High Temperature Felts

Overview: High Temperature Felts

Final Advanced Materials offers felts and blankets resistant to high temperatures up to 2,500 °C. These products are mainly used for thermal and sound insulation for the manufacture of industrial furnaces, or as a component of thermal protection. Many industries use felts for their manufacturing processes. With varying densities and thicknesses, some references can be aluminized to improve their thermal properties.

Applications of Felts

• High temperature protection
• Electrical, thermal, acoustic insulation
• Alternative to asbestos and ceramic fibres
• Catalytic heaters
• Industrial furnace insulation

Comparative Table

Our range of Felts

Basalt Needled Felts, up to 700 °C

Made from basalt fibres of 8 to 16 μm, the felts are classified M0 according to European standard EN 13-501-1. Their temperature resistance covers from – 280 °C to 700 °C. They do not burn, do not melt, produce neither smoke nor toxic gases, and are environmentally friendly and recyclable. They are mainly used as electrical, thermal, and acoustic insulators. In addition, basalt fibre is the most environmentally friendly high temperature resistant material when it comes to both manufacturing and recycling it.

Applications

• High temperature protection
• Electrical insulation
• Thermal insulation

E-Glass Fibre Felts, up to 700 °C

E-glass fibres are the most widespread in use, whether in the textile industry or for composite materials. This high-quality fibre is distinguished by its resistance to high temperatures up to 550 °C and its excellent electrical insulating properties. This fibre is rot-proof, resistant to the most common chemical agents and dimensionally stable, even in the event of substantial variations in humidity and temperature. This felt has excellent mechanical, chemical and dielectric properties. In addition, it can be reinforced with a layer of aluminium to withstand radiant heat up to 1,650 °C.

Applications

• Acoustic insulation
• Thermal insulation

Silicate Fibre Felts, up to 1,200 °C

These felts are made of more than 98 % silica (S98) and have a silicate fibre base that allows them to withstand application up to 1,200 °C. Asbestos-free and inorganic, these products do not contain toxic substances and are not irritating. Thanks to their good thermal and mechanical properties, they are excellent alternatives to ceramic fibre-based products. Silicate fibre felts do not contain any organic binders. The fibres are mechanically bonded, which makes the felt compact, flexible and gives it a good hold during processing. S98 fibre felts are used in the shipbuilding and automotive industries as heat and acoustic insulation and as a component for thermal and fire protection.

Applications

• Heat insulation
• Acoustic insulation
• Component for thermal and fire protection

Ultra-Pure Silica Felts, up to 1,200 °C

Our ultra-pure silica felts contain 99.95 % SiO₂. Composed of silica fibres assembled with polyvinyl alcohol, they can be used in temperatures of up to 1,200 °C. Even at a continuous temperature of 1,000 °C, they do not shrink and retain a very low thermal conductivity and exceptional mechanical properties. Our felts are particularly popular in the aerospace industry for insulating engines thanks to their outstanding insulating and fireproof characteristics as well as their resistance to vibrations and their very long life. Mainly used between two refractory sheets, we also offer flexible solutions made with coated fabrics. Their outstanding properties are also useful for domestic applications such as catalytic heaters and industrial furnace insulation.

Applications

• Insulation of industrial furnaces
• Catalytic supports for heating systems
• Replacement of asbestos and ceramic fibre
• Thermal insulation in the manufacture of optical fibre
• Engine insulation in aeronautics

Biosoluble Fibres Felts, up to 1,200 °C

Biosoluble fibre felts are obtained from long fibres of alkaline earth silicate. With high thermal stability, they retain a flexible fibrous structure up to a temperature of 1,200 °C. Their high-temperature insulation performance is remarkable. This range of product contains no binders or lubricants and emits no smoke or odour when heated. Biosoluble fibre felts are flexible and easy to cut or install. Biosoluble fibre blankets are available laminated with an aluminium film to improve the thermal properties of the sheets. Biosoluble fibres felts’ composition excludes all carcinogenic classification as per Q in directive 97/69 EC, unlike pure silica and silicate fibres. Biosoluble fibres felts are an ideal solution to replace ceramic fibres.

Applications

• Chimney, furnace and pipe insulation
• Heating and furnace lining
• Heat shield
• Component in the manufacture of thermal protection

Soft Carbon & Graphite Felts, up to 2,000 °C

Carbon and graphite felts with thicknesses of 6 and 12 mm with a width of 1,200 and 1,270 mm are available. Specific widths can be provided and special shapes can be cut to your specifications. Soft carbon and graphite felts offer many advantages. They have low thermal conductivity which leads to energy savings of up to 75 %, high resistivity (coupling in an inductive field only occurs above 12 kHz) and do not charge with electrostatic energy. They are thermically stable in oxidizing atmospheres up to 350 °C, in protective or vacuum atmospheres up to approximately 2,000 °C for graphite and 1,000 °C for carbon. Their composition is very pure with very little sulphur and ash content.

Applications

• Thermal insulation for vacuum furnaces and inert gas furnaces
• Heated smelting and holding furnaces
• Inductively heated furnaces
• Filters for hot and/or corrosive gases and liquids, for molten metals
• Backing strips for soldering and welding

Rigid Graphite Felt, up to 2,000 °C

Rigid graphite felt is available with a thickness of 40 mm (max. size 1,524 x 1,219 mm). This product is made of graphite fibres and a carbon binder. It is suitable for temperatures up to 2,200 °C. Specific widths and shapes can be cut.

Applications

• Thermal insulation
• Support element
• Component of high-temperature furnaces

Zirconium Oxide Fibre Felts, up to 2,500 °C

ZYF zirconium oxide fibre felts are the result of the Zircar Process by Zircar Zirconia which transforms an organic fibre into a ceramic fibre. The new fibre usually has a diameter of 6 to 10 μm and a serrated outer face. It can withstand up to 2,500 °C. Zirconium oxide fibres are made of nearly 100 % zirconia phase stabilized with 10 % yttria. ZYF is a flexible, light weight, porous, needled felt. ZYF is an excellent all-purpose high temperature insulation that can be used in methods of crystal growing as iridium and platinum crucible insulation, and precious metal condensate reclamation material. These felts are inorganic and do not require organic binders.

Other versions have been treated to enhance their properties and are also available:

Felt type ZYF can be reinforced with Zircar Zirconia cement type ZR-CEM or with Zircar Zirconia hardener type ZR-RIG.

Other coatings or coatings are possible according to your needs.

Physical variables included in this documentation are provided by way of indication only and do not, under any circumstances, constitute a contractual undertaking. Please contact our technical service if you require any additional information.