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PotteryCrafts Frit P2954

Alternate Names: PotteryCrafts Frit 2954

Description: Calcium Borate Frit similar to Gerstley Borate

Oxide Analysis Formula
CaO 26.50% 0.99
B2O3 50.30% 1.51
Al2O3 4.90% 0.10
SiO2 17.90% 0.62
MgO 0.10% 0.01
K2O 0.30% 0.01
Oxide Weight 209.19
Formula Weight 209.19


Chemistry similar to colemanite
We have another analysis that does not specify the MgO and K2O:
SiO2 17.7, Al2O3 4.8, CaO 27.1, B2O3 50.4

Related Information


Materials Colemanite
A natural source of boron that melts at a very low temperature.
Materials Frit
Frits are made by melting mixes of raw materials, quenching the melt in water, grinding the pebbles into a powder. Frits have chemistries raw materials cannot.
Materials BPS Calcium Borate Frit
Materials Matthey Calcium Borate Frit
Materials Ferro Frit 1081
Materials Ferro Frit 4112
A calcium borate frit (with extremely high boron).
Materials Potclays Frit 2268
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.
Typecodes Gerstley Borate Substitutes
Many development efforts to create Gerstley Borate substitutes took place during the early 2000s (the initial period when the demise of Gerstley Borate appeared imminent). A number of companies, including Laguna Clays itself, produced and sold these for many years. When Laguna secured another stockpile at the mine and began producing the original material again, interest in substitutes gradually waned. However, the sudden dramatic price increase in 2023 appears to have initiated the process again. Gillespie Borate appears to be the only viable and visible substitute now. Thus, the substitutes listed here are mostly no longer made. Other high-boron materials shown are also no longer available. We continue to recommend sourcing B2O3 from frits instead. Please contact us if you have a specific recipe and we can work with you in your Insight-live account to develop a new recipe that both eliminates the GB and improves overall working and firing properties.
PotteryCrafts Frit information


Co-efficient of Linear Expansion 6.1
Frit Melting Range (C) 1050-1160C
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