Trichloro(octadecyl)silane

Trichloro(octadecyl)silane is an organosilicon compound with the molecular formula C18H37Cl3Si and CAS number 112-04-9. This silane coupling agent features a long octadecyl (C18) hydrocarbon chain attached to a silicon atom bonded to three chlorine atoms. With a molecular weight of 387.9 g/mol, it serves as a surface modification agent that can create hydrophobic surfaces by forming covalent bonds between organic and inorganic materials.

Trichloro(octadecyl)silane is typically a colorless to pale yellow liquid at room temperature with a characteristic sharp, acrid odor. The compound is moisture-sensitive and reacts readily with water, releasing hydrogen chloride gas. It is soluble in organic solvents such as toluene, hexane, and chloroform but insoluble in water due to its long hydrocarbon chain and hydrolytic instability in aqueous environments.

Trichloro(octadecyl)silane is primarily used as a surface treatment agent to create hydrophobic and oleophobic coatings on glass, metal, and ceramic surfaces. It serves as a coupling agent in composite materials, improving adhesion between organic polymers and inorganic fillers. Additional applications include surface modification of nanoparticles, anti-sticking coatings, water-repellent treatments, and as a primer for adhesive bonding in various industrial processes.

Trichloro(octadecyl)silane should be handled in well-ventilated areas or under fume hoods to avoid inhalation of vapors and hydrogen chloride gas released upon contact with moisture. Wear appropriate personal protective equipment including chemical-resistant gloves, safety goggles, and protective clothing. Avoid contact with skin, eyes, and clothing. Use only dry tools and containers, as the compound is moisture-sensitive and can react vigorously with water.

Trichloro(octadecyl)silane must be stored in tightly sealed containers in a cool, dry place away from moisture and humidity. Keep containers in a well-ventilated area away from heat sources and incompatible materials such as water, alcohols, and strong bases. Use moisture-proof storage systems with desiccants if necessary. Store away from metals that may be corroded by hydrogen chloride gas generated from hydrolysis reactions.

In case of skin contact with trichloro(octadecyl)silane, immediately remove contaminated clothing and wash the affected area thoroughly with soap and water for at least 15 minutes. For eye contact, flush immediately with clean water for 15-20 minutes and seek medical attention. If inhaled, move to fresh air immediately. In case of ingestion, do not induce vomiting and seek immediate medical attention. Remove contaminated clothing before reuse.

Trichloro(octadecyl)silane must be disposed of as hazardous chemical waste in accordance with local and national regulations. Do not discharge into sewers, waterways, or soil. Small quantities can be carefully hydrolyzed with excess water under controlled conditions, neutralizing the resulting hydrochloric acid before disposal. Large quantities should be collected in appropriate containers and disposed of through licensed hazardous waste disposal companies following applicable environmental regulations.

Trichloro(octadecyl)silane is classified as ADR Class 8 (corrosive substances), Packing Group II for transportation purposes. It must be packaged in appropriate containers meeting UN packaging specifications and properly labeled with hazard placards. Transport documents must include the correct shipping name and hazard information. Ensure containers are tightly sealed and protected from moisture during transport to prevent hydrolysis and pressure buildup from hydrogen chloride gas generation.

Trichloro(octadecyl)silane is subject to REACH regulation in the European Union and must be registered for commercial use above tonnage thresholds. It is not currently listed as a Substance of Very High Concern (SVHC). Users must comply with CLP regulation requirements for classification, labeling, and packaging. Industrial users should implement appropriate risk management measures and may need to register uses depending on tonnage and application. Local workplace safety regulations also apply.

Trichloro(octadecyl)silane is available through OYSI, a specialized European distributor of technical chemicals serving industrial customers across Europe. OYSI provides this organosilicon compound to various industries requiring surface treatment and coupling agents. As a professional chemical distributor, OYSI ensures proper handling, packaging, and regulatory compliance for industrial applications. Contact OYSI directly for availability, technical specifications, and pricing information tailored to your specific requirements.