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G2934 Low-LOI Variant

Code: G2934Y
Modification Date: 2018-12-11 16:11:51

Ferro Frit 324910.0
Nepheline Syenite10.5
Calcined Kaolin10.5


This is an MgO matte. High MgO content is a common matting mechanism at cone 10 but also works at cone 6. This recipe has the same chemistry as the widely used G2934, however it sources the MgO from a frit and talc rather than from dolomite (which can vary from brand to brand). Not only will this make your results match ours, but also produce a much lower LOI (3.8 vs. 13.6), a smoother fired surface and better melt fluidity to host stains (stains look fantastic in this base).

Fusion Frit F-69 can be used instead of Ferro Frit 3249 (actually, it is better). This recipe employs a mix of calcined and raw kaolin to keep the drying shrinkage down (to avoid cracking on drying). If you use pure kaolin it will likely crack during drying. If you do not have calcined kaolin you can make your own (bisque fire a container of powder).

This glaze has a very low thermal expansion and will not craze an any common clay body. It accepts stains exceptionally well.

We recommend doing cutlery marking tests on your ware. If they mark, blend in a little transparent glossy glaze (like G2926B). This will compromise the matteness a little but will reduce the marking.

Again, although matte in appearance, this glaze has a high melt fluidity. That means that brush-on colors could bleed. However if you keep it thin enough this should not be an issue. If it is consider using the G2934 original recipe.

1100 water, 1000 powder to get creamy mix.
Regular 2934 (with dolomite) took more water, about 1300. Nicer surface than G2934, same matteness, better fluidity.

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In Bound Links

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Cone 6 Magnesia Matte Low LOI Version" keywords="The same chemistry as the widely used G2934 but the MgO is sourced from a frit and talc instead of dolomite" id="135" date="2017-10-19" codenum="G2934Y">
<recipeline material="Ferro Frit 3249" amount="10.000" added="0"/>
<recipeline material="Nepheline Syenite" amount="10.500" added="0"/>
<recipeline material="Wollastonite" amount="21.500" added="0"/>
<recipeline material="Talc" amount="14.000" added="0"/>
<recipeline material="EPK" amount="20.500" added="0"/>
<recipeline material="Silica" amount="13.000" added="0"/>
<recipeline material="Calcined Kaolin" amount="10.500" added="0"/>
<url url="" descrip="Recipe page at"/>

By Tony Hansen

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