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Main Index > Markets > Industrial Applications > Filter Aids

Perlite Filter Aids for Liquid/Solid Seperation


Perlite filter aids provide the user with a density advantage of from 20-50% over other filter aids which is an important consideration when comparing costs. Perlite filter cake density is only 110 to 270 kg/m3 (7to 17 lb/ft3 ). The dry density of perlite filter aid ranges from 100 to 200 kg/m3 (6 to 12 lb/ft3 ). Experience in a variety of applications in many industries has shown that users of filter aids can substantially reduce filtration costs without sacrificing performance by converting to perlite filter aids.


Perlite filter aids can be used with both pressure and vacuum filtration equipment by merely replacing present filter aid. Plant or laboratory filtration studies will enable the selection of the optimum filter aid to be specified and the dosage that is required. Perlite filter aid manufacturers have wide experiences in a variety of different filtration applications. Of special note is the fact that hen perlite filter aids are used with rotary vacuum filters, filter cakes exhibit less cracking than when other filter aids are used.


Due to their unique physical structure, perlite filter aids offer high flow rates with optimum clarity. They are especially applicable to highly viscous liquids such as syrup or gelatinous slurries requiring fast flow rates. Productivity, clarity, and flow rates may be increased through the use of perlite filter aids.


Perlite Filter aids are produced in a wide range of grades to economically meet the flow rate and clarity requirements of almost every industry.


Because they remain porous and do not compact, perlite filter aids afford easy cake release at the completion of a filtration cycle. Not only does this facilitate filter cleaning, but it reduces manpower requirements and increases productivity.


Perlite filter aids are sterile and inert and are widely used for filtering liquids in the beverage, food, and pharmaceutical industries. They do not impart taste, odor or color and are listed in the U.S. Food Chemicals Codex published by the National Academy of Sciences. This publication, which is a source of information on the quality and purity of food grade substances, is officially recognized by the U.S. Food and Drug Administration and has been adopted by many government agencies throughout the world.


A unique benefit to manufacturers using perlite filter aids in food processing is that spent filter cake material can be used as a component in animal feed in many countries throughout the world. This reduces spent filter cake disposal costs. In the U.S., this application has been approved by the Association of American Feed Control Officials (AAFCO).


Perlite filter aids are available throughout the world. Any manufacturer desiring to use the product can usually obtain it packaged in bags or in bulk.

In the past 30 years, perlite filter aids have gained acceptance in almost every industry concerned with the separation of liquids and solids. The following list, although not all-inclusive, should give an indication of the many applications where perlite filter aids are being used:

  • Food Processing:
    • Cider
    • Corn Syrup
    • Fruit Juices
    • Sugar
    • Pectin
    • Citric Acid
    • Vegetable Oils
    • Wine
    • Vegetable Juices
    • Beer Lard
    • Molasses
    • Soft Drinks
    • Casein
  • Pharmaceutical:
    • Enzymes
    • Epson Salts
    • Penicillin
    • Streptomycin
    • Tetramycin
  • Industrial:
    • Water Treatment
    • Sizings
    • Oil Recovery
    • Pool Water Treatment
    • Greases
    • Solvent Recovery
    • Disposal Wells
  • Chemical:
    • Inorganic Chemicals
    • Resins
    • Organic Chemicals
    • Sulfuric Acid
    • Polymers
    • Polyethylene
    • Brine
    • Adhesives
    • Titanium Dioxide
    • Fertilizers
    • Waste Disposal
  • Paints/Coatings/Textiles:
    • Waxes
    • Oils
    • Varnish
    • Gums
    • Shellac
    • Paint

Please contact your local supplier or the Perlite Institute for information on obtaining perlite for use as a filter aid.

Information given herein is from sources considered reliable, but no guarantee of accuracy can be made or liability assumed.  Your supplier may be able to provide you with more precise data.  Certain compositions or processes involving perlite may be the subject of patents.
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