Far-infrared heating tubes adopt milky white fused silica glass tubes processed by special technology, paired with resistance composite materials as heating elements. Since milky white fused silica glass can absorb almost all visible light and near-infrared radiation emitted by electric heating wires and convert them into far-infrared radiation.
However, milky white quartz tubes have been basically phased out in current industrial infrared heating tubes. This is because the material is relatively brittle and cannot be made into long milky white heating tubes. Additionally, the milky white color has a light-shielding effect that blocks heat transfer. Moreover, the high wall temperature of such tubes limits their application to near-infrared heating only.
Quartz tube electric heaters are also known as halogen tube electric heaters. Their heating element is an electric heating wire inserted inside the quartz tube, which serves to support, protect and generate heat. These heaters utilize far-infrared quartz tubes for heating, with radiation as the heat transfer method. This method features strong penetration and precise directional heat emission.