Beryllium Oxide

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  • Identifiers

    CAS number
    1304-56-9

    Molecular formula
    BeO

    SMILES
    [Be]=O

    Safety labels

    Acute Toxic
    Acute Toxic

    Health Hazard
    Health

  • Odor profile

    Fragrance
    Odorless 93.7%
    Pungent 22.81%
    Sharp 20.81%
    Burnt 16.16%
    Sour 15.87%
    Bitter 15.54%
    Ethereal 10.47%
    Caramellic 10.06%
    Fermented 9.77%
    Malty 9.41%

     

  • Properties

    pKa est.
    5.15 (weak acid)

    Molecular weight
    25.012 g/mol

    Melting point expt.

    • 2578 °C
    • 2530 °C

    Boiling point

    • 3787 °C

    Flash point

    • -22.72 ˚C est.

    Solubility expt.

    • Insoluble in water; slightly soluble in acid and alkali solutions
    • 2 ug/100 mL in water at 30 °C; soluble in concentrated sulfuric acid, fused potassium hydroxide
    • Slowly soluble in concentrated acids or fixed alkali hydroxides
    • Solubility in water: insoluble

  • Synonyms

    • BERYLLIUM OXIDE
    • 1304-56-9
    • oxoberyllium
    • Beryllia
    • Bromellete
    • Thermalox
    • Beryllium monoxide
    • Natural bromellite
    • Thermalox 995
    • Beryllium oxide (BeO)
    • CCRIS 83
    • HSDB 1607
    • EINECS 215-133-1
    • UNII-2S8NLR37S3
    • 2S8NLR37S3
    • CHEBI:62842
    • EC 215-133-1
    • 21883-51-2
    • Berylla
    • Glucina
    • Beryllium oxide, a
    • MFCD00003457
    • BROMELITE
    • Beryllium oxide, purum
    • DTXCID50820391
    • AKOS015903963
    • Beryllium oxide, 99.98% trace metals basis
    • Q422714
    • 215-133-1
    • 680-425-1

  • Applications

    BeO, CAS 1304-56-9, is used in several key applications such as high-thermal-conductivity ceramic dielectrics for power electronics and RF components; high-temperature ceramics and refractory materials for crucibles and furnace components; ceramic fillers in advanced polymer composites to boost thermal conductivity and electrical insulation while remaining lightweight; considered for nuclear applications as a neutron moderator or reflector in specialized systems (subject to safety regulations and waste handling); and related electronic and industrial uses where its combination of stiffness, thermal performance, and electrical insulation is advantageous.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 561.48
    methanol 683.4
    isopropanol 378.18
    water 49.55
    ethyl acetate 101.2
    n-propanol 349.27
    acetone 221.19
    n-butanol 287.53
    acetonitrile 165.89
    DMF 648.08
    toluene 30.39
    isobutanol 217.96
    1,4-dioxane 256.81
    methyl acetate 137.1
    THF 298.46
    2-butanone 135.28
    n-pentanol 189.13
    sec-butanol 256.27
    n-hexane 22.55
    ethylene glycol 314.08
    NMP 277.6
    cyclohexane 19.31
    DMSO 463.77
    n-butyl acetate 65.14
    n-octanol 81.97
    chloroform 109.49
    n-propyl acetate 73.27
    acetic acid 388.21
    dichloromethane 108.91
    cyclohexanone 113.09
    propylene glycol 244.31
    isopropyl acetate 56.22
    DMAc 267.85
    2-ethoxyethanol 257.59
    isopentanol 181.71
    n-heptane 21.58
    ethyl formate 99.03
    1,2-dichloroethane 81.93
    n-hexanol 146.49
    2-methoxyethanol 467.72
    isobutyl acetate 43.21
    tetrachloromethane 30.06
    n-pentyl acetate 51.35
    transcutol 369.95
    n-heptanol 83.16
    ethylbenzene 16.71
    MIBK 65.97
    2-propoxyethanol 224.14
    tert-butanol 348.94
    MTBE 133.27
    2-butoxyethanol 136.3
    propionic acid 235.6
    o-xylene 24.64
    formic acid 280.23
    diethyl ether 166.27
    m-xylene 24.34
    p-xylene 20.66
    chlorobenzene 33.2
    dimethyl carbonate 60.49
    n-octane 8.65
    formamide 319.13
    cyclopentanone 167.25
    2-pentanone 110.89
    anisole 55.36
    cyclopentyl methyl ether 119.42
    gamma-butyrolactone 184.42
    1-methoxy-2-propanol 296.87
    pyridine 125.29
    3-pentanone 71.89
    furfural 145.47
    n-dodecane 8.08
    diethylene glycol 234.86
    diisopropyl ether 40.01
    tert-amyl alcohol 228.43
    acetylacetone 85.51
    n-hexadecane 8.22
    acetophenone 42.92
    methyl propionate 104.37
    isopentyl acetate 51.0
    trichloroethylene 106.61
    n-nonanol 66.27
    cyclohexanol 140.73
    benzyl alcohol 65.64
    2-ethylhexanol 68.4
    isooctanol 61.4
    dipropyl ether 74.68
    1,2-dichlorobenzene 29.44
    ethyl lactate 51.87
    propylene carbonate 82.66
    n-methylformamide 346.98
    2-pentanol 175.67
    n-pentane 33.34
    1-propoxy-2-propanol 150.0
    1-methoxy-2-propyl acetate 64.05
    2-(2-methoxypropoxy) propanol 92.16
    mesitylene 16.93
    ε-caprolactone 102.9
    p-cymene 17.2
    epichlorohydrin 168.93
    1,1,1-trichloroethane 53.31
    2-aminoethanol 394.83
    morpholine-4-carbaldehyde 290.1
    sulfolane 193.36
    2,2,4-trimethylpentane 14.84
    2-methyltetrahydrofuran 195.41
    n-hexyl acetate 70.11
    isooctane 12.84
    2-(2-butoxyethoxy)ethanol 144.48
    sec-butyl acetate 40.54
    tert-butyl acetate 60.48
    decalin 9.26
    glycerin 292.71
    diglyme 223.59
    acrylic acid 204.99
    isopropyl myristate 30.61
    n-butyric acid 201.17
    acetyl acetate 48.36
    di(2-ethylhexyl) phthalate 29.02
    ethyl propionate 55.07
    nitromethane 297.13
    1,2-diethoxyethane 93.58
    benzonitrile 53.57
    trioctyl phosphate 28.42
    1-bromopropane 63.41
    gamma-valerolactone 192.17
    n-decanol 51.15
    triethyl phosphate 23.99
    4-methyl-2-pentanol 85.67
    propionitrile 123.87
    vinylene carbonate 77.13
    1,1,2-trichlorotrifluoroethane 155.54
    DMS 46.72
    cumene 15.49
    2-octanol 54.9
    2-hexanone 79.74
    octyl acetate 42.0
    limonene 28.38
    1,2-dimethoxyethane 256.39
    ethyl orthosilicate 26.32
    tributyl phosphate 28.14
    diacetone alcohol 113.39
    N,N-dimethylaniline 45.97
    acrylonitrile 144.65
    aniline 77.27
    1,3-propanediol 361.67
    bromobenzene 23.72
    dibromomethane 79.19
    1,1,2,2-tetrachloroethane 91.57
    2-methyl-cyclohexyl acetate 33.04
    tetrabutyl urea 42.69
    diisobutyl methanol 40.27
    2-phenylethanol 61.46
    styrene 23.28
    dioctyl adipate 38.84
    dimethyl sulfate 83.16
    ethyl butyrate 47.7
    methyl lactate 92.89
    butyl lactate 52.64
    diethyl carbonate 29.53
    propanediol butyl ether 130.88
    triethyl orthoformate 37.16
    p-tert-butyltoluene 17.83
    methyl 4-tert-butylbenzoate 51.66
    morpholine 334.08
    tert-butylamine 207.3
    n-dodecanol 40.76
    dimethoxymethane 238.3
    ethylene carbonate 63.83
    cyrene 64.83
    2-ethoxyethyl acetate 65.87
    2-ethylhexyl acetate 39.2
    1,2,4-trichlorobenzene 34.98
    4-methylpyridine 104.8
    dibutyl ether 56.52
    2,6-dimethyl-4-heptanol 40.27
    DEF 163.34
    dimethyl isosorbide 95.54
    tetrachloroethylene 78.59
    eugenol 64.41
    triacetin 55.2
    span 80 90.56
    1,4-butanediol 167.24
    1,1-dichloroethane 76.57
    2-methyl-1-pentanol 123.99
    methyl formate 200.79
    2-methyl-1-butanol 179.31
    n-decane 11.54
    butyronitrile 117.04
    3,7-dimethyl-1-octanol 62.05
    1-chlorooctane 31.38
    1-chlorotetradecane 14.93
    n-nonane 12.13
    undecane 9.32
    tert-butylcyclohexane 11.5
    cyclooctane 7.53
    cyclopentanol 191.98
    tetrahydropyran 196.31
    tert-amyl methyl ether 96.54
    2,5,8-trioxanonane 155.8
    1-hexene 56.35
    2-isopropoxyethanol 156.29
    2,2,2-trifluoroethanol 125.15
    methyl butyrate 78.37

    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