Methacrylic acid

Methacrylic acid
Names
	IUPAC name Methacrylic acid
	Preferred IUPAC name 2-Methylprop-2-enoic acid
	Other names Methacrylic acid; 2-Methyl-2-propenoic acid; α-Methacrylic acid; 2-Methylacrylic acid; 2-Methylpropenoic acid
Identifiers
CAS Number	79-41-4 ;
3D model (JSmol)	Interactive image;
Abbreviations	MAA
ChEBI	CHEBI:25219 ;
ChemSpider	3951 ;
ECHA InfoCard	100.001.096
EC Number	201-204-4;
MeSH	C008384
PubChem CID	4093;
UNII	1CS02G8656 ;
CompTox Dashboard (EPA)	DTXSID3025542 ;
	InChI InChI=1S/C4H6O2/c1-3(2)4(5)6/h1H2,2H3,(H,5,6) Key: CERQOIWHTDAKMF-UHFFFAOYSA-N;
	SMILES CC(C(O)=O)=C;
Properties
Chemical formula	C4H6O2
Molar mass	86.09 g/mol
Appearance	Colorless liquid
Odor	Acrid, repulsive
Density	1.015 g/cm3
Melting point	14 to 15 °C (57 to 59 °F; 287 to 288 K)
Boiling point	161 °C (322 °F; 434 K)
Solubility in water	9% (25 °C)
Vapor pressure	0.7 mmHg (20 °C)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H312, H314
Precautionary statements	P260, P264, P270, P280, P301+P317, P301+P330+P331, P302+P352, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P330, P362+P364, P363, P405, P501
NFPA 704 (fire diamond)	3 2 2
Flash point	77.2 °C (171.0 °F; 350.3 K)
	NIOSH (US health exposure limits):
PEL (Permissible)	none
REL (Recommended)	TWA 20 ppm (70 mg/m3) [skin]
IDLH (Immediate danger)	N.D.
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Methacrylic acid, abbreviated MAA, is an organic compound with the formula CH₂=C(CH₃)CO₂H. This colorless, viscous liquid is a carboxylic acid with an acrid unpleasant odor. It is soluble in warm water and miscible with most organic solvents. Methacrylic acid is produced industrially on a large scale as a precursor to its esters, especially methyl methacrylate (MMA), and to poly(methyl methacrylate) (PMMA).