Cone 04 MgO matte - Is is possible?

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Cone 06-04 MgO Matte

Code #

G1916S

Materials Amt
FERRO FRIT 3249 30.000 28.57%
FERRO FRIT 3134 (Frit 3134) 30.000 28.57%
KAOLIN 20.000 19.05%
Nepheline Syenite 20.000 19.05%
Talc 5.000 4.76%

Total:105.00

Auto Unity Formula

CaO 0.36
MgO 0.38
K2O 0.03
Na2O 0.23
(KNaO) 0.26
B2O3 0.64
Al2O3 0.49
SiO2 2.45

Ratios

Si:Al: 5.0:1
SiB:Al: 6.3:1
R2O:RO: 0.3:0.7

Expansion

6.6 (Molar:6.5)

LOI

2.7

Cost

1.26 per kg

Notes

*This project is to see if we can make a good matte glaze at cone 04 using high MgO (like at medium or high temperature).

From the G1916 base this reduces the CaO for MgO, increases B2O3 to melt it better (to accommodate the MgO, and increased Al2O3).

The expansion is low, that should prevent crazing.

If this does not work try sourcing the MgO from Mag Carbonate (traditionally done for matte glazes at low fire).

Pictures

Typecodes

ST-Untitled typecode

Alternate Code Number:GS04-1

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 06-04 MgO Matte" id="89212" key="ix1JXcox" date="2022-10-07" typecodes="ST" codenum="G1916S" email="jjpotts@jjpotts.com" picturebasename=""> <recipelines> <recipeline material="FERRO FRIT 3249" amount="30.000" tolerance=""/> <recipeline material="FERRO FRIT 3134" lookup="Frit 3134" amount="30.000" tolerance=""/> <recipeline material="KAOLIN" lookup="Kaolin" amount="20.000" tolerance=""/> <recipeline material="Nepheline Syenite" amount="20.000" tolerance=""/> <recipeline material="Talc" amount="5.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2006-03-16, Modified: 2022-10-07 22:25:33

Cone 06-04 MgO (using talc)

Code #

G1916S1

Materials Amt
FERRO FRIT 3249 0.00%
FERRO FRIT 3195 60.000 55.05%
KAOLIN 16.000 14.68%
Nepheline Syenite 16.000 14.68%
Talc 17.000 15.60%

Total:109.00

Auto Unity Formula

CaO 0.36
MgO 0.39
K2O 0.02
Na2O 0.23
(KNaO) 0.25
B2O3 0.56
Al2O3 0.49
SiO2 2.74

Ratios

Si:Al: 5.6:1
SiB:Al: 6.7:1
R2O:RO: 0.3:0.7

Expansion

6.5 (Molar:6.3)

LOI

2.7

Notes

*Frit 3195 and 3134 have less B2O3 and more SiO2.

Pictures

Typecodes

ST-Untitled typecode

Alternate Code Number:GS04-1

XML (to paste into Insight)

<?xml version="1.0"?> <recipes version="1.0" encoding="UTF-8"> <recipe name="Cone 06-04 MgO (using talc)" id="225231" key="oWC9wPBk" date="2022-10-07" typecodes="ST" codenum="G1916S1" email="jjpotts@jjpotts.com" picturebasename=""> <recipelines> <recipeline material="FERRO FRIT 3249"/> <recipeline material="FERRO FRIT 3195" amount="60.000" tolerance=""/> <recipeline material="KAOLIN" amount="16.000" tolerance=""/> <recipeline material="Nepheline Syenite" amount="16.000" tolerance=""/> <recipeline material="Talc" amount="17.000" tolerance=""/> </recipelines> </recipe> </recipes>

Born: 2006-03-16, Modified: 2022-10-07 22:34:43