Lead Bisilcate B-15

Description: Lead alumina bilsilicate frit (with 1% TiO2)

Oxide	Analysis	Formula
PbO	63.00%	1.00
Al2O3	2.00%	0.07
SiO2	34.00%	2.00
TiO2	1.00%	0.04
Oxide Weight		354.29
Formula Weight		354.29

Related Information

Lead bisilicate frit data sheet claims high resistance to leaching

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Notice it is specifically "formulated for use in pottery glazes". And that "Lead bisilicate is extremely resistant to leaching by dilute acids, including gastric juices, which reduces its toxicity and offers the maximum safety of any of the lead products." In many countries, the use of lead glazes is still considered normal and safe. There is zero use of lead in pottery glazes in North America. Is it possible that we have tarred all lead products with the same brush? Could we at least be using it on non-functional decorated surfaces of low-fire stoneware? This would drastically reduce the energy consumption of kilns.

Links

Materials	Ceraflux An alumina lead bisilicate from Hammond Lead Products in Indiana. The data sheet claims it is safe and insoluble in stomach acid.
Materials	Lead Bisilicate Frit A standard frit of 1 molar part of PbO and 2 of SiO2. It is considered stable and non-leachable.
Typecodes	Leaded Frit Frits can contain 1% or 80% PbO so this category can be misleading, check the chemistry to find out.

Data

Density (Specific Gravity)	4.65-4.95
Frit Melting Range (C)	788-816C

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