Thin Insulation with Big Thermal Capabilities

Excelfrax® 550 Felt is manufactured from specially blended glass fibers – engineered for maximum thermal performance with minimal thickness – the perfect solution for high-speed appliances that require space-saving technology.

Product Information Sheet

Insulfrax LT

Excelfrax® 550 Felt is lightweight, flexible, and contains no organic binder

Temperature Grade
932°F / 500°C

Glass Microfiber

Specially Blended Glass Fibers

Excelfrax 550 Felt is manufactured from specially blended glass fibers and contains no organic binder. Excelfrax sheets are self-supporting, flexible, and lightweight. These exceptional thermal performance characteristics produce no emissions on firing. Our premium Felt exhibits thermal performance approaching that of Microporous products and can be used whenever space is limited, or premium thermal performance is required.

Excelfrax 550 sheets are available in a wide range of standard sizes. Sheets are easy to cut, convenient to handle, and can be formed into geometrically demanding shapes or wrapped around complex contours.

Typical applications


  • Compact, high speed ovens
  • Bakery/bread ovens
  • Domestic appliance (ovens, heaters, boilers etc.)


  • Heat shields

General Use and Other Industries

  • High-performance backup insulation

General characteristics

Exceptionally low thermal conductivity

Organic binder free – no smoke or fumes

Resistance to thermal shock

Good handling strength

Extensive thickness range

Easy to cut and install

Learn more about Excelfrax 550 Felt:
Premium thermal performance. Space-saving technology.


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