Characteristics of graphite paper

Graphite paper is made of high carbon flake graphite through chemical treatment and high temperature expansion rolling. Its appearance is smooth, without obvious bubbles, cracks, wrinkles, scratches, impurities and other defects. It is the base material for the manufacture of various graphite seals. It is widely used in dynamic sealing and static sealing of machines, pipes, pumps and valves in electric power, petroleum, chemical, instrumentation, machinery, diamond and other industries. It is an ideal new sealing material to replace traditional seals such as rubber, fluoroplastics and asbestos.

The specification of graphite paper mainly depends on its thickness. Graphite paper with different specifications and thicknesses has different uses. Generally, there are specifications such as 0.05mm~3mm, and the thickness below 0.1mm can be called ultra-thin graphite paper.

Graphite paper is divided into flexible graphite paper, ultra-thin graphite paper, sealed graphite paper, thermally conductive graphite paper, conductive graphite paper, etc. Different types of graphite paper can play their due roles in different industrial fields.

Flexible graphite paper: refers to natural flexible graphite paper or roll material with thickness ranging from 0.025-0.10mm, which is made of natural expandable flake graphite after being expanded at high temperature and rolled. Its specifications and density must meet the following requirements:

Ultra-thin graphite paper: refers to graphite paper with a thickness of less than 0.07mm. It can be divided into less than 0.03mm, 0.03mm-0.05mm, and more than 0.05mm-0.07mm.

Thermally conductive graphite paper: It has excellent thermal conductivity and heat dissipation performance, and has a certain flexibility. It can be bent or directly attached to the surface of electronic equipment, and the heat will be uniformly dissipated in two directions through the surface of the thermally conductive graphite paper. Thermally conductive graphite paper has the advantages of small footprint, light weight, high heat dissipation efficiency, and easy cutting. Thermally conductive graphite paper can be compounded with other heat-dissipating metals to make thermally-conductive graphite sheets. The properties of graphite paper and metal sheets complement each other, making their products play a greater role in the field of heat dissipation.

Graphite paper mainly uses expanded graphite as raw material. After a series of processing techniques, graphite powder is pressed and rolled into flexible and thin paper-like graphite products.

Graphite paper has the following six characteristics:

1. Ease of processing: Graphite paper can be die-cut into different sizes, shapes and thicknesses, and die-cut flat boards can be provided, with thicknesses ranging from 0.05mm to 1.5mm.

2. High temperature resistance: the maximum working temperature of graphite paper can reach 400℃, and the minimum can be lower than -40℃.

3. High thermal conductivity: The maximum in-plane thermal conductivity of graphite paper can reach 1500W/mK, and the thermal resistance is 40% lower than that of aluminum and 20% lower than that of copper.

4. Flexibility: Graphite paper is easy to laminate with metal, insulating layer or double-sided tape, which increases design flexibility and can have adhesive on the back.

5. Lightweight: Graphite paper is 30% lighter than aluminum of the same size and 80% lighter than copper.

6. Ease of use: The graphite heat sink can be smoothly attached to any flat and curved surface.

According to these six characteristics, the graphite paper can be processed into graphite products such as flexible graphite packing rings, flexible graphite plates, graphite gaskets, and graphite washers.

When storing graphite paper, pay attention to the following two matters:

1. Storage environment: Graphite paper is more suitable to be placed in a dry and flat place, and it cannot be exposed to the sun to prevent being squeezed. During the production process, collisions should be reduced; it has a certain degree of conductivity, so it needs be kept away from power cord.

2. Prevent rupture: The graphite paper is very soft and can be cut according to requirements. In order to prevent them from breaking during storage, it is not suitable for folding or bending and folding at a small angle. The general finished graphite paper is suitable for rolling into a barrel or A4 paper for flat storage.

With the acceleration of the upgrading of electronic products and the growing demand for heat dissipation management of mini, high-integration and high-performance electronic devices, a new heat dissipation technology for electronic products has been launched, that is, a new solution to the heat dissipation problem of graphite materials. This new solution utilizes graphite paper for high heat dissipation efficiency, small footprint, light weight, and uniform heat conduction in both directions, eliminating "hot spot" areas, shielding heat sources and components while improving the performance of consumer electronics.

At present, the main applications of graphite paper are: notebook computers, flat panel displays, digital cameras, mobile phones and personal assistant devices. It can also be used for dynamic and static seals in electric power, petrochemical and other industries, replacing traditional seals such as rubber and asbestos, and is a new type of ideal sealing material.