[Clayart] Safety issues with melting glass in functional pots

[Robert L. Johnson via Clayart]

Had anyone experienced dangers associated with clear melted glass in mugs,
bowls, or other food vessels?

I understand that there will be microcracks that could harbor very small
food and dust particles. That doesn’t worry me. But is there a danger of
glass chunks falling out and getting swallowed any more than normal glaze
chunks spalling off?
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[joel joelfink.net via Clayart]

I would worry about differences in coefficients of expansion shivering off fragments of glass into food.

Joel Fink
Ficklefink Pottery
________________________________
From: Clayart <clayart...@lists.clayartforum.com> on behalf of Robert L. Johnson via Clayart <cla...@lists.clayartforum.com>
Sent: Tuesday, June 11, 2024 4:30 PM
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Cc: Robert L. Johnson <impal...@gmail.com>
Subject: [Clayart] Safety issues with melting glass in functional pots

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[sumi via Clayart]

I believe this is generally considered a very dangerous practice for any
form that is intended for food. You can experiment on ware that you
intend to use, but I believe it would be inadvisable to give or sell
these items to anyone else to use for food.

Sumi

--
Sumi von Dassow
President, Beulah Valley Arts Council

[ronroy--- via Clayart]

Hi Robert,

It probably depends on the difference in expansion/contraction between
the clay and the glass. It's complicated and I would say unpredictable
without measuring each and then deciding how wide those cracks are.

I would not choose to do that.

RR

Quoting "Robert L. Johnson via Clayart" <cla...@lists.clayartforum.com>:

> Had anyone experienced dangers associated with clear melted glass in mugs,
> bowls, or other food vessels?
>
> I understand that there will be microcracks that could harbor very small

> food and dust particles. That doesn?t worry me. But is there a danger of

> glass chunks falling out and getting swallowed any more than normal glaze
> chunks spalling off?
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> An HTML attachment was scrubbed...
> URL:
> <https://lists.clayartforum.com/pipermail/clayart/attachments/20240611/df44f292/attachment.htm>
>

Ron Roy
ron...@ca.inter.net
Web page ronroy.net