jd
New Member
Posts: 12
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Post by jd on Jan 28, 2018 9:55:05 GMT -6
Ok, new to crystals and just trying to under stand. Below is a glaze that calls for Molochite, why? what is it used for in this glaze and at such a low amount of .4%? Hoping someone can help me with this. Thanks for any help on this matter.
Frit 644 45.1% Zinc 25.3% Bentonite 0.7% Molochite 0.4% Silica 28.5%
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gczop
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Posts: 202
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Post by gczop on Jan 28, 2018 18:35:49 GMT -6
Molochite is calcined epk. If bentonite is added, as a practical matter I don't see the point. G
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Post by tileman2 on Jan 28, 2018 18:52:41 GMT -6
What Gordon said. Clays are often added in once fire glaze applications: the only practical reason I can come up with. I noticed by the percentages that whoever wrote the formula was trying to apply UMF standards, which do not work on crystalline glaze. Tom
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Post by jfox on Jan 28, 2018 21:25:49 GMT -6
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gczop
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Post by gczop on Jan 28, 2018 22:26:56 GMT -6
Jim, WTF is WTF? G
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Post by graeme on Jan 29, 2018 4:01:45 GMT -6
UMF is also Universal Message Format.
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Post by tileman2 on Jan 29, 2018 5:21:32 GMT -6
UMF is Unity Molecular Formula... As per Mr. Seger. WTF is actually a protocol under the UMF standard- Weigh that First."
I am surrounded by comedians.
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jd
New Member
Posts: 12
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Post by jd on Jan 29, 2018 6:39:55 GMT -6
thank you all, that is what I thought. Could not understand why that was there either. Off to test a few more versions of this glaze. JD
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Post by mariscal on Feb 1, 2018 9:29:03 GMT -6
Hi JD, the molochite is used to reduce cracking on the surface, I use molochite is recipies 644frit 1510 frit also Is caolin calzined, molochite is a calcined kaolin at high temperatures, the molochita is also used in paints, for cars for example, lowers surface tension
AL2O3 • 2SiO2 Pm = 222 It is kaolin calcined at high temperatures, since chemical water, carbon dioxide and other volatile gases have been eliminated, thus achieving the purest form of kaolin. It is used in white pastes, porcelains and glazes
Jose
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joerg
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website: www.crystalsforever.com
Posts: 49
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Post by joerg on May 23, 2018 16:13:57 GMT -6
Hi JD, the molochite is used to reduce cracking on the surface, I use molochite is recipies 644frit 1510 frit also Is caolin calzined, molochite is a calcined kaolin at high temperatures, the molochita is also used in paints, for cars for example, lowers surface tension AL2O3 • 2SiO2 Pm = 222 It is kaolin calcined at high temperatures, since chemical water, carbon dioxide and other volatile gases have been eliminated, thus achieving the purest form of kaolin. It is used in white pastes, porcelains and glazes Jose this one and other cases... I should appreciate people mentioning the sources, from which they have copied their "information"
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gczop
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Post by gczop on May 24, 2018 7:30:56 GMT -6
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Post by tileman2 on May 24, 2018 14:55:20 GMT -6
The late Peter Issley used molochite in all of his recipes in his book: Macro Crystalline Glaze. Derek Clarkson also was a fan of molochite. Mr. Issley mentioned the same properties in his book. Molochite has the same properties as silica fume.
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Post by jfox on May 24, 2018 22:29:13 GMT -6
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gczop
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Post by gczop on May 25, 2018 8:41:48 GMT -6
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Guru
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Post by Guru on Jun 4, 2018 3:39:34 GMT -6
I need to say there's no such thing as a UMF standards. UMF very much apply on CG (same as on every other glaze/s). Some type of glazes has same/similliar patterns (like Chrome Tin Pink glazes, Fake Ash glazes, Shino glazes, ..., and especially CG) which can be plotted on the Stull Chart. In image "UMF of Crystalline glazes on Stull Chart" is region (rectangle) in which falls all CG. Yes, in that small region. UMF of Crystalline glazes on Stull ChartIn my small research "Inappropriate to appropriate" I pick up frit (Colorobbia VSA 7000) which is "Inappropriate" for CG (it has 13% Al2O3 and 12% B2O3). In the same time is 3 x cheaper than 3110 (here in Croatia). Then I formulated glaze with "inappropriate" frit on the way that I put glaze in CG region on the Stull Chart. My glaze position on Stull ChartAnd, of course - glaze work! UMF does apply on every glaze, so it apply and on CG too. Molochite is mostly used as a Al2O3 source in glaze when we already have enough clay in glaze. In UMF numbers 0.4% Molochite (in subject glaze) mean from UMF Al2O3 0.053 to 0.056. So, both glazes (with 0.4% Molochite and withouth) are in CG region. I think the idea of adding Molochite was probably to try to reduce glaze running, but the amount of 0.4 % Molochite is just too small for that aim. Best, Guru.
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