White/Black Cone 10 Engobe

Code: L3954N
Modification Date: 2019-09-18 22:59:45

For Plainsman H550, H450

MaterialAmountPercent
Nepheline Syenite10.09.8%
Silica20.019.6%
Ball Clay60.058.8%
Zircopax10.09.8%
Bentonite2.02.0%
 102.00  

Notes

This is the product of a series of tests where the percentage of nepheline syenite was progressively reduced (from 25% originally) to reduce the firing shrinkage of H550 (it is important that engobes shrink the same as the body or they will flake or crack off during firing or later during ware use). Amazingly only 10% nepheline syenite is needed to make this fit Plainsman H450, H550. Do not use this recipe on porcelains or whitewares (e.g. H570, P600), the recipe needs more nepheline for them (to increase firing shrinkage, we have another recipe, L3954J that does this).

This engobe is very plastic so it sticks well to leather hard clay.

The zircopax makes this fire quite white. If you want black, switch it to 5-10% Mason 6600. Be careful with other stains, some of them will flux and increase the fired shrinkage.

To mix this follow the instructions on using an engobe at the Digitalfire Reference Library.

Out Bound Links

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Cone 10R Base White Engobe" keywords="Cone 10 reduction black engobe for stonewares (not porcelains)." id="136" date="2019-09-14" codenum="L3954N">
<recipelines>
<recipeline material="Nepheline Syenite" amount="10.000" added="0"/>
<recipeline material="Silica" amount="20.000" added="0"/>
<recipeline material="Ball Clay" amount="60.000" added="0"/>
<recipeline material="Zircopax" amount="10.000" added="0"/>
<recipeline material="Bentonite" amount="2.000" added="0"/>
<url url="https://digitalfire.com/4sight/recipes/cone_10r_base_white_engobe_136.html" descrip="Recipe page at digitalfire.com"/>
</recipelines>
<urls/>
</recipe>
</recipes>


By Tony Hansen




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