G2926B Reduced COE (Li2O)

Code: G2926J
Modification Date: 2018-05-12 12:59:20

Ferro Frit 313415.0
Fusion Frit F-52415.0
Silverline Talc3.0


This is the best of a series of tests to lower the thermal expansion of G2926B. Separate trials of substituting ZnO, SrO, Li2O for KNaO were tried (in each the brilliant surface was being marred by an orange peel like surface). This version is a hybrid, diversifying fluxes by adding Li2O and SrO. It sources SrO from Frit 524 and Li2O from Spodumene.

The calculated expansion is dramatically lower, 5.6 vs. 6.4. This should thus be much more resistant to crazing. Of course, there is an issue: Spodumene introduces bubbles into the slurry in the bucket (washing it before use could solve this). Color response might also be different.

In Bound Links


G2926B vs J shock test

There was no crazing at 320F, but at 340F 2926B has five cracks and this has one at the edge.

It is interesting that 2926B has performed differently in different firings in this test.

2926J on P380

The surface is brilliant and clear.

G2926B vs J Cone 6 Fluidity

G2926J is flowing a little more. Fired character is very similar to B.

XML to Paste Into Insight

<?xml version="1.0"?>
<recipes version="1.0" encoding="UTF-8">
<recipe name="Low Expansion G2926B" keywords="A very low thermal expansion version of the G2926B base recipe. Use this if the B versions crazes on your clay body." id="126" date="2019-04-18" codenum="G2926J">
<recipeline material="Ferro Frit 3134" amount="15.000" added="0"/>
<recipeline material="Fusion Frit F-524" amount="15.000" added="0"/>
<recipeline material="Spodumene" amount="11.000" added="0"/>
<recipeline material="Wollastonite" amount="6.000" added="0"/>
<recipeline material="Silverline Talc" lookup="Talc" amount="3.000" added="0"/>
<recipeline material="Silica" amount="32.000" added="0"/>
<recipeline material="EPK" amount="18.000" added="0"/>
<url url="https://digitalfire.com/4sight/recipes/low_expansion_g2926b_126.html" descrip="Recipe page at digitalfire.com"/>

By Tony Hansen

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