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dimanche 6 novembre 2011

Notions Générales General Information

La Colemanite n'est plus disponible en Amérique du Nord
et il n'existe pas de substitution 1 pour 1.
La Fritte Ferro 3211 n'existe plus non plus sur le marché
nord-américain. Nous avons quand même calculé des
substitutions avec l'analyse chimique de cette fritte en
notre possession car il existe une fritte semblable sur le
marché européen, la Fritte Johnson-Matthey 3221, qui
peut être utilisée sur une base 1 pour 1.
Le Cadycal a aussi son pendant européen, la Fritte Richoux P-2954

Substitutions calculées
avec le logiciel Glazes4 de Chris Hogg
(Angleterre)

Colemanite 100=

Fritte Ferro 3211 88
Fritte Ferro 3134 12
--------------------------------------
Cadycal 74
Gerstley Borate 18
Carbonate de Calcium 8
---------------------------------
Fritte Ferro 3211 73
Gerstley Borate 27
---------------------------------
Fritte Ferro 3211 78
Fritte Ferro 3134 4
Gerstley Borate 18

Il y a plusieurs substitutions du Gerstley Borate
disponibles, avec des matériaux Européens, chez :

http://smart2000.pagesperso-orange.fr/gerstley_borate0.htm

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

EPK signifie Edgar Plastic Kaolin, il est extrait en Floride et il
est le plus populaire auprès des céramistes de ce coté-ci de
l'Atlantique.

Whiting = Carbonate de calcium

Équivalences
Américain = Français
1-Feldspath Potassique Custer = Feldspath ICE 10B (DAM)
2-Ferro Fritte 3211 = Fritte Johnson-Matthey 3221
3-Cadycal = Fritte Richoux P-2954

Autres moyens de substituer pour la Colemanite :
http://whitesvo.blogspot.ca/

Base de Données de Matières Premières chez Smart.Conseil :

http://smart2000.pagesperso-orange.fr/gerstley_borate0.htm#base%20de%20donnes%20matieres

Le choix de ces recettes a été grandement inspiré par
le livre de James Chappell.

Référence :
The Potters Complete Book of Clay and Glazes par
James Chappell, édité en 1977 aux USA.
========================================

Colemanite is not available anymore in North
America, there is no 1 for 1 substitution.
Also, Ferro Frit 3211 is not available on the north
american market anymore. But, there is a 1 for 1
substitute for it in Europe, Johnson-Matthey Frit 3221.
So, we calculated substitutions with the analysis of
Ferro Frit 3211 in the case a similar frit becomes
available here.
Cadycal may be substituted for on a 1 for 1 basis by
Richoux Frit P-2854.

Substitutions
calculated with Chris Hogg’s programme,
Glazes4 (England)

Colemanite 100 =

Ferro Frit 3211 88
Ferro Frit 3134 12
--------------------------------------
Cadycal 74
Gerstley Borate 18
Whiting 8
---------------------------------
Ferro Frit 3211 73
Gerstley Borate 27
---------------------------------
Ferro Frit 3211 78
Ferro Frit 3134 4
Gerstley Borate 18

There are many substitutions for Gerstley Borate
with European materials
now available on :

http://smart2000.pagesperso-orange.fr/gerstley_borate0.htm

EPK means Edgar Plastic Kaolin, it is extracted in Florida and is
the most popular among ceramists on this side of the Atlantic ocean.

Other ways to substitute for Colemanite :
http://whitesvo.blogspot.ca/


The choice of the recipes was greatly influenced by James Chapell’s book

Reference :
The Potters Complete Book of Clay and Glazes par James Chappell,
edited in 1977 in the USA

Colemanite Glaze #1 Gloss/Transparent

Colemanite 32
Silica 30
Custer feldspar 20
Talc 14
EPK 4
Total 100

Bentonite 2

Na2O 0.04 Al2O3 0.17 SiO2 2.86
K2O 0.07 B2O3 0.73 P2O5 0.00
MgO 0.33 TiO2 0.00
CaO 0.56 Fe2O3 0.00
MnO 0.00

Alumina:Silica ratio is 1.00:17.18
Neutral:Acid ratio is 1.00:3.18
Alk:Neut:Acid ratio is 1.00:0.90:2.86

Expansion: 57.1 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

Colemanite Glaze #2 Gloss/Transparent

Lepidolite 50
Colemanite 26
Zinc oxide (Calc.) 4
Silica 20
Total 100

Bentonite 2

Na2O 0.01 Al2O3 0.42 SiO2 2.45
K2O 0.17 B2O3 0.58 TiO2 0.00
MgO 0.02 Fe2O3 0.00
CaO 0.41
Li2O 0.24
ZnO 0.15

Alumina:Silica ratio is 1.00:5.82
Neutral:Acid ratio is 1.00:2.46
Alk:Neut:Acid ratio is 1.00:1.00:2.45

Expansion: 68.0 x 10e-7 per degree C
Oxides causing abnormal expansion: Li2O B2O3

Colemanite Glaze #3 Gloss/Transparent

Colemanite 45
EPK 10
Kaolin (Calc.) 9
Silica 36
Total 100

Na2O 0.00 Al2O3 0.32 SiO2 3.37
K2O 0.00 B2O3 1.49 P2O5 0.00
MgO 0.00 TiO2 0.00
CaO 0.99 Fe2O3 0.00

Alumina:Silica ratio is 1.00:10.60
Neutral:Acid ratio is 1.00:1.87
Alk:Neut:Acid ratio is 1.00:1.81:3.38

Expansion: 52.7 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

Colemanite Glaze #4 Gloss/Transparent

Custer feldspar 48
Colemanite 23
Silica 11.5
Barium carbonate 9
EPK 5
Zinc oxide (Calc.) 3.5
Total 100

Bentonite 1

Na2O 0.08 Al2O3 0.36 SiO2 2.82
K2O 0.19 B2O3 0.60 P2O5 0.00
MgO 0.00 TiO2 0.00
CaO 0.41 Fe2O3 0.00
ZnO 0.15
BaO 0.16

Alumina:Silica ratio is 1.00:7.76
Neutral:Acid ratio is 1.00:2.94
Alk:Neut:Acid ratio is 1.00:0.96:2.83

Expansion: 76.1 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

Colemanite Glaze #5 Gloss/Transparent

Colemanite 50
EPK 14
Silica 34
Magnesium carbonate 2
Total 100

Bentonite 1

Na2O 0.00 Al2O3 0.20 SiO2 2.55
K2O 0.00 B2O3 1.36 P2O5 0.00
MgO 0.09 TiO2 0.00
CaO 0.91 Fe2O3 0.00

Alumina:Silica ratio is 1.00:12.76
Neutral:Acid ratio is 1.00:1.64
Alk:Neut:Acid ratio is 1.00:1.56:2.55

Expansion: 53.9 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3

Colemanite Glaze #6 Gloss/Transparent

Ball clay 51
Colemanite 49
Total 100

Na2O 0.01 Al2O3 0.55 SiO2 1.98
K2O 0.02 B2O3 1.40 TiO2 0.04
MgO 0.02 Fe2O3 0.02
CaO 0.95

Alumina:Silica ratio is 1.00:3.58
Neutral:Acid ratio is 1.00:1.04
Alk:Neut:Acid ratio is 1.00:1.95:2.03

Expansion: 60.4 x 10e-7 per degree C
Oxides causing abnormal expansion: B2O3