Product Name: N-Octadecylmethyldiethoxysilane
Chemical Formula: C26H56O2Si
Synonyms: Octadecyl(methyl)diethoxysilane
CAS Number: 67409-08-9
Recommended Uses: Surface treatment, hydrophobic agent in industrial coatings, resin modification
Manufacturer: Contact supplier for details
Emergency Phone Number: Provided by supplier or local poison center
GHS Classification: Flammable liquids (Category 3), Skin irritation (Category 2), Eye irritation (Category 2A), Specific target organ toxicity - single exposure (Category 3)
Signal Word: Warning
Hazard Statements: Flammable liquid and vapor, causes skin and eye irritation, may cause respiratory irritation
Pictograms: Flame, Exclamation mark
Precautionary Statements: Keep away from heat or sparks, use non-sparking tools, avoid breathing vapors or mist, wear protective gloves, protective clothing, and eye protection
Chemical Name: N-Octadecylmethyldiethoxysilane
CAS Number: 67409-08-9
Concentration: ≥ 97%
Impurities: May contain minor traces of other organosilicon compounds
Stabilizers/Additives: None intentionally added
Inhalation: Move person to fresh air, keep at rest, seek medical attention if symptoms develop such as dizziness or shortness of breath
Skin Contact: Remove contaminated clothing, rinse skin thoroughly with soap and water; seek medical advice if irritation persists
Eye Contact: Flush eyes with plenty of clean running water for at least 15 minutes, lift eyelids occasionally, seek medical attention if discomfort remains
Ingestion: Rinse mouth, do not induce vomiting unless directed by a medical professional, get medical assistance if significant amounts are swallowed or symptoms occur
Most Important Symptoms/Effects: Irritation to skin, eyes, respiratory tract; potential for headache or dizziness if vapors are inhaled
Notes to Physician: Treat symptomatically, monitor for respiratory distress or chemical pneumonitis after significant exposure
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, alcohol-resistant foam; avoid using water jet
Special Hazards: Vapor may form explosive mixtures with air, thermal decomposition emits silicon oxides, carbon oxides, and other toxic fumes
Advice for Firefighters: Wear positive-pressure self-contained breathing apparatus and full protective gear
Specific Methods: Contain run-off to prevent spread to water supply, cool exposed containers with water spray, remove from danger zone if safe
Combustion Products: Carbon dioxide, carbon monoxide, silicon dioxide, traces of organic fragments depending on fire conditions
Personal Precautions: Evacuate area if vapor present in confined space, ventilate area, avoid breathing vapors, use personal protective equipment including chemical-resistant gloves and goggles
Environmental Precautions: Prevent entry to sewers, water supplies, or soil; alert authorities if spill enters environment
Spill Cleanup Methods: Absorb with inert material like sand or vermiculite, collect into labeled closed containers, clean residue with appropriate solvent, dispose through licensed waste handler
Other Precautions: Remove all ignition sources, use explosion-proof equipment during clean-up
Safe Handling: Avoid contact with skin, eyes, and clothing; prevent formation of aerosol; ground and bond containers during transfer; use in well-ventilated area or fume hood
Storage: Store in tightly closed containers, in cool, dry, and well-ventilated facility, away from heat, open flames, strong oxidizing agents; keep away from direct sunlight and moisture
Incompatible Materials: Strong acids, strong bases, strong oxidizers
Specific End Use(s): Industrial and laboratory applications where practiced chemical safety and engineering controls are in place
Occupational Exposure Limits: None established for this compound; recommended to minimize exposure to all organosilanes
Engineering Controls: Adequate ventilation essential, local exhaust at points of emission, use chemical fume hood for large quantities
Personal Protective Equipment: Safety goggles, chemical-resistant gloves (nitrile recommended), lab coat, if ventilation inadequate use approved respirator
Special Requirements: Emergency eye wash and safety shower accessible in near proximity
Hygiene Measures: Wash hands thoroughly after handling and before meals or breaks, remove contaminated clothing and wash before reuse
Appearance: Clear, colorless to pale yellow liquid
Odor: Slight, faint odor
pH: Not applicable
Melting Point: Not determined, may solidify below 10°C
Boiling Point: Approximately 340-360°C
Flash Point: 104°C (closed cup)
Evaporation Rate: Slow compared to ether
Flammability: Flammable liquids category 3
Vapor Pressure: Very low at ambient temperature
Vapor Density: Heavier than air
Density: About 0.85 g/cm³ at 25°C
Solubility in Water: Practically insoluble, reacts slowly
Partition Coefficient (log Kow): High (expected hydrophobic behavior)
Auto-ignition Temperature: 370°C
Decomposition Temperature: Not available
Viscosity: Not measured
Chemical Stability: Stable under ordinary conditions, sensitive to moisture and hydrolysis
Reactivity: Hydrolyzes slowly in presence of water or moisture, generates ethanol
Possibility of Hazardous Reactions: Contact with strong oxidizers, acids, or bases may cause exothermic reaction
Conditions to Avoid: Ignition sources, excessive heat, contact with moisture, prolonged exposure to air
Incompatible Materials: Water, acids, oxidizing and reducing agents
Hazardous Decomposition Products: Silicon oxides, carbon oxides, ethanol, possible traces of other organic fragments
Acute Toxicity: Not well defined; expected to be low for single exposures based on related compounds
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Symptoms of Exposure: Skin and eye irritation, respiratory discomfort, possible headache, drowsiness, nausea after inhalation
Skin Corrosion/Irritation: Causes mild to moderate irritation in direct contact
Serious Eye Damage/Irritation: Causes irritation, possible redness and tearing
Respiratory Sensitization: Prolonged inhalation may cause coughing, irritation of respiratory tract
Ingestion Effects: May cause stomach upset, abdominal discomfort, no significant systemic toxicity expected
Chronic Effects: No long-term studies available for this compound specifically; similar organosilanes showed no carcinogenic, mutagenic, or reproductive toxicity in standard testing
Other Data: Avoid repeated or prolonged exposure; apply good chemical hygiene practices at all times
Ecotoxicity: Not extensively studied; low solubility in water, expected to have low acute aquatic toxicity, may float and form slicks
Persistence and Degradability: Hydrolyzes slowly in environmental conditions to alcohol and silanol, persists as hydrophobic residue
Bioaccumulation Potential: Expected moderate to high due to hydrophobic molecular structure
Mobility in Soil: Limited, high adsorption to soil particles, unlikely to move to groundwater
Other Adverse Effects: Commercial use should prevent release to waterways; monitor regulatory limits on organosilanes
Waste Treatment Methods: Incinerate in approved facility or dispose through licensed chemical waste company
Unclean Packaging: Rinse containers completely before recycling or incineration; observe hazardous waste labeling and shipping rules
Special Precautions: Do not discharge to drains, sewers, or natural water systems; comply with local and national regulations
UN Number: UN 1993
Proper Shipping Name: Flammable liquid, n.o.s. (contains N-Octadecylmethyldiethoxysilane)
Transport Hazard Class: 3 (Flammable liquids)
Packing Group: III
Hazard Labels: Flammable liquid symbol
Special Precautions for User: Avoid rough handling, keep containers upright, away from ignition sources
Labelling According to GHS: Flammable liquid, causes skin and eye irritation
Chemical Inventories: Listed or notification may be required in EU (REACH), US (TSCA), Canada (DSL), Asia-Pacific markets
Other Regulations: Observe workplace exposure guidelines, environmental emission restrictions, safe handling and disposal requirements as set by national legislation
Restrictions: Use in well-controlled professional or industrial environments; restricted use in consumer applications unless safety engineered
