Industrial applications for perlite are the most diverse,
ranging from high performance fillers for plastics to cements for petroleum,
water and geothermal wells. Other applications include its use as a filter
media for pharmaceuticals, food products, chemicals and water for municipal
systems and swimming pools.
Additional applications include its use as an abrasive in soaps, cleaners,
and polishes; and a variety of foundry applications utilizing perlite's
insulating properties and high heat resistance. This same heat resistant
property is taken advantage of when perlite is used in the manufacture
of refractory bricks, mortars, and pipe insulation.
The properties which give perlite filter aids a competitive advantage
over competitive products are their not toxicity and low bulk density.
Their low bulk density is very important for the cost effectiveness of
the process because at the filtration bed it is the volume of filteraids
that matters and not their mass. Perlite filteraids are also preferred
in many industries because they allow filtration equipment to filter liquids
at a faster rate and for a longer time without the filter septum to be
Perlite filteraids are used in the filtration of wine, sugar and starch,
beverages, edible oil, as well as pharmaceuticals and chemicals.
Expanded perlite is an excellent filteraid, characterized by high purity
and inertness. It has the property of forming pre-coats and cakes of a
large number of pores, which can trap effectively the various solid impurities
from the liquid to be filtered. Their main advantages over competitive
products are their non-toxicity and low bulk density. Perlite filteraids
also facilitate the fast rate of filtration and high clarity of the liquid
and non evacuated Cryogenic service
Perlite insulation suitable for evacuated and nonevacuated cryogenic service
exhibits low thermal conductivity throughout a range of temperatures,
pressures, and densities.
In addition to excellent thermal properties, perlite insulation is relatively
low in cost, easy to handle and install, and does not shrink, well, warp
or slump. It also is noncombustible and meets fire regulations and can
reduce insurance costs.
Perlite in the steel and Foundry Industries
Perlite insulation is used in high temperature applications in the steel
and foundry industries such as ladle topping, hot topping and risering,
in topping compounds, in exothermic and insulating shapes, as a cushioning
agent, in molding sand and in the manufacture of refractory blocks and
Advantages of Perlite Hollow spheres or Bubbles as fillers
Because of their unique multicellular structure, these lightweight perlite
fillers can provide many advantages.
- They are effective bulk fillers because of their low
- Exhibit a uniform white color that has minimal to
no effect on the color of the finished product.
- The particle shape of lightweight perlite fillers
promotes good bonding between the perlite and resins.
- Some properties such as impact resistance and tensile
strength may be enhanced by the particle shape and size of lightweight
- Lightweight perlite fillers can reduce raw material
costs while improving workability.
- when used with other fire retardant materials, lightweight
, inert and inorganic perlite fillers can enhance fire resistance.
Because of these characteristics, perlite lightweight
hollow spheres or bubbles have been found to be cost effective in a number
of applications including the manufacture of adhesives, auto body putty,
cultured marble, coatings, patching compounds and stucco.