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Chinese name of the identifier: Trichlorosilane； Silicon mimic ； Silanochloroform ； Trichlorosilane Silicon tetrachloride ； Silicon tetrachloride English name: Trichlorosilane ； Silicochloroform, also known as tetrachlorosilane. Molecular formula: HCl₃Si; SiCl₄. Structural formula: Not specified. Molecular weight: 135.44; 169.9. CAS numbers: 10025-78-2; 10026-04-7. RTECS numbers: VV5950000; VW0525000. HS code: Not specified. UN number: 1295; 1818. Hazardous goods identification numbers: 43049; 81043. IMDG rule page numbers: 4370; 8221. Physical and chemical properties: Colorless liquid that is highly volatile. There is a suffocating smell. Colorless or pale yellow fuming liquid with an irritating odor, prone to deliquescence. Primary use: Used in the manufacture of silicon compounds. It is used to produce pure silicon, ethyl silicate, etc., and is also used to make smoke agents. Melting point: -134 to -70 °C; Boiling point: 31.8 to 57.6 °C. Relative density (water = 1): 1.37 to 1.48; Relative density (air = 1): 4.7 to 5.86. Saturated vapor pressure (kPa): 53.33 at 14.5 °C; 55.99 at 37.8 °C. Solubility: Soluble in benzene, ether, and most other organic solvents. It is miscible with most organic solvents such as benzene, chloroform, and petroleum ether. Critical temperature (°C): Critical pressure (MPa): Heat of combustion (kJ/mol): No data available; meaningless. Combustion, explosion – Hazardous. Conditions to avoid contact with: Moist air. In contact with humid air. Flammability: Flammable, not combustible. Building code fire hazard classification: Class A. Flash point (°C): -13.9°C (open cup). Spontaneous combustion temperature (°C): 104°C – not applicable. Lower explosive limit (V%): 1.2% – not applicable. Upper explosive limit (V%): 90.5% – not applicable. Hazardous characteristics: Flammable in the presence of open flames or high temperatures. It can react violently with oxidizers. It reacts with water, generating heat and releasing toxic, corrosive gases. In the event of high temperatures, the pressure inside the container increases, posing a risk of cracking and explosion. Flammability (red): 4 Reactivity (yellow): 2 Special hazards: Reacts with water; releases heat when heated or in contact with water, producing toxic and corrosive fumes. Combustion (decomposition) products: hydrogen chloride, silicon oxide. Hydrogen chloride, silicon oxide. Stability: Stable, Stable. Polymerization hazards: Must not occur, Must not occur. Contraindications: Acids, strong bases, strong oxidizing agents, water, alcohols, amines. Strong oxidizing agents, alcohols, water, strong bases. Fire extinguishing methods: carbon dioxide, dry powder, sand. Water use is prohibited. The use of foam is prohibited. Steam is heavier than air and tends to accumulate in lower areas. Vapor in enclosed areas can explode when exposed to fire. Steam can spread over long distances, catch fire upon encountering an ignition source, and cause backdraft. The storage container and its components may be ejected in all directions over long distances. If the substance or contaminated fluid enters waterways, notify downstream users who may be affected by water pollution, as well as local health and fire department* personnel and pollution control agencies. If there is no leakage, use misted water to cool the exposed container from a safe, explosion-proof distance. Sand, dry powder. Water use is prohibited. Packaging and transport hazard classification: Category 4.3 – Flammable materials when exposed to moisture; Category 8.1 – Acidic corrosive substances. Hazardous goods packaging mark: 10 ； 34 ； 41 20 Packaging category: II II Storage and transportation notes: Store in a dry and clean warehouse. Keep away from flames and heat sources. The warehouse temperature should not exceed 25°C. Avoid light exposure. The packaging must be sealed to prevent moisture from getting in. It should be stored separately from oxidizers, acids, and bases. The lighting, ventilation, and other facilities in the storage area should be of explosion-proof type, with switches located outside the warehouse. Equipped with fire-fighting equipment of the appropriate types and quantities. The use of mechanical equipment and tools that can generate sparks is prohibited. Handle with care during transportation to prevent damage to the packaging and containers. The transport must follow the designated route and must not stop en route. Transportation is not advisable on rainy days. Disposal: Refer to ** and local relevant regulations before disposal. For waste storage, see “Storage and Transportation Precautions”. Dispose of it using controlled combustion. Dissolve in a flammable solvent or mix with fuel before burning. The gases emitted from the incinerator must be removed through a scrubber. Packaging method: glass bottles with threaded mouths, glass bottles with iron caps, plastic bottles, or metal drums/tanks enclosed in wooden crates ； Wooden crate outside the ampoule bottle. ERG Guide Classification: 139 ERG Guide Category: Water-reactive substances (releasing flammable and toxic gases). Store in a dry, clean warehouse. Keep away from flames and heat sources. The packaging must be sealed to prevent moisture from getting in. It should not be stored or transported together with food-grade chemical raw materials and alkalis. Handle with care during transportation to prevent damage to the packaging and containers. The transport must follow the designated route and must not stop en route. Transportation is not advisable on rainy days. Disposal: Dispose in accordance with the requirements of ** and relevant local regulations. Or contact the vendor or manufacturer to determine the disposal method. Packaging method: glass bottles with threaded mouths, glass bottles with iron caps, plastic bottles, or metal drums/tanks enclosed in wooden crates ； Acid-resistant jars, ceramic pots, in wooden boxes or semi-grilled boxes ； Glass bottles, plastic drums in wooden crates or semi-grilled crates ； Plastic bottles, tin-plated thin steel sheet drums, and externally covered bottom-grid boxes. Toxicity hazards: Exposure limit: China’s MAC: 3 mg/m3; Soviet Union’s MAC: 1 mg/m3. United States’ TWA: No standard established; United States’ STEL: No standard established. China’s MAC: No standard established; Soviet Union’s MAC: No standard established. United States’ TWA: No standard established; United States’ STEL: No standard established. Routes of exposure: Inhalation, ingestion, dermal absorption. Toxicity: LD50: 1030 mg/kg (oral, rats); LC50: 1500 mg/m3 for 2 hours (inhalation, mice). LD50/LC50: 8000 ppm for 4 hours (inhalation, rats). Health hazards: Reacts with water to produce hydrochloric acid fumes, which irritate the eyes and upper respiratory tract. At high concentrations, it can cause corneal damage, respiratory inflammation, and even pulmonary edema. It is often accompanied by symptoms such as dizziness, headache, fatigue, nausea, vomiting, and palpitations. If it splashes on the face, it can cause necrosis and ulcers that do not heal over time. Chronic animal poisoning is manifested as chronic catarrhal tracheitis, bronchitis, and early pulmonary sclerosis. OSHA Process Safety Management for Highly Hazardous Chemicals: 29CFR 1910.119, Appendix A, threshold value of 5000 lb (2268 kg). Health hazards (blue): 3 Causes severe irritation to the eyes and upper respiratory tract. High concentrations can cause corneal opacity, respiratory inflammation, and even pulmonary edema. Contact with the skin can cause tissue necrosis. Emergency – Skin contact: Remove contaminated clothing and immediately rinse thoroughly with flowing water. If there is a burn, seek medical treatment. Make sure the patient stays warm and quiet. Ensure that medical staff are aware of the individual protective measures related to this substance and take care to protect themselves. Immediately remove the contaminated clothing and rinse with running water for 15 minutes. If there is a burn, seek medical treatment. Eye contact: Immediately lift the eyelids and rinse with flowing water or saline for at least 15 minutes. Seek medical attention. Immediately lift the eyelids and rinse with running water for 10 minutes or with a 2% sodium bicarbonate solution. Inhalation: Quickly move to a place with fresh air. Keep the airways clear. Oxygen is administered when there is difficulty breathing. When breathing stops, perform artificial respiration immediately. Seek medical attention. If the patient has ingested or inhaled this substance, do not perform mouth-to-mouth resuscitation; instead, use a breathing apparatus with a one-way valve or another appropriate medical breathing device. Quickly leave the area and go to a place with fresh air. Keep warm and keep your airways clear. Perform artificial respiration if necessary. Seek medical attention. Ingestion: Those who accidentally ingest it should rinse their mouth immediately and be given milk or egg white to drink. Seek medical attention. The patient should rinse their mouth immediately while awake, and be given milk or egg white to drink. Seek medical attention. Engineering controls for protective measures: enclosed operation, local exhaust ventilation. Operate in a closed environment and ensure proper ventilation. Mechanize and automate as much as possible. Respiratory protection: When the concentration in the air exceeds safe levels, a gas mask should be worn. It is recommended to wear a self-contained breathing apparatus during emergency rescue or evacuation. When there may be exposure to its vapors or fumes, a gas mask or supplied-air helmet must be worn. It is recommended to wear a self-contained breathing apparatus during emergency rescue or evacuation. Eye protection: Wear chemical safety goggles. Wear chemical safety goggles. Protective clothing: Wear appropriate protective clothing. Wear work clothes (made of corrosion-resistant material). Hand protection: Wear chemical-resistant gloves. Wear rubber gloves. Others: Smoking, eating, and drinking are prohibited at the work site. After work, take a shower and change clothes. Maintain good hygiene* habits. After work, take a shower and change clothes. Store clothes contaminated with toxins separately, and use them after washing. Maintain good hygiene* habits. Leak handling: Evacuate people from the contaminated area to a safe zone, prevent unauthorized persons from entering the contaminated area, and eliminate any sources of fire. It is recommended that emergency responders wear self-contained breathing apparatus and chemical protective clothing. Do not come into direct contact with the spill; seal it up only when it is safe to do so. Spraying mist reduces evaporation, but it does not decrease the flammability of the leak in confined spaces. It is absorbed by mixing with sand or other non-flammable adsorbents, and then collected and transported to a waste disposal site for disposal. In the event of a large leak, have it removed under the guidance of technical personnel. Regulatory information: Regulations on the Safe Management of Chemical Hazards (issued by the State Council on February 17, 1987); Detailed Rules for the Implementation of the Regulations on the Safe Management of Chemical Hazards (Document No. Hualao Fa 677); Provisions on the Safe Use of Chemical Hazards in the Workplace (Document No. Laobu Fa 423). These regulations set out corresponding rules regarding the safe use, production, storage, transportation, and handling of chemical hazards ； The Classification and Labelling of Commonly Used Hazardous Chemicals (GB13690－92) classifies this substance as a Category 4.3 flammable material when exposed to moisture. Environmental information: Air Pollution Prevention Act: Accident leakage prevention / Flammable substances (Table 3, Item 112(r)); critical value (90): 4540 kg. Evacuate people from the polluted area to safe zones; unauthorized personnel are prohibited from entering the polluted area. It is recommended that emergency responders wear self-contained breathing apparatus and chemical protective clothing. Do not come into direct contact with the spill; prevent the spill from coming into contact with flammable materials (such as wood, paper, oil, etc.). Seal the leak only when it is safe to do so. Spraying mist slows down evaporation (or diffusion), but do not spray water directly on the spill or the leak site. Sprinkle soda ash on the ground, then rinse it with plenty of water; the diluted washwater is discharged into the wastewater system. In the event of a large-scale leak, use dikes to contain it; it is best not to