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Joined:
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31-Dec-1969
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Started On : 04-Aug-2006 at 11:00:02 PM, #Views : 6022
Topic Subject : Re: Mixing Gypsum |
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Huhh?
There is no silica, no Portland and no titanium in Hydrostone as far as I
know.
HStone behaves different from HCal:
Hstone forms a thick slurry. Pour it into a mold and go away. it does not
slowly thicken, as HCal does, so you cannot slump it up the sides of a mold.
It keeps flowing downhill until it takes what they call a snap cure. Soon it
is too hard to rasp. I don't care for it as I like my castings thin, not
filled solid.
You can add some to HCal for greater hardness.
Dan
> From: aliforum@lifecasting.org
> Date: Fri, 4 Aug 2006 17:57:30 -0400
> To: archicast@earthlink.net
> Subject: Mixing Gypsum( Message No. 1087)
>
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>
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> Hello Dan Spector
>
>
> Post Date : Friday 04th of August 2006 05:57:27 PM
> Posted by : "Diane Rossong" Diane@lastingimpression.net
>
> Mixing Gypsum:--
> 'Hello there
> Just wondering if anyone can help me with the new gypsum I am using. I have
> for a few years now been using a dental gypsum called silky rock (white). I
> really have liked the results I have been getting with it, but the distributor
> here has doubled the price on me in the past year. So I decided to
> inverstigate what most of you have been using and found a supplier here in my
> city with hydrostone by usg (10,000 psi) , (way cheaper)it is about the same
> strength and colour of the silky rock by whip mix(13,000 psi). I checked the
> ingredients and found they are pretty much the same Plaster of
> paris/crystalline silica. I don't think the dental has portland cement in it
> like the usg, but has titanium dioxide, (??)
> I am used to mixing this stuff into a pretty thick slurry 4 parts powder to 1
> part water, but can not figure out the correct measurements of the hydrostone.
> It just seems way to thin. I thought it said 10 parts powder to 7 parts water.
> I figure that the expantion rate would go down and strength would go up with
> less water.
>
> I think someone was asking before about the colour of dental plaster and I can
> now comment that you can buy dental gypsum in a bunch of different colours
> (ivory, yell, white, light brown etc.) and I see now that the hysdrostone is
> even a little darker than the silky rock white.
>
> So my question is... Can anyone tell me what measurements they use in lets say
> cups or parts.
> Even with the hydrocal.
>
> Your help would greatly be appreciated!
>
> Diane
>
> ALI is an international organization whose members are engaged in the art and
> creative industries. Its purpose is to promote the art of life casting, create
> public awareness of this unique art form, provide its members with forums to
> exchange information, resources to enhance their effectiveness and advance
> opportunities for their artistic success.
>
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