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Bentonite Basic information
  • Product Name:Bentonite
  • CAS:1302-78-9
  • MF:Al2O3.4(SiO2).H2O
  • MW:360.31
  • EINECS:215-108-5
  • Mol File:Mol File
Bentonite Chemical Properties
  • Density 2~3g/cm3
  • solubility Practically insoluble in water and in aqueous solutions. It swells with a little water forming a malleable mass.
  • form powder
  • color Light yellow or green, cream,pink, gray to black solid
  • Water Solubility Insoluble in water and forms a colloidal solution.
  • Merck 14,1055
  • Stability:Stable.
  • CAS DataBase Reference1302-78-9
  • EPA Substance Registry SystemBentonite (1302-78-9)
Safety Information
Bentonite Usage And Synthesis
  • Chemical Propertiesgel, or solid if dry
  • Chemical PropertiesBentonite is a light yellow, creamy, pale brown or gray to black powder or granules.
  • Chemical PropertiesBentonite 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.
  • UsesBentonite is a general purpose additive that is used as a pigment and colorant and to clarify and stabilize wine.
  • Usesfiller in cosmetics and other products, gel, or solid if dry
  • UsesAs of Fuller's earth; as emulsifier for oils; as a base for plasters. Pharmaceutic aid (suspending agent).
  • Usesbentonite (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.
  • Production MethodsBentonite 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.
  • DefinitionA 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.
  • Pharmaceutical ApplicationsBentonite 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.
  • Agricultural UsesBentonite, 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.
  • Agricultural UsesClays 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 exchange cations.
    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.
  • Safety ProfilePoison by intravenous route causing blood clotting. Questionable carcinogen with experimental tumorigenic data.
  • SafetyBentonite 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
  • Potential ExposureThis 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% .
  • storageBentonite is hygroscopic, and sorption of atmospheric water should be avoided.
    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.
  • ShippingBentonite is not cited in the DOT Performance- Oriented Packaging Standards.
  • IncompatibilitiesSubstance 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.
  • IncompatibilitiesAqueous 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.
  • Waste DisposalLand fill disposal.
  • Regulatory StatusAccepted 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
Bentonite(1302-78-9)Related Product Information
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