PPR kav dej feem ntau yog ua los ntawm copolymerized polypropylene, yog li cov kav dej PPR tseem hu ua peb hom polypropylene kav, thaum PVC kav yog ua los ntawm cov ntaub ntawv polyvinyl chloride. Vim qhov sib txawv ntawm cov khoom siv tseem ceeb, ob lub kav dej muaj cov yam ntxwv sib txawv. Nws yog qhov tseeb vim yog cov khoom siv raw uas PPR kav feem ntau yog kub yaj, thiab cov kav dej PVC feem ntau yog nplaum. Lub ppr raj muab faib ua plaub-point raj thiab rau-point raj raws li phab ntsa thickness. Phab ntsa thickness ntawm plaub-point raj yog 2.3 hli, thiab phab ntsa thickness ntawm lub rau-point raj yog 3.5 hli. Phab ntsa tuab ntawm cov yeeb nkab pvc yog 2.0mm. Vim qhov txawv phab ntsa thickness, tus nqi ntawm cov yeeb nkab kuj yuav txawv. Tsis tas li, cov nqi sib txawv ntawm qhov chaw mus rau qhov chaw. Cov yeeb nkab dej siv PPR yeeb nkab, uas tau muab faib ua cov yeeb nkab dej txias thiab cov yeeb nkab dej kub. Cov kav dej PVC yog tsim rau cov xaim hla ntawm phab ntsa thiab cov kav dej phwj tuaj.
