Soft Graphite Felt – Flexible Refractory Insulating Material

High purity, high thermal stability.
Low thermal conductivity coefficient, no static electricity.
Easy cutting and machining.

Orderly placed soft graphite felt samples

Description

Soft 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. The soft graphite felt product range includes PAN-based soft graphite felts, rayon-based soft graphite felt,s and battery-grade soft graphite felt, offering specialized options tailored to various applications.

Additionally, we provide comprehensive vacuum furnace hot zone maintenance solutions, including graphite groove plate, rigid graphite felt, soft graphite felt, carbon-carbon composites and other high performance parts to meet the demanding requirements of various high-temperature environments and ensure efficient and reliable equipment operation.

Features

Low thermal conductivity and static-free
Low specific heat
Allow for rapid heating and cooling of furnaces.
High temperature stability
In oxidizing environments up to 350 °C, in protective or vacuum environments up to about 3000 °C for graphite and 1000 °C for carbon.
Easy machining
Can be cut with scissors or blades and suitable for small bending radius.
Good surface properties
Not subject to all molten metals.
High purity
Low sulfur and ash contents.
High resistivity
Coupling in an inductive field only occurs above 12 kHz.

Category

PAN-Based Soft Graphite Felt
Rayon-Based Soft Graphite Felt

PAN-Based Soft 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.

Table 1: Specification of PAN-Based Soft Graphite Felt
Model	Heat Treatment Temperature	Carbon Content	Density (g/cc)	Ash (ppm)	Available Thickness (mm)
CSF-1 Carbonized Soft Felts	1200 °C	≥ 97.5%	0.14–0.16	≤ 800	3/5/6/8/10/12.7
GSF-1 Graphite Soft Felts	2200 °C	≥ 99.5%	0.12–0.14	≤ 300	3/5/6/8/10/12.7
Notes: 1 MPa = 10.2 kgf/cm²; 1 W/m.k = 0.86 ^kcal/cm.h.°C These properties are typical values and not guaranteed.

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 Soft 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.

Table 2: Specifications of Rayon-Based Soft Graphite Felt
Model	Heat Treatment Temperature	Carbon Content	Density (g/cc)	Ash (ppm)	Available Thickness (mm)
CSF-2 Carbonized Soft Felts	1200 °C	≥ 98.5%	0.10–0.14	≤ 500	3/5/6/8/10/12.7
GSF-2 Graphite Soft Felts	2200 °C	≥ 99.9%	0.08–0.14	≤ 300	3/5/6/8/10/12.7
Notes: 1 MPa = 10.2 kgf/cm²; 1 W/m.k = 0.86 ^kcal/cm.h.°C These properties are typical values and not guaranteed.

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