Name: Flammable liquid, n.o.s. (3-Mercaptopropyltriethoxysilane)
Transport Hazard Class: 3 (flammable liquid)
Packing Group: III
Marine Pollutant: No classification as marine pollutant
Special Transport Precautions: Keep containers tightly closed, protect from physical damage, ensure upright stowage
US EPA TSCA: Listed 3‐Mercaptopropyltriethoxy Silane on TSCA inventory
EU REACH: Registered, restrictions or authorizations may apply for certain uses
OSHA Hazard Category: Flammable liquid, Skin/Eye Irritant, Acute Toxicant
WHMIS Classification (Canada): Flammable, D2B toxic product, E corrosive
SARA Title III: Not listed as extremely hazardous substance
California Proposition 65: No listed components at reportable levels
Other National Inventories: Compliant in most major jurisdictions, check local requirements
Label Requirements: Must display hazard pictograms and signal words as per GHS; employee training required for safe use
