Rigid and soft carbon insulation

CALCARB® CBCF, a unique microstructure…

CALCARB® CBCF is made up of carbon fibres measuring just a few millimeters in length, emanating from rayon fibres. These fibres are interconnected in a matrix produced by the carbonisation of phenolic resin.

The material is then vacuum-treated at temperatures above 2,000°C to ensure its temperature stability and the absence of outgassing. As a benchmark, the material contains no more than 500 ppm of impurities. Impurity levels below 20 ppm can be achieved through a halogen purification process.

Calcarb® for extreme insulation performance

CALCARB® provides the best thermal insulation properties at a high temperature, making it the material of choice among our customers concerned about the energy efficiency of their process. Density and grade differences are used to modulate the material's thermal characteristics:

• CALCARB® CBCF 14VF-2000 for unparalleled insulation performance
• CALCARB® CBCF 18-2000 or CBCF 25-2000 for modulating between insulation and gas permeability

Calcarb® to optimize the efficiency of your processes

CALCARB® rigid insulation is much easier to machine than other high temperature insulation materials. Its homogeneity, combined with its ability to be machined into very complex shapes, enables precise thermal gradient control in high temperature processes. Standard dimensions:

• Plates up to 160 x 1,500 x 1,500 mm
• Cylinders up to Æ 1,100 mm

Calcarb® for an extended service life, even in the most aggressive environments

Mersen has developed a complete range of processes designed to reinforce the resistance of CALCARB® CBCF in aggressive environments:

• Pyrocarbon infiltration-CVI protects the material from the action of reactive gases to its core.
• A unique development now allows the CALCARB® insulation using silicon carbide SiC-CVI to reduce the felt's reactivity tohydrogen above 1,000°C.
• To ensure gas impermeability and significantly reduce the generation of dust through erosion,CALCARB® can be surface coated by Calfoil,Calcoat and Calcoat CVD processes.

CALCARB® soft graphite felt by MERSEN for its high flexibility and adaptability

Its high geometric adaptability enables even the most complex shapes for insulating almost any system design to be implemented. Specific shapes can also be produced in large quantities through punching. Soft felts can be stabilized through chemical vapor infiltration, or CVI, with carbon and transformed into self-supporting structures.

CALCARB® graphite soft felt by MERSEN is a rayon based material that is an ideal choice for vacuum furnaces or process temperatures above 2000° C. Carbon soft felt is an alternative to graphite felt for applications where chemical purity is not as critical. 

CALCARB® graphite felt is produced in in widths up to 1,2 meter and available in different thicknesses. It is typically processed to temperature above 2200° C, and can be purified to less than 20 ppm total ash content. Carbon felt is typically processed to a minimum temperature of 1400° C.

CALCARB® soft felt by MERSEN is flexible and easy to cut, making this product easy to adapt with small bend radius possibilities. Soft felt is the ideal solution when vibrations are generated by high gaz quenching rates.

You benefit from these advantages:

• Up to 3000° CHigh purity
• No electrostatic charging
• Low heat capacity
• Low thermal conductivity
• Highly flexible

GRAFSHIELD GRI® by MERSEN for rigidity and strength

GRAFSHIELD GRI® insulation is a rigid and sturdy material made with 100% bonded carbon fiber.  This product has been a mainstay in several industries for the processing of high-value materials and parts. 

GRAFSHIELD GRI®  insulation panels feature outstanding durability and provide customers with optimal solutions to achieve superior energy efficiency, long product life, cost effectiveness, and temperature uniformity.  The strength-to-weight ratio is such that the product features low thermal mass and easy handling while being strong enough to withstand rapid temperature and pressure fluctuations.  Available in a variety of panel sizes as well as customized parts, GRAFSHIELD GRI®  by MERSEN insulation is easily machined and able to hold fine detail.

GRAFSHIELD GRI®  insulation boards by MERSEN help to manage radiant, conductive and convective heat transfer with compact, lightweight and durable insulation components. They are specially designed to help customers improve their performance and profitability by reducing their energy and maintenance costs. 

GRAFSHIELD GRI®  insulation boards by MERSEN product uniformity and consistent high quality ensure our customers are always getting the absolute best insulation material to meet their needs.