Product Name: Mixture of N-Propyltriacetoxysilane and Methyltriacetoxysilane
Synonyms: Silane blend, Triacetoxysilane mixed compound
Manufacturer/Supplier: [Supplier Information]
Recommended Use: Used in sealants, adhesives, coatings, and organic synthesis
Contact Details: [Address, Phone, Emergency Contact Numbers]
Product Code: [Internal identification number or code]
Date of Issue: [Date]
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Classification: Skin corrosion (Category 1B), Serious eye damage (Category 1), Specific target organ toxicity (single exposure, respiratory system)
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage; May cause respiratory irritation; Releases acetic acid on hydrolysis resulting in vapors that can irritate mucous membranes
Pictograms: Corrosion, Exclamation mark
Precautionary Statements: Avoid breathing vapors; Wash exposed skin thoroughly; Wear protective gloves, clothing, and eye/face protection; Use only outdoors or in a well-ventilated area; Immediately call a poison center or doctor if you feel unwell
Other Hazards: Hydrolyzes rapidly on contact with moisture in the air, producing acetic acid fumes; Reacts with water to form silicic acid gels that may clog drains
N-Propyltriacetoxysilane: 35%–65% by weight, CAS No. 17865-07-5, Silane compound, hazardous component for skin/eye contact and hydrolysis
Methyltriacetoxysilane: 35%–65% by weight, CAS No. 4253-34-3, Another volatile silane derivative, responsible for acetic acid release and skin/respiratory hazards
Acetic Acid (by hydrolysis): May be generated in small quantities, CAS No. 64-19-7, possible irritant
Impurities: None identified at hazardous concentrations
Inhalation: Move to fresh air. Seek medical attention if symptoms like cough, shortness of breath, or wheezing persist.
Skin Contact: Remove contaminated clothing and flush skin with plenty of lukewarm water for at least 15 minutes. Prompt medical attention is important.
Eye Contact: Rinse cautiously with water for at least 15 minutes, holding eyelids open. Remove contact lenses if present. Get immediate medical help.
Ingestion: Do not induce vomiting. Rinse mouth and drink water if conscious. Obtain medical assistance right away.
Notes for Medical Professionals: Treat based on symptoms; acetic acid vapors may cause airway injury; delayed pulmonary effects may occur; supportive care for corrosive injuries
Suitable Extinguishing Media: Carbon dioxide, foam, dry powder, water spray in fog; avoid using direct water jets due to hydrolysis risk
Specific Hazards: Combustion generates carbon oxides, silicon oxides, and potentially caustic acetic acid fumes
Protective Equipment for Firefighters: Full protective clothing and self-contained breathing apparatus
Advice for Firefighters: Keep containers cool using water spray to prevent vapor expansion or rupture; Control runoff to avoid environmental contamination
Personal Precautions: Wear chemical-resistant gloves, goggles, face shield, and impervious clothing. Remove all sources of ignition.
Environmental Precautions: Prevent entry into sewers, surface water, or soil. Notify authorities in case of large spills.
Containment and Cleanup: Absorb spill with inert material such as sand or earth. Place collected material in tightly sealed plastic containers for disposal.
Decontamination: Clean spill area thoroughly with water after material removal, but avoid excessive water which can promote acetic acid vapor formation.
Ventilation: Provide adequate ventilation in the affected area.
Handling: Use only in well-ventilated areas. Avoid all personal contact, especially with eyes, skin, and respiratory tract. Keep away from moisture and incompatible materials such as strong oxidizers and bases.
Storage Requirements: Store in tightly closed original containers in a cool, dry, and well-ventilated location. Protect from direct sunlight and temperatures above 30°C. Keep containers upright to prevent leaks.
Incompatible Substances: Water, alcohols, alkalis, oxidizing agents
Additional Information: Open containers with care to release any internal pressure; do not reuse empty containers which may contain hazardous traces
Occupational Exposure Limits: Acetic acid: ACGIH TLV 10 ppm (TWA), 15 ppm (STEL); No direct OEL for silanes established
Engineering Controls: Mechanical general and local exhaust ventilation recommended. Implement eyewash stations and safety showers.
Personal Protective Equipment: Chemical goggles or full face shield, chemical-resistant gloves (e.g. butyl, nitrile), impervious clothing, respirators with acid gas cartridge if exposure exceeds safe limits.
Hygiene Measures: Wash hands thoroughly after use. Do not eat, drink, or smoke during use. Launder contaminated clothing separately before reuse.
Appearance: Clear, colorless to slightly yellowish liquid
Odor: Strong, pungent acetic acid odor
pH: Not applicable (hydrolyzes in presence of water)
Melting/Freezing Point: Below -30°C
Boiling Point: 120°C to 160°C (decomposes/hydrolyzes before boiling)
Flash Point: 47°C (closed cup)
Evaporation Rate: Moderate
Vapor Pressure: 2-8 mmHg @ 25°C
Solubility in Water: Reacts with water, forming silicone gels and acetic acid
Vapor Density: >1 (air=1)
Specific Gravity: Approx. 1.0–1.1
Viscosity: Low to moderate
Partition Coefficient: Not determined
Auto-ignition Temperature: Above 250°C
Decomposition Temperature: Not precisely specified; rapid at high temperatures or on contact with moisture
Explosive Properties: Not explosive; acetic acid vapors may form flammable mixtures with air
Oxidizing Properties: Not classified as an oxidizer
Chemical Stability: Stable under recommended handling, storage, and dry conditions
Reactivity: Reacts violently with water, alcohols, and strong bases producing acetic acid and silicone byproducts
Conditions to Avoid: Moisture, humid air, open flames, high temperatures
Incompatible Materials: Water, strong alkalis, acids, and oxidizing agents
Hazardous Decomposition Products: Acetic acid vapors, carbon oxides, silicon dioxide, combustible gases
Polymerization: Not expected under normal conditions
Acute Toxicity: Oral LD50 (rat): N-Propyltriacetoxysilane >2000 mg/kg; Methyltriacetoxysilane 1600 mg/kg
Skin Corrosion/Irritation: Causes burns on contact, may produce delayed symptoms
Serious Eye Damage/Irritation: Severe, irreversible injury possible, risk of blindness
Respiratory Effects: Exposure to vapors may cause burning, coughing, chest tightness
Chronic Toxicity: Repeated exposure may lead to respiratory system injury; no evidence of carcinogenicity from available data
Other Health Effects: No specific organ toxicity known from current data apart from localized corrosive and irritant effects
Aquatic Toxicity: Not acutely toxic to aquatic organisms, but hydrolysis product (acetic acid) may lower pH and affect aquatic life
Persistence and Degradability: Hydrolyzes in water forming acetic acid and silanols; acetic acid readily biodegradable, silanol polymerizes to solid silica
Bioaccumulation Potential: Low; hydrolysis products do not bioaccumulate
Mobility in Soil: Highly mobile until hydrolysis; silica gels formed may remain in soil
Other Ecotoxicological Advice: Avoid uncontrolled release to the environment; follow regional regulations for environmental protection
Waste Treatment Methods: Dispose of in accordance with local, regional, and national regulations, using licensed chemical waste facilities
Contaminated Packaging: Triple rinse containers, puncture and render unusable, dispose as hazardous waste
Disposal Restrictions: Do not allow to enter drains, soil, or surface water
Additional Information: Incineration preferred for liquid residues; never dispose directly in landfills or sewage systems
UN Number: 1993
UN Proper Shipping Name: Flammable liquid, n.o.s. (contains N-Propyltriacetoxysilane and Methyltriacetoxysilane)
Transport Hazard Classes: 3 (Flammable liquid)
Packing Group: III
Labels: Flammable liquid
Environmental Hazards: Not marine pollutant by GHS criteria
Special Precautions: Keep containers upright and tightly closed, segregate from food and incompatible goods during transit
Transport in Bulk: Follow IBC code or other regulatory guidelines for tank transport
Other Information: Emergency response guide: ERG 128; ensure drivers/workers are trained for hazardous materials handling
EU Classification: Corrosive, R34, R37, S26, S36/37/39, S45
US Regulations: Subject to OSHA Hazard Communication Standard (29 CFR 1910.1200); TSCA-listed; SARA Title III Section 311/312 hazards: Acute health, fire
International Inventories: Listed in EINECS/ELINCS, TSCA, ENCS, DSL/NDSL
Labelling Requirements: GHS-compliant hazard and precautionary statements
Other National/Local Laws: Comply with special chemical, storage, and handling regulations in country of use and transportation; workplace exposure standards for acetic acid may be applicable
Restrictions: For professional/industrial use only
