Perlite Ore

Application :

In the foundry industry, expanded perlite is most commonly mixed with exothermic powders and used in ladel topping, hot topping, and risering to prevent shrinkage cavities. Perlite is used as an insulating cover on the surface of molten metal to:

  • Prevent excessive heat loss during pouring delays.
  • Topping off ingots.
  • Producing refractory blocks and brings.
  • Acting as a lightweight castable.

In the construction sector it’s used in lightweight plaster mixer, insulation materials, thermal & sound absorption roof tiles as well as an auxiliary component in filters.

In the agriculture sector it renders the soil loose, allowing the air to circulate whereas it has a high level of water absorption. It’s an ideal solution for hydroponics crop.

Perlite is also used in the foundries and the cryogenic insulation sector.

Unexpanded Perlite ore sizes :

Perlite ore Expanded Perlite
10-16mesh 4-8mm
12-18mesh 3-6mm
14-20mesh 2-4mm
18-46mesh 1-3mm
50-70mesh 0.15-1.18mm

Specification of Perlite ore:

1. Chemicals Composition
SiO2 Al2O3 K2O Na2O Fe2O3 CaO MgO
70~75 12~15 2~5 3~4 0.1~1.5 0.8~2 0.1~0.3
2. Expanded perlite Physical Properties
Item Specification Item Specification
Bulk density Bulk density Thermal conductivity 0.021-0.054
Appearance white color, granular Softening point 890-1090 ºC
Melting point 1280-1350 ºC Vickers hardness 5.5-7
PH 6.5-7.5 Water soluble < 0.1%
Acid soluble < 2% Dioptre 1.483-1.506
Features Low density, poisonless, tasteless; Non-combustible,acid-resistant, alkali-resistant; Fireproofing, sound proofing, light weight, etc