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Silicates, borates and other salts

Bentonite

Also known as Wilkonite, Alum bentonite, Bentonite magma

CAS 1318-93-0Formula H2Al2O12Si4Molar mass 360.31 g/molEC 215-108-5
GHS signal word: Warning. Pictograms: Harmful or irritant 236 suppliers listed Drug substance
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Bentonite chemical structure, H2Al2O12Si4, CAS 1318-93-0
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
A clay containing appreciable amounts of the clay mineral montmorillonite, light yellow…
Melting point
>1200
Density
Relative density (water = 1): 2.5
Solubility
Insoluble in water and common organic solvents
HS code
250810
Category
Silicates, borates and other salts
Illustrative photo, off-white powder in an open kraft paper sack in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Bentonite?

Plain description, key identifiers and synonyms

Montmorillonite is a subclass of smectite and a natural aluminomagnesium silicate clay, with potential protective effect for the digestive tract mucosa, and anti-inflammatory and anti-diarrheal activities. Although the exact mechanism of action has yet to be fully elucidated, upon administration, montmorillonite may adsorb bacteria, bacterial enterotoxins, viruses and other potentially diarrheagenic substances. It may also bind to mucin and modify mucus properties, thereby enhancing the mucus barrier function.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dialuminum, tetrakis(dioxosilane), tris(oxygen(2-)), hydrate
CAS number
1318-93-0Other or deprecated CAS: 110070-78-5
EC numbers
215-108-5, 215-288-5
Molecular formula
H2Al2O12Si4
UNII
A3N5ZCN45C, A585MN1H2L
INCI name
BENTONITE, CI 77004, MONTMORILLONITE
InChIKey
GUJOJGAPFQRJSV-UHFFFAOYSA-N
InChI
InChI=1S/2Al.4O2Si.H2O.3O/c;;4*1-3-2;;;;/h;;;;;;1H2;;;/q2*+3;;;;;;3*-2
SMILES (canonical and isomeric)
O.[O-2].[O-2].[O-2].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.[Al+3].[Al+3]

Synonyms

  • Wilkonite
  • Alum bentonite
  • Bentonite magma
  • Colloidal clay
  • aluminum silicate hydrate
  • aluminium silicate hydrate
  • INS NO.558
  • Ci 77004
  • Bentonitum
  • GZE Indian Healing Clay
  • Accofloc 352
  • Accugel F
  • AEG 325
  • Akajo
  • Albagel Premium USP 4444
  • Altonit SF
  • Aquagel
  • Aquagel Gold Seal
  • Asama
  • Askangel
  • Benclay
  • Bengel
  • Bengel 11
  • Bengel 15
  • Bengel 23
Show all 39 synonyms
  • Bengel A
  • Bengel FW
  • Bengel HVP
  • BentoGrout
  • Bentolite HS
  • Bentolite L
  • Bentone 660
  • Bentonit T
  • Bentonite 2073
  • Bentosolon 82
  • Black Hills BH 200
  • Bulgarben BA
  • Clarit BW 100
  • Clarit BW 125

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
A clay containing appreciable amounts of the clay mineral montmorillonite, light yellow or green, cream, pink, gray toexp.
Odour
Odorlessexp.
Taste
Tastelessexp.
Melting point
>1200exp.
Density
Relative density (water = 1): 2.5exp.
Solubility
Insoluble in water and common organic solventsexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
360.31 g/molcalc.
Exact mass
359.8254 Dacalc.
LogP (octanol/water)
-4.42calc.
Topological polar surface area
253.6 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
8calc.
Rotatable bonds
0calc.
Heavy atoms
18calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
10calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Warning
GHS07: Harmful or irritant
Harmful or irritant

Hazard statements

  • H315Causes skin irritation.
  • H319Causes serious eye irritation.
  • H335May cause respiratory irritation.
Precautionary statements (16)
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P271Use only outdoors or in a well-ventilated area.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P302 + P352If on skin: Wash with plenty of water.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P332 + P317If skin irritation occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Bentonite suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 236 suppliers
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Where suppliers are based

236 suppliers in 33 countries

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Bentonite price

Indicative price range per kg from live supplier offers

No published prices right now

Suppliers quote this chemical on request. Send one free request and compare quotes side by side.

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Uses and applications

What the substance is used for, by industry and function

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

Granular carrier, powder suspension agent.

Drilling mud, foundry binders, iron ore pelletizing, cat litter, sealants, animal feed binders, paint, agricultural carriers, nanoclays, industrial oil absorbants, bleaching clays, catalysts, detergents, ceramics, cosmetics, dessicants, crayons, medical formulations, beer and wine clarification, suspension aids, de-inking on paper, tape joint compounds, emulsion stabilizers, slurry trench excavation, adhesives, pharmaceuticals, organoclays (Smectites).

Oil-well drilling fluids, cement slurries for oil-well casings, bonding agent in foundry sands and pelletizing of iron ores, sealant for canal walls, thickener in lubricating greases and fireproofing compositions, cosmetics, decolorizing agent, filler in ceramics, refractories, paper coatin

Read more

gs, asphalt modifier, polishes and abrasives, food additive, catalyst support.

Veterinary medication:.

Industrial uses: Filler, Thickening agent, Soil amendments (fertilizers), Viscosity modifiers, Flow promoter, Surface modifier, Anti-adhesive/cohesive, Binder.

Consumer uses: Processing aids not otherwise specified, Soil amendments (fertilizers), Thickening agent, Filler.

Use classes: Defoamers, Processing Aids and Additives, Safer Chemical Classes, Cosmetics.

Cosmetic ingredient, INCI name BENTONITE(absorbent, bulking, emulsion stabilising, viscosity controlling)

Pharmacological actions

  • Antidotes

Functional uses

  • Absorbent
  • Defoamer
  • Dispersing agent
  • Emulsifier
  • Filler
  • Opacifer
  • Processing aids not otherwise specified
  • Sealant (barrier)
  • Softener and conditioner
  • Stabilizing agent
  • Thickening agent
  • Viscosity modifier

Cosmetic functions

  • Abrasive
  • Absorbent
  • Bulking
  • Colorant
  • Emulsion stabilising
  • Light stabilizer
  • Viscosity controlling

How it is made

Bentonite beneficiation and processing involves relatively simple milling techniques that involve crushing or shredding, drying, and grinding and screening to suitable sizes.

Virtually all bentonite is strip-mined.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex IV, allowed colourant
    Name: CI 77004, Ref no: 119, Annex ref: IV/119
  • Active ingredient in FDA approved drug labels

United States

  • Safer Choice ingredient list (USA)

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Bentonite is traded under.

HS 2508.10Exact HS code

Clays (excluding expanded clays of heading 6806): bentonite, whether or not calcined

World exports in 2024
$865M
−8.2% vs 2023, imports $1.09B
2019 to 2024
Top exporters
  1. United States22.3%
  2. Turkey17.3%
  3. Netherlands10.3%
Top importers
  1. Germany10.1%
  2. Netherlands8.9%
  3. Canada6.7%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Bentonite is indicative (it was matched by name in the HS nomenclature). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Bentonite, based on the data on this page

What is Bentonite?

Montmorillonite is a subclass of smectite and a natural aluminomagnesium silicate clay, with potential protective effect for the digestive tract mucosa, and anti-inflammatory and anti-diarrheal activities.

What is the CAS number of Bentonite?

The CAS registry number of Bentonite is 1318-93-0. Other or deprecated CAS numbers: 110070-78-5.

What is the molecular formula and weight of Bentonite?

The molecular formula of Bentonite is H2Al2O12Si4 and its molar mass is 360.31 g/mol.

What is Bentonite used for?

As of Fuller's earth, as emulsifier for oils, as a base for plasters. Pharmaceutical aid (suspending agent). Granular carrier, powder suspension agent.

Is Bentonite hazardous?

Bentonite carries the GHS signal word "Warning". Main hazards: causes skin irritation, causes serious eye irritation, may cause respiratory irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Bentonite?

Bentonite is usually classified under HS code 250810 (Bentonite). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Bentonite?

CompoundList lists 236 suppliers of Bentonite in India, United States, China, United Arab Emirates and 29 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Bentonite in India?

88 suppliers in India list Bentonite on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Bentonite?

Suppliers quote Bentonite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Bentonite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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