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Photomicrograph of perlite Lightwieght hollow spheres.

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Typical Chemical Analysis

Typical Hollow Filler Product Data

Main Index > Markets > Industrial Applications > Lightweight Hollow Spheres

Perlite Lightweight Hollow Spheres


There are several classes of perlite lightweight fillers:

1. What are often called ultra fine fillers are made by milling and classifying expanded perlite under stringent quality control conditions to create particles with jagged interlocking structures.

2. What are called perlite bubbles or perlite hollow spheres are similar in size to the ultra fine perlite fillers but they are discreet bubbles containing a multi-cellular core. They too are produced under stringent quality control standards to guarantee consistency and quality. In addition, they can be produced with special surface treatments to provide additional benefits in special mixes and formulations.

3. Finally, there are what might be called basic or general light-weight perlite fillers where traditional expanded perlite in sizes from 2000 microns down to 500 microns are used as fillers in products and mixes. This Product Guide deals with perlite lightweight hollow spheres or bubbles as fillers.


Because of their unique multicellular structure, these lightweight perlite fillers can provide many advantages.

  1. Lightweight perlite fillers are effective bulk fillers because of their low density.
  2. Lightweight perlite fillers exhibit a uniform white color that has minimal to no effect on the color of the fmished product
  3. The particle shape of lightweight perlite fillers promotes good bonding between the perlite and resins.
  4. Some properties such as impact resistance and tensile strength may be enhanced by the particle shape and size of lightweight perlite fillers.
  5. Lightweight perlite fillers can reduce raw material costs while improving workability.
  6. When used with other fire retardant materials, light weight, inert and inorganic perlite fillers can enhance fire resistance.
  7. Perlite fillers are generally inert and perlite is listed in the U.S. Food Chemicals Codex.

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.


Lightweight hollow perlite spheres or bubble fillers should not be confused with other types of perlite fillers. Hollow bubble fillers are produced under demanding quality control conditions utilizing special technologies. Only certain perlite filler manufacturers produce perlite bubble-type fillers. For additional in formation contact your local perlite supplier or the Perlite Institute.

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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