155721 Sigma-Aldrich

Methacrylic acid

contains 250 ppm MEHQ as inhibitor, 99%

Synonym: 2-Methacrylic acid, 2-Methylpropenoic acid

  • CAS Number 79-41-4

  • Linear Formula H2C=C(CH3)COOH

  • Molecular Weight 86.09

  •  Beilstein/REAXYS Number 1719937

  •  EC Number 201-204-4

  •  MDL number MFCD00002651

  •  PubChem Substance ID 24849561

  •  NACRES NA.23



Related Categories Acrylic Acids and Salts, Acrylic Monomers, Cell Biology, Chamaemelum nobile (Chamomile tea), Materials Science,
Quality Level   200
vapor density   >3 (vs air)
vapor pressure   1 mmHg ( 20 °C)
assay   99%
autoignition temp.   752 °F
contains   250 ppm MEHQ as inhibitor
refractive index   n20/D 1.431 (lit.)
bp   163 °C (lit.)
mp   12-16 °C (lit.)
density   1.015 g/mL at 25 °C (lit.)
SMILES string   C=C(C)C(O)=O
InChI   1S/C4H6O2/c1-3(2)4(5)6/h1H2,2H3,(H,5,6)


General description

Methacrylic acid (MAA) is an organic compound, colorless, viscous liquid. It is a monofunctional methacrylayte monomer. It is soluble in warm water and miscible in most organic solvents. MAA is used as a starting material for the production of its esters, especially methyl methacrylate and poly methyl methacrylate (PMMA).


MAA is used to synthesize poly(methacrylic acid)-g-poly(ε-caprolactone) copolymers, polymeric blends with PMMA and hydroxyethyl methacrylate (HEMA)-MAA hydrogels.


18 kg in VerSA-Flow™

5, 100, 500 g in glass bottle

2, 3 kg in glass bottle

Safety & Documentation

Safety Information

Signal word 
Hazard statements 
Target organs 
Respiratory system
UN 2531 8 / PGII
WGK Germany 
Flash Point(F) 
152.6 °F - closed cup
Flash Point(C) 
67 °C - closed cup


Certificate of Analysis (COA)

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Certificate of Origin (COO)

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Protocols & Articles


Continuous Flow Manufacturing for Monomer Synthesis

High purity monomers are critical raw materials for the manufacture of ophthalmic products.  Chemical impurities, or even the variation of impurity profiles, can have negative consequences on both sa...
Yashwant S Kulkarni, Douglas Harris and Bryce P Nelson

Keywords: Building blocks, Crystallization, Fluorinations, Materials Science, Pharmaceutical, Polymer science, Reversible addition-fragmentation chain transfer polymerizations, Separation

GC Analysis of Volatiles in Purple Nitrile Gloves on SPB®-HAP after Collection/Desorption using Carbotrap® 300 Tube

From our library of Articles, Sigma-Aldrich presents GC Analysis of Volatiles in Purple Nitrile Gloves on SPB®-HAP after Collection/Desorption using Carbotrap® 300 Tube
Keywords: Air Monitoring, Chromatography, Gas chromatography, Purification

Materials for High and Low Refractive Index Coatings

Refractive index (RI or n) is of critical importance for photonics applications such as optical waveguides and ophthalmic devices. Based on their unique refractive index characteristics and good opti...
Keywords: Environmental, Positron Emission Tomography, Solar cells

Reversible Addition Fragmentation Chain Transfer (RAFT) Polymerization

RAFT (Reversible Addition Fragmentation chain Transfer) polymerization is a reversible deactivation radical polymerization (RDRP) and one of the more versatile methods for providing living characteri...
Graeme Moad, Ezio Rizzardo, and San H. Thang
Material Matters 2010, 5.1, 2.
Keywords: Biomaterials, Living polymerization, Nanotechnology, Polymerization reactions, Radical polymerization, Reversible addition-fragmentation chain transfer polymerizations, transformation

Stimuli-Responsive Materials as Intelligent Drug Delivery Systems

Amit Singh and Mansoor M. Amiji* Department of Pharmaceutical Sciences, School of Pharmacy Northeastern University, Boston, MA 02115 USA *Email:; Tel: 617-373-3137
Keywords: Absorption, Aerobic, Angiogenesis, Apoptosis, Atomic absorption spectroscopy, Cancer, Chromatin immunoprecipitation, Clinical, Deprotonations, Diseases, Electron spin resonance, Enzyme activity, Gastrointestinal, Glycolysis, Growth factors, Infrared spectroscopy, Ligands, Magnetic resonance imaging, Materials Science, Nanomaterials, Nanotubes, Pharmaceutical, Polymerization reactions, Sol-gel, transformation

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Peer-Reviewed Papers


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