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Hazard Predictions

• Explosive: Reaction products may be explosive or sensitive to shock or friction
• 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)
• Polymerization hazard: Polymerization reaction may become intense and may cause pressurization

Some unsaturated hydrocarbons, such as isoprene, butadiene, and styrene, polymerize at room temperature on contact with sodium having a high surface area (powder or a thin layer) (Pascal, P. 1966. Nouveau Trait茅 de Chimie Min茅rale. Vol. 2, Part 1, p. 224. Masson et Cie.).

Potassium reacts with acetylene even at cold temperatures to form reactive potassium carbide (K2C2) and possibly hydrogen gas. When this reaction is warmed, it results in a fire (Pascal, P. 1966. Nouveau Trait茅 de Chimie Min茅rale. Vol. 2, Part 2, p. 31. Masson et Cie.).

Heated potassium reacts with ethylene to form potassium carbide (K2C2) and possibly hydrogen gas (Pascal, P. 1966. Nouveau Trait茅 de Chimie Min茅rale. Vol. 2, Part 2, p. 31. Masson et Cie.).

Heated lithium reacts incandescently with ethylene and acetylene, forming explosive lithium carbide (Li2C2) and pyrophoric lithium hydride (Pascal, P. 1966. Nouveau Trait茅 de Chimie Min茅rale. Vol. 2, Part 1, p. 38, 137. Masson et Cie.).

Liquid potassium ignites and explodes in acetylene (Berthelot, M. 1866. Bull. Soc. Chim. (France) [2] 5:188).

Liquid sodium reacts with acetylene to form reactive sodium carbide (Na2C2) and sodium acetylide (NaC2H) and flammable hydrogen gas (Pascal, P. 1966. Nouveau Trait茅 de Chimie Min茅rale. Vol. 2, Part 1, p. 224, 867. Masson et Cie.).

Potential Gas Byproducts

• Hydrogen (H2)
• Hydrocarbons