Perlite is a generic term for naturally occurring siliceous rock. It is distinguished from other volcanic glasses, when heated to a suitable point in its softening range, it expands from four to twenty times its original volume. This expansion is due to the presence of two to six percent combined water in the crude perlite rock. When quickly heated to above 871°C (1600°F), the crude rock pops in a manner similar to popcorn as the combined water vaporizes and creates countless tiny bubbles which account for the amazing light weight and other exceptional physical properties of expanded perlite.

This expansion process also creates one of perlite's most distinguishing characteristics: its white colour. While the crude rock may range from transparent light gray to glossy black, the colour of expanded perlite ranges from snowy white to grayish white.

 

Expanded Unmilled Perlite (EUP)

The unusual combination of foamed structure and inertness offer many diverse applications for this unique product. Bergama Mining Perlite produces a range of particle sizes,

  • 1mm diameter and above - Cryogenic Insulation, Horticulture (Hydroponics)
  • Less than 1mm - Lightweight Aggregates, Textured Coatings

 

Expanded Milled Perlite (EMP)

Much of the production of EMP is dedicated to the purposes of filtration. The combination of the inert silica composition and the ragged structure offer remarkable properties for the filtration of liquids that are heavily charged in suspended solids, such as sugar syrups and alginate.

Although not possessing the clarifying power of diatomaceous earth, perlite filter aids, are far lighter in density and make ideal precoats for filters prior to the addition of diatomaceous earth as the main filtration aid.

On their own, perlite filter aids offer much better capacity than diatomaceous earth to retain large quantities of suspended solids without blocking the filter.