#11  
Old 08-10-2009, 11:34 AM
Il Pizzaiolo
 
Join Date: Nov 2006
Location: San Antonio
Posts: 1,719
Default Re: sparplast 30ar

Thanks, StonyLake! Good find!

The silica and other nonorgainic stuff should not be a problem much more than cement. You are supposed to wear respirator, safety glasses, gloves, etc. to avoid contact with the stuff and should take a shower after working with it.

The SPARPLAS 30AS sheet says it can have 0 to 5% amorphous polymer. That could be almost anything. The amorphous polymer we used to make at the polypropylene plant I worked in contained xylene, benzene, and toluene which are definitely to be avoided.

Couple of points. First the SPARPLAS may be clean - i.e not contain stuff like that. However, if it isn't those are pretty heavy molecules and won't just vaporize quickly to give you a clean oven. They have fairly high boiling points so they will probably release to the atmosphere over a prolonged period. (Note: they should cook out of the surface fairly quickly but it might take some time to get them "out of the interior of the refractory) And finally, I know I mentioned food grade for it is an interesting thing to consider, but I doubt regular fire bricks are technically "food grade".

Good luck!
Jay

Last edited by texassourdough; 08-10-2009 at 01:07 PM.
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  #12  
Old 08-10-2009, 12:29 PM
Apprentice
 
Join Date: Aug 2009
Location: grand rapids, michigan
Posts: 139
Default Re: sparplast 30ar

the sparplas will cost me about 11 cents a square inch (at 2" thick) compared to 4 cents for firebrick (plus mortar). if my math is correct, a 42" oven will be about 2750 square inches minus the doorway = 250sqin or 2500 total. $275 for sparplas, $100 plus mortar for firebrick...
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  #13  
Old 08-10-2009, 12:33 PM
Apprentice
 
Join Date: Aug 2009
Location: grand rapids, michigan
Posts: 139
Default Re: sparplast 30ar

whoops, missed it...42" oven plan calls for 135 2x4x8 bricks @ $1.35 each = $182.25...not $100.00
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  #14  
Old 09-18-2009, 11:00 AM
Apprentice
 
Join Date: Aug 2009
Location: grand rapids, michigan
Posts: 139
Default Re: sparplast 30ar

My wife gave me a hall pass to build an oven last weekend. i knowked down a chunk of my fieldstone retaining wall Monday nite, and we poured the slab yesterday. my goal is to have my stand and hearth done before winter, build the oven early spring...
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