About Vermiculite

1.What is vermiculite and how it is made?


options units description
density kg/m³ 65 – 150
thermal conductivity Wt/M*К 0,048 – 0,06
melting point °C + 1350
toxicity  – non toxic
color Silver, grey,bown
temperature °C -260 bis +1250
sound absorption coefficient (1000Hz)  – 0,2 – 0,8



Exfoliated vermiculite and materials based on it are very effective for heat and fire insulation of industrial equipment. This area of application is determined by high porosity, large reflectivity, low thermal conductivity and high thermal vermiculite. Consequently specialists developed an effective insulation board GMG PT, which has high thermal insulation properties with a sufficiently high temperature resistance up to 1200 ºC, durability, and low density.

fireclay bricks and vermiculite board in comparison

options fireclay brick vermiculite board
coefficient of thermal conductivity at 500 ºC  W/mK 1,13 0,16
application temperature ºC 1600 1200
thickness of the body (cm) 55 12
body weight (kg) 2500 400
surface temperature ºC 106 81

Heat Conductivity and Fire Protection

The heat conductivity of expanded Vermiculite depends on the bulk density and the fraction. It should be noted that the size of the fraction, not the weight, has influence on the heat conductivity.

Sound Absorption

Due to the high porosity, vermiculite is particularly suitable for the insulation of buildings, movie theaters and recording studios. Acoustic properties of swollen vermiculite depend on the thickness of backfill, the size and shape of its grains, the oscillation frequency of sound. With the increase in the thickness of vermiculite in filling sound absorption intensity increases, reaching a maximum thickness of 50mm.

Dependence of sound absorption coefficient of expanded vermiculite from the thickness of the layer

vermiculite sound absorption coefficient at the frequency of oscillations
1000 Hz and the thickness of the layer in cm
1 2 3 4 5 6 7
exfoliated vermiculite
fraction 0-10 mm
0,15 0,46 0,58 0,60 0,77 0,70 0,65