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hard anodized aluminium: oxide layer is ceramic– more fire -proof?


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Home Forums Gear Forums Gear (General) hard anodized aluminium: oxide layer is ceramic– more fire -proof?

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  • #1274946
    al b
    BPL Member

    @ahbradley

    In hard anodized aluminium, the anodization's resulting oxide layer is a ceramic–

    so would hard anodized aluminium foil be fire-proof if used in a wood stove, providing anodizing is thick enough. Even if inner plain aluminium melted would the ceramic hold it together till "unmelts"?

    #1745230
    Colin Krusor
    BPL Member

    @ckrusor

    Locale: Northwest US

    No. It wouldn't. Alumina (aluminum oxide) is extremely brittle. On anodized foil it is actually millions of separate little particles individually bound to the metallic aluminum substrate, all of them separated by a web of billions of tiny cracks and fissures. It isn't one continuous sheet of ceramic. The anodized surface has no more structural value than the paint on a house.

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