This heating cable maintains the temperature by using the character of PTC (Positive Temperature Coefficient – resistance is proportional to the temperature). Carbon-mixed resin works as semi-conductive polymer by cross linking. It forms parallel electric circuit between two bus wires. If the outside temperature is low, the current increases and as a result the heating value increases. On the other hand if the outside temperature is high, it breaks the bonds between the carbon and the current decreases, resulting in the decrease of the heating value.

There are 110VAC (110~120V) model and 220VAC (208~277V) model. According to the heating value, there’s 3, 5, 8, 10, 15, 20 Watts/Feet (10, 16, 26, 33, 49, 66Watts/meter) model. The output is calculated with the standard temperature of 10℃(50℉).

According to the maximum exposure temperature, it is categorized as low temperature unit(85℃), middle temperature unit(135℃), and high temperature unit(215℃)

The heating element of one (or two) strands are insulated with Magnesium Oxide Powder that has 2600℃ heat resistance character. And it’s sheathed with metallic materials.

According to the sheath materials, there are Inconel type, Alloy825 type, Stainless Steel 316 type, Coupro nickel type, and Copper Sheath type. According to the maximum voltage, it is categorized as 300V, 600V, and 750V rating type.

Recently the outer sheath is produced with drawing method rather than welding method. Because it has seamless form which does not have the joints, its durability is the best among all heating cable products. It also has high heat resistance(800℃).

4. Although it has various advantages, it needs sophisticated design. Because of the series heating method, available usage length must be considered while deciding the model. For the process of welding the connection between cold lead part, special technology from the expert company is required

Korea EHT introduced MI (mineral insulated) heating cable for the first time in Korea in 1989.

Heating element with various resistance value is insulated with fluoropolymer.

It has the structure of heating element / fluoropolymer sheath / tinned-copper braiding / over jacket fluoropolymer. Various resistance values (0.0117 ~ 1500ohm/m) can be applied according to the circuit length. It has the best flexibility.

The material of fluoropolymer used for the insulation sheath is PFA, PTFE. Its maximum exposure temperature is 260℃.

The heating element uses low-resistance material (nickel-plated copper). As a result, this product can be used for long line design that has several kilometers of circuit length from one power supply.

It has 3-level insulation structure – heating element / 1st fluoropolymer sheath / 2nd fluoropolymer sheath / tinned copper braiding / fluoropolymer outer jacket.

According to the type of fluoropolymer used for the insulation sheath, it has maximum exposure temperature of 200℃(FEP) or 260℃(PFA).

One strand (or several strands) of tube, heating cable and insulation material are sheathed with PCV material. It is pipe/heating/insulation in one product.

The material of tube, number of strand, material and thickness of heating cable and insulation material are designed according to its usage.