Expanded perlite the major perlite markets are for expanded perlite, crude perlite are is used also in certain industrial applications including sandblasting, as a slag coagulant, special casting sand, and metal finishing. Perlite is an amorphous volcanic glass/ alumina–silicate rock that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently 1400–1800 F (760–980o C) to create a product termed expanded perlite. Expanded perlite has several attractive physical properties for commercial applications including low bulk density, high heat resistance, low sound transmission, high surface area, low thermal conductivity and chemical inertness. The major perlite markets are for expanded perlite
1. Low Bulk Density
2. High Heat Resistance
3. Low Sound Transmission
4. High Surface Area
5. Low Thermal Conductivity
6. Chemical Inertnessl
1. Sub-floor heating insulation
2. Lightweight plaster aggregate
3. Roofing shakes
4. Ceiling tiles
5. Tile, mortars & grouts
6. Chimney flu relining
7. Insulating Refractories
9. Ultra-fine bubble filler
10. Waste water treatment
Ambient & Low Temperature Insulation
The aerogel could be well filled into the pores of expanded perlite, and the resultant aerogel-modified expanded perlite possessed nanoporous structure with higher specific surface area. Heat insulation coatings prepared from aerogel-modified expanded perlite has good thermal insulation effect. Expanded perlite which consists of amorphous SiO2 has various advantages as insulation material, such as low bulk density, flame retardance and sound absorption. It is a economical and efficient insulation material, widely used in out wall insulation Building insulation is an important part of building energy conservation. It has been widely used in space insulation, biomedicine, sensors, drug delivery systems and catalyst carriers, but it is too expensive and fragile to building insulation.Thermal insulation materials usually included polyurethane and polystyrene foam plastics, these materials could bring potential danger because they are combustible and releasing poisonous smoke. Inorganic heat insulation coating has been the perfect material for building thermal insulation due to its weather resistance, safety and excellent insulation. Expanded perlite obtained after perlite was treated at high temperatures has a lot of micrometer pores like honeycomb and high porosity.
Expanded perlite powder with vaccum super insulation is used at cryogenic temperatures, adapted to applications at high temperature, such as the long term storage of hot water in solar thermal systems.the heat transport in evacuated perlite also used Coman models and approaches for gas heat conduction, solid- body conduction and heat transfer by thermal radiation. The vaccum super insulation with expanded perlite used for cryogenic applications, the storage of liquid gases at temperature between 20k and 90k. Expanded perlite is an amorphous, highly porous, granular material of volcanic origin. Its two main components are Al2O3 & SiO2. The low density temperature stability and high porosity are the main properties of expanded perlite.
Expanded perlite is a naturally occur siliceous volcanic rock containing 6% combine with water. The perlite expands 15 times its original volume. The excellent thermal conductivity of expanded perlite. Expanded Perlite is inorganic material. perlite loose fill insulation offers excellent fire resistant and thermal properties . Expanded perlite is ultra-lightweight, inert, sterile, permanent, incombustible, asbestos- free, non-toxic, rot and vermin proof and has a neutral pH. Expanded perlite insulation for low temperature and cryogenic application it is widely used because its low thermal conductivity, cost, handling low moisture retention and non flammability. Thermal conductivity of expanded perlite insulation atmospheric pressure condition with density, perlite gradation has only a minor effect on thermal conductivity. Expanded perlite is non hygroscopic in nature and it can be used under vacuum condition. Expanded perlite used insulating cover on the surface of molten metal to prevent excessive heat loss delays in pouring.