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Fusion Frit F-309

Alternate Names: Fusion Frit F309

Description: Calcium borate frit, Gerstley Borate substitute

Oxide Analysis Formula
CaO 18.00% 0.61
MgO 4.30% 0.20
Na2O 6.20% 0.19
B2O3 45.00% 1.23
Al2O3 2.50% 0.05
SiO2 24.00% 0.76
Oxide Weight 189.55
Formula Weight 189.55

Related Information

Links

Materials Pemco Frit P-2201
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 Fusion Frit F-77
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.

Data

Co-efficient of Linear Expansion 6.39 x 10-6
Frit Melting Range (C) 1400F
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