Perlite is a volcanic glass formed when lava cools very rapidly, trapping small quantities of water. After mining, crude perlite rocks are crushed, dried, milled and screened to different grades. When graded perlite is heated to about 900ºC, the material undergoes its expansion process; the trapped water vaporizes and creates countless tiny bubbles in the softened glassy particles. In this process perlite expands 10-20 times its original volume changing from a rock to a lightweight material with cellular granules of porous nature.
A specific granulometry and special qualities are selectively chosen by Imerys according to the end market need for the Raw Perlite production. The procedures followed during this production are strictly controlled in order to ensure a material of high quality with uniform and unique properties.
Imerys provides more than 100 raw graded perlite solutions of various Imerys origins according to customer needs. Especially for cryogenics, the perlite grades applied are worldwide reference materials.
Please contact us to find out more about our offerings.