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Lead Monosilicate Frit

Oxide Analysis Formula
PbO 78.79% 1.00
SiO2 21.21% 1.00
Oxide Weight 283.28
Formula Weight 283.28


This is a standard frit formula of 1 molar part of PbO and 1 of SiO2. The powder is light yellow. However, some frits labelled as lead monosilicate are 1 part PbO and .66 of SiO2.

This ratio yields a higher percentage of PbO and thus melts at a lower temperature than lead bisilicate (1 part lead to 2 of silica).

Related Information


Materials Ferro Frit 3327
Materials H19 Frit
Materials Lead Bisilicate Frit
A standard frit of 1 molar part of PbO and 2 of SiO2. It is considered stable and non-leachable.
Materials Ceradel Frit C 1251
Materials Frit A 1316
Materials Solargil Frit FR1
Materials Ferro Frit 3377
Materials Frit 1843
Materials Lead Sesquisilicate Frit
A standard frit of 1 molar part of PbO and 1.5 of SiO2. It melts lower than a lead bisilicate.
Hazards Lead Toxicology
Typecodes Flux Source
Materials that source Na2O, K2O, Li2O, CaO, MgO and other fluxes but are not feldspars or frits. Remember that materials can be flux sources but also perform many other roles. For example, talc is a flux in high temperature glazes, but a matting agent in low temperatures ones. It can also be a flux, a filler and an expansion increaser in bodies.
Typecodes Frit
A frit is the powdered form a man-made glass. Frits are premelted, then ground to a glass. They have tightly controlled chemistries, they are available for glazes of all types.
Glossary Lead in Ceramic Glazes
Lead is a melter in ceramic glazes and performs exceptionally well and must be misused to be toxic. It is also now environmentally pervasive. It is toxic and cumulative at any level of exposure.


Co-efficient of Linear Expansion 9.3 x 10-6 (50-450C)
Density (Specific Gravity) 6.6-6.8
Frit Melting Range (C) 700-784C
By Tony Hansen
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