PPR cev

PP-R yeeb nkab tseem hu ua peb- hom polypropylene yeeb nkab. Nws siv random copolymerized polypropylene extruded rau hauv cov kav dej thiab txhaj molded los ua yeeb nkab fittings. Nws yog ib yam tshiab ntawm cov yeeb nkab yas khoom tsim thiab siv nyob rau hauv cov teb chaws Europe thaum ntxov 1990s. Thaum xyoo 1980s lig, PP-R tau siv cov txheej txheem roj copolymerization los ntawm randomly thiab uniformly polymerize li 5 feem pua ​​​​PE nyob rau hauv cov saw molecular ntawm PP (random copolymerization) los ua ib tiam tshiab ntawm cov khoom siv kav dej. Nws muaj kev cuam tshuam zoo thiab ntev - lub sij hawm creep zog.