The chemicals in your treatment liquids demand the utmost of the chemical resistance of the materials used. When choosing the materi- als the physical processes (possible encrustment) and thermal limits (surface power density) have to be taken equally into consideration. The advantages and disadvantages of the individual materials are il- lustrated in the chemical resistance list. The following table gives an overview of the standard types available. The specific surface power density for the immersion heater tube is stated in W / cm2 according to the minimum immersion depth and the rated power. 

Immersion Tube Material Specifications