... raw material,good quality, good looking “Seher” PP-R aluminum-plastic composite pipe consists 5 layers, in the ... is aluminum, outer layer is PP-R, inner layer is PE or PP-R, between the layers is imported hot ... resistance, no fouling and long service life etc.PP-R Aluminum-plastic composite pipe is widely used in pipe ... metal and plastic pipes.specification:20~75mm PP-R Aluminum plastic composite pipe