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Silicates, borates and other salts

Kaolin

Also known as Kaolin, light, Weisserton, Chishizhi

CAS 12068-50-7Formula H4Al2O9Si2Molar mass 258.16 g/molEC 310-194-1
152 suppliers listed Drug substance
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Kaolin chemical structure, H4Al2O9Si2, CAS 12068-50-7
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
White or yellowish-white, earhty mass or white powder, unctuous when moist
Density
2.65 g/cm³
Solubility
Insoluble in water
HS code
250700
Category
Silicates, borates and other salts
Illustrative photo, a white jumbo bulk bag of powder in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Kaolin?

Plain description, key identifiers and synonyms

Kaolin appears as odorless white to yellowish or grayish powder. Contains mainly the clay mineral kaolinite (Al2O3(SiO2)2(H2O)2), a hydrous aluminosilicate. Kaolinite has mp 740-1785 °C and density 2.65 g/cm3. Kaoline is insoluble in water but darkens and develops a earthy odor when wet.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
dialuminum, trioxido(trioxidosilyloxy)silane, dihydrate
CAS number
12068-50-7Other or deprecated CAS: 95077-05-7
EC numbers
310-194-1, 619-103-2
Molecular formula
H4Al2O9Si2
UNII
24H4NWX5CO
INCI name
HALLOYSITE, KAOLIN
InChIKey
KGOIAFZMMLWXLM-UHFFFAOYSA-N
InChI
InChI=1S/2Al.O7Si2.2H2O/c;;1-8(2,3)7-9(4,5)6;;/h;;;2*1H2/q2*+3;-6;;
SMILES (canonical and isomeric)
O.O.[O-][Si]([O-])([O-])O[Si]([O-])([O-])[O-].[Al+3].[Al+3]

Synonyms

  • Kaolin, light
  • Weisserton
  • Chishizhi
  • Natural kaolin
  • Red halloysite
  • Heavy kaolin
  • Kaolin light
  • Alumina silicata
  • Halloysitum rubrum
  • Hydrated aluminium silicate
  • Refractoriness
  • Porcelan Clay
  • Diarrhea Control
  • Kaolin,
  • PET Pectillin
  • pectin and kaolin
  • Optiwhite
  • Icecap k
  • Diarrhea Control Liquid
  • Anti diarrhea cat
  • Stop the diarrhea
  • Skpradis Dead Sea Mud Mask
  • Dog mx anti-diarrheal
  • Petceuticals anti diarrhea
  • ASP 600
Show all 39 synonyms
  • MySimplePetLab Loose Stool Relief
  • Under the weather anti diarrhea
  • Dr Pore Tightening PINK CLAY FACIAL MASK
  • QYO QYO Tangerine Bright Moist Peeling Pack
  • Dr Pore Tightening GLACIAL CLAY FACIAL MASK
  • Derladie Vegan Pink Clay Mask Deep Pore Tightening
  • Mefactory pig collagen 1step piggy nose pack
  • Sonatural the pure pore tensing carbonic bubble pop clay mask
  • AA Kaolin
  • Acidic white clays
  • Airflo V 8
  • Alfaplate
  • Alphacoat
  • Alphagloss

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
White or yellowish-white, earhty mass or white powder, unctuous when moistexp.
Odour
When moistened develops a clay-like odorexp.
Taste
Earth tasteexp.
Density
2.65 g/cm³exp.
Solubility
Insoluble in waterexp.
Vapour pressure
0 mmHg (approx)exp.

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
258.16 g/molcalc.
Exact mass
257.9025 Dacalc.
LogP (octanol/water)
-10.38calc.
Topological polar surface area
210.6 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
7calc.
Rotatable bonds
2calc.
Heavy atoms
13calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
5calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS classification
Hazard pictograms

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

Kaolin suppliers

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

All 152 suppliers
30 of 30 offers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

152 suppliers in 38 countries

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Kaolin 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

The major domestic markets for kaolin were, in descending order of tonnage, paper coating and filler, refractory products, fiberglass and mineral wool. paint, catalyst manufacture, rubber, and heavy-clay products. Other markets were ceramics, chemical manufacture and plastics. ...

Anticaking preparations, ... insecticides, ... electrical insulators.

Used in formulating dust concentrates and wettable powders.

Industrial uses: Processing aids not otherwise specified, Abrasives, Anti-caking agent, Binder, Other, Pigment, Intermediate, Dye.

Consumer uses: Pigment, Dye, Impregnation agent, Soil amendments (fertilizers), Catalyst, Filler, Thickening agent.

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

Cosmetic ingredient, INCI name KAOLIN(abrasive, absorbent, anticaking, bulking)

Pharmacological actions

  • Antidiarrheals

Roles

  • additive
  • antidiarrhoeal drug
  • excipient
  • filler
  • gastrointestinal drug
  • pharmaceutical

Functional uses

  • Abrasive
  • Absorbent
  • Anti-caking agent
  • Binder
  • Filler
  • Opacifer
  • Pigment
  • Processing aids not otherwise specified
  • Sealant (barrier)
  • Surface modifier
  • Thickening agent
  • Viscosity modifier

Cosmetic functions

  • Abrasive
  • Absorbent
  • Anti-sebum
  • Anticaking
  • Bulking
  • Colorant
  • Opacifying
  • Viscosity controlling

How it is made

Kaolin is a hydrated aluminum silicate obtained by mining naturally occurring mineral deposits. Large deposits are found in Georgia, USA and in Cornwall, England. Mined kaolin is powdered and freed of coarse, gritty particles either by elutriation or by screening. Impurities such as ferric oxide, calcium carbonate, and magnesium carbonate are removed with a electromagnet and by treatment with hydrochloric acid and/or sulfuric acids.

Prepared for pharmaceutical and medicinal purposes by levigating with water to remove sand, etc

Naturally occurring deposits of kaolin are processed (purified) by

Read more

one of two basic processes, a dry process or a wet process ... the dry process involves crushing, drying, pulverizing and classifying ... the wet processes involve formation of a kaolin slurry followed by various separation techniques (selective flocculation, magnetic separation, delamination, flotation), dewatering and drying.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • 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 Kaolin is traded under.

HS 2507.00Exact HS code

Kaolin and other kaolinic clays whether or not calcined

World exports in 2024
$1.72B
+7.4% vs 2023, imports $1.83B
2019 to 2024
Top exporters
  1. United States34.4%
  2. United Kingdom13.6%
  3. China9.3%
Top importers
  1. China8.5%
  2. Italy6.3%
  3. Germany6.1%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Kaolin 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 Kaolin, based on the data on this page

What is Kaolin?

Kaolin appears as odorless white to yellowish or grayish powder. Contains mainly the clay mineral kaolinite (Al2O3(SiO2)2(H2O)2), a hydrous aluminosilicate. Kaolinite has mp 740-1785 °C and density 2.65 g/cm3. Kaoline is insoluble in water but darkens and develops a earthy odor when wet.

What is the CAS number of Kaolin?

The CAS registry number of Kaolin is 12068-50-7. Other or deprecated CAS numbers: 95077-05-7.

What is the molecular formula and weight of Kaolin?

The molecular formula of Kaolin is H4Al2O9Si2 and its molar mass is 258.16 g/mol.

What is Kaolin used for?

The major domestic markets for kaolin were, in descending order of tonnage, paper coating and filler, refractory products, fiberglass and mineral wool. paint, catalyst manufacture, rubber, and heavy-clay products. Other markets were ceramics, chemical manufacture and plastics. ... Anticaking preparations, ...

Is Kaolin hazardous?

No GHS hazard classification for Kaolin is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Kaolin?

Kaolin is usually classified under HS code 250700 (Kaolin and other kaolinic clays, whether or not calcined). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Kaolin?

CompoundList lists 152 suppliers of Kaolin in India, China, United States, Germany and 34 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Kaolin in India?

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

What is the price of Kaolin?

Suppliers quote Kaolin 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 Kaolin

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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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