High Quality Chemical Stability Graphite Soft Felt Carbon Fiber for Vanadium Redox Flow Battery

Product Description

Product Description

Graphite Felt

Graphite felt is a flexible, high-temperature refractory material, typically made by subjecting carbon fibers to a special high-temperature graphitization process. It retains the excellent properties of bulk graphite, such as high purity, high-temperature resistance, corrosion resistance, non-melting, low thermal conductivity, and dimensional stability at high temperatures. Additionally, it is characterized by being lightweight, elastic, and easily foldable or cut.

Specification

Main Classifications

Graphite felt is usually classified by raw material, product form, or purity. In the market, it is often mentioned alongside Carbon Felt, with graphite felt being the product derived from carbon felt after further high-temperature graphitization.

By Product Type

By Raw Material

1.Soft Felt / Flexible Felt

Description:No binder between fibers, allowing bending and folding; easy to process.

Main Applications:Thermal insulation in vacuum/inert gas furnaces, battery electrode backings, filtration.

2.Rigid Felt
Description:Solidified into shape by adding a carbon-based binder or Chemical Vapor Deposition (CVD); stable structure and high mechanical strength.
Main Applications:Linings for large-sized vacuum furnaces, insulation layers requiring high mechanical strength.

1.PAN-based Graphite Felt
Description:Produced using Polyacrylonitrile (PAN) fibers as the raw material.
Advantages:High strength, high purity, excellent chemical resistance, and oxidation resistance (relative to Rayon-based).
 
2.Rayon-based Graphite Felt
Description:Produced using Rayon fibers as the raw material.
Advantages:Produced using Rayon fibers as the raw material.

Key Functions and Applications

The main functions of graphite felt are concentrated in thermal insulation and electrochemical fields.

1. Thermal Insulation

Graphite felt is an ideal thermal insulation material for vacuum and inert gas furnaces.

Performance Characteristics: Extremely low thermal conductivity, high thermal stability, low shrinkage, low density, and high-temperature resistance (up to approximately $3000^\circ\text{C}$ in non-oxidizing atmospheres).
Application Fields:

Monocrystalline Silicon Smelting Furnaces: Used as thermal insulation material.
Vacuum and Inert Gas Furnaces: Used as furnace lining, heat shields, and insulation layers around heating elements.
Aerospace and Defense: Used in thermal protection systems.

 

2.Electrode Felt

Due to its high electrical conductivity, high surface area, and chemical resistance, graphite felt is widely used as an electrode material.

Performance Characteristics: Good electrical conductivity, porous structure provides a high surface area, and excellent chemical stability.
Application Fields:

Flow Batteries: Especially as the core electrode material for Vanadium Redox Flow Batteries (VRFB).
Fuel Cells: Used as Gas Diffusion Layers (GDL) or electrode components.
Electrochemical Processing: Used in various electrochemical reactions and chemical processing.

Important Notice

Inert or Vacuum Atmosphere (Insulation): When used as a high-temperature insulation material, graphite felt must be used under a vacuum or an inert gas (e.g., Nitrogen) atmosphere to prevent oxidation by oxygen in the air at high temperatures.

Electrochemical Activation (Electrode): When used as an electrode in flow batteries, it usually requires pre-treatment (activation) to enhance its specific surface area and electrochemical activity.

Temperature Limits: Although high-temperature resistant, the long-term operating temperature should not exceed the manufacturer's recommended maximum service temperature. Its maximum temperature in an oxidizing atmosphere is much lower than in a non-oxidizing atmosphere.

Detailed product parameters
Polyacrylonitrile-Based Graphite Soft Felt (at 2200℃)
Item	Unit	Technical Value
Density	g/cm³	0.1–0.13
Carbon Content	%	>99.9%
Ash Content	ppm	≤300
Tensile Strength	Mpa	≥0.15 (Parallel) ≥0.08 (Perpendicular)
Thermal Conductivity(25°C)	W/m·k	≤0.16
Treatment Temperature	°C	≥2200
Water Absorption	%	<1
Thickness	mm	3–10
Resistivity (Longitudinal)	Ω·m	<50
Resistivity (Transverse)	Ω·m	<5
Width	m	1–1.6
Polyacrylonitrile-based Laminated Cured Graphite Felt
Item	Unit	Technical Value
Density	g/cm³	0.25–0.3
Carbon Content	%	>99%
Ash Content	ppm	≤500
Tensile Strength	Mpa	≥1.1 (parallel)≥0.8 (perpendicular)
Thermal Conductivity (25°C)	W/m•k	≤0.18
Treatment Temperature	°C	≥1800
Water Absorption	%	<1
Thickness	mm	5–200
Resistivity (Longitudinal)	Ω•m	<5
Resistivity (Transverse)	Ω•m	<5

Company Profile

Qingdao TTWY International Trade Co., Ltd

Our company specialized in producing casting equipment. It is located in Qingdao,a beautiful harbor city,which is convenient in transportation. Especially in Refractory products, for expamle, the Quartz Crucible,Graphite crucible,Fire Assay Clay Crucible,Mullite Ceramic Crucible,Zirconia/Alumina(Al2O3) Ceramic Crucible , etc;

With high quality,reasonable price and attentive service the products produced by TTWY have wined trust from clients at home and aboard.

Packaging & Shipping

FAQ

Q1: What information should I let you know if i want to get a quotation?
A: The required material dimension (Thickness*Width*Length,diameter*length; if possible, please kindly supply us drawings).
The required more information, such as Surface Condition, Tolerance Request, The Quantity, and other mechanical and technical details.
     
If it is possible, please also provide the application of products, we will recommend the most suitable products with details for confirmation.
 
Q2: How do you gurantee the quality of the products?
A: Each step of production and finished products will be carried out inspection by QC department before storing in the warehouse. NG goods are not allowed in the completed goods warehouse.
 
Q3: Can you guarantee the prompt delivery?
A: Yes, when we get your inquiries, not only we will evaluate the more competitive price, but also we can get the most reasonable delivery time. So the prompt delivery can be guaranteed.
 
Q4: What is your lead time? 
A : It usually needs about 15- 20 days after receiving the PO. 
 
Q5 : What is your payments terms?
A : T/T, L/C, Western Union, etc., could be acceptable. 
 
Q6 : Can we visit your company?
A : Yes, for sure, It's my pleasure to visit our company.
 
Q7 : What is the shipping cost?
A: The shipping cost is determined by the destination port, weight, packing size, total CBM of the products, we will try best to get the most reasonable shipping cost from the forwarders or express couriers to help you save more money.
 
Q8 :What is the transportation way?
A:If the Gross Weight ≤45kg, it's better by express such as TNT, DHL, FedEx,, etc. 
If the Gross Weight between 45kg to 100kg, by express or by air to your nearest airport can be both considered.
If the Gross Weight ≥ 100kg ,you can choose by Air or Sea to the nearest port.
 
Q9 :How service you can offer your clients? 
A:We provide presales service in various forms, for example, making investment budget,manufacturing planning,etc.so that customer make a reasonable plan with less cost. Moreover,we will also provide after sale service ,for example,free training about machine applications ect. 

Update Date:2026/01/28