Cryolite

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  • Identifiers

    CAS number
    15096-52-3

    Molecular formula
    AlF6Na3

    SMILES
    F[Al-3](F)(F)(F)(F)F.[Na+].[Na+].[Na+]

    Safety labels

    Irritant
    Irritant

    Health Hazard
    Health

    Environmental Hazard
    Environmental

  • Odor profile

    Fragrance
    Odorless 59.13%
    Sweet 21.71%
    Fishy 20.39%
    Savory 16.79%
    Sulfurous 15.61%
    Meaty 15.46%
    Clean 14.16%
    Cooling 13.44%
    Animal 12.91%
    Green 12.84%

     

    Flavor
    Odorless 32.07%
    Sulfurous 18.23%
    Bland 18.14%
    Rotten 17.27%
    Bloody 17.13%
    Catty 16.94%
    Decomposing cabbage 16.87%
    Glue 16.79%
    Sweet-like 16.72%
    Bouillon 16.67%

     

  • Properties

    pKa est.
    -2.29 (strong acid)

    Molecular weight
    209.941265 g/mol

    Melting point expt.

    • 1832 °F (NIOSH, 2024)
    • 960-1027 °C
    • Melting point: 1009-1012 °C; heat of formation: -3297 kJ/mol; heat of fusion: 225 kJ/mol at 1012 °C; refractive index: 1.339; vapor pressure: 253 Pa at 1000 °C. /from table/
    • 1009 °C

    Boiling point

    • Decomposes (NIOSH, 2024)

    Flash point

    • -86.82 ˚C est.

    Solubility expt.

    • 0.04 % (NIOSH, 2024)
    • SOL IN DILUTE ALKALI
    • SOL IN FUSED ALUMINUM, FERRIC SALTS
    • INSOL IN ALCOHOL
    • Sol in concentrated sulfuric acid
    • For more Solubility (Complete) data for ALUMINUM SODIUM FLUORIDE (8 total), please visit the HSDB record page.
    • Solubility in water, g/100ml at 25 °C: 0.042 (very poor)

  • Synonyms

    • CRYOLITE
    • Sodium hexafluoroaluminate
    • 15096-52-3
    • 13775-53-6
    • Cryolite (Na3(AlF6))
    • Aluminum trisodium hexafluoride
    • Aluminum sodium fluoride
    • sodium hexafluoroaluminate(III)
    • trisodium;hexafluoroaluminum(3-)
    • Sodium aluminum hexafluoride
    • trisodium hexafluoroaluminum(3-)
    • MFCD00003507
    • Cryocide
    • Kryocide
    • Kryolith
    • ICE Spar
    • Na3AlF6
    • Cryolite (AlNa3F6)
    • trisodium hexafluoroalumanetriuide
    • CRYOLITE [MI]
    • Na3[AlF6]
    • PROKIL CRYOLITE-96
    • trisodium hexafluoridoaluminate
    • sodiumhexafluoroaluminate(III)
    • 5ZIS914RQ9
    • CHEMBL3988899
    • CHEBI:39289
    • sodium hexafluoridoaluminate(3-)
    • Sodium hexafluoroaluminate, 97%
    • DTXSID90872955
    • sodium hexafluoridoaluminate(III)
    • trisodium hexafluoroaluminate(3-)
    • AKOS025310262
    • FS92914
    • trisodium hexakis(fluoranyl)aluminum(3-)
    • Chromium Boride (Cr2B) Sputtering Targets
    • Cryolite, synthetic, >=97.0% (from F)
    • C18816
    • trisodium (OC-6-11)-hexafluoroaluminate(3-)
    • A809094
    • Q927885
    • Sodium hexafluoroaluminate, 99.98% trace metals basis
    • Cryolite,naturallyoccurringmineral,grains,approximately0.06-19in

  • Applications

    Cryolite (CAS 15096-52-3, Na3AlF6) is primarily used as a flux in the electrolytic production of aluminum (the Hall-Héroult process), lowering the melting point of alumina and improving electrolyte conductivity. It is also used in the glass and ceramic industries as a flux to modify melting behavior and processing of frits and glazes, and in inorganic synthesis as a fluoride source for preparing aluminum fluoride compounds or other fluoride-based chemistries, serving as an additive fluoride in various metalworking or ceramic processing workflows. Its use is subject to local regulations and formulation limits.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 382.84
    methanol 620.53
    isopropanol 362.39
    water 98.89
    ethyl acetate 131.27
    n-propanol 275.5
    acetone 328.4
    n-butanol 228.56
    acetonitrile 244.09
    DMF 786.03
    toluene 60.9
    isobutanol 181.29
    1,4-dioxane 230.14
    methyl acetate 147.62
    THF 384.63
    2-butanone 166.08
    n-pentanol 135.55
    sec-butanol 253.09
    n-hexane 51.31
    ethylene glycol 269.68
    NMP 364.43
    cyclohexane 61.52
    DMSO 940.25
    n-butyl acetate 75.42
    n-octanol 106.18
    chloroform 254.52
    n-propyl acetate 82.23
    acetic acid 205.29
    dichloromethane 256.02
    cyclohexanone 136.1
    propylene glycol 214.7
    isopropyl acetate 102.19
    DMAc 438.28
    2-ethoxyethanol 257.4
    isopentanol 159.59
    n-heptane 58.83
    ethyl formate 131.26
    1,2-dichloroethane 196.79
    n-hexanol 133.81
    2-methoxyethanol 512.3
    isobutyl acetate 42.67
    tetrachloromethane 78.34
    n-pentyl acetate 78.3
    transcutol 243.83
    n-heptanol 101.28
    ethylbenzene 42.92
    MIBK 108.92
    2-propoxyethanol 243.86
    tert-butanol 373.17
    MTBE 198.8
    2-butoxyethanol 149.92
    propionic acid 157.9
    o-xylene 71.81
    formic acid 240.71
    diethyl ether 266.85
    m-xylene 61.41
    p-xylene 50.78
    chlorobenzene 58.69
    dimethyl carbonate 119.85
    n-octane 27.81
    formamide 408.8
    cyclopentanone 206.42
    2-pentanone 159.25
    anisole 94.32
    cyclopentyl methyl ether 176.53
    gamma-butyrolactone 226.53
    1-methoxy-2-propanol 392.64
    pyridine 141.06
    3-pentanone 131.63
    furfural 199.77
    n-dodecane 20.82
    diethylene glycol 267.47
    diisopropyl ether 94.86
    tert-amyl alcohol 250.74
    acetylacetone 161.92
    n-hexadecane 21.86
    acetophenone 86.6
    methyl propionate 145.92
    isopentyl acetate 62.79
    trichloroethylene 184.96
    n-nonanol 92.24
    cyclohexanol 151.9
    benzyl alcohol 91.75
    2-ethylhexanol 76.17
    isooctanol 76.76
    dipropyl ether 132.51
    1,2-dichlorobenzene 64.56
    ethyl lactate 88.36
    propylene carbonate 110.85
    n-methylformamide 375.51
    2-pentanol 189.08
    n-pentane 97.69
    1-propoxy-2-propanol 171.05
    1-methoxy-2-propyl acetate 103.45
    2-(2-methoxypropoxy) propanol 120.86
    mesitylene 56.35
    ε-caprolactone 113.11
    p-cymene 50.77
    epichlorohydrin 213.01
    1,1,1-trichloroethane 132.36
    2-aminoethanol 305.46
    morpholine-4-carbaldehyde 313.19
    sulfolane 328.78
    2,2,4-trimethylpentane 32.76
    2-methyltetrahydrofuran 195.22
    n-hexyl acetate 95.01
    isooctane 27.32
    2-(2-butoxyethoxy)ethanol 149.89
    sec-butyl acetate 55.02
    tert-butyl acetate 116.09
    decalin 22.14
    glycerin 292.68
    diglyme 246.73
    acrylic acid 153.23
    isopropyl myristate 56.13
    n-butyric acid 145.65
    acetyl acetate 79.71
    di(2-ethylhexyl) phthalate 48.97
    ethyl propionate 88.14
    nitromethane 312.11
    1,2-diethoxyethane 113.24
    benzonitrile 79.29
    trioctyl phosphate 47.2
    1-bromopropane 151.17
    gamma-valerolactone 214.06
    n-decanol 73.61
    triethyl phosphate 56.65
    4-methyl-2-pentanol 105.32
    propionitrile 161.67
    vinylene carbonate 98.88
    1,1,2-trichlorotrifluoroethane 206.44
    DMS 78.93
    cumene 39.48
    2-octanol 86.6
    2-hexanone 85.38
    octyl acetate 65.27
    limonene 65.82
    1,2-dimethoxyethane 351.11
    ethyl orthosilicate 58.38
    tributyl phosphate 46.53
    diacetone alcohol 168.7
    N,N-dimethylaniline 103.15
    acrylonitrile 193.11
    aniline 106.9
    1,3-propanediol 287.03
    bromobenzene 55.76
    dibromomethane 209.57
    1,1,2,2-tetrachloroethane 207.74
    2-methyl-cyclohexyl acetate 63.01
    tetrabutyl urea 78.13
    diisobutyl methanol 67.53
    2-phenylethanol 89.18
    styrene 47.7
    dioctyl adipate 62.94
    dimethyl sulfate 193.12
    ethyl butyrate 76.18
    methyl lactate 149.81
    butyl lactate 81.84
    diethyl carbonate 57.11
    propanediol butyl ether 152.26
    triethyl orthoformate 67.01
    p-tert-butyltoluene 56.22
    methyl 4-tert-butylbenzoate 117.84
    morpholine 263.58
    tert-butylamine 292.08
    n-dodecanol 60.28
    dimethoxymethane 470.95
    ethylene carbonate 87.93
    cyrene 112.7
    2-ethoxyethyl acetate 86.43
    2-ethylhexyl acetate 51.92
    1,2,4-trichlorobenzene 74.61
    4-methylpyridine 133.38
    dibutyl ether 79.63
    2,6-dimethyl-4-heptanol 67.53
    DEF 226.46
    dimethyl isosorbide 160.71
    tetrachloroethylene 163.1
    eugenol 120.27
    triacetin 91.25
    span 80 108.32
    1,4-butanediol 129.46
    1,1-dichloroethane 169.44
    2-methyl-1-pentanol 93.75
    methyl formate 248.48
    2-methyl-1-butanol 151.8
    n-decane 31.46
    butyronitrile 141.54
    3,7-dimethyl-1-octanol 79.55
    1-chlorooctane 65.54
    1-chlorotetradecane 34.39
    n-nonane 32.34
    undecane 24.7
    tert-butylcyclohexane 22.73
    cyclooctane 31.53
    cyclopentanol 188.89
    tetrahydropyran 174.11
    tert-amyl methyl ether 163.61
    2,5,8-trioxanonane 188.25
    1-hexene 82.56
    2-isopropoxyethanol 159.22
    2,2,2-trifluoroethanol 132.34
    methyl butyrate 101.8

    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