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Ferro Frit CC-263

Alternate Names: Frit CC263, Frit CC268, Frit CC-268

Description: Low expansion high CaO balanced boron source

Oxide Analysis Formula
CaO 9.00% 0.56
K2O 3.00% 0.11
MgO 1.00% 0.09
Na2O 2.50% 0.14
SrO 3.00% 0.10
ZrO2 0.50% 0.01
B2O3 20.00% 1.00
Al2O3 11.00% 0.38
SiO2 50.00% 2.91
Oxide Weight 349.20
Formula Weight 349.20


This is a USA pottery frit, Ferro now calls it Frit CC263-2. It is available in small quantities at They call it an "alkaline, alkaline earth alumina borosilicate" and say it is "a well-balanced composition without barium. Typically used as an all-fritted glossy glaze in the general range Orton cone 04-4." This is likely a major constituent in their low fire glazes.

Was formerly #CC268.

Ferro only publishes an approximate analysis as of 2008, however this one was historical (from previous sources).

It is balanced cone 02-1 clear glaze.

Related Information


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 Ferro Frit CC-263-2
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 Available from Laguna Clays
Ferro Pottery Frits 2008


Co-efficient of Linear Expansion 6.79
Frit Softening Point 1650-1850F
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