I used GlazeMaster software and came up with some formulae to test based on:

 

From: Ulrike Franck [mailto:ulrike.franck@email.de]
Sent: Friday, May 18, 2012 9:59 AM

Ulrike wrote "my idea is this one: To find out the best amount of CaO (mol, in the seger formula) for crystallisation. I have a glaze similar to Rita´s with 0.52 mol CaO. And I have tested it - with less CaO but more PbO you do not get good results. But how about more?

And how about the alumina content?

What I would like to test is this:

 

2.)

0.005 MgO  .  0.10  Al2O3  .  2.913 SiO2

0.888 CaO                              0.141 B2O3

0.023 PbO

0.077 Na2O

 

 

 

Recipe Name:  Gordon's 3134 - .1 alumina

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

14.9          Frit--Ferro 3134

2.1          Lead Monosilicate

25.5          Whiting

44.7          Silica

12.8          Ball Clay--Old Mine #4

 

100         Total

 

 

Unity          Oxide

.074           Na2O

.004           K2O

.008           MgO

.887           CaO

.027           PbO

1.000          Total

 

.104           Al2O3

.144           B2O3

.004           Fe2O3

 

2.843           SiO2

.006           TiO2

 

27.4          Ratio

6.7            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

 

3.)

 0.027 PbO .  0.179 Al2O3  .  2.913 SiO2

 0.95 CaO                              0.141 B2O3

 0.077 Na2O

 

 

Recipe Name:  Gordon's 3134 - .95 CaO

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

.3          Frit--Ferro 3134

2.2          Lead Monosilicate

33.9          Whiting

25.1          Silica

24.8          Ball Clay--Old Mine #4

13.7          Gerstley Borate--1999

 

100         Total

 

 

Unity          Oxide

.02           Na2O

.006           K2O

.011           MgO

.938           CaO

.024           PbO

1.000          Total

 

.191           Al2O3

.127           B2O3

.005           Fe2O3

 

1.713           SiO2

.009           TiO2

 

9          Ratio

7.4            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

4.)

 0.027 PbO .  0.10 Al2O3  .  2.913 SiO2

 0.95 CaO                              0.141 B2O3

 0.077 Na2O

 

 

Recipe Name:  Gordon's 3134 - .95 CaO - .1 Alumina

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

15          Frit--Ferro 3134

2          Lead Monosilicate

25          Whiting

45.1          Silica

13          Ball Clay--Old Mine #4

 

100.1         Total

 

 

Unity          Oxide

.075           Na2O

.004           K2O

.008           MgO

.886           CaO

.026           PbO

1.000          Total

 

.107           Al2O3

.147           B2O3

.004           Fe2O3

 

2.91           SiO2

.006           TiO2

 

27.3          Ratio

6.6            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

5.)

0.005 MgO  .  0.179 Al2O3  .  2.913 SiO2

0.52 CaO                              0.141 B2O3

0.023 PbO

0.10 Na2O

0.10 K2O

0.252 ZnO

 

 

Recipe Name:  Gordon's 3134 - .52 CaO -.252 ZnO

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

14.3          Frit--Ferro 3134

2          Lead Monosilicate

15.1          Whiting

40.7          Silica

20.4          Kaolin--EPK

7.5          Zinc Oxide

 

100         Total

 

 

Unity          Oxide

.073           Na2O

.003           K2O

.005           MgO

.611           CaO

.281           ZnO

.027           PbO

1.000          Total

 

.23           Al2O3

.145           B2O3

.003           Fe2O3

 

2.883           SiO2

.002           TiO2

.001           P2O5

 

12.5          Ratio

6.4            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

6.)

0.005 MgO  .  0.10 Al2O3  .  2.913 SiO2

0.52 CaO                              0.141 B2O3

0.023 PbO

0.10 Na2O

0.10 K2O

0.252 ZnO

 

Recipe Name:  Gordon's 3134 - .52 CaO, .252 ZnO, .1 Al2O3

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

20.4          Frit--Ferro 3134

2.8          Lead Monosilicate

14          Whiting

46.1          Silica

9.8          Kaolin--EPK

7          Zinc Oxide

 

100.1         Total

 

 

Unity          Oxide

.098           Na2O

.001           K2O

.003           MgO

.611           CaO

.249           ZnO

.036           PbO

1.000          Total

 

.106           Al2O3

.196           B2O3

.002           Fe2O3

 

2.898           SiO2

.001           TiO2

0           P2O5

 

27.3          Ratio

6.5            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

I also came up with this one which hopefully duplicate Gordon's 3134 while using Gerstley Borate.

 

Recipe Name:  Gordon's Gerstley

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

12.3          Gerstley Borate--1999

1.9          Feldspar--Custer

1.7          Soda Ash

.4          Dolomite

23.6          Whiting

14          Kaolin--EPK

.3          Rutile

44          Silica

1.9          Lead Monosilicate

 

100.1         Total

 

 

Unity          Oxide

.073           Na2O

.008           K2O

.013           MgO

.879           CaO

.027           PbO

1.000          Total

 

.203           Al2O3

.145           B2O3

.003           Fe2O3

 

2.883           SiO2

.013           TiO2

0           P2O5

 

14.2          Ratio

6.6            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------

 

And this one using no lead.

 

Recipe Name:  Gordon's 3134 no lead

 

Cone:       Color: 

Firing:       Surface: 

 

Amount     Ingredient

14.2          Frit--Ferro 3134

24.4          Whiting

37          Silica

24.4          Ball Clay--Old Mine #4

 

100         Total

 

 

Unity          Oxide

.077           Na2O

.008           K2O

.012           MgO

.903           CaO

1.000          Total

 

.208           Al2O3

.146           B2O3

.006           Fe2O3

 

2.938           SiO2

.011           TiO2

 

14.1          Ratio

6.6            Exp

 

Comments: 

-----------------------------------

Calculations by GlazeMaster™

www.masteringglazes.com

------------------------------------