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Chemical Name:
NSC 24145;usafst-40;USAF st-40;CH2C(CH3)CN;2-Cyanopropene;Isobutenenitrile;Methacrylnitrile;2-Cyanopropene-1;isopropenecyanide;METHACRYLONITRILE
Molecular Formula:
Formula Weight:
MOL File:

Methacrylonitrile Properties

Melting point:
−35.8 °C(lit.)
Boiling point:
90-92 °C(lit.)
0.8 g/mL at 25 °C(lit.)
vapor pressure 
64 mm Hg ( 20 °C)
refractive index 
n20/D 1.400(lit.)
Flash point:
54 °F
storage temp. 
Water Solubility 
2.57 g/100 mL (20 ºC)
CAS DataBase Reference
126-98-7(CAS DataBase Reference)
NIST Chemistry Reference
2-Propenenitrile, 2-methyl-(126-98-7)
EPA Substance Registry System
2-Propenenitrile, 2-methyl-(126-98-7)


Hazard Codes  F,T
Risk Statements  11-23/24/25-43
Safety Statements  9-16-18-29-45
RIDADR  UN 3079 3/PG 1
WGK Germany  1
RTECS  UD1400000
HazardClass  3.1
PackingGroup  I
HS Code  29269095
Hazardous Substances Data 126-98-7(Hazardous Substances Data)
Toxicity LD50 orally in rats: 0.25 ml/kg (Smyth)

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Methacrylonitrile Chemical Properties,Uses,Production

Chemical Properties


Chemical Properties

Methylacrylonitrile is a colorless liquid with an odor like bitter almonds. It is reported that methacrylonitrile cannot be detected by its smell even at concentrations which are already dangerous for humans. Hence, special attention must be given to ventilation and estimations of the amount of poison present must be carried out frequently.


This study reports the toxicity and metabolism of Methacrylonitrile (MeAN) in normal male Sprague-Dawley rats and those pre-treated with caffeine, alcohol or both. These results suggest that caffeine inhibited and alcohol enhanced toxicity and metabolism of MeAN.


In preparation of homopolymers and copolymers; as an intermediate in the preparation of acids, amides, amines, esters, nitriles.

General Description

A clear colorless liquid. Less dense than water. Flash point 55°F. Boiling point 195°F. Very be toxic by ingestion, inhalation and skin absorption. Used to make plastics and coatings.

Air & Water Reactions

Highly flammable. Soluble in water.

Reactivity Profile

METHACRYLONITRILE is a colorless, flammable, toxic liquid. Explosive in the form of vapor when exposed to heat, flame or sparks. When heated to decomposition Methacrylonitrile emits toxic fumes of nitrile and oxides of nitrogen [Lewis, 3rd ed., 1993, p. 829].


Flammable. Toxic by ingestion, inhalation, and skin absorption.

Health Hazard

A lacrimator (causes tearing); an insidious poison which causes delayed skin reactions. Very readily absorbed through skin. Highly toxic.

Fire Hazard

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. Hazardous polymerization may occur.

Safety Profile

Poison by ingestion, inhalation, skin contact, and intraperitoneal routes. An eye irritant. A dangerous fire hazard when exposed to heat, flame, or sparks. When heated to decomposition it emits toxic fumes of NOx and CN-. See also NITRILES.

Potential Exposure

This material is used as a monomer in the preparation of polymeric coatings and elastomers

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, including resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medical attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24 to 48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a qualified medical professional might consider administering a corticosteroid spray. Cigarette smoking may exacerbate pulmonary injury and should be discouraged for at least 72 hours following exposure. If symptoms develop or overexposure is suspected, chest X-ray should be considered.


UN3079 Methacrylonitrile, stabilized, Labels: 6.1; Hazard class: 6.1, 3-Flammable liquid, Inhalation Hazard Zone B.

Purification Methods

Wash it with saturated aqueous NaHSO3 (to remove inhibitors such as p-tert-butylcatechol), 1% NaOH in saturated NaCl and then with saturated NaCl. Dry it with CaCl2 and fractionally distil it under nitrogen to separate it from impurities such as methacrolein and acetone. [Beilstein 2 IV 1539.]


May form explosive mixture with air. Methacrylonitrile evolves flammable concentrations of vapor at temperatures down to 12.8C. Thus, at room temperatures, flammable concentrations are liable to be present. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides, aliphatic amines, alkanolamines, alkali, and light. Heat sensitive; polymerization may occur due to elevated temperature, visible light, or contact with a concentrated alkali. Note: Typically contains 50 pm of monoethyl ether hydroquinone (662-62-8) as an inhibitor to prevent polymerization.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform to EPA regulations governing storage, transportation, treatment, and waste disposal. Add alcoholic NaOH, then oxidize with sodium hypochlorite. After reaction, flush to sewer with water

Methacrylonitrile Preparation Products And Raw materials

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Methacrylonitrile Spectrum

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