**What kind of gas mask should be used for thiophene?

You can check their MSDS sheets; they contain good information on protective measures

Route of entry: Health hazards: This product has **effects. In cases of inhalation poisoning in mice, there is motor excitement, ataxia, **, and ultimately death. In chronic poisoning experiments, mice exhibited abnormal behavior, halted weight gain, and changes in liver function. It has a mild irritant effect on the skin. 　　Environmental hazard: It can cause pollution to water bodies. 　　Flame and explosion hazard: This product is flammable. 　　Part 4: First Aid Measures Skin contact: Remove contaminated clothing and thoroughly wash the skin with soapy water and clean water. 　　Eye contact: Lift the eyelids and rinse with flowing water or saline. Seek medical attention. 　　Inhalation: Quickly move to a place with fresh air. Keep the airway clear. If there is difficulty breathing, administer oxygen. If breathing stops, perform artificial respiration immediately. Seek medical attention. 　　Ingestion: Drink plenty of warm water and induce vomiting. Seek medical attention. 　　Part V: Fire-fighting measures Hazardous characteristics: Prone to combustion when exposed to high temperatures, open flames, and strong oxidizing agents. 　　Harmful combustion products: carbon monoxide, carbon dioxide, hydrogen sulfide, sulfur oxides. 　　Fire extinguishing method: Cool the container with water; if possible, move the container away from the fire to an open area. Foam, carbon dioxide, dry powder, sand. 　　Part 6: Emergency Response to Leaks Emergency measures: Quickly evacuate people from the area contaminated by the leak to a safe zone, and implement isolation while strictly restricting access. Cut off the source of fire. It is recommended that emergency responders wear self-contained positive-pressure breathing apparatus and protective clothing. Seal the source of the leak as much as possible. Prevent entry into confined spaces such as sewers and drainage ditches. Minor leaks: Absorb with activated carbon or other inert materials. It can also be brushed with an emulsion made from non-flammable dispersants; the cleaning solution, after being diluted, is then discharged into the wastewater system. Large-scale leakage: Build dikes or dig pits to contain it. Cover with foam to reduce vapor damage. Transfer to a tank truck or specialized collector using an explosion-proof pump, and recycle it or transport it to a waste disposal facility for disposal. 　　Part 7: Handling, Disposal, and Storage Handling precautions: Operate in a closed environment with local exhaust ventilation. Operators must receive specialized training and strictly adhere to operating procedures. It is recommended that operators wear self-priming filter-type gas masks (half-masks), safety goggles, protective clothing resistant to toxic substances, and oil-resistant rubber gloves. Stay away from sources of fire and heat; smoking is strictly prohibited in the workplace. Use explosion-proof ventilation systems and equipment. Prevent steam from leaking into the workplace air. Avoid contact with oxidizers. During filling, the flow rate should be controlled, and a grounding device should be in place to prevent static electricity buildup. Handle with care during transportation to prevent damage to the packaging and containers. Equipped with fire-fighting equipment of appropriate types and quantities, as well as emergency response equipment for leaks. Empty containers may still contain harmful substances. 　　Storage precautions: Store in a cool, well-ventilated warehouse. Keep away from flames and heat sources. The storage temperature should not exceed 30°C. Keep the container sealed. It should be stored separately from oxidizers; mixed storage is strictly prohibited. Use explosion-proof lighting and ventilation facilities. The use of mechanical equipment and tools that may generate sparks is prohibited. The storage area should be equipped with emergency response equipment for leaks and appropriate containment materials. 　　Part 8: Exposure Control/Personal Protection Occupational Exposure Limits China’s MAC (mg/m3): No standard established Former Soviet Union’s MAC (mg/m3): No standard established TLVTN: No standard established TLVWN: No standard established Monitoring Methods: Engineering controls: Enclosed operations, local exhaust ventilation. Provide safety showers and eye wash stations. 　　Respiratory protection: When the concentration in the air is high, it is recommended to wear a self-priming filter-type respirator (half-mask). 　　Eye protection: Wear safety goggles. 　　Body protection: Wear chemical-resistant work clothing. 　　Hand protection: Wear rubber oil-resistant gloves. 　　Other protections: Smoking is strictly prohibited at the work site. After finishing work, take a shower and change. Pay attention to personal hygiene. 　　Part 9: Physical and Chemical Properties Major component: Pure substance Appearance and properties: Colorless liquid. 　　pH: Melting point (°C): -96.2 Boiling point (°C): 119 Relative density (water=1): 1.00 Relative vapor density (air=1): No data available Saturated vapor pressure (kPa): No data available Heat of combustion (kJ/mol): No data available Critical temperature (°C): No data available Critical pressure (MPa): No data available Logarithm of octanol/water partition coefficient: No data available Flash point (°C): 12.8 Ignition temperature (°C): No data available Upper explosive limit (% V/V): No data available Lower explosive limit (% V/V): No data available Solubility: Insoluble in water; soluble in ethanol, ether, benzene, and propane. 　　Primary uses: Used as a solvent and an intermediate in organic synthesis. 　　Other physical and chemical properties: Part 10: Stability and Reactivity Stability: Incompatible substances: Strong oxidizing agents. 　　Conditions to avoid contact: Polymerization hazards: Decomposition products: Part XI: Toxicological data Acute toxicity: LD50: No data available LC50: 27,000 mg/m3, 2 hours (inhalation by mice) Subacute and chronic toxicity: Irritation: Sensitization: Mutagenicity: Teratogenicity: Carcinogenicity: Part XII: Ecological data Ecotoxicity: Biodegradability: Non-biodegradability: Bioaccumulation: Other harmful effects: This substance may be harmful to the environment; special attention should be paid to water bodies. 　　Part Thirteen: Disposal of Waste Nature of the waste: Methods of waste disposal: Relevant ** and local regulations should be consulted prior to disposal. Incineration is recommended as a disposal method. Sulfur oxides emitted from the incinerator are removed through a scrubber. 　　Disposal precautions: Part XIV: Transport information Hazardous goods code: 32111 UN number: 2412 Packaging mark: Packaging category: O52 Packaging method: Steel drum with small opening ； Ordinary wooden box outside the ampoule bottle ； Plain wooden box outside a threaded-mouth glass bottle, an iron-cap pressed-mouth glass bottle, a plastic bottle, or a metal drum/tank. 　　Transportation precautions: The transport vehicle should be equipped with appropriate types and quantities of fire-fighting equipment as well as emergency response devices for leaks during transportation. It is best to transport in the early morning and evening during summer. The tank trucks used for transportation should be equipped with grounding chains, and perforated partitions can be installed inside the tanks to reduce static electricity generated by vibrations. Mixing or transporting it together with oxidizers and similar substances is strictly prohibited. During transportation, it should be protected from exposure to sunlight and rain, as well as high temperatures. When making stops en route, stay away from sources of fire, heat, and high temperatures. The exhaust pipes of the vehicles used to transport this item must be equipped with flame arrestors, and the use of mechanical equipment and tools that may generate sparks for loading and unloading is prohibited. When transporting by road, follow the designated routes and do not stop in residential areas or densely populated zones. Sliding is prohibited during railway transportation. Bulk transportation by wooden boats or concrete boats is strictly prohibited.

It’s an organic substance; can 3# be used? ? ?

May I ask the original poster, **how is the market for thiophene currently?

The poster can consider using Tank 1, as it can protect against poisonous smoke and fumes.

Personally, I think to use #3 organic-filtrating respirators at low concentrations, and air respirators at high concentrations.