How to choose electric silicone rubber heating pads

- Nov 30, 2020-

How to choose electric silicone rubber heating pads

Definition of electric silicone rubber heating pads

Thermally conductive electric silicone rubber heating pads is a kind of thermally conductive medium material synthesized by special process withsilicone rubber as the base material and various auxiliary materials such as thermal powder and flame retardant. People in the industry also call it thermally conductive silicone rubber heating pads and silicone thermal conductive pads.

The role of silicone heating sheet
1) The thermal conductiveelectric silicone rubber heater only plays a role of heat conduction, forming a good heat conduction path between the heating element and the heat sink, and forms a heat dissipation module together with the heat sink and structural fixing parts (fan).
2) The main purpose of the thermal conductive silicone rubber heating pads is to reduce the contact thermal resistance between the surface of the heat source and the contact surface of the heat sink.
3) The thermal conductive silicone rubber heating pads can fill the gap of the contact surface well and squeeze the air out of the contact surface. Air is a poor conductor of heat, which will seriously hinder the transfer of heat between the contact surfaces; with the supplement of the thermal conductive silicone rubber heating pads, you can Make the contact surface better and fully contact, achieve face-to-face contact, and the temperature response can reach the smallest possible temperature difference.


Advantages and disadvantages of  electric silicone rubber heating pads


1. The material is softer, the compression performance is good, the thermal insulation performance is good, the adjustable range of the thickness is relatively large, suitable for filling the cavity, the two sides have natural viscosity, and the operability and maintenance are strong.
2. The main purpose of selecting thermal silicone rubber heating pads is to reduce the contact thermal resistance between the surface of the heat source and the contact surface of the heat sink. The thermal silicone rubber heating pads can fill the gap of the contact surface well;
3. Since air is a poor conductor of heat, it will seriously hinder the transfer of heat between the contact surfaces, and the installation of a thermally conductive silicone rubber heating pads between the heat source and the radiator can squeeze the air out of the contact surface.
4. With the supplement of the thermal conductive silicone rubber heating pads, the contact surface between the heat source and the radiator can be fully contacted and face-to-face contact. The temperature response can reach the smallest possible temperature difference;
5. The thermal conductivity of the thermally conductive silicone rubber heaing pads is adjustable, and the thermal conductivity is more stable.
6. The process gap in the structure of the thermally conductive silicone rubber heating pads is bridged, and the process gap requirements of the radiator and the heat dissipation structure are reduced.
7. Thermally conductive silicone rubber heating pads has insulating properties (this feature requires appropriate materials to be added in the production).
8. The thermal conductive silicone rubber heating pad has the effect of shock absorption and sound absorption.
9. The thermal conductive silicone rubber heating pad has the convenience of installation, testing and reusability.


Disadvantage
Compared with thermal conductive silicone grease, thermal conductive silicone rubber heating pad has the following disadvantages:
1. Although the thermal conductivity is higher than that of thermally conductive silicone grease, the thermal resistance is also higher than that of thermally conductive silicone rubber heating pads.
2. The thermal conductive silicone rubber heating pad with thickness less than 0.5mm has a complicated process and relatively high thermal resistance.
3. Thermally conductive silicone grease has a larger temperature resistance range, thermally conductive silicone grease: -60℃~300℃, thermally conductive silicone rubber heating pads: -50℃~220℃;
4. Price: Thermally conductive silicone grease has been widely used and the price is relatively low. Thermally conductive silicone rubber hating pads are mostly used in thin and small electronic products such as notebook computers, and the price is slightly higher.


How to choose electric silicone rubber heating pads
Generally, before choosing a thermally conductive silicone rubber heating pad, you should consider the following: electronic product structure, thermal conductivity, size, thickness, thermal resistance, and expected effects.
1. Product structure design selection
In the early stage of the structural design of electronic products, it is necessary to consider the integration of thermally conductive silicone rubber heating pads into the design questions. Under different requirements and use environments, the heat dissipation schemes are different, and the optimal heat dissipation scheme should be selected according to the actual situation, and a reasonable heat dissipation structure should be designed. Increase the effect of thermally conductive silicone rubber heating pad.
2. Selection of thermal conductivity of thermally conductive silicone silicone rubber heating pad
The choice of thermal conductivity depends on the effect you expect to achieve, and the other depends on the power consumption of the heat source and the heat that can be dissipated by the design of the radiator or heat dissipation structure.
According to these requirements, select the thermal conductivity of the thermally conductive silicone sheet. The cost of low thermal conductivity is relatively low, on the contrary, the effect of high thermal conductivity is better, but the cost is also higher.
3. Selection of the thickness of the thermally conductive silicone rubber heating pads
This thickness should take into account the heat dissipation scheme used by the electronic product itself. If the heat dissipation structure is selected for heat dissipation, the morphology and structure of the contact surface of the heat dissipation structure should be considered, and the design structure and the thickness of the thermal silicone rubber heating pad should be balanced. The choice of thickness is also related to the product's hardness, density, compression ratio and other parameters.
4. Selection of the size of thermally conductive silicone rubber heating pad
The size of the thermally conductive silicone sheet can cover the heat source, and the breakdown voltage, resistance, surface resistivity, etc. can meet the conditions.