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Cone 6 Whiteware/Porcelain Transparent Base Glaze

Code: G2926B
Modification Date: 2018-11-01 12:59:08

A base transparent glaze recipe created by Tony Hansen for Plainsman Clays, it fires high gloss and ultra clear with low melt mobility.

MaterialAmountPercent
Nepheline Syenite18.316.6%
Ferro Frit 313425.423.1%
EPK19.617.8%
Wollastonite6.96.3%
Silica37.634.2%
Talc2.32.1%
 110.10  

Firing Schedule

Rate ()Temp ()Hold (Min)Step
108250601
350209502
1082195103
9992095304

Notes

A cone 6 transparent general purpose base recipe developed at Plainsman Clays by Tony Hansen (see link to go there below, it contains technical and mixing information about the recipe).

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 boron source). It is just as shiny and transparent, has a less fluid melt and will be harder and for stable. With this change this is a really stunning transparent glaze. We have found that it will even tolerate 5% more silica than what is shown here, yet still smooths out well. The reason why that is so good is that higher silica contents produce a more durable glass.

In our testing this glaze survives a 300F oven-to-icewater test without crazing on Plainsman M370 (25-Porcelain using Nepheline, Tile#6 Kaolin, silica and Old Hickory ball clay. It is less affected than the original when the application is too thick (minimal bubbles and crazing).

This recipe has very good suspension and application properties if you mix it as we say (dries hard, does not crack during drying, does not settle hard in the bucket and applies evenly and dries quickly).

To prepare it for use, target a specific gravity of 1.43-1.44 (equal weights of water and powder should produce a value slightly above this, fine tune it down by adding a little more water). Then add a flocculant (epsom salts, vinegar) to make it creamy. See the thixotropy glossary entry link below for more information on doing this.

Screen through 80 mesh (tiny wollastonite agglomerates are likely, they will not break down without screening).

Plainsmanclays.com makes this recipe as a premixed powder. The glazes section on their site has additional guidelines on mixing and using this recipe.

If this crazes see the links below. This glaze melts early, it is not suitable for decals.

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 Whiteware/Porcelain Transparent Base Glaze" keywords="A base transparent glaze recipe created by Tony Hansen for Plainsman Clays, it fires high gloss and ultra clear with low melt mobility." id="118" date="2018-11-01" codenum="G2926B">
<recipelines>
<recipeline material="Nepheline Syenite" amount="18.300" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Ferro Frit 3134" amount="25.400" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="EPK" amount="19.600" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Wollastonite" amount="6.900" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Silica" amount="37.600" unitabbr="kg" conversion="1.0000" added="0"/>
<recipeline material="Talc" amount="2.300" unitabbr="kg" conversion="1.0000" added="0"/>
<url url="https://digitalfire.com/4sight/recipes/cone_6_whitewareporcelain_transparent_base_glaze_118.html" descrip="Recipe page at digitalfire.com"/>
</recipelines>
<urls/>
</recipe>
</recipes>


By Tony Hansen




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