Dicyandiamide (CAS No. 461‑58‑5; formula C₂H₄N₄; MW ≈ 84.08 g/mol) is a white crystalline powder, melting at ~208–211 °C, soluble in water, alcohol, and polar solvents. With industrial purity around ≥ 99%, it functions as a hardener, curing agent, fertilizer additive, and fine chemical intermediate.