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Sodium montmorillonite, calcium montmorillonite, saponite, montmorillonite (Na), montmorillonite (Ca), bentonite, taylorite, fuller's earth, wyoming sodium bentonite, hectorite, hormite clay bentonite magma, southern bentonite, tixoton, volclay, volclay bentonite BC, wilkinite
Chemical Formula: Al2O34SiO2H2O
Chemical Name: Naturally occurring hydrated aluminum silicate
a) A rock composed essentially of a crystalline clay-like mineral formed by devitrification and the accompanying chemical alteration of a glassy igneous material, usually a tuff or volcanic ash.
b) Smectite refers to a family of non-metallic clays primarily composed of hydrated sodium calcium aluminum silicate. Common names for smectite include montmorillonite or sodium montmorillonite ("sodium bentonite" or "Wyoming bentonite") and swelling bentonite ("Western bentonite").
c) There are three types of bentonite:
- Natural Calcium Bentonite or Calcium Montmorillonite
- Natural Sodium Bentonite or Sodium Montmorillonite
- Sodium Activated Bentonites or Sodium Activated Montmorillonites
d) Bentonite minerals occur as lenses or seams containing up to 50% moisture. They are rocklike in nature and usually extracted by opencast mining (quarrying).
e) Natural sodium bentonite as the name suggests occurs with sodium as the predominant exchange cation. The name originates from its discovery near Fort Benton, USA. Sodium bentonites are characterized by high swelling, high liquid limit and high thermal durability.
f) The vast majority of the montmorillonites occurring in abundance world wide are of the calcium type and referred to as calcium bentonites. The name montmorillonite originates from a discovery made at Montmorillon in France. Calcium bentonites are often characterized by much lower swelling and liquid limit values compared to natural sodium bentonite.
g) Sodium activated bentonites are produced by the substitution of calcium ions by sodium ions. This transformation can be achieved by the addition of a soluble sodium salt to calcium bentonite. Source
a) Commercial Grade: SiO2= 61.3 and Al2O3= 19.8
b) Food Grade: Si02 = 58-61, Ca0= 2.0-2.5, Al203=21-22, Mg0= 3-4, Na20= 3.7-4.2, As= 5 ppm max., and Pb= 40 ppm max.
Numerous particle size options are available in the lower micron area from a mean particle size of 2.5 to 4.0 microns.
|Uncompacted Density (lbs./cu.ft.)||47.5|
|Compacted Bulk Density (lbs./ft3)||37 to 56|
|Boiling Point (°C)|
|Surface Area (m2/cc)||0.09 to 1.8|
|Thermal Conductivity (cal/s-cm-°C)|
|Mohs Hardness @20°C|
|pH||8.5 to 10.5|
|Nominal Color||light cream|
a) Used as a foundry sand, paints, fuller's earth, drilling mud, bleaching clay, filtering agents, water impedance, inks, additive to ceramic materials, and iron ore pelletizing
b) Pharmaceuticals, beverage, food, cosmetics, and personal care products (Suspending agent, gellant and binder)
c) Bentonite possesses thixotropic properties and deposits a thin water proofing film on the walls of the bore holes & thus renders permeable formations impermeable.
d) Both natural & synthetic Bentonite are used in preparation of drilling muds. It is mainly used as circulation mud in rotary system of drilling for oil. The main purpose of Bentonite is to lubricate & cool the rotary cutting bits, carry away rock cutting fragments & to act as a seal against the escape of gas from the bore hole & to improve & prevent the hole from blowing out. Another function of such Bentonite based fluids is to condition the wall of the drill hole to prevent caving.
Jars, pails, drums, multiply paper bags, bulk bags and fiberboard containers
Unknown. For further information please call the E.P.A. at 1.202.554.1404
East Coast USA: 1-401-433-7000 / West Coast USA: 1-775-352-1000 / Latin America: 507-314-1282
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sodium montmorillonite, calcium montmorillonite, saponite, montmorillonite (Na), montmorillonite (Ca), bentonite, taylorite, fuller's earth, wyoming sodium bentonite, hectorite, hormite clay