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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.
|
Product Code
|
Description
|
Use
|
CaO
|
Na2O
|
K2O
|
MgO |
ZnO
|
BaO
|
PbO
|
Al2O3
|
SiO2
|
B2O3
|
ZrO2
|
Soft Temp |
Trans Temp |
COE
Linear
x10-7 |
Mol.
Wt
|
|
DA4193
(Replaces 938)
|
Clear, hard barium borosilicate frit. E/W 1040-1100C
|
Not for U/glaze colours
|
0.51
|
0.19
|
0.10
|
|
0.10
|
0.10
|
|
0.20
|
2.86
|
0.62
|
|
653 |
590 |
64 |
308
|
|
DA4110
(3110, 1078)
|
Leadless, soft sodium borosilicate frit.1000-1060C
|
Copper blue& manganese purple glazes
|
0.29
|
0.64
|
0.07
|
|
|
|
|
0.02
|
2.86
|
0.09
|
|
575 |
531 |
96 |
280
|
|
DA4124
(3124)
|
Leadless calcium borosilicate frit. E/W 1040-1100C
|
|
0.68
|
0.28
|
0.04
|
|
|
|
|
0.16
|
2.56
|
0.54
|
|
622 |
577 |
74 |
266
|
|
DA4171
(3271, 1057)
|
Leadless calcium borosilicate frit. E/W 1040-1100C
|
|
0.486
|
0.514
|
|
|
|
|
|
2.25
|
0.768
|
|
|
590 |
558 |
83 |
248
|
DA9146
(9102, 3302D, 1085)
|
Dense zircon white leadless frit. E/W1040-1100C
|
E/W white sand pastel coloured glazes
|
0.46
|
0.416
|
|
0.064 |
0.058
|
|
|
0.173
|
4.04
|
0.836
|
0.427
|
628 |
573 |
59 |
431
|
|
DA4064
(4364)
|
Lead bi-silicate frit. Standard low solubility. 950-1080C
|
|
|
|
|
|
|
|
1.0
|
0.085
|
1.95
|
|
|
510
|
465 |
72 |
349
|
|
DA4108
(4508, 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
|
|
618 |
583 |
78 |
229
|
|
DA4113
(4712)
|
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
|
|
652 |
586 |
69 |
353
|
|
DA4194
(5325P, 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
|
|
