PPR aluminium-yas composite yeeb nkab yog abbreviated li txhuas-yas yeeb nkab. Nws siv polyethylene los yog cross-linked polyethylene ua cov txheej sab hauv thiab sab nrauv, thiab cov yeeb nkab welded aluminium yog sandwiched ntawm nruab nrab txheej txheej. Sab hauv thiab sab nrauv ntawm cov yeeb nkab aluminium yog coated nrog cov nplaum thiab khi rau cov txheej yas. Cov raj tsim los ntawm ib qho kev txhaj tshuaj ib zaug lossis ob txoj kev txhaj tshuaj sib xyaw. Txij li xyoo 1992, qhov nruab nrab txhua xyoo kev loj hlob ntawm txhuas-yas kav hauv Europe tau tshaj 20 feem pua. Piv rau lwm cov kav dej siv hauv cov kav dej, nws txoj kev loj hlob yog siab tshaj.
