Safety Data Sheet for Sodium Hydroxide Solution (Lye)

1. Physical and chemical constants of the substance: National standard code 82001; CAS number 1310-73-2. Chinese name: Sodium hydroxide; English name: Sodium hydro*de； Caustic soda is also known as sodium hydroxide ； caustic soda ； Caustic soda ； The molecular formula of solid alkali is NaOH. Its appearance and properties are those of a white, opaque solid that is prone to deliquescence. Its molecular weight is 40.01, its vapor pressure is 0.13 kPa at 739°C, its melting point is 318.4°C, and its boiling point is 1390°C. It is soluble in water, ethanol, and glycerin, but insoluble in propane. Its relative density (with water as reference) is 2.12. It is stable. The hazard symbol is 20 (alkaline corrosive substance). Its main uses include the soap industry, oil refining, papermaking, rayon production, dyeing, leather processing, pharmaceuticals, and organic synthesis. 2. Impact on the environment: I. Health hazards; Routes of exposure: inhalation, ingestion. Health hazards: This product is highly irritating and corrosive. Dust or smoke irritates the eyes and respiratory tract, and corrodes the nasal septum ； Direct contact with the skin and eyes can cause burns ； Accidental ingestion can cause burns to the digestive tract, mucosal erosion, bleeding, and shock. II. Toxicological data and environmental behavior: Hazardous characteristics: This product does not burn; it releases large amounts of heat when in contact with water and water vapor, resulting in the formation of a corrosive solution. It undergoes a neutralization reaction with acids, releasing heat. It is highly corrosive. Combustion (decomposition) products: Harmful toxic fumes may be generated. 3. On-site emergency monitoring methods: 4. Laboratory monitoring methods: Acid-base titration method, as described in “Methods for the Determination of Hazardous Substances in Air” (2nd edition), edited by Hang Shiping; Mixed indicator colorimetry method, as described in “Methods for the Determination of Hazardous Substances in Air” (2nd edition), edited by Hang Shiping. 5. Environmental standards: In China, the maximum allowable concentration of hazardous substances in workshop air is 0.5 mg/m3. 6. Emergency response measures: I. Emergency response to leaks – Isolate the area affected by the leak and place warning signs around it. It is recommended that emergency responders wear gas masks and chemical protective clothing. Do not come into direct contact with the spill; use a clean shovel to collect it in a dry, clean container with a lid. Add it to large amounts of water in small quantities to adjust the pH to neutral, and then dispose of it in the wastewater system. It can also be rinsed with a large amount of water, and the diluted rinse water is discharged into the wastewater system. In the event of a large-scale spill, collect it, recycle it, or dispose of it after rendering it harmless. II. Protective Measures: Respiratory protection: Wear a gas mask if necessary. Eye protection: Wear chemical safety goggles. Protective clothing: Wear work clothes (made of corrosion-resistant materials). Hand protection: Wear rubber gloves. Other: Take a shower after work**. Pay attention to personal hygiene. III. First aid measures: Skin contact: Immediately rinse with water for at least 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. Or rinse with a 3% boric acid solution. Seek medical attention. Inhalation: Quickly move to a place with fresh air. Perform artificial respiration if necessary. Seek medical attention. Ingestion: The patient should rinse their mouth immediately while awake, take diluted vinegar or lemon juice orally, and seek medical attention. Fire extinguishing method: fogged water, sand.