VermiculiteVermiculite is a hydrous phyllosilicate mineral obtained by heating mica-type minerals such as biotite or phlogopite. As it is heated, it expands significantly while undergoing exfoliation process at the same time. The result is a highly sorbent material with harmonica-like structure, high cation exchange capacity and pH of 9-10. All of these properties find a lot of commercial uses.




  • Molded shapes – to be used in fireplaces, masonry, acoustic panels;
  • Calcium silicate boards;
  • Insulating concretes;
  • Brake linings;
  • Soilless growing media;
  • Seed germination;
  • Soil conditioner;
  • Insulation materials;
  • Packing materials;
  • Farming (incubation of eggs);
  • Slow cooling of hot materials (steel, glass, etc);
  • Cultivation of fungi.


Typical analysis:


Silicon (SiO2) – 37-40%
Magnesium (MgO) – 21-29%
Aluminium (Al2O3) – 6-10%
Iron (Fe2O3) – 4-8%
Potassium (K2O) – 3-6%
Calcium (CaO) – 1-4%
Carbon (CO2) – 1-2%
Moisture – none (when packed)
pH – 7-10


The predominant exchangeable cation is magnesium, and the Cation Exchange Capacity (“CEC”) of Exfoliated Vermiculite is 90-100 meq/100g.


Physical Properties


The bulk density of Exfoliated Vermiculite varies from 60 to 100Kg/m3 depending on the grade (finer grades have a higher bulk density) and the degree of settling.


Particle sizes available


The following particle sizes are available:  0.1-1mm, 0.5-2mm, 1-3mm and 2-5mm.


Vermiculite is available in 100 litre sacks and 1250 litre big bags.


For further information please contact us.