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

is because they use virgin materials.

David Wollner >>

David:
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 
fee.
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 
about.

David, please reply.

Bob Kirby
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