Bentonite Chemical Properties
- Practically insoluble in water and in aqueous solutions. It swells with a little water forming a malleable mass.
- Light yellow or green, cream,pink, gray to black solid
- Water Solubility
- Insoluble in water and forms a colloidal solution.
- CAS DataBase Reference
- EPA Substance Registry System
- Bentonite (1302-78-9)
Bentonite Usage And Synthesis
gel, or solid if dry
Bentonite is a light yellow, creamy, pale brown or gray to black powder or granules.
Bentonite is a crystalline, claylike mineral, and is available as an odorless, pale buff, or cream to grayish-colored fine powder, which is free from grit. It consists of particles about 50–150 mm in size along with numerous particles about 1–2μm. Microscopic examination of samples stained with alcoholic methylene blue solution reveals strongly stained blue particles. Bentonite may have a slight earthy taste.
Bentonite is a general purpose additive that is used as a pigment and colorant and to clarify and stabilize wine.
filler in cosmetics and other products, gel, or solid if dry
As of Fuller's earth; as emulsifier for oils; as a base for plasters. Pharmaceutic aid (suspending agent).
bentonite (bentonite clay) is used to regulate the viscosity and suspension properties of a cosmetic formulation. It also acts as an overall formula stabilizer. Bentonite’s water-absorption capabilities allow it to form a gelatinous mass. Considered a noncomedogenic raw material, bentonite is a colloidal aluminum silicate clay.
Bentonite is a native, colloidal, hydrated aluminum silicate, found in regions of Canada and the USA. The mined ore is processed to remove grit and nonswelling materials so that it is suitable for pharmaceutical applications.
A type of clay that is used as an adsorbent in making paper. The gelatinous suspension it forms with water is used to bind together the sand for making iron castings. Chemically bentonite is an aluminosilicate of variable composition.
Bentonite is a naturally occurring hydrated aluminum silicate used
primarily in the formulation of suspensions, gels, and sols, for
topical pharmaceutical applications. It is also used to suspend
powders in aqueous preparations and to prepare cream bases
containing oil-in-water emulsifying agents.
Bentonite may also be used in oral pharmaceutical preparations, cosmetics, and food products. In oral preparations, bentonite, and other similar silicate clays, can be used to adsorb cationic drugs and so retard their release. Adsorbents are also used to mask the taste of certain drugs.
Bentonite has been investigated as a diagnostic agent for magnetic resonance imaging.
Therapeutically, bentonite has been investigated as an adsorbent for lithium poisoning.
Bentonite, also known as montmorillonite, volcanic
clay, soap clay and amargosite, is a soft, plastic, lightcolored,
porous rock consisting largely of colloidal
silica. Composed essentially of clay minerals, it swells
extensively when wet. Bentonite belongs chiefly to the
montmorillonite group and has two varieties: (a) sodium
bentonite, with a high swelling capacity in water, and
(b) calcium bentonite, with negligible swelling capacity.
Bentonite is used variously as a suspending aid, a gelatinous slurry to extinguish fire, a paint thickener, and as a sealant for earthen pots. Bentonite is also widely used in metallurgy, soap manufacture, and in petroleum refining because of its high decolorizing power and strong adsorbing capacity.
Clays exist in many forms, of which montmorillonite is
one form. Kaolinite and montmorillonite, which are clay
minerals, have different layer structures with differing
abilities to absorb and retain water, and to adsorb and
Montmorillonites have an expanding structure (2: 1) and have high cation exchange capacity (80 to 120 mg per 100 g). They have abundant black clay soils. Other minerals in this group are biedellite and nontronite.
Poison by intravenous route causing blood clotting. Questionable carcinogen with experimental tumorigenic data.
Bentonite is mainly used in topical pharmaceutical formulations but
has also been used in oral pharmaceutical preparations, food
products, and cosmetics.
Following oral administration, bentonite is not absorbed from the gastrointestinal tract. Bentonite is generally regarded as a nontoxic and nonirritant material.
LD50 (rat, IV): 0.035 g/kg
This material is used as Fuller’s earth; as a mineral, natural, or synthetic fiber; as an emulsifier for oils; as a base for plasters; in cosmetics, in polishes and abrasives; as a food additive and others. Bentonites are aluminate silicate and can contain crystalline silica. The content varies widely from less than 1% to about 24% .
Bentonite is hygroscopic, and sorption of atmospheric water should
Aqueous bentonite suspensions may be sterilized by autoclaving. The solid material may be sterilized by maintaining it at 1708℃ for 1 hour after drying at 1008℃.
Bentonite should be stored in an airtight container in a cool, dry place.
Bentonite is not cited in the DOT Performance- Oriented Packaging Standards.
Substance is a weak acid in water; avoid contact with strong alkaline material. Incompatible with oxidizers (chlorates, nitrates, peroxides, permanganates, perchlorates, chlorine, bromine, fluorine, etc.); contact may cause fires or explosions. Keep away from alkaline materials, strong bases, strong acids, oxoacids, epoxides.
Aqueous bentonite suspensions retain their viscosity above pH 6,
but are precipitated by acids. Acid-washed bentonite does not have
suspending properties. The addition of alkaline materials, such as
magnesium oxide, increases gel formation.
Addition of significant amounts of alcohol to aqueous preparations will precipitate bentonite, primarily by dehydration of the lattice structure.
Bentonite particles are negatively charged and flocculation occurs when electrolytes or positively charged suspensions are added. Bentonite is thus said to be incompatible with strong electrolytes, although this effect is sometimes used beneficially to clarify turbid liquids.
The antimicrobial efficacy of cationic preservatives may be reduced in aqueous bentonite suspensions, but nonionic and anionic preservatives are unaffected.
Bentonite is incompatible with acriflavine hydrochloride.
Land fill disposal.
Accepted in Europe as a food additive in certain applications. Included in the FDA Inactive Ingredients Database (oral capsules, tablets and suspensions, topical suspensions, controlled release transdermal films and vaginal suppositories). Included in nonparenteral medicines licensed in the UK. Included in the Canadian List of Acceptable Non-medicinal Ingredients.
Bentonite Preparation Products And Raw materials
- Sodium bentonite
- Tosylmethyl isocyanide
- COBALT(II) ACETYLACETONATE
- Cupric acetylacetonate
- TERT-BUTYL ISOCYANIDE
- COBALT ETHYLENE DIAMINE CHLORIDE
- BENZYL ISOCYANIDE
- Aluminum acetylacetonate
- Ethyl isocyanoacetate
- Ferric acetylacetonate
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