Created by Glazy Admin 2015-07-16 06:59:40, updated 2015-09-25 00:27:59

Weight: 0.0000
Formula Weight: 707.5601
LOI: 10.0000
Thermal Expansion: 0.0000
Oxide SiO2 Al2O3 MgO CaO K2O Na2O Fe2O3
% Analysis 59.33 20.12 2.01 1.01 1.01 3.02 3.51
Formula 7.763 1.551 0.392 0.141 0.084 0.383 0.173

Bentonite supplies SiO2, Al2O3, Fe2O3, TiO2, and small amounts of several fluxes; bentonite helps to suspend glazes. [Generic bentonite; map to a particular type of bentonite, or use another formula. Typical density 172.0 g/c]
Bentonites contain large amounts of montmorillonite clay minerals, produced by the alteration of volcanic ash in marine environments. Montmorillonites also result from hydrothermal alteration of Mg/Fe-rich igneous rocks. Theoretical formula for montmorillonite is Al2Si4O10 (OH)2 nH2O where n is around 2-4. Mg replaces some of the Al, and Na and Ca ions hang around in the interlayer space, making for a very complex molecular structure. Bentonite consists of extremely small particles, most less than one micron. Bentonites are on the order of ten times finer than ball clays. There are two general classes of bentonites - the CaO-rich bentonites that do not swell much in water, and the CaO-poor, Na2O-rich bentonites that swell considerably.
Bentonite is the most plastic material used in ceramics. Bentonites are used to add plasticity to clay bodies and help to suspend glaze ingredients. Should be mixed with warm water before adding to clay or glaze, or mixed thoroughly with other dry ingredients.
Bentonites are so-called because they were first discovered in 1896 in Fort Benton, WY.
Analyses:
Obstler: (Western K-4; Hammill & Gillespie, 1989)
% 2.99 Na2O 0.26 K2O 2.36 MgO 4.09 CaO 17.15 Al2O3 59.4 SiO2 0.1 TiO2 3.86 Fe2O3
Obstler: (Black Hills; Ceramic Industry, 1993)
% 2.90 KNaO 2.26 MgO 0.46 CaO 20.7 Al2O3 64.32 SiO2 0.11 TiO2 3.49 Fe2O3 0.35 S
Obstler: (Wyoming Bentonite; Grimshaw,
Chemistry and Physics of Clays 1980)
% 0.43 Na2O 1.12 K2O 2.55 MgO 1.80 CaO 20.4 Al2O3 49.4 SiO2 0.4 TiO2 3.70 Fe2O3
Cooper & Royle: (Harrison Mayer Ltd. 36.0.006)
% 2.76 Na2O 0.60 K2O 2.49 MgO 0.49 CaO 20.14 Al2O3 55.44 SiO2 3.67 Fe2O3 13.50 LOI
Chappell:
Al2O3 4 SiO2 9 H2O
Chappell:
% 2.9 K2O 2.26 MgO 0.46 CaO 20.7 Al2O3 64.3 SiO2 0.11 TiO2 3.4 Fe2O3 5.15 LOI
Cushing: (White Bentonite)
% 2.58 Na2O 5.7 K2O 3.2 MgO 1.92 CaO 15.2 Al2O3 67.2 SiO2 0.16 TiO2 1.87 Fe2O3
Cushing: (Bentonite) (This is a swelling bentonite)
% 2.9 Na2O 2.3 MgO 0.45 CaO 20.7 Al2O3 64.3 SiO2 0.11 TiO2 3.5 Fe2O3 5.15 LOI 0.35 SO3
Cushing: (approximate)
Al2O3 5 SiO2 7 H2O + impurities
Tichane (CB):
% 2.6 Na2O 0.4 K2O 2.3 MgO 0.5 CaO 21 Al2O3 64 SiO2 0.1 TiO2 3.5 Fe2O3 5.2 LOI
IMC:
% 2.93 K2O 2.27 MgO 0.46 CaO 20.84 Al2O3 64.86 SiO2 0.11 TiO2 3.50 Fe2O3 5.04 LOI

Hazards

09/2016 Note: This is a new feature. If there is no safety information below, then that material's data has not yet been added. Some materials only have GHS ratings, while others only have HMIS ratings. Warnings differ between systems and countries. Glazy does not take any responsibility for accuracy of linked SDS information. Contact your ceramics supplier for safety information for your specific materials.
Globally Harmonized System (GHS) Hazardous Materials Identification System (HMIS) SDS Link
Pictograms Signal Word Hazard Statements Health Flammability Hazard Protection
Harmful WARNING Causes eye irritation
Causes skin irritation
May cause respiratory irritation

Recipes using this material

Name Amount of Bentonite Temp. Atmospheres Surface Transparency Si:Al R20:RO Author
Persimmon Celadon 3 Δ6 Oxidation
Semi-glossy Translucent 8.64 0.43 : 0.57 Ginger Lukas
Pink Nickel 4.17 Δ6 Oxidation
Matte Opaque 8.59 0.21 : 0.79 Glazy Admin
Leach White 2 Δ6 Oxidation
Semi-glossy Opaque 10.48 0.34 : 0.66 Ginger Lukas
Deep Sky Blue 2 Δ10 Oxidation
Neutral
Reduction
Glossy Translucent 7.23 0.26 : 0.74 Sid Henderson
Honey Clear 2 Δ6 8.48 0.28 : 0.72 Glazy Admin
sankey iron red 2 Δ6 - 8 Oxidation
Semi-glossy Semi-opaque 7.85 0.36 : 0.64 kenneth ibbett
Matte B from Geoff Wheeler 2 Δ6 Oxidation
Satin-matte Translucent 5.09 0.45 : 0.55 Glazy Admin
Somerset Chun 2 Δ5 - 7 Oxidation
Glossy Semi-opaque 15.69 0.23 : 0.77 Tom Demeranville
Lalone Blue Ash (toms gb variation) 2 Δ5 - 6 Oxidation
Satin-matte Semi-opaque 6.82 0.28 : 0.72 Tom Demeranville
Robin's Egg Purple 2 Δ06 - 04 Raku
Semi-glossy Translucent 6.29 0.17 : 0.83 IU Southeast Ceramics
Robin's Egg Blue 2 Δ06 - 04 Raku
Semi-glossy Translucent 6.29 0.17 : 0.83 IU Southeast Ceramics
Strontium Crystal Magic - WARM ^6 2.3 Δ5½ - 6 Oxidation
5.5 0.32 : 0.68 Tracey Lee
White Liner 2 Δ6 Oxidation
Semi-glossy Opaque 7.09 0.19 : 0.81 Jake Bish
Selsor Temmoku 2 Δ6 Oxidation
Semi-glossy 7.21 0.43 : 0.57 Jake Bish
Nutmeg 2 Δ6 - 7 Oxidation
Semi-glossy Translucent 7 0.2 : 0.8 sean byrne
Westcountry water 3 Δ6 - 7 Oxidation
Glossy Transparent 11.08 0.59 : 0.41 Tom Demeranville
Water Blue Revision 1 3 Δ6 Oxidation
Glossy Translucent 11.21 0.62 : 0.38 Ceramic Recipes
Water Blue Original 3 Δ6 Oxidation
Glossy Transparent 14.44 0.68 : 0.32 Ceramic Recipes
Val Turquoise (toms UK variation) 1 Δ6 Oxidation
Glossy 12.56 0.22 : 0.78 Tom Demeranville
Bone Ash Ivory 3 Δ9 - 10 Oxidation
Neutral
Reduction
Matte Opaque 3.89 0.15 : 0.85 Sid Henderson
Foye Turquoise 2 Δ9 - 11 Oxidation
Neutral
Reduction
Smooth Matte Opaque 5.09 0.3 : 0.7 Sid Henderson
David Beatie's Clear Base 2 Δ04 Oxidation
Glossy Transparent 7.09 0.27 : 0.73 Sid Henderson
Karens Cornish White 1 Δ6 - 7 Oxidation
Semi-glossy Semi-opaque 8.4 0.27 : 0.73 Tom Demeranville
Hill's White Modified 2 Δ6 Opaque 8.13 0.2 : 0.8 Ceramic Recipes
Arbuckle's Majolica 2 Δ04 Oxidation
Glossy Opaque 6.65 0.4 : 0.6 Sid Henderson
Red Soda 2 Δ6 - 7 Oxidation
Glossy Opaque 9.01 0.24 : 0.76 Tom Demeranville
Westcountry apple sauce 2 Δ5½ - 7 Oxidation
Semi-glossy Translucent 7.82 0.69 : 0.31 Tom Demeranville
Black Pearl 2 Δ10 Oxidation
Neutral
Reduction
Glossy Opaque 7.44 0.71 : 0.29 Ken Potter
GWU Gold Shino Glaze 2 1 Δ10 Reduction
Glossy Transparent 4.35 0.93 : 0.07 Ken Potter
Bill's Best Light Green 2 Δ6 - 7 Oxidation
Glossy Semi-opaque 25.13 0.32 : 0.68 Triin Lehismets
Lynette's Opal 2 Δ5 - 7 Oxidation
Glossy Semi-opaque 7.86 0.28 : 0.72 Triin Lehismets
Shino 7 Gold 1 Δ10 Reduction
Glossy Semi-opaque 4.69 0.89 : 0.11 Ken Potter
Simple Manganese 3 Δ10 Oxidation
Neutral
Reduction
Semi-glossy Opaque 6.78 0.95 : 0.05 Ken Potter
Simple Manganese with 10% Redart 3 Δ10 Oxidation
Neutral
Reduction
Semi-glossy Opaque 6.8 0.93 : 0.07 Ken Potter
Fish Guts 2 Δ9 - 10 Reduction
Glossy Opaque 9.96 0.22 : 0.78 Sid Henderson
EV's Blue 2 Δ5 - 7 Satin Opaque 8.58 0.22 : 0.78 Ceramic Recipes
Folk Art Guild White- 3134 Sn6.5/Zr6.5 (variation) 2 Δ5 - 6 Oxidation
Glossy 6.97 0.26 : 0.74 Allathea Joniec
Reitz Chamelion 2 Δ10 - 11 Oxidation
Reduction
Smooth Matte Opaque 4.83 0.71 : 0.29 Sid Henderson
Sarah's Clear 2 Δ4 - 12 Oxidation
Reduction
Glossy Transparent 9.1 0.28 : 0.72 chance taylor
Meloy Black 2 Δ10 - 12 Oxidation
Reduction
Satin-matte Opaque 4.35 0.28 : 0.72 chance taylor