What material is the non-metal expansion joint made of?
Non-metallic expansion joints, also known as non-metallic compensators or fabric compensators, are composed of a combination of non-metallic materials to absorb displacement, vibration, and noise in piping systems. Its main materials include:
Fiber fabric: Usually use alkali-free glass fiber cloth, high silicon oxide polytetrafluoroethylene (PTFE) cloth, silicone gel cloth, etc. These fabrics have good flexibility, temperature resistance and corrosion resistance.
RubberSome non-metallic expansion joints use rubber materials, especially in environments requiring high elasticity and chemical resistance.
High temperature resistant material: Such as aluminum silicate wool, ceramic fiber, etc. These materials can withstand high temperature environment, suitable for hot air duct and smoke duct.
Sealing material: Includes silicone rubber, tetrafluorine cloth (PTFE), and other high-performance sealing composites for improving the sealing and durability of expansion joints.
Thermal insulation material: Thermal insulation is also sometimes added to reduce heat loss or to prevent the influence of external heat.
The skin (main expansion body) of non-metallic expansion joint is usually composed of multilayer composite materials, such as silicone rubber or PTFE and alkali-free glass silk foam multilayer composite. This structure can effectively absorb the expansion amount, prevent air leakage and rainwater leakage, and also have good electrical insulation and anticorrosion properties.
The characteristics of non-metallic expansion joints are that they can compensate for axial, transverse and angular displacements, simplify the design of bearings, and reduce noise and vibration. They are especially suitable for use in pipeline systems that require high temperature resistance, corrosion resistance and low stiffness characteristics. For example, in electric power, chemical industry, cement, energy and other fields, non-metallic expansion joints are widely used.