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Product Name: Silylation Solution
Synonyms: Silylating agent blend
Chemical Family: Organosilicon compounds
Recommended Use: Laboratory and industrial silylation reactions
Manufacturer Info: Contact details for responsible supplier, including emergency phone numbers and address.
CAS Numbers: Trimethylchlorosilane 75-77-4, N-methylimidazole 616-47-7, Hexamethyldisilazane 999-97-3, other proprietary ingredients
UN Number: 1993
Relevant Identifiers: EC Number, Index Number, product code
GHS Classification: Flammable liquid (Category 2), Acute toxicity (Category 3, inhalation & oral), Eye irritation (Category 2A), Skin corrosion (Category 1A), Specific target organ toxicity
Signal Word: Danger
Hazard Statements: Causes severe skin burns and eye damage, highly flammable, toxic if inhaled or swallowed, may cause respiratory irritation, harmful to aquatic life
Pictograms: Flame, Corrosion, Skull and Crossbones, Exclamation mark
Precautionary Statements: Keep away from heat and ignition sources, avoid breathing vapors, use only outdoors or in well-ventilated area, wash skin after handling, dispose of contents according to regulations
Routes of Exposure: Eyes, skin, inhalation, ingestion
Most Important Hazards: Fume inhalation can lead to pulmonary edema, skin contact causes chemical burns, vapor buildup leads to explosion risk
Other Hazards: Reacts violently with water, can release toxic gases including hydrogen chloride, forms slippery surface on spills
Main Ingredients: Trimethylchlorosilane (40–70%), Hexamethyldisilazane (15–30%), N-Methylimidazole (5–15%)
Impurities: Trace levels of chlorinated silanes, minor organic amines
CAS Numbers: 75-77-4, 999-97-3, 616-47-7
EC Numbers: 200-900-5, 213-668-5, 210-484-7
Specific Concentration Limits: Available on the SDS from supplier
REACH Registration Numbers: Provided by supplier as per regulatory requirements
General Advice: Move affected person from exposure area, ensure safety before offering first aid
Inhalation: Remove to fresh air, monitor respiratory health, administer oxygen if breathing becomes difficult, seek medical attention without delay
Skin Contact: Remove contaminated clothing, flush skin thoroughly with plenty of water for at least 15 minutes, do not neutralize, consult healthcare provider
Eye Contact: Rinse immediately with gentle stream of water for 20–30 minutes, lift eyelids, avoid rubbing, obtain immediate medical evaluation
Ingestion: Rinse mouth, do not induce vomiting, seek urgent medical attention, inform doctor of chemical exposure
Important Symptoms: Burns, irritation, redness, coughing, chest pain, difficulty breathing
Advice for First Responders: PPE including chemical-resistant gloves, safety goggles, and self-contained breathing apparatus
Suitable Extinguishing Agents: Dry chemical powder, carbon dioxide, foam, do not use water directly on fire
Special Hazards: Flammable vapor forms explosive mixtures with air, combustion releases corrosive and toxic vapors including hydrogen chloride, oxides of silicon
Protective Equipment: Full firefighting gear with self-contained breathing apparatus, resistant suit
Advice for Firefighters: Move containers away from fire area if safe, cool containers with flooding amounts of water applied from as far as possible, avoid inhalation of fumes
Further Information: Contain run-off, prevent from reaching drains or watercourses
Decomposition Products: Chlorine, hydrochloric acid, silicon oxides, nitrogen oxides
Personal Precautions: Evacuate area, ventilate, restrict access, use protective equipment including gloves, respirator, and goggles
Environmental Precautions: Do not allow spill into drains, surface water, soil, alert local authorities if substantial quantities enter environment
Methods for Cleaning Up: Contain with inert absorbent such as vermiculite or sand, scoop up and place in sealable container, do not use water for cleanup, clean area with non-aqueous cleaner
Procedures for Emergency Response: Identify source and stop leak if safe, remove ignition sources, avoid breathing vapor, advise relevant authorities
Disposal: Collection and disposal through certified hazardous waste contractor
Safe Handling Procedures: Handle in chemical fume hood, open containers only in well-ventilated space, wear chemical-resistant gloves, goggles, and lab coat, keep away from ignition and heat sources, avoid direct contact with skin, eyes, or inhalation of vapors
Storage Recommendations: Store in tightly closed original container, use nonreactive shelving, keep at below 25°C in a cool, dry, and well-ventilated area away from moisture, oxidizers, acids, amines, segregate from incompatible materials including alcohols and bases
Incompatibilities: Strong oxidizers, water, acids, alcohols
Bulk Storage Requirements: Containers should be made of suitable non-reactive materials, equipped with pressure-relief devices
Special Handling Advice: Transfer using grounded pumps to prevent static, ensure fire suppression system on site
Occupational Exposure Limits: Trimethylchlorosilane TWA 5 ppm, Hexamethyldisilazane TWA 10 ppm, consult local regulations
Engineering Controls: Chemical fume hood, explosion-proof ventilation, emergency eyewash stations and safety showers in work area
Personal Protective Equipment: Chemical splash goggles, face shield, chemical-resistant gloves (e.g., nitrile, neoprene), impervious lab coat, closed footwear
Respiratory Protection: Where exposure risk exists, use NIOSH-approved respirator for organic vapor, consider supplied-air or SCBA during spill response
Hygiene Measures: No eating, drinking, or smoking in work areas, wash hands and face after handling, remove contaminated clothing promptly
Environmental Exposure Controls: Prevent leaks or emissions into environment by ensuring enclosed process lines and proper ventilation
Appearance: Clear, colorless to pale yellow liquid
Odor: Sharp, pungent, ammonia-like
Odor Threshold: Not established
pH: Not available
Melting Point/Freezing Point: −63°C to −10°C
Boiling Point: 101°C (Trimethylchlorosilane), 126°C (HMDS)
Flash Point: 6°C (open cup)
Evaporation Rate: Rapid
Flammability: Highly flammable
Vapor Pressure: 90 mmHg at 20°C
Vapor Density: 3.5 (air=1)
Relative Density: 0.85 g/mL
Solubility: Decomposes in water, soluble in organic solvents
Partition Coefficient (n-octanol/water): Not applicable
Autoignition Temperature: 245°C
Decomposition Temperature: Decomposes above 150°C
Viscosity: Low (not measured)
Explosive Properties: Forms explosive mixtures in air
Oxidizing Properties: Not classified as oxidizer
Chemical Stability: Stable under recommended conditions, rapidly decomposes in contact with water
Conditions to Avoid: Heat, open flame, contact with water, direct sunlight, static electricity
Incompatible Materials: Strong oxidizing agents, water, alcohols, acids, strong bases, amines, moist air
Hazardous Decomposition Products: Hydrogen chloride, chlorinated silanes, silicon oxides, ammonia, nitrogen oxides
Hazardous Reactions: Contact with moisture produces corrosive, volatile gases; container rupture risk if heated
Acute Toxicity: Harmful or fatal if swallowed, inhaled, or absorbed through skin; LC50 (inhalation, rat) 1200 ppm (4 h); LD50 (oral, rat) 800 mg/kg
Skin Corrosion/Irritation: Severe burns, blistering, possible scarring
Eye Damage/Irritation: Severe damage, potential loss of vision
Respiratory Sensitizer: May cause asthma-like symptoms
Skin Sensitizer: Not expected
Mutagenicity: Data limited; not classified
Carcinogenicity: Not classified by NTP/IARC/OSHA
Reproductive Toxicity: No significant studies; precaution advised
Specific Target Organ Toxicity: May cause damage to respiratory system
Repeated Dose Toxicity: Prolonged inhalation may cause bronchitis, pulmonary edema
Symptoms of Overexposure: Burning sensation, headache, confusion, difficulty breathing, delayed pulmonary symptoms
Ecotoxicity: Harmful to aquatic life even at low concentrations
Aquatic Toxicity: LC50 (Fish, 96 hrs): 10–100 mg/L
Persistence and Biodegradability: Silylation agents hydrolyze rapidly in water, breakdown products less toxic
Bioaccumulation Potential: Not anticipated due to rapid hydrolysis, though limited studies exist
Mobility in Soil: Volatile, limited persistence, hydrolysis products mobile in water
Environmental Fate: Does not persist in environment, but local toxic effects possible
Other Adverse Effects: No data on effects on ozone layer or global warming
Disposal Methods: Must be collected and incinerated as hazardous waste in accordance with local, regional, and national regulations
Contaminated Packaging: Empty drum or bottles retain vapor and residue, triple rinse with organic solvent before disposal
Special Waste Codes: Refer to local hazardous waste codes; e.g., EPA RCRA code D001
Transport to Disposal: Use licensed waste carrier, ensure secondary containment
Precautions for Disposal: Do not dump into sewers, surface water, or soil; keep waste segregated
UN Number: 1993
UN Proper Shipping Name: Flammable Liquid, n.o.s. (contains trimethylchlorosilane, hexamethyldisilazane)
Transport Hazard Class: 3 (Flammable liquid)
Packing Group: II (Medium danger)
Hazard Labels: Flammable liquid, corrosive
Marine Pollutant Status: Not identified as marine pollutant
Special Precautions: Keep container upright, avoid heat and direct sunlight, mark and segregate from incompatible goods, comply with emergency schedules (EmS)
Regulatory Requirements: Transport by trained personnel only, carry Safety Data Sheet in vehicle
EU Regulations: Classified under CLP Regulation (EC) No 1272/2008
US Regulations: Covered by OSHA Hazard Communication Standard (29 CFR 1910.1200), Clean Air Act, SARA Title III Sections 311/312
REACH: Registered under Regulation (EC) No 1907/2006
International Inventories: Listed on TSCA, EINECS
Labeling Requirements: GHS pictograms, signal words, hazard and precaution statements as per local guidelines
Workplace Controls: Mandatory risk assessment, safety training, clear labelling
Other Legal Restrictions: Restricted for use by trained personnel, certain jurisdictions may limit maximum storage quantity, emergency response procedures must be posted
