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Re: [GreenYes] David Wollner, Sandhill tile
In a message dated 3/15/02 10:14:30 AM, writes:
<< The reason Sandhill can make tiles with those extraordinary colors

is because they use virgin materials.

David Wollner >>

Please tell me 
1) Where you got the impression that Sandhill uses virgin materials, and
2) Why you would say something like that, when you apparently don't know.

I developed the process Sandhill uses to make tiles.  They pay me a licensing 
Their tiles are made from 99.5 percent RECYCLED plate glass.  They do use 
ceramic colorants, the same as those used in ceramic glazes.  

If you want to get into a pissing contest, I would welcome any comparison 
with environmental benefits associated with Sandhill's vs Aurora's process.  
For example, Aurora makes tile by remelting glass in an inefficient 
small-scale crucible process at over 2000 degrees, at VERY HIGH energy cost.  
In comparison, Sandhill uses kilns at about 1500 degrees, not needing to 
remelt the glass because we use a sintering process.

If the difference between 99.5 and 100 percent is a big deal to you, I would 
also be interested to know whether Aurora adds absolutely ZERO batch 
modifiers from VIRGIN MATERIALS.  I know a little about remelting glass, and 
I imagine Aurora probably does a little batch modification for workability, 
but I won't say so, because UNLIKE DAVID, I don't make claims I know nothing 

David, please reply.

Bob Kirby
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