NIOSH logo and tagline

Methacrylic acid

Related Pages
Synonyms & Trade Names
α-Methacrylic acid, Methacrylic acid (glacial), Methacrylic acid (inhibited), 2-Methylacrylic acid, 2-Methylpropenoic acid
CAS No.
79-41-4
RTECS No.
OZ2975000
DOT ID & Guide
2531 153P(inhibited)
Formula
CH₂=C(CH₃)COOH
Conversion
1 ppm = 3.52 mg/m3
IDLH
N.D.
See: IDLH INDEX
Exposure Limits
NIOSH REL
TWA 20 ppm (70 mg/m3) [skin]
OSHA PEL
none See Appendix G
Measurement Methods
OSHA PV2005
See: NMAM or OSHA Methods
Physical Description
Colorless liquid or solid (below 61°F) with an acrid, repulsive odor.
Molecular Weight
86.1
Boiling Point
325°F
Freezing Point
61°F
Solubility
(77°F): 9%
Vapor Pressure
0.7 mmHg
Ionization Potential
?
Specific Gravity
1.02 (Liquid)
Flash Point
(oc) 171°F
Upper Explosive Limit
?
Lower Explosive Limit
?
Class IIIA Combustible Liquid: Fl.P. at or above 140°F and below 200°F.
Incompatibilities & Reactivities
Oxidizers, elevated temperatures, hydrochloric acid [Note: Typically contains 100 ppm of the monomethyl ether of hydroquinone to prevent polymerization.]
Exposure Routes
inhalation, skin absorption, ingestion, skin and/or eye contact
Symptoms
irritation eyes, skin, mucous membrane; eye, skin burns
Target Organs
Eyes, skin, respiratory system
Personal Protection/Sanitation
(See protection codes)
Skin:Prevent skin contact
Eyes:Prevent eye contact
Wash skin:When contaminated
Remove:When wet or contaminated
Change:Daily
Provide:Eyewash, Quick drench
First Aid
(See procedures)
Eye:Irrigate immediately
Skin:Water flush immediately
Breathing:Respiratory support
Swallow:Medical attention immediately
Respirator Recommendations

Not available.

Important additional information about respirator selection

See also
INTRODUCTION   ICSC CARD: 0917
Page last reviewed: October 30, 2019
Content source: National Institute for Occupational Safety and Health