In general, different heating tube materials are suitable for different temperature ranges. But from the kitchen utensils of the oven, all three are possible because they belong to the low temperature category (below 800 degrees Celsius). Choose a low price. The more uniform the heating of the tube shape from the shape, the M type is better than the U line, and the straight tube is worse. At present, carbon fiber heating tubes are widely used in home appliances. Because of their wavelengths of 4-18 microns, they are easily absorbed by the human body, so they are used in heaters. The oven often roasts, and the absorption wavelength of the meat is also 4-18 microns. Therefore, the oven heating tube is mostly made of carbon fiber heating tube.