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plaster silica

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Dick
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Location: San Diego
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plaster silica

Postby Dick » Mon Mar 23, 2020 2:34 pm

HI all. I usually use r and r but the new forms will get so much cold working I can get by with plaster silica. I know mixes like r and r have a shelf life. How about plaster silica? does it matter if they are mixed or separate? I have an old bag of silica and would like to mix it with new plaster but would like some info first

thanks

Don Burt
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Location: Cincinnati, Ohio
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Re: plaster silica

Postby Don Burt » Mon Mar 23, 2020 8:21 pm

I just used silica that's at least five years old with some new #1 pottery plaster, 50x50 and it set and dried nicely. The silica was stored in pretty stable conditions in a plastic bag.

Don Burt
Posts: 537
Joined: Sun Mar 09, 2003 8:45 pm
Location: Cincinnati, Ohio
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Re: plaster silica

Postby Don Burt » Mon Mar 23, 2020 8:27 pm

Plaster relief molds
Image

Dick
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Joined: Sun May 01, 2005 9:34 pm
Location: San Diego
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Re: plaster silica

Postby Dick » Tue Mar 24, 2020 12:21 am

Thanks Don, I appreciate the info.

Dick

Nikki ONeill
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Location: Silver Spring, MD
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Re: plaster silica

Postby Nikki ONeill » Mon Sep 28, 2020 5:34 pm

Speaking of old plaster, I have a sealed box of C & R Loo MM 522 from 17 years ago, that I never got around to using (or opening). I have no idea what the mold mix is but would like to use it...part of finding and clearing out obsolete stuff and starting fresh. What else to do while hibernating? Does anyone remember back then? C R Loo is no longer, and I can't find anything about this MM on the internet. My R&R mixes are still good (tested 910 and 465), as are two plasters, olivenes, silicas, and Castalot. I'm jump starting getting back into casting, trying to stretch the mind a bit in a revived direction, and taking Richard Whitely's Coring Zoom class. . thank you for any insights.


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