Cookies: we set a single session cookie so that we can maintain the status of your basket and other choices. This cookie is necessary for the website to operate and contains only the ID; if you continue to use the website we will assume that you are happy to accept this cookie.

Advanced ..




Sodium bentonite is a truly outstanding clay, with a very small particle size which not only gives it a lovely velvety texture, but also provides it with extra-high swelling capacity. The high pH level at 9-10 ensures high alkalinity of the clay.

Sodium bentonite is widely used for purification of wines and juices due to its high cation exchange capacity and ability to bind proteins.

Sodium Bentonite belongs to the smectite group of clays. It is a phylosilicate consisiting mainly of montmorillonite. Bentonite clay owes its name to Fort Benton, Wyoming, USA, where it was originally found. This is where the sodium bentonite we sell comes from too.

Price: £105.00 Qty:

There are a few types of bentonite/montmorillonite clays - depending on the main exchangeable ion which can be calcium, sodium, magnesium or potassium. We will talk about 2 main ones - calcium and sodium bentonite. "One is called sodium bentonite, or swelling clay. It is very fine and takes much longer time to mix with water. It is soapy to touch, because of the sodium ions which creates highly alcaline environment when mixed with water. which has single water layer particles containing Na+ as the exchangeable ion. The other has double water layer particles with Ca++ as the exchangeable ion. It is called calcium bentonite or non-swelling type. Na+ or Ca++ is exchanged by Mg++ or Fe++. A third type of montmorillonite has been identified with zero water layer particles and is probably electrostatically neutral."


A natural hydrated aluminosilicate mineral with typical empirical formula: (Al, Fe0.67 Mg0.33) Si4O10(OH)2Na,Ca0.33
Origin- Wyoming/USA
Extraction- 100% naturally occurring and naturally quarry mined
Shelf life- indefinite
Color- light grey
Odor- odourless
Mesh Size- < 200
Particle size: Retained on 75 um 15% maximum (mesh size <200)
pH: 9-10
Cation exchange capacity - 70-100meq/100g
Typical mineralogical composition: Bentonite (montmorillonite); up to 3% crystalline silica

Typical Chemical Analysis:

SiO2 - 61.21%, Al2O3 - 19.77%, Fe2O3 - 4.24%, MgO - 2.37%, Na2O - 2.24%, CaO - 1.50%, K2O - 0.59%, TiO2 - 0.15%, P2O5 - 0.06%, Mn2O3 - <0.05%, V2O5 - <0.05%, Cr2O3 - <0.05%, BaO - <0.05%, ZrO2 - <0.05%, ZnO - <0.05%, SrO - <0.05%,