Commonly used materials for fireworks: 11. Properties of sulphur yellow

Fireworks commonly used materials: 11, the properties of sulfur yellow English name sulfur; molecular formula for S, molecular weight of 32.06.

1. Physicochemical properties. Appearance and properties: light yellow brittle crystals or powder, with a special odour; melting point: 119 ° C; boiling point: 444.6 ° C; relative density (water = 1): 2.0; critical pressure: 11.75 MPa; saturated vapour pressure: 0.13 kPa (184 ° C); the smallest ignition energy: 15 MJ; maximum explosion pressure: 0.415 MPa.
   

   Sulfur

2. Health Hazards. Because it can be partially converted to hydrogen sulphide in the intestine and absorbed, large oral doses can lead to hydrogen sulphide poisoning. The systemic toxic effects of acute hydrogen sulphide poisoning are manifested by central nervous system symptoms of headache, dizziness, weakness, vomiting, ataxia, and coma. The product may cause conjunctivitis and skin eczema. It is weakly irritating to the skin. Prolonged inhalation of sulphur dust during production generally has no significant toxic effects.
3. Hazardous properties. React violently on contact with halogens, metal powders, etc. Sulfur yellow is a bad conductor, easy to produce static charge during storage and transport, can lead to sulfur dust fire. Dust or vapour mixed with air or oxidant to form explosive mixtures.
4. Emergency response to leaks. Isolate the leaking contaminated area, restrict access, and cut off the source of ignition. Emergency response personnel are advised to wear dust masks (full face masks) and general operating overalls. Do not contact the leak directly. Small amount of leakage: Avoid raising dust, use clean shovel to collect in dry, clean and covered containers, and transfer to a safe place. Large quantity leakage: cover with plastic sheet, canvas, etc., then use non-sparking tools to collect and recycle or transport to waste disposal site for disposal.
5. Fire extinguishing methods. In case of small fire, use sand to smother it, and in case of big fire, use mist water to extinguish it. Do not direct the water stream to the molten material as this may cause a serious stream fire or violent boiling. Firefighters must wear gas masks and extinguish the fire at a safe distance and upwind.