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Vermiculite, expanded vermiculite

Vermi Vermiculite, expanded vermiculite

Vermiculite  – is a natural mineral of layered hydromicas with typical glass glitter. Lamellar crystals of vermiculite usually have yellow or golden-brown color. Natural vermiculite has a rather complicated general chemical formula (Mg+2, Fe+2, Fe+3)3 [(AlSi)4O10]•(OH)2•4H2O and, as a rule, contains in its structure a number of impurities. From the physical characteristics should be noted the density of 2,4-2,7 g/cm3 and a melting point – 1350 ° C.

When heated to a temperature of 400-1000 ° C natural vermiculite increases in volume by 15-25 times and turns in the expanded vermiculite, which is widely used in various sectors of industrial activity.

Expanded vermiculite is a layered scales (from 0.5 to 2 mm) gold or silver and has the following outstanding features:

  • lack of odor and durability;
  • considerable ease (0,065-0,130 g/cm3), porosity, and flowability;
  • heat resistance (temperature range from minus 260 ° C to + 1200 ° C);
  • Biological and chemical resistance;
  • environmental safety;
  • low hygroscopicity and high water absorption;
  • high thermal and sound insulating properties.

Thanks to the above-mentioned qualities, expanded vermiculite is widely used in construction, nuclear, food and chemical industries, agriculture, metallurgy, shipbuilding, etc.

Plates vermiculite fireproof insulation PVTN TU 5767-002-43545684-01 for thermal protection and structural fire protection of walls, floors, chimney when installing fireplaces, stoves and other energy equipment:

  • compressive strength of plates, not less than 1.2 MPa
  • bending strength of the plate, not less than 1.0 MPa
  • thermal conductivity at a temperature of 25 ± 5 ° C, not more than 0.13 W / m deg.
  • temperature of 1000 degrees.
  • PVTN plate can be easily cut, drilled, fastened screws, which is very important for the easy creation of designs.

More detailed properties and the scope of the expanded vermiculite presented in the following sections of our site.

What is vermiculite?

Vermiculite (от лат. vermiculus — worm), mineral from the group hydromicas having a layered structure. It is a large plate-like crystals of golden-yellow or brown color. Upon heating of the plates are formed worm-like threads of gold bars or silver, or with a transverse division in the finest scales - (EXPANDED VERMICULITE)

That he has been widely used in many spheres of our life.