Product Name: Chloropropylsilane Oligomer
Chemical Family: Organosilicon Compound
Synonyms: Chloropropyl-functionalized siloxane oligomer
Recommended Use: Industrial intermediate for silicone resin, rubber, and coating production
Supplier: Refer to shipping documentation for manufacturing contact information
EMERGENCY PHONE: Chemtrec: 1-800-424-9300 (USA)
CAS Number: Mixture (components typically include 3-chloropropyltrimethoxysilane oligomers)
Classification: Flammable liquid and vapor; causes skin and eye irritation; harmful by inhalation, ingestion and skin absorption
Hazard Statements: Causes serious eye and skin irritation; causes respiratory tract irritation; may cause allergic skin reaction; harmful to aquatic life
Pictograms: Flame, exclamation mark, health hazard
Signal Word: Danger
Precautionary Statements: Avoid contact with skin and eyes, avoid breathing vapors or spray mist, keep away from ignition sources, use only with adequate ventilation
Routes of Exposure: Inhalation, skin absorption, eye contact, ingestion
Target Organs: Skin, eyes, respiratory tract
Main Component: Oligomeric chloropropylsiloxane
Approximate Concentration: 85 – 100% by weight
Other Ingredients: Residual monomeric 3-chloropropyltrimethoxysilane 1–10%, trace methanol from hydrolysis
Impurities: Trace amounts of hydrochloric acid from manufacturing process
Chemical Formula: [–(CH2)3Si(CH3O)xO–]n with chlorine substituent
Molecular Weight: Varies depending on oligomer length
CAS Numbers for Components: 2530-87-2 (3-chloropropyltrimethoxysilane)
Inhalation: Remove affected person to fresh air, keep at rest, provide oxygen if necessary, contact physician if symptoms persist
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water for at least 15 minutes, do not reuse clothing until laundered
Eye Contact: Flush with plenty of water for several minutes, lifting upper and lower eyelids occasionally, seek medical attention
Ingestion: Rinse mouth, do not induce vomiting, never give anything by mouth to an unconscious person, seek immediate medical advice
Most Important Symptoms and Effects: Burning sensation, severe irritation to respiratory system, chemical burns to eyes and skin
Medical Attention/Special Treatment: Chemical splash injuries require prompt medical attention; monitor for respiratory distress
Suitable Extinguishing Media: Dry chemical powder, foam, carbon dioxide; water spray for large fires
Unsuitable Media: Avoid direct water jet—may spread fire or cause hydrolysis releasing flammable vapors
Specific Hazards: Flammable vapors form above flash point, may form explosive mixtures with air; combustion produces hydrogen chloride, carbon oxides, silicon dioxide
Special Protective Equipment: Self-contained breathing apparatus, full protective gear, chemical-resistant boots and gloves
Firefighter Precautions: Approach upwind, cool containers with water spray, contain run-off to prevent entry into drains or water courses
Hazardous Decomposition Products: Hydrogen chloride fumes, silicon oxides, carbon monoxide, carbon dioxide
Personal Precautions: Evacuate unprotected personnel, ventilate spill area, eliminate ignition sources, use suitable respiratory protection
Protective Equipment: Chemical splash goggles, impervious gloves, chemically resistant apron, positive pressure respirator for large spills
Environmental Precautions: Prevent entry into drains, surface water or soil; report to authorities if product has caused environmental contamination
Cleanup Methods: Absorb on vermiculite, dry sand, or inert absorbent; shovel into suitable container for disposal; do not use combustible materials for absorption
Decontamination: Wash area with copious amounts of water and detergent; avoid secondary contamination
Disposal of Collected Material: Dispose of in accordance with local regulations as hazardous waste
Handling: Use only in well-ventilated areas, avoid splashing, use spark-proof tools and explosion-proof equipment, keep away from heat, sparks and open flame
Hygiene Practices: Wash thoroughly after handling, do not eat, drink, or smoke in work area, remove contaminated clothing promptly
Storage: Store tightly closed in a cool, dry, well-ventilated place away from moisture and incompatible substances; keep containers locked and clearly labeled; inert gas blanket recommended for bulk storage
Incompatible Materials: Strong oxidizers, acids, alkalis, water (hydrolyzes and releases HCl gas)
Packaging Materials: Stainless steel, lined steel or approved plastics recommended; avoid copper, brass, and their alloys
Engineering Controls: Local exhaust ventilation, process enclosure, fume hood or similar engineering controls to keep airborne levels below recommended exposure limits
Occupational Exposure Limit: No established OSHA limit for this mixture; treat as hazardous based on component toxicity
Respiratory Protection: Use NIOSH-approved respirators with organic vapor/acid gas cartridges when exposure limits may be exceeded
Eye Protection: Chemical safety goggles, face shield for large volume handling
Skin Protection: Impervious gloves (nitrile, neoprene), long sleeves, chemical-resistant clothing
Environmental Controls: Prevent release into environment; use spill control and containment systems, monitor emissions if necessary
Workplace Practices: Routine monitoring, emergency eyewash and safety shower required in area of use
Appearance: Colorless to pale yellow clear liquid
Odor: Pungent, ether-like, possibly hydrochloric
Odor Threshold: Not available
pH: Not applicable (hydrolyzes in water)
Melting Point/Freezing Point: Below 0°C
Boiling Point/Range: 180 – 230°C (varies by oligomer length)
Flash Point: Approx. 70°C (Closed cup)
Evaporation Rate: Not determined
Flammability (solid, gas): Not applicable
Flammability Limits: LEL: 1.4%; UEL: 10% (estimated)
Vapor Pressure: Low, increases with temperature
Vapor Density: Heavier than air
Relative Density: 1.0 – 1.2 (Water = 1)
Solubility: Hydrolizes on contact with water; immiscible in water, soluble in organic solvents
Partition Coefficient: Not determined
Auto-Ignition Temperature: Above 300°C
Decomposition Temperature: Starts to decompose above 150°C
Viscosity: Variable, dependent on degree of polymerization
Chemical Stability: Stable under recommended storage conditions, sensitive to moisture, hydrolyzes slowly forming HCl and siloxanols
Reactive Hazard: Hydrolyzes in presence of water/moisture liberating corrosive and toxic hydrogen chloride gas
Reactivity Profile: Reacts violently with acids, strong oxidizers, strong bases; can react with alcohols or amines to form other silicates
Conditions to Avoid: Heat, flame, sparks, moisture, contact with incompatible materials
Hazardous Decomposition Products: Hydrogen chloride, silicon oxides, hydrochloric acid vapor, organochlorine byproducts
Polymerization: Uncontrolled polymerization unlikely under normal conditions, may occur in presence of water
Routes of Entry: Inhalation, eye contact, skin contact, ingestion
Acute Effects: Causes severe irritation of mucous membranes, eyes and skin; inhaled vapors can cause coughing, headache, dizziness, shortness of breath
Chronic Effects: Prolonged or repeated exposure may cause dermatitis, sensitization, lung effects
LD50 (oral, rat): >2000 mg/kg (estimated based on similar silanes)
LD50 (dermal, rabbit): >2000 mg/kg (estimated, based on similar compounds)
LC50 (inhalation, rat): Not precisely established, moderately toxic based on available data
Skin Irritation: Severe
Eye Irritation: Severe
Respiratory Sensitization: May cause
Mutagenicity: Not classified
Carcinogenicity: Not classified as human carcinogen by IARC, NTP, OSHA
Reproductive Toxicity: No significant effects known
Aspiration Hazard: May cause chemical pneumonitis if aspirated
Aquatic Toxicity: Harmful to aquatic organisms; prevents normal gas exchange in water by forming siloxane films; potential to cause long-term adverse effects in aquatic environment
Persistence and Degradability: Slowly hydrolyzes in environmental conditions to siloxanes and hydrochloric acid
Bioaccumulative Potential: Low to moderate; large molecules not expected to bioaccumulate, monomers may accumulate
Mobility in Soil: High initially, becomes immobile after siloxane formation
Other Effects: Hydrolysis products may alter pH and damage sensitive organisms
Environmental Precautions: Prevent release to soil, waterways, or sewers; recover spill for disposal
Disposal Methods: Incinerate under controlled conditions in compliance with local, state and federal environmental regulations; avoid disposal to sewer, soil, or natural waterways
Container Disposal: Triple rinse empty containers, puncture to prevent reuse, dispose of as hazardous waste
Recommended Codes: Suitable code from European Waste Catalogue or US EPA hazardous waste listings
Precautions: Do not mix with incompatible chemicals; assure waste treatment plant is equipped to handle organosilanes
UN Number: UN 1993
Proper Shipping Name: Flammable liquid, n.o.s. (contains chloropropylsilane oligomer)
Hazard Class: 3 (Flammable liquid)
Packing Group: II
Labels Required: Flammable liquid
Special Provisions: Keep away from heat, strong acids, bases, and moisture
Transport in Bulk: Refer to IMO requirements and bulk handling guidance
EmS Code: F-E, S-E (for marine transport)
Additional Information: Emergency response guidance available in ERG Guide 128 (Flammable Liquids)
TSCA: Listed as chemical substance under US TSCA Inventory
EINECS: Listed (in oligomeric and monomeric components)
REACH Registration: Required for manufacture/import to EU above 1 tonne/year
SARA 302/304: Not listed as extremely hazardous substance
SARA 311/312: Immediate health, delayed health, fire hazard categories
SARA 313: Not subject to reporting
California Proposition 65: No listed chemicals
Canadian DSL/NDSL: Components listed on DSL
WHMIS Classification: B2 (Flammable liquid); D2B (Toxic material causing other effects)
Other National Inventory Listings: Consult local regulations for additional requirements involving import, use, and disposal
