Product Name: Methylpropyldiethoxysilane
Chemical Formula: C8H20O2Si
CAS Number: 3069-21-4
Synonyms: Diethoxy(methyl)propylsilane
Use: Intermediate for organosilicon compounds, silane coupling agent
Supplier: Refer to chemical supplier’s details on shipped package
Contact Number: Supplied by product distributor or manufacturer
GHS Classification: Flammable liquids - Category 3; Eye irritation - Category 2A; Specific target organ toxicity (single exposure) – Category 3 (respiratory system)
Hazard Statements: Flammable liquid and vapor; Causes serious eye irritation; May cause respiratory irritation
Pictograms: Flame, exclamation mark
Precautionary Statements: Keep away from sources of ignition; Avoid breathing vapor; Wash hands thoroughly after handling; Moderate eye and respiratory tract hazard
Routes of Exposure: Inhalation, skin contact, eye contact
Symptoms: Irritation to eyes, nose, and throat; headache; dizziness; cough
Chemical Name: Methylpropyldiethoxysilane
Concentration: 98% or greater
Impurities/additives: Trace levels of ethanol, propyl derivatives (below 2%)
CAS Number: 3069-21-4
Molecular Weight: 176.33 g/mol
General advice: Seek medical help if symptoms occur after exposure
Inhalation: Move to fresh air; keep at rest; call a physician for persistent symptoms
Skin contact: Remove contaminated clothing immediately; rinse skin with plenty of water for at least 15 minutes
Eye contact: Rinse cautiously with water for several minutes; remove contact lenses if present; continue rinsing; obtain medical attention promptly
Ingestion: Rinse mouth; do not induce vomiting; never give anything by mouth to an unconscious person; seek medical attention
Suitable extinguishing media: Alcohol-resistant foam, carbon dioxide, dry chemical powder, water spray
Unsuitable extinguishing media: Straight water stream may scatter boiling liquid and spread fire
Hazardous combustion products: Carbon monoxide, carbon dioxide, silicon oxides, incompletely burned hydrocarbons
Advice for firefighters: Wear self-contained breathing apparatus and protective suit; use water spray to cool exposed surfaces; avoid inhalation of fumes
Special hazards: Vapors heavier than air can settle in low areas and ignite; containers can burst under heat
Personal precautions: Evacuate area; remove ignition sources; ventilate area; wear appropriate protective equipment such as gloves, goggles, and respirator
Environmental precautions: Prevent runoff to surface water or storm drains; contain spill with diking materials
Methods for cleanup: Soak up with inert absorbent such as sand or vermiculite; collect for disposal in a suitable chemical waste container; flush area with water after cleanup if local regulations permit
Decontamination: Wash spill site after material pickup is complete
Handling: Use only in well-ventilated areas; ground all equipment containing material; avoid contact with eyes, skin, and clothing
Protection from fire and explosion: Keep away from open flames, hot surfaces, and sources of ignition; prevent static discharge
Storage: Store in tightly closed original containers; store in a cool, well-ventilated, dry area away from incompatible substances such as strong acids or bases, oxidizing agents
Special conditions: Avoid temperatures above 30°C; keep container tightly sealed when not in use; do not store near food, drinks, or animal feed
Occupational exposure limits: No established exposure limit for this compound; monitor for nuisance vapor
Engineering controls: Use explosion-proof equipment; use local exhaust ventilation to keep airborne concentrations low
Personal protective equipment: Chemical splash goggles, chemical-resistant gloves, lab coat or full suit, and appropriate respiratory protection if ventilation is insufficient
Hygiene measures: Wash hands before breaks and at end of work; remove contaminated clothing and wash before reuse
Environmental controls: Use spill prevention measures and containment to minimize environmental release
Appearance: Colorless, clear liquid
Odor: Mild organic, ether-like
Odor threshold: Not available
pH: Not applicable (not soluble in water)
Melting point: Below -70°C
Boiling point: 165-170°C at 760 mmHg
Flash point: 48°C (closed cup)
Evaporation rate: No data available
Flammability (solid/gas): Flammable as a liquid
Upper/lower flammability or explosive limits: 1.2% / 11.4% (estimated)
Vapor pressure: 3 mmHg at 20°C
Vapor density: Greater than air (estimated)
Relative density: 0.84 g/cm³ at 20°C
Water solubility: Reacts slowly with water, not miscible
Partition coefficient (n-octanol/water): Log Kow unknown, expected to partition more to organic phase
Auto-ignition temperature: Around 245°C
Decomposition temperature: Information not available
Viscosity: Less than 5 mPa·s at 20°C
Reactivity: Reacts with water to generate ethanol
Chemical stability: Stable under recommended handling and storage conditions, sensitive to moisture
Possibility of hazardous reactions: Contact with water produces flammable ethanol and silanol; reacts unpredictably with strong oxidizers
Conditions to avoid: Heat, flames, ignition sources, moisture
Incompatible materials: Strong acids, strong bases, strong oxidizing agents, water
Hazardous decomposition products: Ethanol, silicon oxides, carbon oxides, hydrocarbons
Routes of exposure: Inhalation, skin, and eye contact, ingestion
Acute toxicity: Low acute oral toxicity; ingestion may cause gastrointestinal disturbances
Skin corrosion/irritation: Slight to moderate irritation expected; repeated exposure can dry skin and cause cracking
Serious eye damage/eye irritation: Moderately irritating; may cause redness, watering
Respiratory or skin sensitization: Not expected
Specific target organ effects: Respiratory irritation possible at high vapor levels
Chronic toxicity: No long-term studies available; organosilanes generally show low toxicity with proper use
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, or OSHA
Mutagenicity: Not identified as mutagenic
Reproductive toxicity: No adverse reproductive effects known
Ecotoxicity: Harmful to aquatic life at high concentrations; not readily biodegradable
Persistence and degradability: Likely to hydrolyze slowly in water forming silanols and ethanol, which biodegrades
Bioaccumulative potential: Low, based on chemical structure; compound and byproducts unlikely to accumulate in living organisms
Mobility in soil: Low to moderate mobility expected due to low water solubility
Other adverse effects: Avoid uncontrolled release as solvent action can impact aquatic systems and beneficial soil microbes
Product disposal: Burn in a chemical incinerator equipped with afterburner and scrubber; follow local environmental regulations
Contaminated packaging: Triple rinse and offer packaging for recycling or disposal at approved facility
Precautions: Do not dispose in drains, watercourses, or on soil; label containers clearly; comply with health and safety requirements for hazardous chemical waste
UN Number: UN 1993
UN Proper Shipping Name: Flammable liquid, n.o.s. (Methylpropyldiethoxysilane)
Transport hazard class: 3 (Flammable liquid)
Packing group: III
Label: Flammable Liquid
Special precautions: Subject to transport regulations by road (ADR), rail (RID), sea (IMDG), air (IATA); avoid container damage; check local and international rules
Environmental hazards: Not designated as marine pollutant
OSHA: Regulated as hazardous chemical based on flammability
EPA: Covered under TSCA, environmental release control recommended
REACH: If manufactured or imported to the EU, subject to REACH registration
SARA Section 311/312: Classified for fire hazard, acute health hazard
California Proposition 65: Not listed as causing cancer or reproductive toxicity
Other labeling: Workplace labeling must reflect flammability and eye/respiratory hazard
Global Inventory Status: Check each country for local chemical inventory status (e.g., EINECS, DSL, ENCS, AICS)
