tsis kam, nyuaj rau ntsuas, thiab lub sijhawm ua haujlwm ntev, tab sis kuj tseem muaj lwm cov yam ntxwv tseem ceeb xws li:
1. Kev teeb tsa yooj yim, tsuas yog txuas. PPR kuj muaj qhov ua haujlwm zoo heev. Cov kav dej thiab cov khoom siv tuaj yeem txuas tau los ntawm kub yaj thiab electrofusion, thiab lub zog ntawm nws qhov txuas txuas yog ntau dua li nws tus kheej tawv.
2, PPR cov ntaub ntawv tseem tuaj yeem siv tau.
3. Nws siv sijhawm ntev. PPR raj tuaj yeem siv tsawg kawg 50 xyoo ntawm qhov kub ua haujlwm 70 ° C thiab ua haujlwm siab (PN) ntawm 1.OMPa; nws tuaj yeem siv tsawg kawg 100 xyoo ntawm qhov kub ntawm 20 ° C.
4. Ntxuav, tsis muaj mob thiab tu cev. Cov khoom siv raw khoom ntawm PPR tsuas yog muaj cov pa roj carbon thiab hydrogen, thiab tsis muaj cov tshuaj phem thiab lom nyob hauv. Nws tuaj yeem siv rau hauv cov kav dej txias thiab dej kub thiab cov dej haus huv.
5. Cov khoom siv no tuaj yeem khaws cia kom sov thiab txuag hluav taws xob. Cov thermal conductivity ntawm PPR yeeb nkab yog 0.21w/mk, uas yog kwv yees li 1/200 ntawm cov yeeb nkab hlau.
6. Cov cua sov zoo heev. Lub Vicat softening point ntawm PPR raj yog 131.5 ° C. Qhov ua haujlwm siab tshaj plaws tuaj yeem ncav cuag 95 ℃, uas tuaj yeem ncav cuag tus txheej txheem dej kub hauv lub tsev tsim cov dej thiab cov cai tso dej.