Frit VO 6255

Description: Reimbold & Strick fast firing opaque frit

Oxide	Analysis	Formula
CaO	11.00%	0.43
ZnO	12.00%	0.32
SiO2	53.00%	1.92
ZrO2	9.00%	0.16
K2O	4.00%	0.09
MgO	3.00%	0.16
Al2O3	4.00%	0.09
B2O3	4.00%	0.12
Oxide Weight		217.20
Formula Weight		217.20

Related Information

Polar Ice Porcelain with Body Stains - by Robert Barritz

Buttons of fired porcelain of many colors

Robert has done really valuable work in this research, what an amazing range of color! Surfaces are unpolished and unglazed. All are fired to cone 6. Browns are missing, they can be made using iron oxide. For blacks, Mason 6600 is also effective. The blues can be intense using lower percentages than shown here, as low as 2% can be effective. There is an optimal amount for each stain, beyond that, big increases in percentage bring less increase in color intensity. There is another reason to keep stain percentages to a minimum: To reduce the impact on body maturity (and firing shrinkage). Blues, for example, can significantly heighten the degree of vitrification, even melting the porcelain. If you plan to marble different colors, keeping stain percentage as low as possible is even more important, unless you can do fired shrinkage compatibility testing, for example, the EBCT test. Need to develop your own white porcelain? See the link below.

Links

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.
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.
URLs	http://www.reimbold-und-strick.de/images/pdf/keramisch.pdf Reimbold & Strick Frit chart with chemistry

Data

Co-efficient of Linear Expansion	63 x 10-7 (20-400C)
Frit Softening Point	700C
Glass Transition Temperature	630C

By Tony Hansen
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