Non-metallic compensators are composed of flexible compensators, flanges or nozzles, thermal insulation materials and bolt ties, which can provide large axial, angular and lateral displacements within a small size range. The main material is glass fiber fabric and its coated products, and the transmission is weak. The use of nonmetallic compensators simplifies the design, avoids the use of large brackets, and saves a lot of material and labor. In turn, it plays the role of sound absorption and shock absorption (fiber fabric and thermal insulation cotton itself have the function of sound absorption and shock absorption, which can effectively reduce the noise and vibration of boiler, fan and other systems). At the same time has the excellent high temperature resistance, corrosion resistance and sealing performance, using organic silicon, fluorine and other polymer material coating treatment, has the excellent high temperature resistance, corrosion resistance and sealing performance. Easy to install and maintain.