Product Name: Diphenyldimethoxysilane
Chemical Formula: C14H16O2Si
CAS Number: 6843-66-9
Synonyms: Benzene, 1,1'-(dimethoxysilylene)bis-
Recommended Use: Intermediate for organic synthesis, specialty silicone products
Supplier: Chemical manufacturer or distributor contact provided on package
Emergency Telephone Number: Included with shipping documents and label
GHS Classifications: Flammable Liquid (Category 3), Skin Irritation (Category 2), Eye Irritation (Category 2A), Acute Toxicity Oral (Category 4)
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor; Causes skin and eye irritation; Harmful if swallowed
Pictograms: Flame, Exclamation Mark
Precautionary Statements: Keep away from heat/sparks/open flames/hot surfaces; Wear protective gloves and eye/face protection; Do not eat, drink or smoke when using this product
Chemical Name: Diphenyldimethoxysilane
Concentration: ≥97% by weight
Impurities: Trimethylphenylsiloxane < 2%, Water < 1%, Trace organosilicon compounds
Hazardous Components: Main ingredient carries risks described above, impurities generally lower hazard
Inhalation: Move to fresh air. Seek medical attention if symptoms persist, such as headache, dizziness, or respiratory irritation.
Skin Contact: Wash thoroughly with soap and plenty of water. Remove contaminated clothing. Get medical attention if redness, blistering, or irritation develops.
Eye Contact: Rinse cautiously with water for at least 15 minutes, holding the eyelids open. Remove contact lenses if present and easy to do. Immediate medical attention recommended.
Ingestion: Rinse mouth with water. Do not induce vomiting. Seek immediate medical assistance.
Most Important Symptoms/Effects: Irritation of eyes, skin, or airways; nausea or abdominal discomfort if ingested
Suitable Extinguishing Media: Dry chemical powder, foam, carbon dioxide, or alcohol-resistant foam only
Unsuitable Extinguishing Media: Water may spread fire or cause violent reaction
Specific Hazards: Can produce irritating and toxic fumes (silicon oxides, phenol vapors) under fire conditions
Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective gear
Firefighting Instructions: Cool exposed containers with water spray to reduce pressure and prevent rupture; keep away from the area if not involved in the firefighting
Personal Precautions: Evacuate unprotected personnel, ensure ventilation, use appropriate personal protective equipment.
Environmental Precautions: Prevent run-off into surface water, drains, and soil by diking and containing spillage
Cleanup Methods: Absorb spill with inert material (sand, earth, diatomaceous earth), place in chemical waste container for disposal; wash spill area with detergent and water
Special Considerations: Avoid vapor formation; stop leak if safe to do so
Handling: Use in well-ventilated areas; avoid inhalation, ingestion, or contact with skin and eyes; do not use near ignition sources or open flames
Storage Conditions: Store in tightly closed containers in a cool, dry, well-ventilated, and fire-resistant area; keep away from incompatible materials including strong oxidizers, acids, and moisture
Inventory Management: Rotate stock using oldest containers first; clearly label all containers with hazard and content information
Exposure Limits: No established occupational exposure limit for this compound; minimize exposure by controlling vapors and splashes
Engineering Controls: Local exhaust ventilation, eyewash stations, safety showers recommended
Personal Protective Equipment: Wear chemical-resistant gloves (nitrile or neoprene), chemical splash goggles, lab coat or apron, respirator in case of inadequate ventilation
Hygiene Measures: Avoid eating, drinking, or smoking during use; wash hands and face before breaks and after handling
Appearance: Clear, colorless to pale yellow liquid
Odor: Mild aromatic or phenolic
Odor Threshold: Not established
pH: Not applicable (neutral in nature, insoluble in water)
Melting Point: -28°C
Boiling Point: 138-140°C at 10 mmHg
Flash Point: ~75°C (closed cup)
Evaporation Rate: Not available
Flammability: Flammable
Vapor Pressure: 0.4 mmHg at 20°C
Vapor Density: >1 (air = 1)
Relative Density: 1.06 g/cm³ at 25°C
Solubility: Insoluble in water, soluble in most organic solvents (e.g., toluene, ether)
Partition Coefficient (n-octanol/water): No data available
Auto-ignition Temperature: Not determined
Decomposition Temperature: >190°C
Chemical Stability: Stable under standard temperatures and pressures if kept dry
Possible Reactions: Reacts with moisture or humid air to produce salicylic acid and methanol, which are hazardous
Incompatible Materials: Strong acids, strong bases, oxidizing agents, water
Hazardous Polymerization: Does not occur
Hazardous Decomposition Products: Silicon oxides, phenols, carbon oxides, methyl alcohol
Likely Routes of Exposure: Inhalation, dermal contact, ingestion
Acute Toxicity: LD50 (oral, rat): 815 mg/kg; LD50 (dermal, rabbit): not well established
Skin Corrosion/Irritation: May cause moderate skin irritation
Serious Eye Damage/Irritation: Causes moderate to severe eye irritation
Respiratory Effects: Vapors cause nasal and respiratory irritation, headache, drowsiness
Chronic Effects: Repeated or prolonged exposure may cause dermatitis or other skin disturbances
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA
Ecotoxicity: Limited data, similar compounds show moderate aquatic toxicity (fish: EC50 >10 mg/L)
Persistence: Hydrolyzes slowly in moist air or water, producing phenols; not expected to persist in soil or water
Bioaccumulation: Not expected to accumulate significantly in aquatic or terrestrial organisms
Mobility in Soil: Moderately mobile if released, due to partial solubility in organic solvents
Other Adverse Effects: No specific data on ozone depletion or global warming potential
Disposal Methods: Use licensed chemical waste disposal contractor; incinerate in chemical incinerator equipped with afterburner and scrubber
Contaminated Packaging: Decontaminate then dispose in accordance with federal, state, and local environmental regulations
Precautions: Do not flush to sewer or storm water; avoid landfilling liquid chemical waste
UN Number: 1993
Proper Shipping Name: Flammable Liquids, N.O.S. (contains Diphenyldimethoxysilane)
Transport Hazard Classes: Flammable Liquid (Class 3)
Packing Group: III
Transport Labels: Flammable Liquid
Special Precautions: Ship only with properly labeled, tightly-sealed containers; follow all local transport safety regulations
Inventory Status: Listed in TSCA (US), EINECS (EU), DSL (Canada), AICS (Australia), and other global inventories
OSHA Hazards: Flammable Liquid, Irritant
SARA Title III: Not listed under Section 302, 304, or 313
California Proposition 65: Not listed as a chemical known to cause cancer or reproductive toxicity
Other Status: Subject to workplace safety and health regulations; keep current with labeling and safety requirements specific to region
