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frits / gerstley borate substitute ?

updated sun 28 nov 99

 

Khaimraj Seepersad on sat 27 nov 99

Folks ,
Good Day ,

I found this - Frit F-309
Fusion Ceramics

22.0 Ca0
5.0 Mg0
7.0 Na20
50.0 B203
3.0 Al203
13.0 Si02

or sub. Pemco 2201

22.2 Ca0
4.8 Mg0
6.8 Na20
51.5 B203
1.5 Al203
13.2 Si02 m.p - 1370 deg.f
approx. - 745 deg.c

Khaimraj Seepersad


-----Original Message-----
From: Dave Finkelnburg
To: CLAYART@LSV.UKY.EDU
Date: 25 November 1999 7:39
Subject: Re: Frits


>----------------------------Original message----------------------------
>With profuse apologies to Ron Roy, possibly the finest gentleman on this
>list::
> Gee whiz guys, give me a break, will you? :-) Just because I use
>Gerstley borate in a recipe doesn't mean I am anti-frit. I have a big bag
>of 3134 in my glaze-mix room and I use it. Frit's are OK, OK?
> For what it's worth, Naralon, 3134 contains less than half as much
>boron/pound as Gerstley borate, and costs me more than twice as much. That
>makes boron from 3134 about 5 times as expensive for me as if I use
Gerstley
>borate. That's far from the only cost consideration in making functional
>pottery for sure. It is something to consider.
> Dave Finkelnburg, sincerely grateful for Ron's glaze assistance