Product Name: 3-Chloropropyltriethoxysilane
Synonyms: 3-Chloropropyltriethoxy-silane, Silane, (3-chloropropyl)triethoxy-
CAS Number: 5089-70-3
Recommended Use: Organosilane coupling agent for glass and plastics surface treatment, adhesion promoter, crosslinker, functional additive in materials science
Manufacturer Information: Supplier/Importer details available upon request, for chemical emergencies use local poison control contact, and for product inquiries contact quality assurance or regulatory compliance office
Emergency Numbers: Chemtrec, local emergency services, or internal company response team
Classification: Flammable liquid (Category 3), Skin irritation (Category 2), Serious eye irritation (Category 2A), Acute toxicity (Category 4, oral and inhalation), Specific target organ toxicity (single exposure, central nervous system)
Signal Word: Warning
Hazard Statements: Causes skin irritation, causes serious eye irritation, harmful if swallowed or inhaled, flammable liquid and vapor, may cause respiratory irritation
Pictograms: Flame, exclamation mark
Precautionary Statements: Keep away from heat or sources of ignition, wear protective gloves and eye protection, avoid breathing vapors or mists, use only outdoors or in well-ventilated areas, if on skin wash with plenty of soap and water, in case of fire use dry chemical or alcohol-resistant foam
Chemical Name: 3-Chloropropyltriethoxysilane
CAS Number: 5089-70-3
Concentration: Greater than 98% by weight
Impurities: Ethanol (from hydrolysis), less than 1% by weight; traces of hydrochloric acid possible from decomposition under strong hydrolysis
Inhalation: Move person to fresh air, keep comfortable, provide oxygen if breathing becomes difficult, seek medical attention if symptoms do not redissipate
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and running water, seek healthcare intervention for persistent redness or irritation
Eye Contact: Rinse with water for at least 15 minutes while holding eyelids apart, consult emergency medical attention if irritation persists
Ingestion: Rinse mouth, do not induce vomiting, drink water if conscious, consult poison control or emergency medical care immediately
Suitable Extinguishing Agents: Dry chemical, carbon dioxide, alcohol-resistant foam, water spray (fog only, to cool containers)
Special Hazards: Burning produces toxic and corrosive vapors including hydrogen chloride, silicon oxides, carbon oxides; vapors may form explosive mixtures with air
Special Protective Equipment: Firefighters use positive-pressure self-contained breathing apparatus and full chemical protective clothing
Fire Fighting Procedures: Evacuate area, use water spray to cool unopened drums or containers, prevent runoff from entering drains or waterways
Explosion Risk: Vapors heavier than air, may travel along ground and ignite by distant sources
Personal Precautions: Evacuate unprotected personnel, ventilate area, avoid breathing vapor, use appropriate protective equipment including chemical-resistant gloves, goggles, and long-sleeved clothing
Environmental Precautions: Prevent spills from entering sewers, water bodies, or soil, use containment booms and absorbents suitable for solvents
Cleanup Procedures: Absorb liquid with inert material (sand, vermiculite), avoid using materials that react with silanes or chlorine-containing substances, place residue in tightly sealed containers for chemical waste disposal
Handling: Wear chemical-resistant gloves, goggles, protective clothing, ensure adequate ventilation or use local exhaust, avoid sources of ignition, keep away from water and strong acids or bases, avoid repeated or prolonged contact
Storage: Store in a tightly closed original container in a cool, well-ventilated area, segregate from oxidizing materials, acids, and sources of water, store away from food and animal feed, keep from direct sunlight and temperatures exceeding 30°C (86°F)
Occupational Exposure Limit: No specific occupational exposure limit for 3-chloropropyltriethoxysilane; monitor for related compounds such as ethanol and hydrogen chloride
Engineering Controls: Use in a fume hood or with local exhaust ventilation, apply controls to stay below airborne exposure levels for decomposition products
Personal Protective Equipment: Chemical-resistant gloves (nitrile, neoprene), safety goggles, protective apron, flame-resistant lab coat, use respiratory protection if ventilation is inadequate or airborne concentration exceeds recommended limits
Appearance: Colorless to pale yellow transparent liquid
Odor: Faint, pungent, ether-like
Odor Threshold: No data available
pH: Not applicable for neat liquid
Melting Point/Freezing Point: -100°C (typical)
Boiling Point/Range: 217-219°C
Flash Point: 86°C (closed cup)
Evaporation Rate: Slower than ether
Flammability: Flammable liquid
Upper/Lower Explosion Limits: Upper 10%, lower 1.2% (estimated, air)
Vapor Pressure: 0.3 mmHg at 20°C
Vapor Density: Heavier than air
Density: 0.97-0.99 g/cm³ at 25°C
Solubility in Water: Reacts slowly, decomposes
Partition Coefficient (n-octanol/water): Not established
Auto-ignition Temperature: 260°C
Decomposition Temperature: Decomposes above 200°C to give hydrochloric acid and silicon oxides
Viscosity: 2.3 cP at 25°C
Chemical Stability: Stable under normal temperatures and dry, inert conditions
Possibility of Hazardous Reactions: Hydrolyzes in the presence of water to form hydrochloric acid and silicon dioxide; releases flammable ethanol vapor upon hydrolysis; may form corrosive fumes if mixed with acids or bases
Conditions to Avoid: Moisture, humidity, elevated temperatures, open flames, oxidizing agents, acids, and alkalis
Incompatible Materials: Water, alcohols, strong acids and bases, oxidizers
Hazardous Decomposition Products: Hydrogen chloride gas, ethanol, silicon oxides
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Oral LD50 (rat): 1780 mg/kg, Dermal LD50 (rabbit): greater than 2000 mg/kg, Inhalation LC50 (rat, 4h): greater than 5.3 mg/liter
Irritation: Causes skin and eye irritation
Sensitization: Not classified as a skin sensitizer
Systemic Effects: May depress central nervous system; prolonged or repeated exposure can cause defatting of the skin and dermatitis
Carcinogenicity: Not listed by NTP, IARC, or OSHA as a carcinogen
Mutagenicity: Not reported to be mutagenic
Reproductive Toxicity: No conclusive data on reproductive hazards
Ecotoxicity: Acute aquatic toxicity possible due to release of hydrochloric acid and ethanol from hydrolysis, not acutely toxic at low environmental concentrations but chronic effects not well studied
Persistence and Degradability: Not persistent; hydrolyzes rapidly in water to ethanol and silanols that condense to insoluble silica, further hydrolysis yields hydrochloric acid
Bioaccumulation Potential: Not expected to bioaccumulate significantly, ethanol released during hydrolysis is rapidly biodegradable, silanol and silica are environmentally neutral
Mobility in Soil: Strong sorption to soil due to formation of inorganic silica; ethanol component is mobile and may leach into groundwater in high quantities
Other Adverse Effects: Local pH changes may occur where hydrochloric acid is liberated, avoid discharging large quantities into water systems
Waste Treatment Methods: Dispose of following all local, regional and national hazardous waste laws; incinerate at a facility with proper scrubbing for hydrochloric acid emissions, do not pour to drains or water courses
Contaminated Packaging: Triple-rinse containers, puncture and dispose of as hazardous chemical waste, do not reuse empty drums or containers
Additional Measures: Treat rinse water as hazardous waste, consult environmental compliance personnel before disposal
UN Number: UN 1993
Proper Shipping Name: Flammable liquid, n.o.s. (3-Chloropropyltriethoxysilane)
Hazard Class: 3 (Flammable liquid)
Packing Group: III
Environmental Hazards: Substance not classified as marine pollutant
Special Precautions: Keep tightly closed and upright, label properly for road/rail/sea/air transport, documentation must reflect hazard class and emergency measures
OSHA Status: Regulated as hazardous under OSHA Hazard Communication Standard
TSCA: Listed in United States TSCA Inventory
SARA 311/312: Immediate (acute) and delayed (chronic) health hazard, fire hazard
SARA 313: Not reportable under SARA Title III Section 313
EU Regulation: Classified as hazardous under Regulation (EC) No 1272/2008 (CLP/GHS)
Canada WHMIS: Classified as hazardous, flammable and irritant
Other Regulations: State regulations may apply, refer to regional chemical inventory, workplace or environmental laws for limits or reporting requirements
