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  #131  
Old 05-21-2013, 04:14 AM
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Default Re: Bacterium's 2nd build

It's actually safer to drive out the moisture before rendering it.
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  #132  
Old 05-21-2013, 04:25 AM
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Default Re: Bacterium's 2nd build

Why?

David am only reporting what I was told by a commercial refractory builder. Same source re using the shirilite first prior to blanket. One of the points in doing this first revolves around ceramic blanket fibers getting through cracks, as I believe in Europe they have banned ceramic blanket due to carcinogenic issues now using superwool.
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Last edited by oasiscdm; 05-21-2013 at 04:38 AM.
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  #133  
Old 05-21-2013, 04:45 AM
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Default Re: Bacterium's 2nd build

Ok, I take your point. It is possible that some fibres could find their way through cracks in the dome with all the expansion and contraction going on there could be some abrasion to the blankets surface. I don't use blanket at all, mainly because of the cloud over its safety. I work in a school and we are not allowed to use ceramic blanket any more because of its greater risk to young people.the water soluble stuff is safe, but more expensive. I stick to perlite and vermiculite which I can obtain locally and it's relatively safe.

My comment re safer to drive out the water prior to rendering relates to steam pressure causing outer shell cracks.

Last edited by david s; 05-21-2013 at 04:47 AM.
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  #134  
Old 05-21-2013, 05:38 AM
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Default Re: Bacterium's 2nd build

With a small vent like cobblerdave and others have used would that not prevent that? Thus Creating a point of least resistance for steam to escape thus protecting the outer shell.
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Last edited by oasiscdm; 05-21-2013 at 05:44 AM.
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  #135  
Old 05-21-2013, 01:21 PM
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Default Re: Bacterium's 2nd build

The pathway for the steam, through the insulatin layer is fairly restricted before it even reaches the vent so a lot of water can still crack the outer shell. A vent works pretty well but can't release large volumes if they suddenly turn to steam. Especially if you have a thick vermicrete layer, that whole layer can expand considerably. It is better to eliminate the water as much as possible before rendering the outer shell, otherwise you tend to lock in moisture.
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  #136  
Old 05-22-2013, 01:02 AM
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Default Re: Bacterium's 2nd build

Crack minimisation .......sounds like another oven mantra

Can someone enlighten me on the shiralite stuff pls.
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  #137  
Old 05-22-2013, 01:14 AM
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Default Re: Bacterium's 2nd build

If you research Shiralite I think you'll find that although it is classed as insulating it's pretty dense. That of course makes it stronger but less insulating. It is a fancier version of vermicrete or perlcrete and able to withstand much higher temperatures because it contains calcium aluminate cement.
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  #138  
Old 05-22-2013, 01:15 AM
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Default Re: Bacterium's 2nd build

Shirilite Is Commercial Product, Perlite Vermiculite, Refractory Cement Fire Clay.
Just Add water.
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  #139  
Old 05-22-2013, 01:53 AM
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Default Re: Bacterium's 2nd build

Quote:
Originally Posted by oasiscdm View Post
Shirilite Is Commercial Product, Perlite Vermiculite, Refractory Cement Fire Clay.
Just Add water.
And some high temperature aggregate and fibres in the mix too IIRC.
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  #140  
Old 05-22-2013, 02:03 AM
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Default Re: Bacterium's 2nd build

If it one of them high temp refractory so called insulators then forget it, Ive used a similar product and its just useless.

Stick with vermiculite or cf blanket.
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