Fiberfrax® Duraboard®
Fiberfrax® Duraboard® high-temperature boards by Alkegen – six material lines for 1260–1649 °C.
SENN supplies the complete Fiberfrax® Duraboard® family from Alkegen: six rigid high-temperature boards made of aluminium silicate ceramic fibres (with Saffil® mullite fibre content in the high-temperature lines) for classification temperatures from 1260 °C to 1649 °C. High flexural strength, excellent chemical resistance and low thermal conductivity - ideal for linings that are subject to mechanical loads, need to be installed quickly and insulated economically. Includes original manufacturer data sheet for download.
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Advantages at a glance
- Six material lines for application temperatures from 1260 °C to 1649 °C
- Rigid and self-supporting - high bending strength, easy to cut and machine
- High surface quality for the LD, HD and 350ES lines
- Saffil® mullite fibre reinforcement in the 2600 and 3000 lines for maximum temperature stability
- Shrinkage < 2 % for the high-temperature lines (24 h at continuous use temperature)
- UL approval for Duraboard® LD (UL E75289 / MH7514)
- Thicknesses from 3 mm to 76 mm, sheet sizes up to 1067 × 1220 mm
- Original manufacturer data sheet can be downloaded directly from this page
Typical applications
- Solid wall linings in industrial furnaces, kilns and petrochemical furnaces
- Backfilling of dense bricks and castables (fireclay, corundum, mullite)
- Hot surface linings over fibre blankets ("board over blanket")
- Rigid high-temperature gaskets, baffles and switches (baffles & muffles)
- Chimney and flue linings in ovens and chambers
- Supports for infrared radiators
- Glass tank side and end walls, diffuser linings
- Channel linings and covers for liquid metals
- Heat protection for personnel, hot gas pipes, dryers and combustion chambers
- Industrial heat and fire protection
Six material lines in comparison
The Duraboard® family covers three temperature classes: four standard lines up to 1260 °C (classification), one high temperature line up to 1427 °C and the premium line up to 1649 °C. Within the 1260 °C class, the four lines differ mainly in terms of density, surface quality and strength - from the economical Refractory Grade (RG) variant to the high-strength High Density (HD) line. The two high-temperature lines (2600 and 3000) contain Saffil® mullite fibres for minimal shrinkage at very high temperatures.
Feature Duraboard® RG Duraboard® LD Duraboard® HD Duraboard® 350ES Duraboard® 2600 Duraboard® 3000 Classification temperature 1260 °C 1260 °C 1260 °C 1260 °C 1427 °C 1649 °C Continuous Use Temperature 1149 °C 1149 °C 1149 °C 1149 °C 1343 °C 1482 °C Melting point 1760 °C 1760 °C 1760 °C 1760 °C 1816 °C 1871 °C Nominal density 258 kg/m³ 258 kg/m³ 419 kg/m³ 288 kg/m³ 224 kg/m³ 192 kg/m³ MOR (green) 1724 kPa 1379 kPa 2068 kPa 2412 kPa 1034 kPa 1034 kPa MOR nach 24 h Soak 758 kPa 552 kPa 862 kPa 620 kPa 449 kPa 379 kPa Schrumpfung 24 h Soak < 5 % < 5 % < 5 % < 5 % < 2 % < 2 % Fibre base Aluminium silicate Aluminium silicate Aluminium silicate + clay Aluminium silicate Aluminiumsilikat + Saffil® Aluminiumsilikat + Saffil® Colour Cream / Tan White / Cream Cream White / Cream Cream Cream Duraboard® RG - Refractory Grade (1260 °C)
Duraboard® RG is the most economical line in the family. The rolled, consolidated surface offers high compressive and flexural strength as well as excellent abrasion and hot gas erosion resistance - ideal as a backing for dense refractory bricks in glass tanks and as a hot surface protective layer over fibre ceiling linings.
Duraboard® LD - Low Density with high surface quality (1260 °C)
Duraboard® LD has the same density and temperature class as RG, but is manufactured with tighter dimensional tolerances and a high-quality surface. Available in thicknesses from 3 mm to 51 mm (3"/4" on special order). Ideal as a sandwich core, in component production and wherever appearance is important as well as function. UL-certified (file E75289).
Duraboard® HD - High Density with clay additive (1260 °C)
Duraboard® HD offers the same dimensional and surface quality as LD, but achieves a significantly higher compressive strength and flexural strength (MOR 2068 kPa green) thanks to the addition of clay during the manufacturing process. Recommended for load-bearing applications such as backing firebricks or for spanning larger unsupported surfaces.
Duraboard® 350ES - Easy Strength, high-strength & machinable (1260 °C)
Duraboard® 350ES uses a special fibre formulation with a combined organic-inorganic binder system. The result: over three times higher strength than standard boards of the same density - with excellent machinability and reduced dust generation during cutting, punching and milling. First choice for punched moulded parts and CNC-machined components.
Duraboard® 2600 - High temperature line with Saffil® (1427 °C)
Duraboard® 2600 is a blend of Fiberfrax® aluminosilicate fibres and Saffil® mullite fibres. This formulation controls thermal shrinkage to less than 1 % after 168 h at 1343 °C - significantly better than the standard lines. For high temperature insulation with requirements for permanent volume stability.
Duraboard® 3000 - Premium line for highest temperatures (1649 °C)
Duraboard® 3000 is the highest temperature class of the entire Duraboard® family. With increased Saffil® mullite fibre content, it achieves a shrinkage of only 1.2 % after 168 h at 1482 °C Continuous Use Temperature. Recommended for the most demanding high-temperature applications where neither the 1260 °C lines nor Duraboard® 2600 are sufficient.
Original data sheet for download
The official manufacturer's data sheet from Alkegen with the complete specification table, application matrix and all six material lines is available for direct download:
We will be happy to provide a German translation of key content on request. Please contact us.
Note: REACH and CMR classification
Fiberfrax® Duraboard® panels are based on refractory ceramic fibres (RCF), which are classified as CMR Cat. 2 (suspected carcinogenic) in the EU. The instructions in the safety data sheet and suitable personal protective equipment (respiratory protection, protective gloves, safety goggles) must be observed during handling. The organic binders burn out when first heated to between 232 °C and 316 °C - adequate ventilation must be ensured during this phase. For REACH-compliant bio-soluble alternatives, we offer Insulfrax® products (alkaline earth silicate wool).
Frequently Asked Questions
Which Duraboard® line should I choose for an 1100 °C application?
All four 1260 °C lines are suitable for application temperatures up to approx. 1149 °C (Continuous Use Temperature): RG as the most economical choice for pure refractory applications, LD for visible applications with surface quality requirements, HD for load-bearing linings with higher compressive strength and 350ES for machined moulded and stamped parts.
What is the difference between Duraboard® 2600 and 3000?
Both lines contain Saffil® mullite fibres for high temperature stability. Duraboard® 2600 is designed for 1343 °C (continuous use) with less than 1 % shrinkage after 168 h at 1343 °C. Duraboard® 3000 has a higher Saffil® content and reaches 1482 °C continuous use with only 1.2 % shrinkage after 168 h at 1482 °C - the highest temperature class of the entire Duraboard® family.
What panel sizes and thicknesses are available?
Standard thicknesses are 3 mm, 6 mm, 13 mm, 25 mm, 51 mm and 76 mm. Panel sizes: 610 × 914 mm, 610 × 1220 mm and 1067 × 1220 mm. Not all lines are available in every combination - Duraboard® LD is the widest available (all thicknesses up to 51 mm), Duraboard® HD and LD are available in 76 mm and 102 mm on special order. Other sizes on request, subject to minimum order quantity.
Are Duraboard® panels REACH compliant?
No - all Duraboard® lines are based on refractory ceramic fibres (RCF, aluminium silicate), which are classified as CMR Cat. 2 in the EU. When handling, the instructions in the safety data sheet must be followed (respiratory protection, protective gloves). For REACH-compliant bio-soluble alternatives, we recommend the Insulfrax® product line made of alkaline earth silicate wool.
What does "burn out organic binders" mean when heating up for the first time?
Small quantities of organic and inorganic binders are added during the manufacturing process to give the boards handling strength. During initial heating by the end customer, the organic components burn out at temperatures between 232 °C and 316 °C in a controlled manner - adequate ventilation must be ensured. After burning out, the sheets are white in colour. For applications where organic burnout is not permitted, the sheets are available as a heat-treated (purely inorganic) variant on request.
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Since 2001, KS Kneissl & Senn Technologie GmbH
has been producing insulation materials and seals for a wide range of applications up to a temperature range of 1600 °C. A diverse range of machinery (CNC 5-axis milling, plotting, punching, sewing, water jet cutting, vacuum forming, etc.) enables us to shape a wide variety of materials for you. The main materials include: glass fibers, aramid fibers, mineral fibers, biosoluble fibers, ceramic fibers, silicate fibers, vermiculite, calcium silicate, microporous materials, elastomers (rubber, silicone, silicone foam, etc.), etc.
The company has been ISO9001 certified since 2009, currently in accordance with the 2015 revision of the standard.
