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Thread: refractory for ceramic blanket/kaowool

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    refractory for ceramic blanket/kaowool

    I bought a devil forge but the ceramic blanket/kaowool hasn't been cast with any type of refractory. My understanding is that the fibers of the ceramic blanket are poisonous so you have to put some type of refractory over it. Something like satanite is a refractory and then something like ITC is used to retain more heat in the forge but the ITC isn't a refractory.

    Just trying to protect my health and I'm not exactly sure what I should do. Can anyone fill my in as to what I should do? Is there any alternative to satanite?

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    The ceramic fibre isn't poisonous but the fibres are not good to breathe like any siliceous dust. A bit like asbestos only not as bad.
    The refractory coating that we paint over it (satanite, ITC or Zircoat) reflects heat, not retains it.
    As long as you have your blanket coated and there are no loose fibres blowing around your forge should work wonderfully.

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    Quote Originally Posted by Jez View Post
    The ceramic fibre isn't poisonous but the fibres are not good to breathe like any siliceous dust. A bit like asbestos only not as bad.
    The refractory coating that we paint over it (satanite, ITC or Zircoat) reflects heat, not retains it.
    As long as you have your blanket coated and there are no loose fibres blowing around your forge should work wonderfully.
    Thanks for clearing that up Jez re the danger of it.

    So does satanite etc work as a rigidizer? Is there a difference between a rigidizer and a refractory coating? Do I need both or is one or the other fine?

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    G'day, I don't know much about forges but I do know a bit about insulation.

    Ceramic fibre products, like fiberglass ones, are (only) classified as 'respiratory irritants', as they break down into microscopic particles which healthy lungs can eventually expell, unlike asbestos which continues to break down into increasingly smaller fibres and at microscopic size can penetrate lung tissue and eventually reach the pleura potentially causing mesothelioma in those exposed to high concentrations, or having a genetic predisposition to it.

    But as ceramic fibre products have only been around for a few decades, the jury is still out. Treating it with respect not fear is the best way to go.

    Edited for correctness!
    Last edited by Hatchet; 19-07-2017 at 17:51.

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    The last time I relined my forge I didn't use any rigidiser, I just used a number of coats of Zircoat. It performs fine but will not take a knock.

    The coating of the Satanite massively increases the efficiency of the forge as it radiates heat away from itself really fast and I think the Zircoat that I use is good to about 2300 degC (I'd have to check that).
    The ceramic fibre is the same. Try heating up a piece, leave it for 5 sec and you should be able to pick it up. It's made from crystobalite which is the same stuff that the space shuttle tiles are made from.

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    When i built my forge, i used kaowool that i then treated with rigidizer then put two layers of satanite over. the rigidizer hardens the kaowool to give you some sort of hard base to put the satanite onto. without the ridgidizer the satanite would just flex on top of the soft kaowool and break up.

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    Quote Originally Posted by Hatchet View Post
    G'day, I don't know much about forges but I do know a bit about insulation.

    Ceramic fibre products, like fiberglass ones, are (only) classified as 'respiratory irritants', as they break down into microscopic particles which healthy lungs can eventually expell, unlike asbestos which continues to break down into increasingly smaller fibres and at microscopic size can penetrate lung tissue and eventually reach the pleura potentially causing mesothelioma in those exposed to high concentrations, or having a genetic predisposition to it.

    But as ceramic fibre products have only been around for a few decades, the jury is still out. Treating it with respect not fear is the best way to go.

    Edited for correctness!
    Thanks! I wasn't sure about the risks but just wanted to make sure I looked after myself. I've got asthma so I didn't want to take any risks.

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    I didn't know that if you heat a ceramic blanket it gets hard which is effectively what a rigidiser does. I don't really want to take any risks though so I'll just use some rigidiser and that will do for now. If I'm not getting enough heat I'll put some sort of refractory like satanite on top. I'm just going to be heat treating small knives to start off with.

    Does anyone know where to buy rigidiser or zircoat in Melbourne? I called up one place but they only sold rigidiser in minimum lots of 20kg.

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    what is rigidiser and where to buy it?

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