Perlite is an amorphous volcanic glass which has a relatively high water content and occurs naturally. It has one of the most unusual property, i.e. it greatly expands when sufficiently heated.

Perlite becomes soft, as it is a glass, at a temperature of 850-900°C. The trapped water in the structure of perlite escapes and makes the material to expand 7 - 15 times of its original volume. The expanded material is brilliant white in color because of the reflectivity of the trapped bubbles.


Main Applications :


  • Construction and manufacturing fields.
  • Lightweight plasters and mortars, insulation, ceiling tiles and filter aids.
  • In horticulture, it makes composts more open to air, while having still a good water-retention properties.
  • It makes a good medium for hydroponics.
  • It is also used in foundries and cryogenic insulations.