PP-R Aluminum steady plastic pipeline expansion coefficient is ordinary PP-R pipe 1/5 (ordinary PP-R pipe is 0.15 mm / m K), close to the metal pipe, pipe no significant thermal expansion and contraction. When engineering, installation, piping for surface mounted horizontally for less than 40 meters in length, without regard to the pipeline deformation; for horizontal installation length of more than 40 meters for surface piping, technical measures should be considered to prevent pipe temperature deformation; riser for adoption rigid mounting. In the high-temperature hot water, HVAC field, outdoor surface mounted pipeline applications have obvious advantages. Practice has proved that: PP-R Aluminum steady plastic tube through after prolonged thermal cycling test, the pipe without any distortion or strange phenomenon, the full description PP-R Aluminum steady plastic tube with a stable temperature performance.