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Hazard Predictions

• Generates gas: Reaction liberates gaseous products and may cause pressurization
• Intense or explosive reaction: Reaction may be particularly intense, violent, or explosive
• Toxic: Reaction products may be toxic

Isocyanates react spontaneously with many acidic compounds at room temperature (Richter, R.H., R.D. Priester Jr. 2000. Isocyanates, Organic. In Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. (Online)).

Nitric acid can react explosively with inorganic thiocyanates (MCA Case History No. 853, Case Histories of Accidents in the Chemical Industry, Washington, Manufacturing Chemists' Association).

Sodium thiocyanate reacts violently with H2SO4, evolving toxic and flammable carbonyl sulfide gas (Meyer, E., Chemistry of Hazardous Materials, Englewood Cliffs (NJ), Prentice-Hall, 1977, pp. 39.).

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). It is assumed other strong acids may have a similar effect.

Potential Gas Byproducts

• Carbonyl Sulfide (COS)
• Isocyanic Acid (HNCO)