Methacrylic Acid

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  • Identifiers

    CAS number
    79-41-4

    Molecular formula
    C4H6O2

    SMILES
    CC(=C)C(=O)O

    Safety labels

    Corrosive
    Corrosive

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Pungent 59.42%
    Caramellic 51.34%
    Sharp 51.3%
    Sour 49.73%
    Burnt 43.61%
    Odorless 32.3%
    Sweet 27.92%
    Buttery 27.88%
    Spicy 27.36%
    Ethereal 25.08%

     

    Flavor
    Phenolic 30.87%
    Nutty 30.64%
    Odorless 28.25%
    Caramel 27.09%
    Sweet 26.49%
    Dry 24.31%
    Sour 23.92%
    Caramellic 23.03%
    Pungent 22.62%
    Acetoin 21.79%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    0.9

    pKa est.
    7.48 (neutral)

    Molecular weight
    86.09 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Fast

    Melting point expt.

    • 61 °F (NTP, 1992)
    • 61 °F (NIOSH, 2024)
    • 16 °C
    • 61 °F

    Boiling point

    • 325 °F at 760 mmHg (NTP, 1992)
    • 325 °F at 760 mmHg (NIOSH, 2024)
    • 163 °C at 760 mm Hg
    • 159-163 °C
    • 325 °F

    Flash point

    • 63.64 ˚C est.
    • 170 °F (NTP, 1992)
    • 171 °F (NIOSH, 2024)
    • 77 °C
    • 76 °C (open cup)
    • 153 °F (67 °C) (closed cup)
    • 68 °C c.c., 77 °C o.c.
    • 171 °F (open-cup)
    • (oc) 171 °F

    Solubility expt.

    • greater than or equal to 100 mg/mL at 63 °F (NTP, 1992)
    • 9 % at 77 °F (NIOSH, 2024)
    • Soluble in chloroform; miscible with ethanol, ether
    • In water solubility, 89 g/L at 20 °C
    • Solubility in water, g/l at 20 °C: 98 (soluble)
    • (77 °F): 9%

  • Synonyms

    • METHACRYLIC ACID
    • 79-41-4
    • 2-methylprop-2-enoic acid
    • 2-Methylacrylic acid
    • 2-Propenoic acid, 2-methyl-
    • Methylacrylic acid
    • 2-Methylpropenoic acid
    • 2-Methyl-2-propenoic acid
    • alpha-Methylacrylic acid
    • 2-Methylenepropionic acid
    • alpha-Methacrylic acid
    • Propionic acid, 2-methylene-
    • Acrylic acid, 2-methyl-
    • Kyselina methakrylova
    • Methacrylsaeure
    • Methakrylsaeure
    • Acido metacrilico
    • Acide methacrylique
    • 2-Methylpropensaeure
    • NSC 7393
    • CCRIS 5925
    • HSDB 2649
    • a-methacrylic acid
    • EINECS 201-204-4
    • BRN 1719937
    • DTXSID3025542
    • UNII-1CS02G8656
    • CHEBI:25219
    • 2-Methyl-acrylic acid
    • AI3-15724
    • METHACRYLIC AC ID
    • NSC-7393
    • .alpha.-Methacrylic acid
    • .alpha.-Methylacrylic acid
    • 1CS02G8656
    • DTXCID505542
    • NSC7393
    • EC 201-204-4
    • 4-02-00-01518 (Beilstein Handbook Reference)
    • 2-Methacrylic Acid
    • Propenoic acid, 2-methyl
    • Acido metacrilico [Spanish]
    • Acide methacrylique [French]
    • Kyselina methakrylova [Czech]
    • UN2531
    • Methacrylic acid (glacial)
    • Methacrylic acid (inhibited)
    • Methyl acrylic acid
    • MFCD00002651
    • No Lift Nails Primer
    • Methacrylic acid glacial
    • CH2=C(CH3)COOH
    • Methacrylic acid, inhibited
    • propenoic acid, 2-methyl-
    • Methacrylic acid, stabilized
    • WLN: QVY1&U1
    • UN 2531 (Salt/Mix)
    • METHACRYLIC ACID [MI]
    • METHACRYLIC ACID [HSDB]
    • CHEMBL1213531
    • METHACRYLIC ACID [WHO-DD]
    • STR02118
    • Tox21_200826
    • BBL011616
    • GE 110
    • STL163339
    • PROPENIONIC ACID, 2-METHYLENE
    • AKOS000121138
    • CAS-79-41-4
    • Methacrylic acid, inhibited (Salt/Mix)
    • NCGC00248843-01
    • NCGC00258380-01
    • BP-30227
    • BP-31229
    • DB-240386
    • M0079
    • NS00010058
    • EN300-24829
    • G77235
    • Methacrylic acid, SAJ first grade, >=98.0%
    • Q165949
    • Methacrylic acid, inhibited [UN2531] [Corrosive]
    • Methacrylic acid, contains 250 ppm MEHQ as inhibitor
    • InChI=1/C4H6O2/c1-3(2)4(5)6/h1H2,2H3,(H,5,6
    • Methacrylic acid, contains 250 ppm MEHQ as inhibitor, 99%
    • 201-204-4
    • 25068-55-7
    • 50867-57-7

  • Applications

    Methacrylic Acid (CAS 79-41-4) is primarily used as a monomer for poly(methacrylate) resins such as PMMA, enabling the production of transparent plastics, optical-quality components, and coatings; it also serves as a feedstock to synthesize common methacrylate esters (e.g., ethyl methacrylate and hydroxyethyl methacrylate) used in coatings, inks, adhesives, and dental materials; it is a key precursor for UV-curable coatings and 3D-printing resins; it supports dental and medical materials based on methacrylate polymers; and its carboxyl functionality allows integration into specialty polymers, sealants, and adhesive systems to improve bonding.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 84.53
    methanol 109.8
    isopropanol 49.44
    water 119.68
    ethyl acetate 11.69
    n-propanol 49.61
    acetone 18.23
    n-butanol 42.41
    acetonitrile 11.23
    DMF 52.52
    toluene 1.97
    isobutanol 41.79
    1,4-dioxane 27.16
    methyl acetate 15.77
    THF 34.46
    2-butanone 17.69
    n-pentanol 35.85
    sec-butanol 52.85
    n-hexane 2.35
    ethylene glycol 55.57
    NMP 62.4
    cyclohexane 0.96
    DMSO 38.45
    n-butyl acetate 7.68
    n-octanol 20.97
    chloroform 7.58
    n-propyl acetate 8.34
    acetic acid 87.51
    dichloromethane 6.89
    cyclohexanone 16.2
    propylene glycol 60.41
    isopropyl acetate 9.97
    DMAc 66.08
    2-ethoxyethanol 76.72
    isopentanol 47.79
    n-heptane 1.59
    ethyl formate 16.87
    1,2-dichloroethane 5.04
    n-hexanol 25.82
    2-methoxyethanol 101.84
    isobutyl acetate 6.13
    tetrachloromethane 4.4
    n-pentyl acetate 13.36
    transcutol 105.38
    n-heptanol 29.13
    ethylbenzene 2.91
    MIBK 15.98
    2-propoxyethanol 47.35
    tert-butanol 74.4
    MTBE 25.81
    2-butoxyethanol 54.64
    propionic acid 42.58
    o-xylene 3.94
    formic acid 127.89
    diethyl ether 10.86
    m-xylene 3.35
    p-xylene 3.9
    chlorobenzene 2.41
    dimethyl carbonate 8.03
    n-octane 1.09
    formamide 120.24
    cyclopentanone 24.29
    2-pentanone 15.4
    anisole 9.82
    cyclopentyl methyl ether 15.44
    gamma-butyrolactone 29.93
    1-methoxy-2-propanol 71.48
    pyridine 9.05
    3-pentanone 8.69
    furfural 31.86
    n-dodecane 0.82
    diethylene glycol 56.57
    diisopropyl ether 5.68
    tert-amyl alcohol 87.73
    acetylacetone 15.74
    n-hexadecane 0.81
    acetophenone 11.96
    methyl propionate 12.01
    isopentyl acetate 10.43
    trichloroethylene 8.81
    n-nonanol 18.47
    cyclohexanol 20.4
    benzyl alcohol 15.9
    2-ethylhexanol 16.15
    isooctanol 25.64
    dipropyl ether 5.87
    1,2-dichlorobenzene 3.41
    ethyl lactate 11.87
    propylene carbonate 19.26
    n-methylformamide 43.09
    2-pentanol 32.05
    n-pentane 2.03
    1-propoxy-2-propanol 29.83
    1-methoxy-2-propyl acetate 13.72
    2-(2-methoxypropoxy) propanol 46.45
    mesitylene 3.1
    ε-caprolactone 21.93
    p-cymene 3.7
    epichlorohydrin 25.94
    1,1,1-trichloroethane 5.52
    2-aminoethanol 89.67
    morpholine-4-carbaldehyde 60.48
    sulfolane 38.52
    2,2,4-trimethylpentane 3.33
    2-methyltetrahydrofuran 29.35
    n-hexyl acetate 18.73
    isooctane 2.18
    2-(2-butoxyethoxy)ethanol 62.38
    sec-butyl acetate 7.45
    tert-butyl acetate 17.0
    decalin 1.49
    glycerin 81.56
    diglyme 78.15
    acrylic acid 38.3
    isopropyl myristate 6.94
    n-butyric acid 39.49
    acetyl acetate 7.92
    di(2-ethylhexyl) phthalate 12.9
    ethyl propionate 7.52
    nitromethane 49.25
    1,2-diethoxyethane 15.17
    benzonitrile 6.26
    trioctyl phosphate 9.68
    1-bromopropane 3.47
    gamma-valerolactone 41.61
    n-decanol 13.14
    triethyl phosphate 5.98
    4-methyl-2-pentanol 28.18
    propionitrile 8.06
    vinylene carbonate 13.88
    1,1,2-trichlorotrifluoroethane 37.8
    DMS 9.12
    cumene 4.24
    2-octanol 18.07
    2-hexanone 12.55
    octyl acetate 11.0
    limonene 4.9
    1,2-dimethoxyethane 50.19
    ethyl orthosilicate 6.7
    tributyl phosphate 8.8
    diacetone alcohol 51.0
    N,N-dimethylaniline 12.96
    acrylonitrile 9.98
    aniline 8.24
    1,3-propanediol 85.24
    bromobenzene 1.55
    dibromomethane 4.52
    1,1,2,2-tetrachloroethane 9.29
    2-methyl-cyclohexyl acetate 10.51
    tetrabutyl urea 12.62
    diisobutyl methanol 10.75
    2-phenylethanol 15.43
    styrene 2.51
    dioctyl adipate 10.64
    dimethyl sulfate 14.53
    ethyl butyrate 6.76
    methyl lactate 20.63
    butyl lactate 18.44
    diethyl carbonate 4.67
    propanediol butyl ether 56.39
    triethyl orthoformate 6.46
    p-tert-butyltoluene 3.97
    methyl 4-tert-butylbenzoate 25.44
    morpholine 42.04
    tert-butylamine 34.12
    n-dodecanol 8.91
    dimethoxymethane 28.67
    ethylene carbonate 10.77
    cyrene 42.15
    2-ethoxyethyl acetate 18.76
    2-ethylhexyl acetate 7.12
    1,2,4-trichlorobenzene 4.5
    4-methylpyridine 10.05
    dibutyl ether 7.87
    2,6-dimethyl-4-heptanol 10.75
    DEF 25.67
    dimethyl isosorbide 44.61
    tetrachloroethylene 9.63
    eugenol 30.7
    triacetin 16.75
    span 80 38.82
    1,4-butanediol 48.57
    1,1-dichloroethane 4.95
    2-methyl-1-pentanol 45.69
    methyl formate 26.82
    2-methyl-1-butanol 47.89
    n-decane 1.33
    butyronitrile 10.18
    3,7-dimethyl-1-octanol 19.75
    1-chlorooctane 4.11
    1-chlorotetradecane 1.86
    n-nonane 1.26
    undecane 1.0
    tert-butylcyclohexane 2.4
    cyclooctane 0.7
    cyclopentanol 30.11
    tetrahydropyran 12.55
    tert-amyl methyl ether 26.3
    2,5,8-trioxanonane 59.33
    1-hexene 5.55
    2-isopropoxyethanol 52.97
    2,2,2-trifluoroethanol 45.74
    methyl butyrate 12.4

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction