Non metallic expansion joints can compensate for multiple directions, with a large compensation amount. They have the characteristics of no thrust, simplified support design, high temperature resistance, noise reduction, etc., and are suitable for hot air ducts and smoke ducts.

There are several types of non-metallic expansion joints, including rectangular, circular, square, sky round, and earth round. They are composed of non-metallic expansion joint skin (ring belt), metal frame, transport rod, and other components. The main material is made of alkali free glass fiber cloth, coated silicone rubber cloth, coated fluororubber cloth, aluminum silicate fiber cotton, etc., which can compensate for the vibration and pipeline displacement caused by the operation of fans and ducts.

The working body that constitutes the non-metallic expansion joint - the non-metallic expansion joint skin (band) is made of non-metallic material, usually fiber fabric, so the non-metallic expansion joint is also known as fiber fabric compensator or fabric expansion joint.