Product Name: Diphenyldiethoxysilane
Chemical Formula: C16H20O2Si
Synonyms: Diethoxy(diphenyl)silane
CAS Number: 2553-73-9
Recommended Use: Used as an intermediate in organic synthesis, primarily in the manufacturing of silicone products, adhesives, and coatings.
Supplier Name: Information provided upon request
Emergency Phone: Manufacturer or local emergency services
Restrictions: Industrial use only, not for food, drug, or household applications.
Classification: Flammable liquid, Eye irritation, Specific target organ toxicity
Label Elements: Flammable pictogram, exclamation mark
Hazard Statements: May cause irritation to eyes, skin, and respiratory tract. Vapors may cause drowsiness. Flammable liquid and vapor.
Precautionary Statements: Keep away from heat sources, do not breathe vapor or mist, wash skin thoroughly after handling, avoid contact with eyes and skin.
Routes of Exposure: Inhalation, skin contact, ingestion, eye contact
Target Organs: Central nervous system, eyes, skin
Signs and Symptoms: Burning sensation, redness, coughing, headache, dizziness.
Chemical Name: Diphenyldiethoxysilane
CAS Number: 2553-73-9
Purity: >98%
Impurities: Ethanol <1%, unreacted silane derivatives <1%
Stabilizers/Contaminants: None reported for standard grades
Mixture: Single component material
Inhalation: Remove person to fresh air, provide oxygen if breathing is difficult, seek medical attention if symptoms develop.
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, get medical support if irritation persists.
Eye Contact: Rinse eyes cautiously with water for at least 15 minutes, lift eyelids occasionally, obtain medical attention for persistent discomfort.
Ingestion: Do not induce vomiting, rinse mouth with water if conscious, seek immediate medical attention, provide material label to physician.
Note to Physician: Treat symptomatically, no specific antidote known.
Suitable Extinguishing Media: Use alcohol-resistant foam, dry chemical powder, carbon dioxide, water spray (for cooling, not direct jet).
Unsuitable Media: Do not use water stream for extinguishing fire as it may cause splattering.
Specific Hazards: Vapors may form explosive mixtures with air, combustion can release irritating fumes, such as carbon monoxide, carbon dioxide, and silicon oxides.
Protective Equipment: Firefighters should wear self-contained breathing apparatus and chemical protective clothing to prevent contact with skin and eyes.
Firefighting Instructions: Evacuate area, stay upwind, use water spray for cooling containers exposed to flame, contain run-off to prevent entry into waterways.
Personal Precautions: Wear appropriate protective equipment: gloves, eye protection, and respirator where risk of airborne vapors exists. Maintain adequate ventilation.
Environmental Precautions: Prevent product from entering drains, surface and groundwater. Notify authorities if spill enters public waters.
Clean Up Methods: Contain spill with non-combustible absorbent materials such as sand or earth, scoop into clean containers for disposal, wash area with detergent and water to remove residue.
Other Advice: Avoid sources of ignition, ventilate area after cleanup, dispose of contaminated material according to local regulations.
Handling: Use only in well-ventilated areas, avoid inhalation of vapors or mists, avoid contact with eyes and skin, keep away from open flames and hot surfaces, maintain good industrial hygiene.
Storage: Store in tightly closed original containers in a cool, well-ventilated area away from direct sunlight, incompatible substances, or ignition sources. Keep separate from oxidizing agents, strong acids, and bases.
Storage Conditions: Recommended temperature between 2°C and 8°C, avoid freezing, use explosion-proof electrical equipment.
Incompatible Materials: Strong oxidizers, acids, bases, water-reactive materials.
Exposure Limits: No occupational exposure limit established for Diphenyldiethoxysilane, monitor for possible release of ethanol.
Engineering Controls: Use adequate ventilation, such as local exhaust or process enclosure, to minimize vapor concentration.
Personal Protective Equipment: Use neoprene or butyl gloves, safety goggles with side shields, chemical-resistant apron. If vapor concentrations approach nuisance threshold, use a NIOSH-approved organic vapor respirator.
Hygiene Measures: Wash hands and face before breaks and after handling, remove contaminated clothing, do not eat, drink, or smoke during use.
Environmental Controls: Implement spill containment and ventilation to protect air and water quality.
Appearance: Clear, colorless to pale yellow liquid
Odor: Mild, aromatic
Odor Threshold: Not available
pH: Not applicable
Melting Point/Freezing Point: -60°C
Boiling Point/Range: 335°C
Flash Point: 156°C (closed cup)
Evaporation Rate: Not determined
Flammability: Flammable liquid
Upper/Lower Flammability Limits: Not established
Vapor Pressure: <0.1 mmHg at 20°C
Vapor Density: Heavier than air
Relative Density: 1.07 g/cm³ at 20°C
Solubility: Insoluble in water, soluble in most organic solvents
Partition Coefficient (Log Kow): Not evaluated
Auto-Ignition Temperature: Not established
Decomposition Temperature: Not determined
Viscosity: Low viscosity liquid
Chemical Stability: Stable under recommended storage and handling conditions
Possibility of Hazardous Reactions: Avoid contact with strong oxidizing agents. Vapors may react with moisture, producing ethanol.
Conditions to Avoid: Heat, open flames, sources of static discharge, incompatible materials
Incompatible Materials: Strong acids, bases, oxidizers, water (hydrolyzes slowly on contact)
Hazardous Decomposition Products: Thermal decomposition can generate irritating fumes, including silicon oxides, carbon oxides, and ethanol.
Routes of Exposure: Eye, skin, inhalation, ingestion
Acute Toxicity: Low oral and dermal toxicity in animal studies. LD50 values not available for humans.
Skin Corrosion/Irritation: Mild to moderate skin irritation in rabbits. Prolonged or repeated contact may dry skin.
Eye Damage/Irritation: May cause eye irritation with symptoms of redness and tearing.
Respiratory Irritation: Vapor or mist can cause irritation of the respiratory tract.
Chronic Effects: No evidence of mutagenicity, carcinogenicity, or reproductive toxicity identified in published literature.
Sensitization: Not classified as a sensitizer, limited data available.
Other Effects: Headache, dizziness, nausea from overexposure to vapor.
Ecotoxicity: Not acutely toxic to aquatic organisms at typical environmental concentrations. Large spills may pose risks to aquatic life.
Persistence and Degradability: Slowly hydrolyzes in water to silanols and ethanol. Degradation rate depends on pH and temperature.
Bioaccumulation: Low potential based on structure and physiochemical properties.
Mobility in Soil: Expected to exhibit low mobility, binds to soil particles.
Other Adverse Effects: Contains volatile organic compounds which can contribute to air pollution if released in large quantities.
Product Disposal: Dispose of as hazardous chemical waste according to local, state, and federal regulations. Do not discharge to sewage or open environment.
Container Disposal: Triple rinse empty containers, puncture and dispose of through an approved drum recycler or hazardous waste contractor.
Waste Code: Based on classification as a flammable and irritant substance, use appropriate waste code per jurisdiction.
Precautions: Prevent material from reaching watercourses or drains, keep disposal work environment well-ventilated.
UN Number: 1993
UN Proper Shipping Name: Flammable liquid, n.o.s. (contains Diphenyldiethoxysilane)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Environmental Hazards: Not classified as a marine pollutant
Special Precautions: Avoid mechanical shock, keep containers upright, segregate from incompatible substances, ensure proper labeling.
Regulatory References: Conforms to US DOT, IATA, and IMDG shipping requirements for Class 3 flammable liquids.
US Regulations: Listed under TSCA Inventory, subject to SARA Sec. 311/312 (fire hazard, acute health). Not listed as a carcinogen under NTP, IARC, OSHA.
EU Regulations: Registered under REACH, classified as hazardous according to Regulation (EC) No 1272/2008 (CLP).
Other International: Covered by Australia AICS, Canada DSL, Japan ENCS.
Labeling Requirements: Flammable liquid symbol, warning for eye and skin irritant, prevent release to environment.
Restrictions: Product must only be used for industrial applications and handled by trained personnel.
Emergency Planning: Facilities required to have spill contingency and emergency action plans in place as per OSHA/EPCRA guidelines.
