Perlite

WHAT IS PERLITE?

Perlite products are made from a volcanic glass which contains water in its inner structure. When heated rapidly, the steam produced expands the glass to form a foamed structure. Four main families of perlite are manufactured by IMERYS: perlite ore, expanded unmilled perlite, expanded milled perlite refined for filter-aids use, expanded milled perlite refined for functional additive applications.

QUICK VIEW
Perlite Ore
Particle Size: (mm)0.074-0.5/ 0.6 – 1.7/ 1 – 2.5
Bulk Density: (g/L)1100
Expanded Unmilled Perlite
Particle Size: (mm)0-1/ 0–6/ 1–6
Bulk Density: (g/L)45 - 140
Filter Aids
Permeability: (Darcy)0.1- 5
Cake Density : (g/L)135 - 275
Functional Additives
D50: (μm)15 - 35
Bulk Density : (g/L)110 - 170
Oil Absorption: (% by weight)140 - 225
Blue Light:70 – 78
Particle shape:from tetrahedral to plate-like

PRODUCTION

Imerys owns and operates numerous perlite plants throughout the world, including a sizeable ore deposit in western Turkey, USA, China and Latin America, which are used to feed the various perlite expansion plants throughout the world.

QUALITY FROM ORE TO FINAL PRODUCT

IMERYS is one of the few perlite producers able to control the whole quality chain from the mine to the finished product.

AN EXTENSIVE NETWORK OF EXPANSION PLANTS

Imerys has an extensive network of expansion plants worldwide. Many of our manufactured products are standardized throughout our plants. This guarantees our customers a continuity of service and keeps transport distances to a minimum.

See map of operations.

PRODUCTION PROCESS

Perlite ore: production occurs in two stages; extraction of the crude ore at the mine, then drying & milling.

Expanded Unmilled Products: the perlite ore is injected into a naked flame in the base of the expansion tower. The perlite becomes soft enough to be expanded by its internal water which is vaporized.

Expanded Milled Products for Filter-Aids: the expanded perlite produced from the furnace is milled and classified. These different steps are controlled by the end application density and permeability of the filter-aid.

Expanded Milled Products for Functional Additives: in this case the milling and classification stages are controlled to obtain the required particle size and shape of the finished product.

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