Large diameter quartz tube does not need coating, radiance is stable, high temperature does not deform, no harmful radiation, no environmental pollution, high temperature resistance, high corrosion resistance, good chemical stability, small thermal inertia, fast thermal response, and high heat conversion efficiency. The heating temperature can be selected by oneself, and the radiation performance does not deteriorate after long-term use. The structure is reasonable and convenient to use. Quartz tube is a selective radiation far-infrared heating element in China. Widely used and highly applicable. It can be widely used in heating and drying, solidification and dehydration, as well as heating equipment for various drying channels, drying rooms, and ovens in electromechanical, chemical, electronic textile, printing and dyeing, plastic, printing, grain, food processing, medical hygiene, leather, and other fields. Quartz tubes are particularly suitable for pharmaceutical and health, scientific research laboratories, environments that require no pollution, and corrosive heating environments containing acids and alkalis.