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.

Excelfrax® 550 Felt is lightweight, flexible, and contains no organic binder
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Temperature Grade |
932°F / 500°C |
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Composition |
Glass Microfiber
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Chemistry |
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
Appliances
- Compact, high speed ovens
- Bakery/bread ovens
- Domestic appliance (ovens, heaters, boilers etc.)
Automotive
- 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
