 |
 |
|
 |
© 1999-2004
Association of Lifecasters International
All rights reserved.
|
|
|
|
|
|
FORUMS
|
|
|
|
|
  |
| Author |
Message |
John Collins
Joined:
:
17-May-2005
|
Started On : 07-Aug-2006 at 12:00:02 PM, #Views : 6722
Topic Subject : RE: Mixing Gypsum |
|
Titanium dioxide is a whitener commonly used in precast cements.
John
Quikrete
Precast Cements Div.
High Performance
-----Original Message-----
From: aliforum@lifecasting.org [mailto:aliforum@lifecasting.org]
Sent: Friday, August 04, 2006 7:00 PM
To: johncollins@concreterepair.com
Subject: Re: Mixing Gypsum( Message No. 1089)
-----------------Amazon.com ALI Sponsor -------->
Three life casting DVDs available. Hands & Feet
Face Casting and Female Torso Casting. Available
through http://www.Amazon.com
-------------------------------------------------------->
Hello John Collins
Post Date : Friday 04th of August 2006 11:00:02 PM
Posted by : "Dan Spector" archicast@earthlink.net
Re: Mixing Gypsum:--
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)
>
> -----------------Amazon.com ALI Sponsor -------->
>
> Three life casting DVDs available. Hands & Feet
> Face Casting and Female Torso Casting. Available
> through http://www.Amazon.com
> -------------------------------------------------------->
>
> 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.
>
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.
|
|
|
| |
|
|
|
|
)
)
)
)
)
)
)
)
)
)
