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Hazard Predictions

• Flammable: Reaction products may be flammable
• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Generates heat: Exothermic reaction at ambient temperatures (releases heat)
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Toxic: Reaction products may be toxic

Calcium carbide reacts on contact with acids or acid fumes, with evolution of heat or flammable vapors. There is a moderate explosive hazard (Lewis, R.J., Sr. 2004. Sax's Dangerous Properties of Industrial Materials, 11th Edition. New York: John Wiley & Sons, pp. 669).

Phosphides are particularly dangerous because they tend to decompose to the very toxic and flammable phosphine gas upon contact with moisture or acids. There is a moderate explosion hazard (Lewis, R.J., Sr. 2004. Saxs Dangerous Properties of Industrial Materials, 11th Edition. New York: John Wiley & Sons, pp. 2945).

Calcium silicide reacts with acids to evolve self-igniting silane gases (Lewis, R.J., Sr. 2004. Saxs Dangerous Properties of Industrial Materials, 11th Edition. New York: John Wiley & Sons, pp. 680).

Potential Gas Byproducts

• Hydrocarbons
• Ammonia (NH3)
• Phosphine (PH3)
• Silanes