There are two primary types of expansion joints-metal and non-metallic or elastomeric. Metal expansion joints are constructed in a bellows configuration from thin-gauge material designed to absorb mechanical and thermal movement. Elastomeric expansion joints, by contrast, are fabricated from natural or synthetic rubber and fabric. Consisting of an inner elastomeric tube fused to a metal-reinforced fabric body and an elastomeric cover, these types of expansion joints accommodate greater pipe movement and provide more abrasion resistance than metal joints.
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Recently, 30 Dongfeng style natural gas buses produced by Dongfeng Commercial Vehicle Co., Ltd.'s Dongfeng Bus Co., Ltd. went to Huxian, Shaanxi and were delivered to the county transport company.
According to reports, these new Dongfeng style energy-saving environmental protection bus is a new type of CNG clean energy vehicle, the appearance of elegant atmosphere, green environmental protection, with outstanding quality and lower gas consumption has won the favor of users. After the 30 Dongfeng style natural gas buses were put into counties and counties, they will further increase the local bus transportation capacity, improve the conditions for people to travel, and become a beautiful landscape on Huxian bus lines. 
Expansion joints reduce vibration, dampen sound, and accommodate movement in piping systems.