What filling materials are used for high quality electric heating tubes?

What filling materials are used for high quality electric heating tubes?

When buying products, we all like to buy high-quality things, and when purchasing electric heating tubes, not only to look at its appearance, the internal filling material is also very important, that high-quality electric heating tube is the kind of filling material used?

First, we must first understand, what is the electric heating tube? The electric heat pipe is a metal tube as the shell (including stainless steel, copper tube), along the central axial distribution of spiral electrothermal alloy wire (nickel chromium, iron chromium alloy), the void filled with good insulation and thermal conductivity of magnesium oxide powder, the two ends of the pipe sealed with silicone, this metal armored electric heating element can heat air, metal mold and various liquids. Therefore, a good quality electric heating tube, the choice of filling material is also crucial.

2. The role of filling material in the electric heating tube: 1. The filling material plays an insulating role between the electric heating wire and the electric heating tube; 2. The filling material conducts the heat emitted by the electric heating wire to the electric heating tube shell; 3. The filling material is used to fix the space position of the electric heating wire.

3. Common fillers

1. Quartz sand: Quartz sand is widely used in low-end electric heating tubes, because the cost is low, but the corresponding insulation and thermal conductivity will be relatively poor, especially in high temperature tubes. When the temperature is higher than 450 degrees, its insulation resistance value begins to decline, so when the surface temperature of the tubular electric heating element is higher than 450 degrees, it is not suitable to apply this material as a filler.

4. Magnesium oxide powder: Magnesium oxide powder can be said to be now the most widely used a kind of electric heating tube filling material, now according to different working conditions, can be divided into low-temperature powder, medium temperature powder, high temperature powder, high-end magnesium oxide powder is used by high purity magnesium oxide powder, so that the insulation performance of the heating tube is better, so the price of magnesium oxide is constantly rising. Therefore, high-quality electric heating tubes all use high-purity magnesium oxide powder with high temperature resistance.

5.  Use effective and efficient powder filling machine is important part of production.  GTC offer various types MgO powder filling machines