Our customers use Bentonite in a wide range of applications. Within the foundry industry, companies use Bentonite as a binder as the mineral can withstand high temperatures.

Your contact for:
Glyn Thomas

Glyn Thomas

Sales Manager, Bentonite

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Depending your casting method, we offer a range of Bentonite products.

Ceramics and paper industry

Both the ceramics industry and paper industry use white Bentonite.

In the ceramics production our customers use this to improve the green strength and the ceramic body properties.
While for papermaking, the product provides pitch control and improves the paper quality.

Bentonite based grouting materials

For your convenience, we designed our high-efficiency Bentonite based grouting materials specifically for geothermal wells. Supplying our product this way ensures easy:

  • pumping
  • mixing
  • and placing

Also, our product proves to have a long working life.

Bentonite granules for the foundry industry

Bentonite is a versatile clay composed of the mineral montmorillonite which is part of the smectite group of clays.

Bentonite standard product range

Activated Calcium Bentonite:

  • F2 Granules
  • F2
  • FD
  • FD_G
  • FD_GSC
  • FD_SC

Calcium Bentonite:

  • MB300
  • MSB

Sodium Bentonite grades:

  • MPV

Bentonite Packaging

We can deliver the product in 25 kg paper sacks, 1,000 kg bulk bags or as bulk.

Chemical and physical properties

LKAB Minerals offer a range of products with a varying Montmorillonite content dependent upon the end-use. You will find more information on the chemistry and physical properties on our product definition which you can request with your local sales manager.

Mineral origin

Bentonite is derived from volcanic ash and consists predominately of smectite minerals usually Montmorillonite. We categorise this product as a sedimentary deposit containing >50% Montmorillonite which is volcanic in origin. Montmorillonite is a dioctahedral layer silicate and in sodium form swells when mixed with water to form dispersed colloid-size particles.
There are two common types of Bentonite for commercial use; sodium (or swelling) Bentonite and calcium Bentonite.


Bentonite is non-toxic and inert. LKAB Minerals do not offer this product for consumption in any form.

Common questions and answers

  • What is the Free Moisture Content of Bentonite?


    Our materials are rich in Montmorillonite, being consistently more than 85% in most grades.

  • What is the Swelling Index of the Bentonite?


    Our Sodium Bentonite products swell in the range of 25ml – 30ml. This swelling is based upon 2grms of Bentonite in 100mls of water.

  • What is the Particle Sizing of the Bentonite powdered material available?


    We process our powders in the particle size range 85% passing 75 microns to 99% passing 53 microns on a dry powder basis.

  • What is the Free Moisture Content of Bentonite?


    Our products range from 8% to 14% depending upon our customer’s specific requirements.

  • What is the Thermal Stability of the Foundry grade Bentonite?


    Our Foundry grade products demonstrate excellent levels of thermal stability, and we source this from internationally recognised deposits.

  • What are the Wet Tensile Strength properties of the Foundry grade Bentonite?


    According to VDG testing our Foundry grades achieve 0.28 N/Cm2 minimum.

  • What are the Green Compression Strength properties of the Foundry grade Bentonite?


    According to VDG testing our Foundry grades achieve 7.0 N/Cm2 minimum.

  • Do LKAB Minerals supply Activated and Naturally occurring Bentonite grades?


    LKAB Minerals supplies naturally occurring Na material sourced from Wyoming – USA.

  • Do LKAB Minerals supply White Bentonite?


    Yes, we supply from internationally recognised deposits.

  • What Bentonite packaging options do LKAB Minerals support?


    We can supply our products in packaging ranging from 25kgs sacks through to full bulk tankers.

  • What is the price for Bentonite?


    Your price will depend on your location, the volume you purchase and some other factors. Please contact your local sales manager to discuss your needs and get a quotation.