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-   -   Perlite vs Expanded Perlite or Vermiculite (http://www.fornobravo.com/forum/f2/perlite-vs-expanded-perlite-vermiculite-7717.html)

lwood 08-29-2009 05:06 AM

Perlite vs Expanded Perlite or Vermiculite
 
What is the difference in terms of insulating factor? Most of you out there, I assume, are using expanded Perlite or what I know as Vermiculite. Is that a true assumption? Even so, how much insulating factor difference is there in the two. I'm sure people are using both.

dmun 08-29-2009 05:59 AM

Re: Perlite vs Expanded Perlite or Vermiculite
 
Perlite is a naturally occurring mineral that looks like this:
http://z.about.com/d/geology/1/0/5/S...picperlite.jpg
As far as I know it has little or no insulation value.
When crushed and heated, it pops like popcorn and produces the little lightweight white spheres that we are talking about in oven building.
Vermiculite is also a heated mineral, but it's brown in color, and the chunks are cubic instead of spherical.

They both work fine for oven insulation. Outside the US there may be some question of whether vermiculite is asbestos free, as the two minerals can be found in the same formations. For this reason, I'd stick with perlite if you can get it.

shuboyje 08-29-2009 06:38 AM

Re: Perlite vs Expanded Perlite or Vermiculite
 
Expanded Perlite has an R value of about 4 per inch of thickness. Vermiculite has an R value of about 3.4 per inch of thickness. Perlite also tends to be cheaper.

Neil2 08-29-2009 01:07 PM

Re: Perlite vs Expanded Perlite or Vermiculite
 
I found the perlite was more "workable" in terms of screeding and leveling.


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