What is the Filling of the Electric Heating Tube?

Some people have such questions for heating tube: are electric heating tubes solid? Why does no electricity on the surface of the tubes?

Here are answers to your questions.

The electric heating tube must be solid, with a filling inside. As for the surface of the electric heating tube is not charged, please see the following reasons;

The role of filler in electric heating tube:

· Filling material plays an insulating role between electric heating wire and electric heating tube;

·The filler material conducts the heat emitted by the heating wire to the shell of the electric heating tube;

·The filler is used to fix the space position of the heating wire.

The surface of the electric heating tube is not charged because of the filler.

So what are the specific requirements for fillers?

· Has sufficient insulation performance and electrical strength;

· Has good thermal conductivity, that is, has a high thermal conductivity;

· Has an expansion coefficient similar to that of the heating wire;

· Chemically inert to the heating wire material;

· High heat resistance;

· Ability to withstand rapid temperature changes;

· Small hygroscopicity;

· Has high mechanical properties;

· Wide range of materials and low prices.