Frit compatibility -

Frit compatibility

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Jon Markovic
Posts: 8
Joined: Sat Nov 13, 2021 2:57 pm

Frit compatibility

Postby Jon Markovic » Wed Jan 05, 2022 9:45 am

I have read about the need to use compatible glass in a kiln, because mixing glass with different rates of expansion creates stresses that can cause work to crack.
It would seem to me that this is particularly relevant to larger pieces of glass with greater surface contract where stresses can form.. but perhaps less so when glass particle size is smaller.
So I've been wondering whether compatibility is such an issue where frit is used, and particular so when the frit is not fully fused (and adjacent frit pieces melt together to form a larger whole) into the base.
Any thoughts would be appreciated!

Kevin Midgley
Posts: 749
Joined: Mon Mar 10, 2003 11:36 am
Location: Tofino, British Columbia, Canada

Re: Frit compatibility

Postby Kevin Midgley » Fri Jan 07, 2022 11:12 am

Three Words.
Don't Do it.
Known differences will result in tiny cracks of incompatibility around the offending bits.
These could cause the piece to later break completely years later.

Tom Fuhrman
Posts: 186
Joined: Mon Mar 10, 2003 11:44 am
Location: eastern Tennessee

Re: Frit compatibility

Postby Tom Fuhrman » Sat Jan 08, 2022 7:06 pm

I've had pieces the size of a pinhead that when encased caused a piece to crack. There is always a chance of a piece cracking when combining different glasses even though they are theoretically the same COE. Dan, the owner of Bullseye has written some very good pieces on compatibility and I think they can be found on the Bullseye website. COE is not the only factor that determines if two glasses will be compatible. Viscosity also has a very important part in those determinations.

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