Lead Monosilicate Frit

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

Notes

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

Links

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.

Data

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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