Modification Date: 2017-07-19 22:24:03
Incorporates some MgO (at the expense of CaO, KNaO) to reduce the thermal expansion of G1214M 5x20 glaze.
This glaze adjusts G1214M 5x20 to reduce its thermal expansion (incorporating MgO). It goes in the same direction as G1215U but does not add as much MgO and sources it from Talc instead of Ferro Frit 3249. The MgO is added at the expense of CaO, KNaO. Boron has also been increased a little. The thermal expansion has gone from 7.0 to 6.5. The two frits here are tuned to supply enough Al2O3 to keep the kaolin low enough to prevent shrinkage cracks on drying.
This glaze survives and 300F oven:ice-water crazing test on Plainsman M370.
It works well as a white (with 10% zirconium silicate) and as a black (5% Mason 6666 black stain).
However some users find that this do fire as glassy as our standard G2926B recipe.
Out Bound Links
Substitute for low expansion cone 6 G1215U, this sources MgO from talc instead of a frit
2013-05-29 - During 2013 we saw problems with the G1215U low expansion glossy that we had been recommending from some years. It was not melting to a completely ult...
A recipe sourcing high MgO (from Ferro Frit 3249) to produce a low expansion glass resistant to crazing on lower silica porcelains.
2003-12-18 - The original impetus to create this recipe was to reduce the thermal expansion of the G1214M and G1215W recipes to work better on porcelains (the othe...
This is a base transparent glaze recipe developed for cone 6. It is known as the 20x5 or 20 by 5 recipe. It is a simple 5 material at 20% each mix and it makes a good home base from which to rationalize adjustments.
MgO is the secret weapon of craze control. If your application can tolerate it you can create a cone 6 base glaze of very low thermal expansion that is very resistant to crazing.
Crystal clear industrial dinnerware glaze
2013-09-26 - This is an industrial tableware glaze recommended by tech support at Fusion Frits. It not only fires hard and crystal clear but has outstanding suspen...
In Bound Links
A base transparent glaze recipe created by Tony Hansen for Plainsman Clays, it fires high gloss and ultra clear with low melt mobility.
2014-02-06 - This is an adjustment to an original recipe named Perkins Studio Clear (it contains alot more SiO2 and uses a frit instead of Gerstley Borate as the b...
By Tony Hansen+