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Hazard Predictions

• Corrosive: Reaction products may be corrosive
• 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)
• Toxic: Reaction products may be toxic

Isocyanates react readily with acids at room temperature (Richter, Reinhard H., Ralph D. Priester Jr. 2000. Isocyanates, Organic. In Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. (Online)).

Potassium or sodium cyanate may react with stearic or oxalic acid in dry anhydrous conditions to liberate toxic HNCO gas (Fischer, G., Geith, J., Klapstke, T. M., And Krumm, B. Z. Naturforsch: "Synthesis, Properties and Dimerization Study of Isocyanic Acid" 57 b, 19-24 (2002).

Inorganic acids may liberate toxic H2S, and HCN gases upon exposure to isocyanates and isothiocyanates (Predicted).

Acids may release toxic HCN gas when mixed with isocyanates or isothiocyanate. May also produce flammable and toxic H2S gas with isothiocyanates (Predicted).

Potential Gas Byproducts

• Hydrogen Sulfide (H2S)
• Hydrogen Cyanide (HCN)
• Isocyanic Acid (HNCO)