Gerstley Borate low temperature glazes

Project Name

Gerstley Borate low temperature glazes

Project Codenumber

UnAssigned

Notes

Since Gerstley Borate has a high LOI and it seems logical that it would tend to create bubbles and imperfections in low fire glazes. However, in practice it is amazing how transparent and crystal clear some of the glazes based on it can be. This is a testament to how well it melts, even at firing temperatures below cone 06.

It is common to see Gerstley Borate in low fire glazes that also contain significant amounts of boron frit.

GB Honey Amber 04

Total:108.00

Auto Unity Formula

Notes

Pictures

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="GB Honey Amber 04" id="67242" key="PHCmApBM" date="2023-07-03" codenum="G2826F" picturebasename=""> <recipelines> <recipeline material="Ferro Frit 3124" amount="30.000" tolerance=""/> <recipeline material="Gerstley Borate" amount="26.000" tolerance=""/> <recipeline material="Nepheline Syenite" amount="20.000" tolerance=""/> <recipeline material="EPK" amount="10.000" tolerance=""/> <recipeline material="Silica" amount="10.000" tolerance=""/> <recipeline material="Lithium Carbonate" amount="4.000" tolerance=""/> <recipeline material="Iron Oxide Red" amount="8.000" added="true"/> </recipelines> </recipe> </recipes>

Born: 2000-04-18, Modified: 2023-07-03 21:40:16

GB:Frit Raku Glaze

Total:125.00

Auto Unity Formula

Notes

*For brushing: CMC and Veegum .5 each
Add mason stains to the base

Pictures

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="GB:Frit Raku Glaze" id="67238" key="gCJpWQaX" date="2023-07-03" codenum="G2826B" picturebasename=""> <recipelines> <recipeline material="Gerstley Borate" amount="25.000" tolerance=""/> <recipeline material="Ferro Frit 3195" amount="13.000" tolerance=""/> <recipeline material="Wollastonite" amount="4.200" tolerance=""/> <recipeline material="Silica" amount="1.200" tolerance=""/> <recipeline material="Ferro Frit 3124" amount="64.000" tolerance=""/> <recipeline material="EPK" amount="17.600" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2000-04-18, Modified: 2023-07-03 21:51:31

Gerstley Borate Raku Base NS/GB

Total:100.00

Auto Unity Formula

Notes

*While there are many variations on this base, the 50:50 GB:Nepheline mix is typical. We have seen versions all the way to 80% GB and 20% Nepheline. This range of blends melts very well at cone 06 and most are remarkably stable and bubble free. The higher the nepheline syenite the greater the crazing (a desired effect in many raku applications).

For mixes toward the 80:20 end we suggest adding some silica, perhaps 5-10%.

Pictures

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Gerstley Borate Raku Base NS/GB" id="67459" key="4cRDGrR1" date="2023-07-03" codenum="G2826N" picturebasename=""> <recipelines> <recipeline material="Nepheline Syenite" amount="50.000" tolerance=""/> <recipeline material="Gerstley Borate" amount="50.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2000-10-26, Modified: 2023-07-03 22:44:44