- Methacrylonitrile, inhibited
- Isopropene cyanide
Clear, colorless liquid, odor similar to bitter almonds.
In the preparation of homopolymers and copolymers, as an intermediate in prepn of acids, amides, amines, esters, nitriles.
Registry Numbers and Inventories.
EC Index Number
Highly flammable; Toxic; Sensitising; Dangerous for the Environment
R 11 23/24/25 43 51/53
S 9 16 18 29 45 61
Tumorigen; Reproductive Effector; Primary Irritant
Swiss Giftliste 1
Japan ENCS (MITI)
Melting point, °C
Boiling point, °C
90 - 92
Vapor pressure, mmHg
56 (25 C)
Vapor density (air=1)
8.5% at 20 C
Odor Threshold Odor threshold 2.1 ppm
0.8001 g/cm3 (20 C)
Solubility in water
28.9 g/L (0 C)
0.392 cp (20 C)
24.4 g/s2 (20 C)
1.4007 (20 C)
Partition coefficient, pKow
Heat of vaporization
Hazards and Protection.
Keep away from heat, sparks, and flame. Keep away from sources of ignition. Store in a cool, dry, well-ventilated area away from incompatible substances. Flammables-area. Refrigerator/flammables. Keep containers tightly closed.
D1A B2 D2B
Wash thoroughly after handling. Use only in a well ventilated area. Ground and bond containers when transferring material. Avoid contact with eyes, skin, and clothing. Avoid contact with skin and eyes. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Avoid contact with heat, sparks and flame. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
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. Clean up spills immediately, using the appropriate protective equipment. Remove all sources of ignition. Use a spark-proof tool. A vapor suppressing foam may be used to reduce vapors.
Stable under normal temperatures and pressures. When heated to decompostion cyanide fumes are released.
Strong oxidizing agents, strong reducing agents, strong acids, strong bases, chlorates, nitrates.
Nitrogen oxides, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide, nitrogen, cyanides.
Upper exp. limit, %
Lower exp. limit, %
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extinguishing media: For small fires, use dry chemical, carbon dioxide, water spray or alcohol-resistant foam. For large fires, use water spray, fog, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Water may be ineffective. Do NOT use straight streams of water.
Extremely flammable liquid and vapor. Containers may explode in the heat of a fire. Will be easily ignited by heat, sparks or flame.
Methacrylonitrile evolves flammable concentrations of vapor at temperatures down to 55.04F. Thus, at room temperatures, flammable concentrations are liable to be present. Toxic fumes of nitrogen oxides are released when the material burns. Also, the chemical will explode due to its tendency to polymerize violently. Avoid heat.
Fire will produce irritating, corrosive and/or toxic gases.
TLV: 1 ppm; 2.7 mg/m3 (as TWA) (skin) (ACGIH 1994-1995).
Headache, CNS depression, coma, and convulsions may develop. No data were available to assess the teratogenic potential of this agent. <br>No data were available to assess the potential effects of exposure to this agent during pregnancy or lactation.
Harmful if swallowed. May cause irritation of the digestive tract.
Harmful if inhaled. Causes respiratory tract irritation. May be fatal if exposed to high concentrations. Vapors may cause dizziness or suffocation.
Causes skin irritation. Harmful if absorbed through the skin. May cause skin sensitization, an allergic reaction, which becomes evident upon re-exposure to this material. Substance is readily absorbed through the skin.
Causes eye irritation. Lachrymator.
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. Severe acute inhalations should be treated like cyanide poisoning.
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.