Frits

A frit is a type of ceramic glass. It is a combination of materials that, when melted together, are rendered 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 be used alone as low temperature glazes, e.g. raku and majolica, but generally they form the basis of a glaze recipe. Walker Ceramics offers 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 lower 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.

The table below lists a detailed summary of the properties of the most commonly used frits.

Product Code
Frit Number
DescriptionUseCaONa2OK2OZnOPbOAl2O3SiO2B2O3ZrO2Mol
Wt
Soft
Temp°C
Trans.
Temp°C
COE
Linear
DA4193
KMP4193
Replaces F938
Clear, hard barium borosilicate lead free frit. E/W 1040-1100ºCDISCONTINUED
No Longer Available
0.510.190.10.10.22.860.62BaO 0.130865359064
DA4110
KMP4110
Replaces F3110 & 1078
Unleaded high alkali glaze frit. High expansion.
980-1080ºC
Copper blue and manganese purple glazes. For crackles.0.290.640.070.022.860.0928057553196
DA4124
KMP4124
Replaces F3124
Lead free calciumborosilicate frit.
E/W1040-1100ºC
0.680.280.040.162.560.5426662257774
DA4171
KMP4171
Replaces F3271 & 1057
Lead free calcium borosilicate frit.
E/W 1040-1100ºC
DISCONTINUED
No Longer Available
0.4860.5142.250.76824859055883
DA9146
KMP9102
Replaces 3302-D & 1085
Dense zircon white Lead free frit.
E/W 1040-1100ºC
E/W whites and pastel coloured glazes.0.460.416MgO
0.064
0.0580.1734.040.8360.42743162857359
DA4064
KMP4064 /3531
Lead Bi-Silicate
Replaces F4364
Lead bisilicate frit. Standard low solubility.
950-1050ºC
10.0851.9534951046572
DA4108
Replaces F4508, 3134 & 1077
Lead free calcium borosilicate frit.
E/W 1040-1100ºC
DISCONTINUED
No Longer Available
Try 60% of 3134, 40% 4131 as a substitute blend.
0.680.220.0720.6322961858378
DA4113
KMP4113
Replaces F4712
Hard lead free clear borosilicate frit.
E/W 1040-1100ºC
DISCONTINUED
No Longer Available
Try DA4131
0.60.270.130.353.50.6335365258669
DA4194
KMP4194
Replaces 5325P, 501E34, 5301 & 1012
Lead free soft sodium borosilicate frit.
High expansion
900-1060ºC
DISCONTINUED
No Longer Available
Try DA4110
0.140.660.20.292.960.67F2
0.40
32955951893
DA3134
KMP3134-2
Mix 60:40 with 4131 to replace 4108
Lead free calcium borosilicate frit.
980-1080ºC
0.680.320.0381.480.6419595
DA4131
KMP4131
Lead free sodium borosilicate frit.
1050-1100ºC
General purpose for clear glazes.0.6860.3140.3463.1650.6833167060861