Different substances have different infrared absorption spectra, and have different absorption intensities for different wavelengths of infrared rays.

For example, metals and silicon wafers have strong absorption of short-wave infrared rays, while high molecular polymers, water, glass or organic solvents have a strong absorption of short-wave infrared rays. The absorption of wave-infrared rays is more significant.

According to different heated objects, reasonable selection of heating elements can meet production needs more efficiently.