Re: [ATM] glass or ceramic blank?

[Lawrence Sayre <lsayre@neo.rr.com>]

Mark Holm wrote:
> 
> You can probably buy dental stone locally from a dentists supply place.  
> You want buff labstone or something similar.  There are a whole bunch of 
> brands.  Each brand tints theirs differently.  Color isn't a reliable 
> indicator of properties.  If you have a choice, pick one with the best 
> water resistance, longest setting time, and least shrinkage/expansion 
> during setting.  It should set up in 10 - 15 minutes (maybe a bit 
> less).  If the dentists supply place doesn't want to deal with you, ask 
> your dentist if he/she will order it for you.
> 
> Alternatively, get US Gypsum Hydrostone.  It is used for casting 
> statuary, architectural details and the like.  I haven't used it, but 
> the instructions and propeties sheet (see USG web site) make it sound 
> pretty similar to dental stone.
> 

I spoke with a US Gypsum sales rep once and he told me their Hydrocal 
line is where their dental stone stems from.  Their Hydrostone material 
is a superior product overall for our purposes.

Lawrence Sayre
-- 
My philosophy, in essence, is the concept of man as
a moral being, with his own happiness as the moral
purpose of his life, with productive achievement as
his noblest activity, and reason as his only absolute.

Ayn Rand (in the appendix to 'Atlas Shrugged')


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