- Methylene cyanide
A white-colored crystalline solid.
Organic synthesis, leaching agent for gold.
Registry Numbers and Inventories.
EC Index Number
Toxic; Dangerous for the Environment
R 23/24/25 50/53
S 23 27 45 60 61
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
30 - 32
Boiling point, °C
Vapor pressure, mmHg
0.13 (25 C)
Vapor density (air=1)
1.191 g/cm3 (20 C)
Solubility in water
2.85 cp (32.7 C)
47.9 g/s2 (36 C)
1.41259 (34.2 C)
Partition coefficient, pKow
Heat of fusion
Heat of vaporization
Hazards and Protection.
Store in a cool, dry, well-ventilated area away from incompatible substances. Keep containers tightly closed.
Wash thoroughly after handling. Use with adequate ventilation. Minimize dust generation and accumulation. 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.
Clean up spills immediately, using the appropriate protective equipment. Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions. Provide ventilation.
Stable under normal temperatures and pressures.
Strong oxidizing agents - strong acids - strong bases - strong reducing agents.
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.
Upper exp. limit, %
Lower exp. limit, %
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. To extinguish fire, use water, dry chemical, chemical foam, or alcohol-resistant foam.
Combustible when exposed to heat or flame.
When heated to decomposition, malononitrile emits highly toxic fumes (cyanide). May polymerize violently on prolonged heating. Avoid heat. Hazardous polymerization may occur, at prolonged heating at 266F or contact with strong bases at lower temperatures.
When heated to decomposition it emits toxic fumes of nox and cn- nitrogen oxides and cyanides.
NIOSH REL: TWA 3 ppm (8 mg/m3)
Part of the initial presentation of cyanide poisoning may be hyperpnea and rapid breathing. Hypoventilation progressing to apnea may be seen in the later phases of cyanide poisoning and is a major cause of death. Rapid heart rate and elevated blood pressure may be seen in the initial phases of cyanide poisoning. Low heart rate and abnormally low blood pressure are seen in the late phases of cyanide poisoning. When malononitrile was administered to humans intravenously for the treatment of mental illness in doses of 1 to 6 milligrams/kilogram, rapid heart rate was noted. Headache, CNS stimulation with anxiety, agitation, and combative behavior, coma, and seizures may be seen.
Harmful if swallowed. Causes digestive tract irritation.
Causes skin irritation. Harmful if absorbed through the skin.
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 immediately. 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.
USCG CHRIS Code
2926 90 95
Std. Transport #