Magnesium Oxide

Overview IFRA Request a quote

  • Identifiers

    CAS number
    1317-74-4

    Molecular formula
    MgO

    SMILES
    O=[Mg]

    Safety labels

    Irritant
    Irritant

  • Odor profile

    Fragrance
    Odorless 93.72%
    Pungent 22.77%
    Sharp 20.77%
    Burnt 16.14%
    Sour 15.87%
    Bitter 15.52%
    Ethereal 10.45%
    Caramellic 10.04%
    Fermented 9.75%
    Malty 9.41%

     

  • Properties

    pKa est.
    -8.26 (strong acid)

    Molecular weight
    40.305 g/mol

    Melting point expt.

    • 5072 °F (NIOSH, 2024)
    • 2825 °C
    • 2800 °C
    • 5072 °F

    Boiling point

    • 6512 °F at 760 mmHg (NIOSH, 2024)
    • 3,600 °C
    • 3600 °C
    • 6512 °F

    Flash point

    • -37.56 ˚C est.

    Solubility expt.

    • 0.009 % at 86 °F (NIOSH, 2024)
    • Practically insoluble in water. Insoluble in ethanol
    • Soluble in acids and ammonium salt solutions
    • Insoluble in ethanol
    • In water, 86 mg/L at 30 °C
    • Solubility in water: poor
    • (86 °F): 0.009%

  • Synonyms

    • oxomagnesium
    • Magnesia
    • Granmag
    • Calcined magnesia
    • Seawater magnesia
    • Magcal
    • Marmag
    • Magox
    • Heavy magnesium oxide
    • Calcined brucite
    • Magnesia USTA
    • Magnesium oxide fume
    • Magnezu tlenek
    • Uro-Mag
    • Magnesium oxide, heavy
    • Magnesii oxidum
    • Magnesia oxydata
    • 1317-74-4
    • Light magnesium oxide
    • Magnesium oxide heavy
    • Magnesium (as oxide)
    • Magnesium oxide, light
    • Periclase
    • MFCD00011109
    • Magnesium oxide, -325 mesh
    • 3A3U0GI71G
    • INS NO.530
    • Magnesia grooves
    • INS-530
    • Causmag
    • Maglite
    • Seasorb
    • Animag
    • Oxymag
    • Heavy magnesia
    • Light magnesia
    • BayMag
    • Maglite de
    • Magnesa preprata
    • Akro-mag
    • E-530
    • Liquimag A
    • Liquimag B
    • Caustic magnesite
    • Maglite D
    • Maglite K
    • Maglite S
    • Maglite Y
    • Magnesia monoxide
    • Anscor P
    • Hamag LP
    • Magox OP
    • FloMag HP
    • AM 2 (cement additive)
    • Fert-O-Mag
    • Kyowamag 20
    • Kyowamag 30
    • Kyowamag 40
    • Kyowamag 60
    • Elastomag 100
    • Elastomag 170
    • FloMag HP-ER
    • Kyowamag 100
    • Kyowamag 150
    • Kyowamag 150B
    • Kyowaway 150
    • Kyowaad 100
    • Luvatol MK 35
    • Magchem 100
    • Magox 85
    • Magox 90
    • Magox 95
    • Magox 98
    • Mag Chem 10
    • Mag Chem 35
    • Heavy calcined magnesia
    • Mag Chem 200AD
    • KM 3 (oxide)
    • KMACH-F
    • Mag Chem 200D
    • Magnesium Oxide (Technical Grade)
    • FMR-PC
    • Magnesium oxide, p.a., 95.0%
    • HP 10 (oxide)
    • Magmilax bolus
    • 100A (oxide)
    • Magnezu tlenek [Polish]
    • Mag Chem 10-40
    • Mag Chem 10-200
    • Mag Chem 10-325
    • Magnesium oxide substrate, 10x10x0.5mm, polished one side, 100 orientation
    • Magnesium oxide substrate, 10x10x0.5mm, polished one side, 110 orientation
    • Oxide, Magnesium
    • Periclase (MgO)
    • CCRIS 3659
    • Magnesium oxide, fume
    • HSDB 1652
    • SLO 369
    • SLO 469
    • KM 40
    • EINECS 215-171-9
    • KMB 100-200
    • Magnesium oxide [USP:JAN]
    • UNII-3A3U0GI71G
    • Magmitt
    • Maox
    • Calcined magnesite
    • Mag-Ox
    • MVT Bolus
    • Magmitt (TN)
    • INSTAMAG
    • Magnesioum oxime fume
    • Magnesium oxide, CP
    • RUMEN BOLUS
    • Magnesium oxide, 97%
    • Magnesium Oxide 400mg
    • Magnesium Oxide nanowire
    • Magnesium Oxide Dispersion
    • Magnesium Oxide Nanopowder
    • Magnesium oxide ACS Reagent
    • Nano Magnesium Oxide Powder
    • Magnesium oxide (JP17/USP)
    • Magnesium oxide, light, 95%
    • CHEMBL1200572
    • DTXCID6029624
    • Magnesium Oxide Powder, 99% Nano
    • Magnesium oxide nanopowder (20 nm)
    • Magnesium Oxide Powder, 99% Nano

  • Applications

    Magnesium Oxide (CAS 1317-74-4) is used as a high-temperature refractory material for industrial furnaces and process equipment, including steelmaking, cement, and ceramics; it serves as a component of magnesia cements and refractory linings. In ceramics and glass manufacture, MgO acts as a stabilizer and heat-resistant filler to improve thermal performance. In agriculture, MgO provides a magnesium source for soils and is used to adjust pH in acidic soils. It functions as a desiccant in packaging and as a drying agent. In water treatment, MgO is employed to neutralize acidity and adjust the pH of acidic effluents. In plastics and rubbers, MgO is used as a stabilizer and a flame retardant additive. It can also act as a support or base catalyst in industrial chemical syntheses. Subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 742.02
    methanol 1053.26
    isopropanol 474.93
    water 192.28
    ethyl acetate 120.12
    n-propanol 437.66
    acetone 305.09
    n-butanol 339.54
    acetonitrile 228.08
    DMF 970.21
    toluene 36.52
    isobutanol 246.81
    1,4-dioxane 337.81
    methyl acetate 171.0
    THF 381.11
    2-butanone 166.58
    n-pentanol 226.73
    sec-butanol 298.37
    n-hexane 22.8
    ethylene glycol 545.82
    NMP 426.4
    cyclohexane 24.51
    DMSO 660.19
    n-butyl acetate 82.99
    n-octanol 111.32
    chloroform 171.67
    n-propyl acetate 92.87
    acetic acid 604.6
    dichloromethane 163.05
    cyclohexanone 159.92
    propylene glycol 359.48
    isopropyl acetate 70.78
    DMAc 410.09
    2-ethoxyethanol 354.66
    isopentanol 208.52
    n-heptane 25.23
    ethyl formate 140.53
    1,2-dichloroethane 122.7
    n-hexanol 179.48
    2-methoxyethanol 690.29
    isobutyl acetate 54.39
    tetrachloromethane 47.91
    n-pentyl acetate 73.02
    transcutol 486.21
    n-heptanol 111.06
    ethylbenzene 20.91
    MIBK 82.69
    2-propoxyethanol 304.13
    tert-butanol 399.72
    MTBE 149.8
    2-butoxyethanol 197.7
    propionic acid 318.87
    o-xylene 33.77
    formic acid 567.21
    diethyl ether 189.21
    m-xylene 32.43
    p-xylene 25.89
    chlorobenzene 48.05
    dimethyl carbonate 85.96
    n-octane 10.93
    formamide 620.25
    cyclopentanone 237.03
    2-pentanone 137.16
    anisole 76.09
    cyclopentyl methyl ether 150.63
    gamma-butyrolactone 252.86
    1-methoxy-2-propanol 395.06
    pyridine 187.28
    3-pentanone 93.6
    furfural 241.73
    n-dodecane 10.61
    diethylene glycol 380.52
    diisopropyl ether 47.93
    tert-amyl alcohol 254.7
    acetylacetone 114.78
    n-hexadecane 10.8
    acetophenone 64.99
    methyl propionate 133.17
    isopentyl acetate 62.78
    trichloroethylene 159.7
    n-nonanol 90.23
    cyclohexanol 194.04
    benzyl alcohol 96.43
    2-ethylhexanol 82.18
    isooctanol 80.93
    dipropyl ether 90.71
    1,2-dichlorobenzene 45.79
    ethyl lactate 76.68
    propylene carbonate 116.79
    n-methylformamide 528.84
    2-pentanol 213.38
    n-pentane 38.22
    1-propoxy-2-propanol 200.18
    1-methoxy-2-propyl acetate 85.91
    2-(2-methoxypropoxy) propanol 132.7
    mesitylene 24.3
    ε-caprolactone 140.71
    p-cymene 24.71
    epichlorohydrin 225.76
    1,1,1-trichloroethane 76.44
    2-aminoethanol 588.16
    morpholine-4-carbaldehyde 455.08
    sulfolane 275.59
    2,2,4-trimethylpentane 16.78
    2-methyltetrahydrofuran 223.25
    n-hexyl acetate 94.65
    isooctane 14.64
    2-(2-butoxyethoxy)ethanol 207.71
    sec-butyl acetate 51.03
    tert-butyl acetate 74.88
    decalin 11.18
    glycerin 502.37
    diglyme 315.67
    acrylic acid 310.2
    isopropyl myristate 41.52
    n-butyric acid 264.86
    acetyl acetate 67.68
    di(2-ethylhexyl) phthalate 43.2
    ethyl propionate 69.86
    nitromethane 484.93
    1,2-diethoxyethane 129.17
    benzonitrile 82.77
    trioctyl phosphate 42.02
    1-bromopropane 79.38
    gamma-valerolactone 286.35
    n-decanol 70.49
    triethyl phosphate 36.46
    4-methyl-2-pentanol 102.67
    propionitrile 158.35
    vinylene carbonate 116.83
    1,1,2-trichlorotrifluoroethane 253.71
    DMS 67.64
    cumene 20.63
    2-octanol 74.52
    2-hexanone 95.93
    octyl acetate 58.27
    limonene 39.98
    1,2-dimethoxyethane 341.66
    ethyl orthosilicate 39.04
    tributyl phosphate 42.0
    diacetone alcohol 146.13
    N,N-dimethylaniline 66.84
    acrylonitrile 193.28
    aniline 109.39
    1,3-propanediol 524.2
    bromobenzene 34.24
    dibromomethane 109.31
    1,1,2,2-tetrachloroethane 141.35
    2-methyl-cyclohexyl acetate 45.9
    tetrabutyl urea 65.85
    diisobutyl methanol 52.33
    2-phenylethanol 90.95
    styrene 29.19
    dioctyl adipate 55.28
    dimethyl sulfate 125.72
    ethyl butyrate 62.52
    methyl lactate 141.47
    butyl lactate 80.53
    diethyl carbonate 42.34
    propanediol butyl ether 195.35
    triethyl orthoformate 52.85
    p-tert-butyltoluene 25.53
    methyl 4-tert-butylbenzoate 79.41
    morpholine 436.61
    tert-butylamine 233.52
    n-dodecanol 56.22
    dimethoxymethane 336.7
    ethylene carbonate 94.75
    cyrene 102.65
    2-ethoxyethyl acetate 93.86
    2-ethylhexyl acetate 49.86
    1,2,4-trichlorobenzene 56.69
    4-methylpyridine 142.92
    dibutyl ether 72.01
    2,6-dimethyl-4-heptanol 52.33
    DEF 224.67
    dimethyl isosorbide 138.93
    tetrachloroethylene 125.3
    eugenol 105.39
    triacetin 79.42
    span 80 132.9
    1,4-butanediol 247.43
    1,1-dichloroethane 107.57
    2-methyl-1-pentanol 147.26
    methyl formate 317.84
    2-methyl-1-butanol 202.62
    n-decane 15.2
    butyronitrile 150.02
    3,7-dimethyl-1-octanol 79.17
    1-chlorooctane 43.04
    1-chlorotetradecane 20.83
    n-nonane 15.12
    undecane 12.31
    tert-butylcyclohexane 12.92
    cyclooctane 10.01
    cyclopentanol 263.74
    tetrahydropyran 229.95
    tert-amyl methyl ether 117.95
    2,5,8-trioxanonane 227.99
    1-hexene 58.08
    2-isopropoxyethanol 210.55
    2,2,2-trifluoroethanol 232.45
    methyl butyrate 101.42

    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