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Hommel Frit 440

Description: Sodium borate zirconium frit (1% lead)

Oxide Analysis Formula
K2O 0.65% 0.04
Na2O 7.23% 0.72
CaO 1.71% 0.19
MgO 0.09% 0.01
PbO 1.06% 0.03
Al2O3 6.72% 0.41
B2O3 15.87% 1.42
SiO2 55.69% 5.76
ZrO2 10.93% 0.55
Oxide Weight 620.90
Formula Weight 620.90

Related Information

Links

Typecodes Leaded Frit
Frits can contain 1% or 80% PbO so this category can be misleading, check the chemistry to find out.
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.

Data

Co-efficient of Linear Expansion 6.5 x 10-6
Frit Softening Point 1580F
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