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Cone 6 Stoneware/Whiteware Glossy Base Glaze

Code: G2916F
Modification Date: 2018-06-16 22:45:56
Member of Group: Cone 6

Crystal clear industrial dinnerware glaze

MaterialAmount
Fusion Frit F-52417.8
Talc2.9
Silica28.4
Old Hickory #5 Ball Clay7.7
Wollastonite15.4
Nepheline Syenite25.7
Additions
Bentonite1.9
 99.80  

Notes

This is an industrial tableware glaze recommended by tech support at Fusion Frits. It not only fires hard and crystal clear but has outstanding suspension and application properties. You may think that you already have a good transparent cone 6 glaze, but try comparing it side-by-side with this (especially on a porcelain piece).

The magic for the way this glaze fires and its hardness and durability lie in the variety of fluxes in contains and the very low boron content coupled with high SiO2 and Al2O3. The fluxes most likely to create micro-bubbles at this temperature are sourced in a frit. It has the traditional CaO and KNaO, but the talc adds MgO and the frit adds SrO plus a tiny bit of BaO. This mixed-oxide effect produces a very well melting glaze yet having excellent body (considering it has only 18% of a low-boron frit).

Plainsmanclays.com makes this recipe as a premixed powder. But they will also have a stock of the frit if you want to make your own. The glazes section of thier site has additional guidelines on this use of this recipe.

Cautions In Mixing Your Own Glaze

-Screening at 80 mesh is required during preparation if your wollastonite has agglomerated (otherwise your slurry will be full of tiny lumps).

-Fusion recommends 325 mesh silica and A400 nepheline syenite, but we have been using regular 200 silica and 270 nepheline with good success for stoneware.

-The recipe originally used #1 Glaze Ball Clay, but we have switched to a very similar more commonly available product, Old Hickory #5 (it has the same kaolin-like nature of #1 Glaze). These two ball clays are dramatically better than others for suspending glazes, mix this with another and you may get a poor working-properties preview of this otherwise very good recipe. In addition, these ball clays are higher in Al2O3 than typical (29% vs 25%), so there is a slight chemistry impact in using another.

-Use your own bentonite if you cannot get the Milwhite Bentonite B. Milwhite is low in iron, use the cleanest bentonite you have.

To prepare it for use, target a specific gravity of 1.5 (divide the total weight of powder by 1.08 to derive the amount of water to use). Add a flocculant (epsom salts, vinegar) to make it creamy. See the thixotropy glossary entry link below for more information on doing this.

Out Bound Links

In Bound Links

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Cone 6 Stoneware/Whiteware Glossy Base Glaze" keywords="Crystal clear industrial dinnerware glaze" id="115" date="2018-06-16" codenum="G2916F" altcodenum="MK3330" location="Box 34">
<recipelines>
<recipeline material="Fusion Frit F-524" amount="17.800" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Talc" amount="2.900" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Silica" amount="28.400" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Old Hickory #5 Ball Clay" amount="7.700" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Wollastonite" amount="15.400" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Nepheline Syenite" amount="25.700" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Bentonite" amount="1.900" unitabbr="kg" conversion="1.0000" added="1"/>
<url url="https://digitalfire.com/4sight/recipes/cone_6_stonewarewhiteware_glossy_base_glaze_115.html" descrip="Recipe page at digitalfire.com"/>
</recipelines>
<urls/>
</recipe>
</recipes>


By Tony Hansen




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