Product Name: Methylphenyl Dimethoxysilane
Chemical Formula: C9H14O2Si
CAS Number: 3027-21-2
Synonyms: Dimethoxy(methyl)phenylsilane; Phenylmethyl dimethoxysilane
Recommended Use: Intermediate in organic synthesis, used in silicone manufacturing
Manufacturer Details: Refer to supplier information on packaging
Emergency Contact: Refer to local authority or poison control center
Classification: Flammable liquid, Irritant
Hazard Symbols: GHS02 Flame, GHS07 Exclamation Mark
Signal Word: Warning
Hazard Statements: Highly flammable liquid and vapor; causes skin and eye irritation; may cause respiratory tract irritation
Precautionary Statements: Keep away from heat, sparks, open flames; avoid breathing vapors; wear protective gloves and eye/face protection
Routes of Exposure: Inhalation, ingestion, skin or eye contact
Health Effects: Shortness of breath, coughing, redness or pain on skin and eyes
Environmental Effects: Toxic to aquatic life
Methylphenyl Dimethoxysilane: 98-100%
Impurities: Methanol (trace amounts), Phenyl Silane derivatives (trace)
Additives: No significant additives
Common Contaminants: Not expected with proper manufacturing controls
Stabilizing Agents: None known
General Advice: Seek medical attention for persistent symptoms
Inhalation: Move to fresh air, keep warm and at rest, seek medical help if breathing problems develop
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with water for at least 15 minutes
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present, continue rinsing
Ingestion: Rinse mouth, do not induce vomiting, seek immediate medical attention
Delayed Effects: Skin dryness, eye irritation, respiratory issues
Note to Physician: Treat symptomatically, consider chemical pneumonitis in cases of inhalation
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, water spray (do not use direct water jet)
Hazards from Fire: Emits toxic fumes under combustion, including carbon monoxide, carbon dioxide, silicon oxides
Protective Actions: Evacuate area, fight fire from safe location, prevent run-off from entering waterways
Special Protective Equipment: Full protective gear including self-contained breathing apparatus
Special Hazards: Vapors can form explosive mixtures with air, containers can explode if heated
Personal Precautions: Wear proper protective equipment, ventilate area, eliminate ignition sources
Environmental Precautions: Prevent entry into sewers, drains, waterways
Containment: Stop leak if safe, absorb with inert material (e.g., sand, earth), transfer to appropriate container
Clean-up Methods: Pick up mechanically, dispose of absorbed material as hazardous waste
Decontamination: Wash area with water and detergent after initial clean-up
Emergency Procedures: Inform appropriate authorities, restrict access to spill area
Handling: Use only in well-ventilated areas, avoid breathing vapors, avoid contact with eyes and skin, use spark-proof tools, ground containers
Storage: Store in cool, dry, well-ventilated area away from sources of ignition, keep container tightly closed, avoid direct sunlight, segregate from strong oxidizers, acids
Hygiene Measures: Wash hands and exposed areas before breaks, after handling
Other Precautions: Use explosion-proof electrical equipment, keep away from food, drink, and animal feed
Occupational Exposure Limits: No occupational limit value for Methylphenyl Dimethoxysilane established; monitor for methanol if present
Engineering Controls: Use local exhaust ventilation, enclosure of process, explosion-proof ventilation systems
Personal Protection: Safety goggles or face shield, flame-resistant gloves, long sleeves, chemical-resistant apron, closed footwear
Respiratory Protection: Suitable respiratory protection if workplace exposure limit is exceeded or in case of inadequate ventilation
Environmental Controls: Use spill control systems, comply with environmental regulations
Appearance: Clear, colorless to pale yellow liquid
Odor: Light, aromatic
Odor Threshold: Not established
pH: Not applicable
Melting Point: Not determined
Boiling Point: Roughly 210-215°C (409-419°F)
Flash Point: 74°C (165°F) closed cup
Evaporation Rate: Not determined
Flammability (solid, gas): Flammable liquid
Upper/Lower Flammability Limit: Not established
Vapor Pressure: Not readily available
Vapor Density: Heavier than air
Relative Density: 1.02-1.06 (water = 1)
Solubility: Slightly soluble in water, miscible with organic solvents
Partition Coefficient (n-octanol/water): Not determined
Auto-ignition Temperature: Not determined
Decomposition Temperature: Not established
Viscosity: Low, similar to other organosilicon liquids
Chemical Stability: Stable under normal conditions, sensitive to moisture
Possibility of Hazardous Reactions: Reacts with water to form methanol and silanols, violent reaction with strong oxidizing agents
Conditions to Avoid: Moisture, heat, direct sunlight, sources of ignition
Incompatible Materials: Strong acids, strong bases, oxidizers, water (forms methanol on hydrolysis)
Hazardous Decomposition Products: Methanol, silicon oxides, formaldehyde under some conditions
Acute Toxicity - Oral: Low to moderate toxicity; may cause gastrointestinal discomfort
Acute Toxicity - Dermal: Skin irritant; repeated exposure may lead to dermatitis
Acute Toxicity - Inhalation: Vapors can irritate respiratory tract, high concentrations may affect central nervous system
Skin Corrosion/Irritation: Causes irritation, prolonged exposure can result in dryness, cracking
Serious Eye Damage/Irritation: Risk of serious eye irritation, redness, pain
Respiratory or Skin Sensitization: Not expected to cause sensitization, but caution advised
Chronic Toxicity: No long-term studies, treat as potentially hazardous
Other Data: Methanol formation from hydrolysis can create secondary hazards (e.g., blindness, systemic toxicity)
Ecotoxicity: Toxic to aquatic life with long-lasting effects
Persistence and Degradability: Undergoes slow hydrolysis in water; breakdown products persistent in environment
Bioaccumulation Potential: Low; not expected to significantly accumulate in aquatic organisms
Mobility in Soil: Low mobility, but methanol produced from hydrolysis can migrate in soil
Other Adverse Effects: May harm aquatic environments, avoid release to waterways
Waste Treatment Methods: Incineration in suitable facility, use licensed waste disposal contractor
Product Disposal: Avoid disposal in drains, waterways, solid waste; follow local hazardous waste regulations
Contaminated Packaging: Dispose empties as hazardous waste, do not reuse containers
Other Precautions: Rinse containers before recycling if local rules permit; avoid contamination of surface and ground water sources
UN Number: 1993
UN Proper Shipping Name: Flammable Liquid, N.O.S. (Methylphenyl Dimethoxysilane)
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: III
Marine Pollutant: Yes
Special Precautions: Keep container upright, secure during transport, follow national and international transport regulations
Labeling Requirements: Flammable liquid, environmental hazard symbols
Additional Info: Consult shipping company and local regulations prior to transport
OSHA Status: Regulated as hazardous material under OSHA Hazard Communication Standard
TSCA Status: Listed
SARA Title III: Not listed as extremely hazardous, but methanol as contaminant/derivative subject to reporting
REACH Registration: Subject to REACH requirements in European Union
Canadian DSL: Included
Other National Regulations: Covered by local chemical safety regulations, may require workplace exposure monitoring
WHMIS Classification (Canada): B2 (Flammable liquid), D2B (Skin/Eye Irritant)
Labeling Requirements: Follow GHS and national chemical labeling protocols
Restriction on Use: For industrial and laboratory use only; not for food, drug, or cosmetic purposes
