- Hydrogen cyanamide
Orthorhombic, elongated, six-sided tablets from dimethyl phthalate
Dimer (dicyandiamide) is the raw material for melamine and guanidine.
Registry Numbers and Inventories.
EC Index Number
Toxic; Harmful; Irritant; Sensitising
R 21 25 36/38 43
S 3 22 36/37 45
Agricultural Chemical and Pesticide; Drug; Reproductive Effector
Swiss Giftliste 1
Japan ENCS (MITI)
Boiling point, °C
Vapor pressure, mmHg
0.014 (25 C)
Vapor density (air=1)
1.285 g/cm3 (20 C)
Solubility in water
1.4418 (48 C)
Heat of fusion
Heat of vaporization
Heat of combustion
Hazards and Protection.
Store in a cool, dry, well-ventilated area away from incompatible substances. Refrigerator (approx 4 C). Keep containers tightly closed.
Wash thoroughly after handling. Use with adequate ventilation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation.
Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Avoid runoff into storm sewers and ditches which lead to waterways. Provide ventilation.
Stable under normal temperatures and pressures. Thermally unstable.
Strong oxidizing agents - strong reducing agents - acids - bases.
Hydrogen cyanide, nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Combustible solid. May be ignited by heat, sparks, and flame. Extinguishing media: Do NOT get water inside containers. In case of fire use dry chemical, dry sand, or carbon dioxide.
Slightly flammable. Combustion requires preheating. Moderate hazard.
Fire may produce irritating, corrosive and/or toxic gases.
TLV: ppm; 2 mg/m3 (ACGIH 1993-1994). NIOSH REL: TWA 2 mg/m3
Rapid heart rate may occur. Abnormally low blood pressure and low heart rate are rare. Headache, dizziness, fatigue, vertigo, and coma may be part of the disulfiram-like reaction.
Harmful if swallowed. Causes digestive tract irritation.
Dust is irritating to the respiratory tract.
Causes severe skin irritation. Harmful if absorbed through the skin.
Dust may cause mechanical irritation. Causes severe eye irritation.
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid immediately.
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse.
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
I; II; III