The heating magnetic stirrer is a commonly used instrument in the laboratory, mainly to achieve heating and stirring functions:
Heating function: The heating device is set on the chassis, and the corresponding device is also set to monitor the heating. The working surface will be equipped with a temperature sensor (thermocouple).
Stirring function: The magnetic stirrer is driven by a permanent magnet located under the working plate. The permanent magnet can penetrate the working disk surface. The magnet is directly fixed on the rotating shaft of the motor, and the rotating rod is rotated by the motor to drive the stirring rod to rotate.

Heating the top surface of the magnetic stirrer plays the role of carrying the working medium, heat conduction, magnetic conduction and corrosion resistance. The top plate is one of the key components of a heated magnetic stirrer. After years of development, the disk has also formed a variety of different materials and specifications:

1. Pure metal plate surface <br> Generally, metal materials such as aluminum alloy or stainless steel are used as the disk surface, which has the advantages of economy and simple processing. Mostly used for economical heating magnetic stirrers. The maximum temperature is generally below 350 °C. During use, it is limited to the nature of the metal itself and is susceptible to corrosion and oxidation by chemical agents. After long-term use, the surface of the metal plate will be affected by corrosion, and the corrosion may occur even in severe cases. The phenomenon of rust wear greatly affects the performance of the instrument.

2, ceramic disk surface <br> In order to solve the problem of corrosion resistance of the metal disk surface, a layer of ceramic is covered on the metal disk surface to make a ceramic disk surface. Ceramics are much more resistant to corrosion than solvents such as acids and bases. Thanks to the protection of the ceramic, the corrosion resistance of the disk surface has been greatly improved.

3, ceramic glass plate surface <br> Ceramic glass, also known as glass-ceramic glass, is a combination of crystal phase and glass made by high temperature melting, forming, heat treatment. Ceramic glass has the advantages of high mechanical strength, adjustable thermal expansion, thermal shock resistance, chemical resistance, low dielectric loss, etc. It is the disk material of a new generation of heated magnetic stirrer. Ceramic glass has the property of transmitting infrared rays and can be heated by infrared radiation. Ceramic glass panels are commonly used in high performance heated magnetic stirrers.

WIGGENS's WH220/240, SLR and other series use the latest ceramic glass plate surface, infrared radiation heating method, with chemical corrosion resistance, high thermal conductivity, high heating efficiency and so on. The WH220/240 series has a maximum temperature of 500 °C and is heated by infrared radiation. It can effectively increase the working efficiency for jobs that require large volume and rapid heating, such as medium melting. Compared with the ordinary heating magnetic stirrer, the infrared radiation heating can save more than 30% of the energy consumption by the same working efficiency, and is a veritable laboratory green instrument.