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Amatrium Materials AI
Thermal Ceramics Kaowool 333-E Paper
Categories: Ceramic; Oxide; Silicon Oxide

Material Notes: Kaowool 333-E expandable paper is an intumescent material produced from a unique blend of Kaowool high-purity ceramic fibers, special additives, and organic binders in a special paper-making process. At maximum expansion which occurs at approximately 1200°F (649°C), the paper expands up to 400% of its thickness. This results in the 333-E Paper being an excellent candidate for high-temperature gaskets and seals. During heat up and expansion, there will be some additional out-gassing of the intumescent additives.

Like all the other high-quality Kaowool paper products, this specialty paper is noted for its excellent flexibility, outstanding handling characteristics, and high-insulating value.


  • Low thermal conductivity and heat storage
  • Easily die cut for high temperature gasketing and seals
  • Thickness expansion up to 400%
  • Applications:

  • All purpose high temperature gasketing and sealing
  • Expansion joint insulation
  • Fireplace catalytic converter gasketing
  • Fire protection
  • Industrial furnace seals
  • Aluminum filter bowl gasketing
  • Information provided by Thermal Ceramics

    Data has not been recently verified. Please contact manufacturer for current information.

    Available Properties
    • Density
    • Tensile Strength, Ultimate, Fired
    • Tensile Strength, Ultimate
    • Melting Point
    • Maximum Service Temperature, Air
    • Al2O3
    • Carbon, C
    • SiO2
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