Product Name: N-Dodecylmethyldichlorosilane
Chemical Formula: C13H29Cl2Si
CAS Number: 18173-67-4
Use: Usually found in chemical manufacturing, surface treatment, and as a reagent in organic synthesis.
Supplier: Chemical laboratories, specialty material manufacturers, and global industrial suppliers distribute and stock this compound for regulated research and production use.
Contact Information: Manufacturer’s emergency contact numbers offer guidance on emergencies and safe material handling processes.
GHS Classification: Corrosive to metals, skin corrosion/irritation category 1A, serious eye damage category 1, aquatic acute category 2
Signal Word: Danger
Hazard Statements: Causes severe burns to skin and eyes on contact, releases fumes that choke unprotected airways, brings risk to aquatic plants and animals upon environmental release, known to hydrolyze easily with water and generate hydrogen chloride gas.
Pictograms: Corrosive symbol present on packaging and transport documents.
Precautionary Statements: Treat all containers with care, avoid direct skin or eye contact, limit inhalation or ingestion, ensure all operations proceed in a well-secured laboratory or industrial setting with proper ventilation and containment.
Target Organs: Eyes, skin, mucous membranes, lungs.
Chemical Name: N-Dodecylmethyldichlorosilane
Synonyms: Dodecylmethyldichlorosilane, Dodecylchloromethylsilane
Concentration: 100% active ingredient in pure form
Impurities or Stabilizing Additives: Usually none present outside of trace synthesis byproducts. Inventoried batches follow regular analytical checks for purity and contaminant content.
Ingestion: Seek immediate medical attention. Do not induce vomiting unless directed by a medical professional. Rinse mouth thoroughly with water.
Inhalation: Remove to fresh air quickly, provide oxygen if breathing becomes difficult. Seek a medical assessment even for minor symptoms, as lung irritation or pulmonary edema can develop slowly.
Skin Contact: Strip off contaminated clothing, rinse skin under running water for no less than 20 minutes. Use neutral soap where possible. Burn-like wounds may need specialized treatment.
Eye Contact: Flush eyes with large amounts of water for at least 20 minutes, lifting eyelids to remove all traces. Consult an ophthalmologist without delay.
Symptoms: Severe pain, redness, blistering, burns, coughing, shortness of breath, headache, and gastrointestinal distress.
Suitable Extinguishing Media: Dry chemical, foam, or carbon dioxide. Steer clear of water, as water exposure accelerates hydrolysis, producing corrosive and choking hydrogen chloride vapors.
Unsuitable Extinguishers: Direct water streams promote hazardous fume release.
Special Hazards: Under fire conditions, flammable silicon compounds and corrosive gases will appear rapidly.
Protective Equipment: Firefighters need suitable chemical-resistant clothing, self-contained breathing apparatus (SCBA), and face protection.
Advice: Cool surrounding storage containers with water spray only from a safe distance, use non-sparking tools to break up concentration points.
Spill Cleanup: Isolate area, keep untrained people out. Equip cleanup crew with acid-resistant gloves, goggles, and full respiratory protection. Absorb with inert dry materials like sand or vermiculite, scoop into corrosion-proof waste drums for disposal.
Environmental Precautions: Prevent leaching into soil, sewers, or waterways. Notify relevant local authorities if exposure risk enters public water systems.
Decontamination: Clean all hard surfaces with sodium bicarbonate or carbonate solution, never use excessive water except for final wash-down under controlled ventilation. Monitor air quality during and after the cleanup process.
Handling: Always transfer liquids in fume hoods or ventilated areas. Ground all containers to prevent static discharge sparking. Wear chemical-protective gloves, coats, goggles, and face shields in every operation—chemicals splash unpredictably. Never mix with water or incompatible substances in uncontrolled conditions.
Storage: Keep in cool, dry, corrosion-resistant containers tightly sealed. Store away from all moisture, oxidizers, acids, and bases, labeling every storage area for alertness. Isolate in designated hazardous chemical storage with secondary containment. Train staff in spill and leak response for this substance.
Exposure Limits: No set OSHA PEL, NIOSH REL, or ACGIH TLV. Follow best-practice industrial hygiene by eliminating all unnecessary exposure.
Respiratory Protection: When airborne concentrations increase, equip workers with NIOSH-approved respirators. Emergency situations need supplied-air or full-facepiece respirators.
Skin Protection: Impermeable gloves (nitrile, PVC, neoprene), sleeves, aprons, and boots offer a physical barrier.
Eye/Face Protection: Full chemical splash goggles and a face shield reduce risks from accidental splashes or vapors.
Engineering Controls: Use corrosion-proof local exhaust ventilation systems, regularly check air monitors, and enforce chemical safety zone boundaries.
Appearance: Colorless to pale yellow liquid with a pungent odor
Melting Point: Not determined specifically; estimated below zero Celsius
Boiling Point: 310-315°C at standard pressure
Density: Approximately 0.91 g/cm³ at room temperature
Vapor Pressure: Estimated low at ambient temperature
Solubility: Immiscible with water, vigorous reaction occurs; soluble in many organic solvents
Flash Point: 125°C (open cup) (varies with purity and humidity)
Autoignition Temperature: Not tested directly
Reactivity with Water: Reacts rapidly, especially if humid air is present, producing corrosive hydrochloric acid vapor and silanols.
Stability: Stable under dry, inert gas or tightly sealed conditions. Deteriorates quickly in the presence of moisture.
Incompatible Materials: Water, oxidizing agents, alcohols, acids, and bases trigger violent decomposition and gas evolution.
Hazardous Decomposition: Hydrogen chloride gas, siloxanes, and other low-molecular-weight silanes form, most of which harm airways and tissues on contact.
Polymerization: Not reported for normal use conditions.
Storage Conditions: Keep away from all potential ignition sources, maintain fully sealed containers.
Acute Toxicity: Corrosive effects on skin, eyes, respiratory and digestive tracts. Swallowing small amounts damages mouth, throat, esophagus, and stomach.
Skin Sensitization: Causes burns, may result in chronic ulceration or scarring without prompt first aid.
Eye Damage: Severe eye burns, potential for blindness if not flushed immediately.
Inhalation Risks: Breathing fumes or vapors brings on rapid irritation and, with higher doses, pulmonary edema.
Chronic Exposure: Repeated skin contact leads to dryness, cracking, and chronic dermatitis. Breathing fumes repeatedly over time can reduce lung function.
Carcinogenicity: Not listed by IARC, NTP, or OSHA as a carcinogen, but always follow exposure minimization approaches.
Environmental Fate: Hydrolyzes quickly on environmental contact, forming silanols and hydrochloric acid that acidify local soils and waters.
Toxicity to Aquatic Life: Acute and chronic toxic effects on aquatic flora and fauna, especially as a result of low pH upon hydrolysis.
Bioaccumulation: No significant bioaccumulation risk known for the parent compound; breakdown products may still disrupt local ecosystems.
Soil Mobility: Breaks down and binds sparingly to organic matter, but acidification renders soil less fertile.
Advice: Never drain into open water, storm drains, or soil.
Waste Disposal: Collected material and all contaminated items must go to licensed chemical disposal facilities. Do not landfill, incinerate without proper off-gas scrubbing, or mix with municipal solid waste.
Contaminated Packaging: Treat empty containers as hazardous waste, puncture and triple rinse only in controlled, contained environments before recycling or disposal.
Regulatory Status: Must follow national and local hazardous waste rules. Keep detailed disposal logs to prove chain of custody and treatment before landfill or destruction.
UN Number: 2987
Proper Shipping Name: Organosilicon compound, corrosive, n.o.s. (N-Dodecylmethyldichlorosilane)
Transport Hazard Class: 8 (corrosive substances)
Packing Group: II (causes severe harm quickly)
Labeling: Corrosive and marine pollutant markings must be clear on every container or truck.
Environmental Hazards: Regulated as a marine pollutant, never ship with incompatible chemicals.
Special Precautions: Emergency information cards accompany every shipment, drivers briefed on emergency spill response.
Inventory Listings: Generally registered under local, regional, and global chemical inventories (TSCA in US, REACH in Europe, etc).
Hazard Communication: Subject to worker right-to-know legislation; safety trainings and up-to-date labeling expected in the workplace.
Exposure Regulations: Workers must have documented PPE access and hazardous chemical safety training on file.
Reporting Thresholds: Falls under environmental release reporting at federal and local levels. Import and export tightly scrutinized under dual-use and environmental law.
Other Rules: Periodic review of best practices, regular inspections, and compliance checks by national agencies.
