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FRITS
A frit is a type of ceramic glass. It is a combination of materials
which are melted together to render them insoluble and resistant to acid attack.
They are, therefore a means of introducing certain materials into a glaze which
would otherwise be toxic. Frits can used alone as low temperature glazes; e.g.
Raku and Majolica, but generally they form the basis of a glaze recipe. Walker
Ceramics offer a large range of frits and for those wishing to incorporate the frits in glaze calculations, molecular formulae
are listed.
LEAD FRITS
Glazes based on lead frits produce a shiny, durable finish
and give brightness and clarity of colour when used in conjunction with oxides,
stains, slips etc. While they can be used on all earthenware clays, they are
particularly suitable for red clay.
BORAX FRITS
Borax frits are often used in the production of earthenware
glazes when a lead-free glaze is required. Slight milkiness, especially at low
temperatures, may be evident over red clays, and the colour response with
oxides, etc. is not usually so vivid as with lead frits.
ALKALINE FRITS
Similar to borax frits, alkaline frits are noted for their
high soda and potash content. The colour response from copper and manganese is
turquoise and purple/brown respectively - typical of this type of frit. Alkaline
frits have a high expansion rate which makes them a suitable base for crackle
glazes.
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Product Code
|
Description
|
Use
|
CaO
|
Na2O
|
K2O
|
ZnO
|
BaO
|
PbO
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Al2O3
|
SiO2
|
B2O3
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ZrO2
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Mol.
Wt
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DA4193
replaces F938.
|
Clear, hard barium borosilicate frit. E/W 1040-1100C
|
Not for U/glaze colours
|
0.51
|
0.19
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0.10
|
0.10
|
0.10
|
|
0.20
|
2.86
|
0.62
|
|
308
|
|
DA4110
replaces F3110, 1078.
|
Leadless, soft sodium borosilicate frit.1000-1060C
|
Copper blue& manganese purple glazes
|
0.29
|
0.64
|
0.07
|
|
|
|
0.02
|
2.86
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0.09
|
|
280
|
|
DA4124
replaces F3124.
|
Leadless calcium borosilicate frit. E/W 1040-1100C
|
|
0.68
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0.28
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0.04
|
|
|
|
0.16
|
2.56
|
0.54
|
|
266
|
|
DA4171
replaces F3271, 1057.
|
Leadless calcium borosilicate frit. E/W 1040-1100C
|
|
0.486
|
0.514
|
|
|
|
|
2.25
|
0.768
|
|
|
248
|
DA9146
replaces 9102, 3302D, 1085.
|
Dense zircon white leadless frit. E/W1040-1100C
|
E/W white sand pastel coloured glazes
|
0.46
|
0.416
|
MgO 0.064
|
0.058
|
|
|
0.173
|
4.04
|
0.836
|
0.427
|
431
|
|
DA4064
replaces F4364.
|
Lead bi-silicate frit. Standard low solubility. 950-1080C
|
|
|
|
|
|
|
1.0
|
0.085
|
1.95
|
|
|
349
|
|
DA4108
replaces F4508, 3134, 1077.
|
Leadless calcium borosilicate frit E/W 1040-1100C
|
Special effects for Raku glazes
|
0.68
|
0.22
|
|
|
|
|
0.07
|
2.00
|
0.63
|
|
229
|
|
DA4113
replaces F4712.
|
Hard leadless clear borosilicate frit E/W 1040-1100C
|
General purpose for developing colours
|
0.60
|
0.27
|
0.13
|
|
|
|
0.35
|
3.5
|
0.63
|
|
353
|
|
DA4194
replaces F5325P, 501E34, 5301, 1012.
|
Leadless soft sodium borosilicate frit. 900-1060C
|
Raku glazes
|
0.14
|
0.66
|
0.20
|
|
|
|
0.29
|
2.96
|
0.67
|
F2 0.40
|
329
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© Ozclay Pty.Ltd
2008
Reproduction for commercial use is prohibited.
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