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
Carmen's Turquoise (tom's add more clay variation) 2 Δ6 - 7 Oxidation
Satin 4.79 0.33 : 0.67 Tom Demeranville
Toms Snowflake 2 Δ6 - 7 Oxidation
Semi-glossy Translucent 4.86 0.67 : 0.33 Tom Demeranville
Devon frozen water 2 Δ5½ - 7 Oxidation
Semi-matte Semi-opaque 10.57 0.19 : 0.81 Tom Demeranville
Woo Blue Brown 2 Δ10 Reduction
Glossy 9.38 0.29 : 0.71 Glazy Admin
Pumpkin 1.94 Δ10 Reduction
4.66 0.23 : 0.77 Glazy Admin
Test Blue 2 Δ9 - 10 Reduction
Glossy Opaque 5.84 0.27 : 0.73 Hailey Smither
Splotchy Lavender Cone 10 1 Δ9 - 10 Oxidation
Reduction
4.65 0.28 : 0.72 Clemson University---Ceramic Dept.
Clemson Snow White Stoneware 1 Δ9 - 10 Oxidation
Reduction
6.27 0.85 : 0.15 Clemson University---Ceramic Dept.
Uarts Makins Porcelain Casting Slip 0.5 Δ6 Oxidation
Reduction
4.1 0.9 : 0.1 Clemson University---Ceramic Dept.
GVSU (Staley) Deflocculated Porcelain Casting Slip 0.99 Δ9 - 10 Oxidation
Reduction
Glossy 3.39 0.87 : 0.13 Clemson University---Ceramic Dept.
GVSU Snow White Deflocculated White Stoneware Casting Slip 2 Δ9 - 10 Oxidation
Reduction
5.28 0.89 : 0.11 Clemson University---Ceramic Dept.
Matte Turquoise -old (Cedar Hill) 4 Δ6 Oxidation
Matte Opaque 5.1 0.53 : 0.47 Sue McLeod
Woo Yellow -old (Cedar Hill) 4.76 Δ6 Oxidation
Matte Opaque 5.73 0.21 : 0.79 Sue McLeod
Anna's Green (Cedar Hill) 1 Δ6 Oxidation
Glossy Transparent 7.46 0.24 : 0.76 Sue McLeod
Orange Brown (Cedar Hill) 1.5 Δ6 Oxidation
Semi-matte Opaque 8.74 0.2 : 0.8 Sue McLeod
Eggplant (Cedar Hill) 1 Δ6 Oxidation
Matte Opaque 9.34 0.23 : 0.77 Sue McLeod
Floating Blue 2 Δ5 - 6 Oxidation
Semi-glossy Semi-opaque 7.01 0.47 : 0.53 mitch henke
Currie Blue 2 Δ5 - 7 Oxidation
Neutral
Satin-matte Opaque 4.94 0.47 : 0.53 Tamas Ferencz
Turquoise Matte 4 Δ4 - 7 Oxidation
Matte Opaque 5.19 0.53 : 0.47 Matt Garrett
Matt's Shino 2 Δ6 Oxidation
Semi-glossy Opaque 8.63 0.42 : 0.58 Matt Garrett
Licorice 2 Δ5 - 7 Oxidation
Glossy Opaque 9.61 0.21 : 0.79 Jeff Szarzi
Lapiz Blue 2 Δ9 - 10 Oxidation
Neutral
Reduction
Satin Semi-opaque 7.75 0.25 : 0.75 Sid Henderson
John's Red 2 Δ5 Reduction
Semi-glossy Semi-opaque 12.7 0.26 : 0.74 Clara Giorello
Antique White 2.2 Δ6 Oxidation
6.38 0.35 : 0.65 Jake Bish
Alternative strontium matte base 4 Δ5 - 11 Oxidation
Neutral
Reduction
Matte Semi-opaque 5.96 0.41 : 0.59 david tsabar
Fish Guts 2 Δ9 - 10 Reduction
Glossy Opaque 9.96 0.22 : 0.78 Sid Henderson
Charcoal Matte Black 2 Δ6 Oxidation
Satin-matte Opaque 4.79 0.26 : 0.74 Alisa Liskin Clausen
Shaner's Oribe 2 Δ9 - 10 Oxidation
Neutral
Reduction
Glossy Translucent 9.57 0.14 : 0.86 Sid Henderson
Malachite (Silverman) 2 Δ9 - 10 Oxidation
Neutral
Reduction
6.88 0.48 : 0.52 Sid Henderson
Tiger Eye Temmoku 2 Δ9 - 10 Reduction
Glossy Translucent 9.16 0.21 : 0.79 Sid Henderson
Chappell Floating Blue, Blue Hare (variation) 2 Δ5 - 6 Oxidation
Glossy 7.01 0.48 : 0.52 mitch henke
Folk Art Guild White (variation) 2 Δ5 - 6 Oxidation
Semi-glossy Opaque 6.42 0.27 : 0.73 Mary Higgins
Folk Art Guild White 2 Δ5 - 6 Oxidation
Semi-glossy Opaque 6.07 0.2 : 0.8 Mary Higgins
Glossy Dark Blue 2 Δ6 - 8 Oxidation
Glossy Transparent 7.05 0.25 : 0.75 kenneth ibbett
Pink Nickel 4.17 Δ6 Oxidation
Matte Opaque 8.59 0.21 : 0.79 Glazy Admin
Hirsch Satin Matte Yellow Cone--04 Glaze 2 Δ05 - 04 Oxidation
Satin-matte 24.24 0.33 : 0.67 Clemson University---Ceramic Dept.
Hirsch Satin Matte Rose Cone--04 Glaze 2 Δ05 - 04 Oxidation
Satin-matte 24.24 0.33 : 0.67 Clemson University---Ceramic Dept.
Hirsch Satin Matte Mint Cone--04 Glaze 2 Δ05 - 04 Oxidation
Satin-matte 24.24 0.33 : 0.67 Clemson University---Ceramic Dept.
Hirsch Satin Matte Purple Cone--04 Glaze 2 Δ05 - 04 Oxidation
Satin-matte 24.24 0.33 : 0.67 Clemson University---Ceramic Dept.
Val's Turquoise 3134 2 Δ5 - 6 Oxidation
Satin Opaque 14.97 0.3 : 0.7 Clara Giorello