Expanded perlite is a white, ultra-lightweight aggregate ranging from a very fine powder to an aggregate with a particle size up to 6mm in size. It is inorganic, inert, neutral in pH, biologically stable and has no asbestos content. It has excellent thermal insulation properties over an extremely wide temperature range from cryogenics at minus 273°C (absolute zero) up to refractory applications at over 1000°C. It also has a highly adsorbent surface and a very low bulk density which makes it an ideal carrier or low cost filler for many compound formulations.
Perlite is a white, ultra-lightweight aggregate ranging from a very fine powder to an aggregate with a particle size up to 6mm in size
Perlite is widely used in commercial hydoponics, seed starting and plant rooting, as a soil conditioner, and to enhance the water-holding and anti-compaction properties of growing soils.
Perlite can be supplied in a number of grades, dependant on the particular requirements of the application.
| Name | Nominal Size (mm) | Loose Poured Bulk Density (kg/m) | Datasheets |
|---|---|---|---|
| P0 Micronised | 0.01 – 0.5 | 65 – 95 |  P0 |
| P3 LW Cryogenic | 0.75 – 1.2 | 35 – 55 (LW) | P3LW |
| P3 HD Extra fine | 0.75 – 1.2 | 55 – 85 (HD) | P3HD |
| P05 Ultrafine | 0.01 – 1.0 | 90 – 180 | P05 |
| P10s Super Fine | 0.75 – 2.0 | 80 – 100 | P10S |
| P10B High Fine | 0.75 – 2.5 | 80 – 110 | P10B |
| P15 Medium | 0.75 – 3.0 | 90 – 130 | P15 |
| P25 Special | 1.0 – 3.0 | 90 – 120 | P25 |
| P35 Standard | 1.0 – 5.0 | 90 – 120 | P35 |
| P45 Supercoarse | 1.0 – 5.0 | 90 – 120 | P45 |
| SILVAPOR | 1.0 – 5.0 | 110 – 130 | SILVAPOR |