Lead Sesquisilicate Frit

Alternate Names: 2PbO.3SiO₂

Oxide	Analysis	Formula
PbO	71.23%	1.00
SiO2	28.77%	1.50
Oxide Weight		313.35
Formula Weight		313.35

Notes

This term refers to frits having 1 molar part of lead and 1.5 of silica.
This ratio yield a higher percentage of PbO and thus melts at a slightly lower temperature than lead bisilicate (1 part lead to 2 of silica).

Related Information

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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	Lead Monosilicate Frit A standard frit of 1 molar part of PbO and 1 of SiO2. It melts lower than a lead bisilicate.
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

Frit Softening Point	860-1040C M

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