Share from Insight-live.com (Lab Documentation and Calculation System) by Digitalfire.
Here is how we took the Perkins Studio Clear glaze recipe and adjusted it to prevent gelling of the slurry, reduce thermal expansion, get a better glass.
Project Name The Development of G2926B Cone 6 Clear Project Codenumber UnAssigned Notes Many transparent cone 6 glaze recipes are available on the internet. But they are not created equal. After working with many you will note several things: |
Perkins Clear
Total:100.00 Auto Unity Formula
Notes *This was among many clear glaze recipes we found on the internet. It stood out because it was crystal clear. Pictures XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Perkins Clear" id="55230" key="LZG5W3wu" date="2016-12-16" codenum="G2926"> <recipelines> <recipeline material="Nepheline Syenite" amount="30.000" tolerance=""/> <recipeline material="Gerstley Borate" amount="21.000" tolerance=""/> <recipeline material="EPK" amount="10.000" tolerance=""/> <recipeline material="Wollastonite" amount="8.000" tolerance=""/> <recipeline material="Silica" amount="31.000" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2013-12-18, Modified: 2016-12-16 17:30:21 |
Perkins Clear with Frit 3134
Total:100.10 Auto Unity Formula
Notes *This recipe makes the most obvious adjustment to Perkins Clear: Sourcing boron from a frit instead of the troublesome Gerstley Borate (it is a bubble source, gels glaze slurries, is inconsistent). Pictures G2916F Commercial Dinnerware Clear vs. G2926A (Cone 6) ![]() G2916F is sold by Plainsman Clays as Stoneware Clear. Its melting pattern is more bubble-free because its LOI is even lower (the talc in the 2926A is likely contributing these bubbles). However when used on ware these bubbles do clear. G2926 Perkins Clear vs. Fritted version G2926A ![]() Notice that the frit melts the glaze more even though the amount of boron it contributes is the same. This is good because it enables us to add more SiO2 and Al2O3 (both beneficial). Testdata LDW - LOI/Density/Water Content
XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Perkins Clear with Frit 3134" id="55231" key="GLzMPSkE" date="2016-12-16" codenum="G2926A"> <recipelines> <recipeline material="Nepheline Syenite" amount="18.300" tolerance=""/> <recipeline material="Ferro Frit 3134" amount="25.400" tolerance=""/> <recipeline material="EPK" amount="19.600" tolerance=""/> <recipeline material="Wollastonite" amount="6.900" tolerance=""/> <recipeline material="Silica" amount="27.600" tolerance=""/> <recipeline material="Talc" amount="2.300" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2014-01-30, Modified: 2016-12-16 17:46:46 |
Cone 6 Clear Glossy Base
Total:506,500.00 (R) Auto Unity Formula
Notes *The base recipe used by production at Plainsman Clays. This is our production batch, 500kg. URLs Technical informat..at digitalfire.com Mixing, adjustment..PlainsmanClays.com Pictures XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 6 Clear Glossy Base" id="180072" key="uM6uwCta" date="2021-02-12" codenum="G2926B" picturebasename=""> <recipelines> <recipeline material="Nepheline Syenite" amount="84.000" tolerance="" unitabbr="KG"/> <recipeline material="Ferro Frit 3134" amount="117.000" tolerance="" unitabbr="KG"/> <recipeline material="EPK" amount="90.000" tolerance="" unitabbr="KG"/> <recipeline material="Vansil W-30 Wollastonite" amount="32.000" tolerance="" unitabbr="KG"/> <recipeline material="Silica" amount="173.000" tolerance="" unitabbr="KG"/> <recipeline material="Silverline 303 Talc" amount="10.500" tolerance="" unitabbr="KG"/> </recipelines> </recipe> </recipes> Born: 2014-05-15, Modified: 2021-02-12 20:11:36 |
G2926B Reduced COE (MgO)
Total:100.00 Auto Unity Formula
Notes *This is an adjustment to G2926B to reduce its thermal expansion. However, before trying this, we recommend ball milling the G2926B (that will lower its expansion). Or, using a finer grade of silica, e.g. 325 mesh. Only if those do not work, then try this. Pictures G2926S after 300F:IceWater test on P300 ![]() No crazing after the test. The transparency and clarity of the glass is great, this looks very promising. P300 after 300F:IceWater test ![]() S is not crazing after two days. B crazing in the cold water. M370 with G2926S, G2926B inside ![]() Untitled ![]() XML (to paste into Insight) <?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="G2926B Reduced COE (MgO)" id="131969" key="8SXNQbqG" date="2021-02-12" codenum="G2926S"> <recipelines> <recipeline material="Nepheline Syenite" amount="20.131" tolerance=""/> <recipeline material="Ferro Frit 3134" amount="10.475" tolerance=""/> <recipeline material="Fusion Frit F-69" amount="10.311" tolerance=""/> <recipeline material="EPK" amount="12.439" tolerance=""/> <recipeline material="Wollastonite" amount="11.293" tolerance=""/> <recipeline material="Silica" amount="35.352" tolerance=""/> </recipelines> </recipe> </recipes> Born: 2014-02-19, Modified: 2021-02-12 20:17:59 |