Fireworks commonly used materials: characteristics of magnesium aluminium alloy powder English name Magnesium; molecular formula for A13Mg, molecular weight of 178.22.
- Physical and chemical properties. Appearance and properties: grey powder with metallic luster; Melting point: 463°C; Relative density (water = 1): 2.15; Saturated vapour pressure: 0.13 kPa (621°C); Heat of combustion: 609.7 kJ mol 1; Solubility: Stable to alkali solutions, dissolves in acids and emits hydrogen. Reacts with water.
- Health Hazards. Acute poisoning has not been seen, only slight irritation of the conjunctiva of the eyes or nasal mucosa can be seen. Inhalation may cause coughing, chest pain, etc. Oral ingestion is harmful.
- Hazardous Characteristics. Flammable. Dust and air can form explosive mixtures, dust content reaches 32.5mg / L, easy to be ignited by open flame causing an explosion. When it meets water, moisture or acid, it emits hydrogen gas and generates a lot of heat, which will ignite or explode spontaneously. In contact with oxidising agent, it will produce violent reaction.
- Emergency response to leakage. Isolate the leaking contaminated area and restrict access. Cut off sources of ignition. It is recommended that emergency personnel wear self-contained positive pressure breathing apparatus and fire protection clothing. Do not come into direct contact with the spill. Small amount of leakage: Avoid raising dust, use clean shovel to collect in dry, clean, covered containers, transfer for recycling. Large amount of leakage: cover with plastic sheet, canvas, etc., to reduce flying, remove under expert guidance.
- Fire extinguishing methods. Do not use water, halogenated hydrocarbons (e.g. 1211 extinguishing agent), sodium bicarbonate, potassium bicarbonate, etc. as extinguishing agents, but use dry sodium chloride powder, dry graphite powder, dry sodium carbonate powder, dry calcium carbonate powder, dry sand, etc. to extinguish the fire.
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