Matrix Frit B40-C

Description: High boron zero silicate refractory calcia alumina frit

Oxide	Analysis	Formula
B2O3	40.00%	1.34
Al2O3	33.00%	0.76
CaO	24.00%	1.00
Oxide Weight		226.74
Formula Weight		226.74

Notes

Although this frit is very high in boron, it is a refractory (this might be a surprise to ceramic technicians who are accustomed to the use of boron as a powerful flux). Frits of this type have been in use to stop the penetration of aluminum in refractories since 1958 (by Carborundum Co., Metaullics Inc., Ceradyne, H-W Refractories (now ANH), and AP Green, and others). The original patent holder for these frits was Kaiser Aluminum Corp.

They are about ~1% soluble after 90 min in ~25 C water. In this way they can be used in castable cements where any appreciable amount of soluble boric oxide would retard Calcium Aluminate cement almost indefinitely.

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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.
Materials	Matrix Frit B70-A
Materials	Calcium Aluminate Cement
Oxides	B2O3 - Boric Oxide

By Tony Hansen
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