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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

Links

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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