david clark on mon 23 aug 04
Hello kind folks,
I have a question regarding low expansion frit in North America. A glaze
recipe I would like to start working with calls for Low expansion frit but
does not specify which one. Frit 3195 which has a coefficient of expansion
of 9.6. and Frit 3124 has C.E 7.9. This to me says it is a low expansion
frit relative to 3195 but is it on the world of frits? Elsewhere there is a
frit call Low Expansion Frit. Since I cannot find this at my local
distributor I am at an impass. What is a low expansion frit in North
America?
This glaze is clear for a porcelain body I'm working with. I'll add
colorants.
Thank you much for your input
David Clark
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Edouard Bastarache Inc. on mon 23 aug 04
Hello David,
using Bob Wilt's GlazeChem I have just computed the expansion coefficient
of the 87 frits he lists.
The tree lowest ones are
1-Frit P2252, 60.0
Borax frit. Formerly Frit G.
Manufactured by Podmore & Sons Ltd.
Analyses:
Cooper & Royle:
% 5.44 Na2O 2.20 MgO 3.68 CaO 0.90 ZnO 6.70 Al2O3
15.35 B2O3 65.80 SiO2
Green:
0.40 Na2O 0.25 MgO 0.30 CaO 0.05 ZnO 0.30 Al2O3
1.00 B2O3 5.00 SiO2
2-Frit 3185, 60.8
Manufacture by Ferro
Sodium borosilicate frit; no flux besides soda, no alumina.
Fusion at 1350F.
Analyses:
Cushing:
1.00 Na2O 4.4 B2O3 7.27 SiO2
Conrad: (potassium instead of sodium - error?)
1.00 K2O 4.430 B2O3 7.27 SiO2
IMC:
% 7.7 Na2O 38.2 B2O3 54.1 SiO2
1.00 Na2O 4.42 B2O3 7.25 SiO2
3-Frit P2244, 64.9
Calcium Borate frit.
Manufactured by Podmore & Sons Ltd.
Analyses:
Cooper & Royle:
% 27.10 CaO 4.78 Al2O3 50.60 B2O3 17.74 SiO2
Green:
1.00 CaO 0.10 Al2O3 1.50 B2O3 0.61 SiO2
Later,
"Ils sont fous ces quebecois"
Edouard Bastarache
Irreductible Quebecois
Indomitable Quebeker
Sorel-Tracy
Quebec
edouardb@sorel-tracy.qc.ca
http://sorel-tracy.qc.ca/~edouardb/
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Linda R Hughes on wed 25 aug 04
David,
Try using Ferro Frit 3249:
Molecular formula:
Cao 0.171 Al2O3 0.357 SiO2 1.920
MgO 0.929 B2O3 1.140=20
Percentage Formula:
42.10 % SiO2
13.30 % Al2O3
12.20 % MgO
3.50 % CaO
28.90 % B2O3
Si:Al ratio: 5.4:1
Equivalent Molecular weight: 274.200
Melting Point: 1900F =20
Good luck, Linda
=20
Linda R. Hughes
mamahug@comcast.net
May you always be blessed=20
with a sense of wonderment
Tony Hansen on wed 8 sep 04
I see no one responded to this, here is a page of interest:
http://ceramic-materials.com/cermat/material/369.html
Ferro 3249 is an example of low expansion frit, it is 4.0.
This web page has a link to an interesting article on
using these frits.
-------8<--------
I have a question regarding low expansion frit in North America. A glaze
recipe I would like to start working with calls for Low expansion frit
but not specify which one. Frit 3195 has a coefficient of expansion
of 9.6, Frit 3124 is 7.9. This to me says it is a low expansion
frit relative to 3195 but is it on the world of frits?
What is a low expansion frit in North America?
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