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            ChemicalBook >> CAS DataBase List >>Bentonite


            CAS No.
            Chemical Name:
            MONTMORILLONITE;CI 77004;volclay;FULLERS EARTH;BENTONITE MAGMA;MONTMORILLONITECLAY;hi-jel;magbond;tixoton;otaylite
            Molecular Formula:
            Molecular Weight:
            MOL File:
            Mol file

            Bentonite 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 Reference 1302-78-9
            FDA 21 CFR 184.1155; 582.1155; 175.105; 176.170; 178.3297
            Substances Added to Food (formerly EAFUS) BENTONITE
            SCOGS (Select Committee on GRAS Substances) Bentonite
            EWG's Food Scores 1-2
            FDA UNII A3N5ZCN45C
            NCI Drug Dictionary montmorillonite
            EPA Substance Registry System Bentonite (1302-78-9)


            Risk and Safety Statements

            Risk Statements  20/22-8
            Safety Statements  22-24/25
            WGK Germany  3
            RTECS  CT9450000
            TSCA  Yes
            Toxicity LD50 intravenous in rat: 35mg/kg

            Bentonite price More Price(7)

            Manufacturer Product number Product description CAS number Packaging Price Updated Buy
            Sigma-Aldrich 285234 Bentonite 1302-78-9 500g $45.1 2022-05-15 Buy
            Sigma-Aldrich 285234 Bentonite 1302-78-9 2.5kg $169 2022-05-15 Buy
            Alfa Aesar A15795 Bentonite, sodium form 1302-78-9 500g $23.7 2021-12-16 Buy
            Alfa Aesar A15795 Bentonite, sodium form 1302-78-9 2500g $84.6 2021-12-16 Buy
            Sigma-Aldrich 682659 Nanoclay, hydrophilic bentonite 1302-78-9 500g $77.9 2022-05-15 Buy
            Product number Packaging Price Buy
            285234 500g $45.1 Buy
            285234 2.5kg $169 Buy
            A15795 500g $23.7 Buy
            A15795 2500g $84.6 Buy
            682659 500g $77.9 Buy

            Bentonite Chemical Properties,Uses,Production

            Chemical Properties

            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.

            Chemical Properties

            Bentonite is a light yellow, creamy, pale brown or gray to black powder or granules.


            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.


            As of Fuller's earth; as emulsifier for oils; as a base for plasters. Pharmaceutic aid (suspending agent).


            filler in cosmetics and other products, gel, or solid if dry


            Bentonite is a general purpose additive that is used as a pigment and colorant and to clarify and stabilize wine.


            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.

            Production Methods

            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.

            General Description

            Bentonite is comprised primarily of the smectite group (montmorillonite) of clay minerals. It is widely used in various industrial applications such as clarification of edible and mineral oils, paints, cosmetics, and pharmaceuticals. It is also used as an adsorbent for the elimination of pollutants from wastewater.
            The swelling property of bentonite is used to produce viscous water suspensions for bonding, plasticizing, and suspending applications. The presence of a large surface area of bentonite is due to the colloidal dispersion of the particles is the main reason for its application as an insecticide carrier, an emulsifier, and an emulsion stabilizer.

            Agricultural Uses

            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 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.

            Pharmaceutical Applications

            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.

            Agricultural Uses

            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.

            Safety Profile

            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

            Potential Exposure

            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 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.


            Bentonite is not cited in the DOT Performance- Oriented Packaging Standards.


            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.


            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.

            Waste Disposal

            Land fill disposal.

            Regulatory Status

            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.

            Global( 242)Suppliers
            Supplier Tel Email Country ProdList Advantage
            Henan Tianfu Chemical Co.,Ltd.
            0371-55170693 info@tianfuchem.com China 22021 55
            Hebei Guanlang Biotechnology Co., Ltd.
            +86-19930503282 +86-19930503282 alice@crovellbio.com China 5953 58
            Hubei xin bonus chemical co. LTD
            86-13657291602 linda@hubeijusheng.com CHINA 23035 58
            Shandong chuangyingchemical Co., Ltd.
            18853181302 sale@chuangyingchem.com CHINA 5917 58
            Shanghai Longyu Biotechnology Co., Ltd.
            +8615821988213 info@longyupharma.com China 2522 58
            +8618523575427 sales@conier.com China 47501 58
            career henan chemical co
            +86-0371-86658258 factory@coreychem.com China 29862 58
            Hefei TNJ Chemical Industry Co.,Ltd.
            0551-65418671 sales@tnjchem.com CHINA 34618 58
            Hebei Zhanyao Biotechnology Co. Ltd
            +8615369953316 admin@zhanyaobio.com China 2152 58
            Shaanxi Dideu Medichem Co. Ltd
            29-89586680 +8618192503167 1005@dideu.com China 9938 58

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            View Lastest Price from Bentonite manufacturers

            Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
            2022-04-22 Bentonite for drilling
            US $5.00 / KG 100KG 99% 1000kg Hebei Yime New Material Technology Co., Ltd.
            2022-03-17 Bentonite
            US $5.00 / KG 100KG 99% 1000kg Hebei Yime New Material Technology Co., Ltd.
            2022-01-13 Bentonite
            US $19.00 / KG 1KG 99.% 50 ton Hebei Crovell Biotech Co Ltd
            • Bentonite
            • US $5.00 / KG
            • 99%
            • Hebei Yime New Material Technology Co., Ltd.
            • Bentonite
            • US $19.00 / KG
            • 99.%
            • Hebei Crovell Biotech Co Ltd
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