Fiberfrax® High Index Fibers

Fiberfrax® Refractory ceramic fibers are a family of high temperature fibers designed to be used in a variety of industrial and commercial applications. Manufactured from alumina-silica materials these fibers offer such characteristics as high temperature stability, low thermal conductivity, low heat storage, excellent thermal shock resistance, light weight, and superior corrosion resistance. Fiberfrax Refractory ceramic fibers exhibit thermal stability at temperatures up to 1260°C (2300°F).

Unifrax offers several high-index fibers ranging in fiber index from 68% up 95+%. Fiberfrax® High-Index Fibers have proven to be a good reinforcement material for use in automotive brake lining and other friction materials. Fiberfrax High-Index fibers can also be used as a mechanical thixotrope in coatings applications offering reinforcement and fire resistance as additional benefits.

Fiber index is a measurement which determines the amount of fiberized material in the actual fiber. During fiber manufacturing (shot) or unfiberized material is produced as a natural product of the furnacing process. Unifrax has the ability to reduce the amount of shot in a fiber by controlling the furnacing process or by washing out the unfiberized material. Unifrax offers several high index fibers ranging in fiber index from 68% up 95+%.

Fiberfrax High Index Fibers come in a variety of products such as:

  • HS 70/HS 70C
  • HS 95/HS 95 C


Safety Data Sheets

Fiberfrax® High Index Fibers

Product Information Sheet

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