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Red Lead

Alternate Names: Minium, Lead(II,IV) oxide

Oxide Analysis Formula
PbO 97.67% 1.00
Oxide Weight 223.20
Formula Weight 228.52


A powerful low fire flux. Once popular for its ability to produce glazes of very good flow qualities without pinholes or other defects. It also has powerful and vibrant color responses to metallic oxides.

Related Information


Hazards Lead Toxicology
Hazards Lead in Ceramic Glazes: What Did We Learn?
The long slow death of lead use in ceramics taught us some lessons. Manufacturers who still use acid tests to determine glaze toxicity risk liability.
Materials Litharge
Materials Lead Bisilicate Frit
Typecodes Generic Material
Generic materials are those with no brand name. Normally they are theoretical, the chemistry portrays what a specimen would be if it had no contamination. Generic materials are helpful in educational situations where students need to study material theory (later they graduate to dealing with real world materials). They are also helpful where the chemistry of an actual material is not known. Often the accuracy of calculations is sufficient using generic materials.
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.
Oxides PbO - Lead Oxide


Frit Softening Point880C M
Density (Specific Gravity)9.00

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