Graphite Felt – Best Thermal Insulation Materials for Industrial Furnaces

Graphite felt, also known as graphite fiber felt, is mainly used as a thermal insulation and refractory material for various industrial furnaces including single crystal furnaces, carbonized furnaces, quartz furnaces, vacuum furnaces, thermal balance reaction furnaces, heat treatment furnaces, sintering furnaces, welding furnaces, and high-pressure furnaces for metallurgy, machinery, and chemical engineering industries. It is also used as a filter material for high-purity corrosive chemical reagents.

Graphite felt has a carbon content of over 99%, which is higher than carbon felt. Under non-oxidizing atmosphere conditions, its working temperature can be over 2000 °C. It features high tensile strength, high tensile modulus, low density, high temperature resistance, ablative resistance, corrosion resistance, high electrical and thermal conductivity, low thermal expansion, and self-lubrication. It works with graphite composite boards and graphite special-shaped parts to form the insulation layer of industrial furnaces.

Description

Graphite felt is a flexible insulating material for high temperature applications in inert or vacuum environments and is entirely made of carbon fibers. When used as an insulation material for high-temperature industrial furnaces, it can be bound and stitched with carbon ropes woven through special process. Due to its controlled internal structure and electrical conductivity, soft felts can also be used for energy storage like redox flow cells. 

Graphite felt is often divided into PAN-Based graphite felt,rayon based soft graphite felt,and soft felt for battery ;

It is widely used in the fields of high temperature vacuum furnaces, Intert gas furnance and redox flow cells.

PAN-Based  Graphite Felt

It is a refractory insulating material specially used in high temperature vacuum furnaces and inert gas furnaces with a working temperature of 3992 °F (2200 °C). It features high carbon content, good thermal resistance, low ash content, low sulfur content, good oxidization resistance, easy cutting and installation. If required, it can be purified to less than 10 ppm.

Application

Redox flow cell        Microbial fuel cells or biofuel cells            Furnace body insulation and parts 

Heat shields and heat sinks      Backing strips for welding        Cathodes for flow cell applications 

Used on the reaction surface in the electrochemical process    Work as catalyst substrates in the electrochemical process

Glass blowing pads and plumber pads   Ultralight furnace lamp wick     Automotive exhaust lining   Thermal insulation materials

Rayon-Based  Graphite Felt

Also known as viscose graphite felt, it is made of viscose based fibers (rayon) that are cured, shaped, and purified through secondary high-temperature processing, and pre-calcined at 4532 °F (2500 °C) to complete the graphitization of the material, making it suitable for working in environments above 2200 °C. It is a soft felt material with good flexibility and compressibility, and can be easily cut into different sizes.

Application

• Redox flow cell     Microbial fuel cells    Furnace body insulation and parts    Heat shields and heat sinks

  Backing strips for welding    Cathodes for flow cell applications      Used on the reaction surface in the electrochemical process

  Glass blowing pads and plumber pads      Ultralight furnace lamp wick                 Automotive exhaust lining

  Thermal insulation materials

Soft Felt for Battery

It is specially used as quality electrode material for most energy storage systems like vanadium redox flow battery. It adopts special fibers and weave design, aiming to achieve high liquid absorption and electrical efficiency applications. As continuous production equipment is adopted, it has many unique properties including flat, smooth surface, uniform thickness and overall electrochemical uniformity. Therefore , as electrode, it has excellent performance in Vanadium Redox Flow Battery (VRFB) battery packs with low internal resistance, uelectrochemical quality with uniform activity, good corrosion resistance, slow decay after multiple cycles and high energy efficiency.

Application

• Electrode material for most energy storage systems like vanadium redox flow battery.