Methacrylic acid

  • Methacrylic acid, inhibited
  • 2-Methylpropenoic acid
  • alpha-Methylacrylic acid
Formula
C4H6O2
Structure
Description
Colorless liquid or solid with an acrid, repulsive odor.
Uses
Manufacture of methacrylate resins & plastics.

Registry Numbers and Inventories.
CAS
79-41-4
EC (EINECS/ELINCS)
201-204-4
EC Index Number
607-088-00-5
EC Class
Harmful; Corrosive
R 21/22 35
S 26 36/37/39 45
RTECS
OZ2975000
RTECS class
Drug; Mutagen; Human Data
UN (DOT)
2531
Merck
13,5967
Beilstein/Gmelin
1719937
Beilstein Reference
4-02-00-01518
Swiss Giftliste 1
G-5958
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C4H6O2
Formula mass
86.09
Melting point, °C
15
Boiling point, °C
163
Vapor pressure, mmHg
1.23 (25 C)
Vapor density (air=1)
2.97
Saturation Concentration
0.09% at 20 C
Critical temperature
361
Critical pressure
45.9
Density
1.02 g/cm3 (20 C)
Solubility in water
90 g/L (20 C)
Viscosity
1.4 mPa (20 C))
Refractive index
1.42815 (20 C)
pKa/pKb
4.65 (pKa)
Partition coefficient, pKow
0.93
Heat of vaporization
42.28 kJ/mol
Heat of combustion
-2017 kJ/mol

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
E D1B
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate chemical protective gloves, boots and goggles. If contact with the material anticipated, wear appropriate chemical protective clothing.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Apply water spray or mist to knock down vapors. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash or cement powder. Water spill: Use natural barriers or oil spill control booms to limit spill travel. Remove trapped material with suction hoses.
Disposal code
4
Stability
Stable only if stored and handled under recommended conditions. The stability of the product depends upon the availability of both dissolved oxygen and MEHQ inhibitor(CAS=150-76-5). The presence of oxygen is necessary for the MEHQ to function effectively. The product should never be stored under an inert gas atmosphere, but should always be stored under an atmosphere containing 5-21% oxygen by volume.
Incompatibilities
Strong oxidizing agents and hydrochloric acid.
Decomposition
When heated to decomposition, it emits acrid smoke and irritating fumes.

Fire.
Flash Point,°C
76
Autoignition, °C
370
Upper exp. limit, %
8.7
Lower exp. limit, %
1.6
Fire fighting
Extinguish fire using agent suitable for type of surrounding fire. (Material itself does not burn or burns with difficulty.) Use dry chemical, dry sand, or carbon dioxide. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Combustible liquid and vapor.
Hazards
When heated, vapors may form explosive mixtures with air: indoors, outdoors, and sewers explosion hazards. May polymerize explosively when heated or involved in a fire. Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated. Runoff may pollute waterways. Substance may be transported in a molten form.
Combustion products
Vapor forms explosive mixtures with air.
Health
3
 
Flammability
2
 
 
Reactivity
2
 

Health.
Exposure limit(s)
TLV: 20 ppm; 70 mg/m3 (ACGIH 1995-1996). NIOSH REL: TWA 20 ppm (70 mg/m3) skin
Poison_Class
2
Exposure effects
No data were available to assess the possible reproductive hazard of this agent. However, methacrylic acid has been shown to be teratogenic in the rat. <br>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.
   Ingestion
May cause burns to the digestive tract. May be harmful if swallowed,
   Inhalation
Causes chemical burns to the respiratory tract.
   Skin
Harmful if absorbed through the skin. Causes skin burns.
   Eyes
Causes eye burns.

First aid
 
   Ingestion
DO NOT INDUCE VOMITING. Corrosive chemicals will destroy the membranes of the mouth, throat, and esophagus and, in addition, have a high risk of being aspirated into the victim's lungs during vomiting which increases the medical problems. If the victim is conscious and not convulsing, give 1 or 2 glasses of water to dilute the chemical and IMMEDIATELY call a hospital or poison control center. IMMEDIATELY transport the victim to a hospital. If the victim is convulsing or unconscious, do not give anything by mouth, ensure that the victim's airway is open and lay the victim on his/her side with the head lower than the body. DO NOT INDUCE VOMITING. Transport the victim IMMEDIATELY to a hospital.
   Inhalation
IMMEDIATELY leave the contaminated area; take deep breaths of fresh air. IMMEDIATELY call a physician and be prepared to transport the victim to a hospital even if no symptoms (such as wheezing, coughing, shortness of breath, or burning in the mouth, throat, or chest) develop. Provide proper respiratory protection to rescuers entering an unknown atmosphere. Whenever possible, Self-Contained Breathing Apparatus (SCBA) should be used.
   Skin
IMMEDIATELY flood affected skin with water while removing and isolating all contaminated clothing. Gently wash all affected skin areas thoroughly with soap and water. IMMEDIATELY call a hospital or poison control center even if no symptoms (such as redness or irritation) develop. IMMEDIATELY transport the victim to a hospital for treatment after washing the affected areas.
   Eyes
First check the victim for contact lenses and remove if present. Flush victim's eyes with water or normal saline solution for 20 to 30 minutes while simultaneously calling a hospital or poison control center. Do not put any ointments, oils, or medication in the victim's eyes without specific instructions from a physician. IMMEDIATELY transport the victim after flushing eyes to a hospital even if no symptoms (such as redness or irritation) develop.

Transport.
UN number
2531
Response guide
Hazard class
8
Packing Group
II
 
USCG CHRIS Code
MAD
 
HS Code
2916 13 00
 
Std. Transport #
4930251
 
IMO Chemical Code
17
IMO Pollution Category
D
IMO Hazard code
S