Help identifying coating on .75 aluminum plate.
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  1. #1
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    Default Help identifying coating on .75 aluminum plate.

    I was given some alum plate that has a black finish on it. Originally I just assumed it was some
    sort of powder coat but after drilling a couple of holes I don't think that now. It's almost like
    some sort of ceramic finish. Would like to use some of this material on a new project but am
    concerned about what this stuff is. Is it hazardous/harmful? Precautions? What little I know about
    this material is I "think" it came off a machine from the semiconductor industry. Has anyone run
    across anything similar?
    Appreciate the input
    lsneon

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    Maybe hard coat black anodize?

  3. Likes ernieflash liked this post
  4. #3
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    even regular typeII will powder when drilled, black dye means it will (usually) be thicker oxide than other dyes, also higher contrast of the powder on black makes it more noticeable

    proper hardcoat would ruin hss drills very quickly...

    edit, it isn't hazardous, aluminum oxide mostly

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    probably anodize non conductive ?
    especially in electronics industry jmo


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