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Insulating board that won't drop powder as it is touched

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John Hinkley30/03/2020 09:00:44
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854 forum posts
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Chris TT,

If you want to while away an hour or two, head on over to Shadon HKW on YouTube and have a look at his series of videos describing the design and build of the heat treat oven he has built. Admittedly, he is making them for sale, but you might get a few useful ideas from his experiences. No.1 video starts here :

Heat treat oven

He is using a refractory brick to line the oven, but it's some while since I viewed the videos and I can't remember exactly what is specification is. It's easily cut - he says with a bread knife, even - and seems quite stable once installed.

Rather than use a lid, his design is a heated box with a hinged door on the front, which seems an eminently sensible solution to me and I would have thought gives easier access to the hot components, too.

John

Oven Man30/03/2020 10:09:27
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All commercially made laboratory and industrial heat treatment ovens going up to around 600C have stainless steel liners to overcome the dust problem. As most have a circulating fan the abrasive effect of the air on any soft insulation is disastrous. For high temp use back the stainless with 25 mm of ceramic fibre and then a layer of mineral wool slab about 50 mm thick. If you want a nice cool exterior build a double skin case with a ventilated airgap. For a simple home built job vermiculite board is probably as good as it gets for non shedding material. If you are using stainless for oven building go for ferritic 430 rather than austenitic 304, it doesn't expand as much.

HTH Peter

Chris TickTock30/03/2020 11:13:35
361 forum posts
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Posted by Oven Man on 30/03/2020 10:09:27:

All commercially made laboratory and industrial heat treatment ovens going up to around 600C have stainless steel liners to overcome the dust problem. As most have a circulating fan the abrasive effect of the air on any soft insulation is disastrous. For high temp use back the stainless with 25 mm of ceramic fibre and then a layer of mineral wool slab about 50 mm thick. If you want a nice cool exterior build a double skin case with a ventilated airgap. For a simple home built job vermiculite board is probably as good as it gets for non shedding material. If you are using stainless for oven building go for ferritic 430 rather than austenitic 304, it doesn't expand as much.

HTH Peter

Many thanks Peter, all points noted

Chris

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