Daim ntawv thov ntawm cov kav dej PERT hauv kev tsim cov kav dej kub thiab dej txias hauv kuv lub tebchaws tau tsim kho sai, thiab cov khoom siv raw kuj pom kev txhim kho ntxiv. Hauv xyoo 2002, tus qauv kev lag luam "Tshav kub-resistant Polyethylene (PE-RT) Piping Systems rau Cov Dej Kub thiab Txias" tau luam tawm. Txawm li cas los xij, lub sijhawm ntawd, tus qauv kev lag luam tau hais txog cov qauv German "Tshav kub-Resistant Polyethylene (PE-RT) Piping - General Quality Requirements" thiab "Heat-Resistant Polyethylene (PE-RT) Piping - Dimensions," ob qho tib si raws li qhov ntsuas kev ua tau zoo ntawm Hom I PE-RT. Nrog rau kev txhim kho cov ntaub ntawv, qhov ntsuas kev ua tau zoo ntawm Hom II PE-RT cov ntaub ntawv tam sim no tau zoo dua rau cov thawj tiam. Cov txheej txheem thoob ntiaj teb ISO 22391 "Tshav kub-Resistant Polyethylene (PE-RT) Piping Systems rau Cov Dej Kub thiab Dej Txias" kuj tau raug kho thiab hloov kho, ntxiv cov kev cai rau Hom II PE-RT kav.
Nrog rau kev tsim cov khoom siv, PE-RT kav tau hloov kho rau PE-RT Hom II kav, uas tau muab faib ua peb hom raws li lawv cov comonomers sib txawv:
1. Ethylene thiab octene copolymer - tshav kub-resistant polyethylene (C2+C8);
2. Ethylene thiab hexene copolymer - tshav kub-resistant polyethylene (C2+C6);
3. Ethylene thiab butene copolymer - tshav kub-resistant polyethylene (C2+C4)
Cov khoom tsim tawm tshiab (PE-RT Type II yeeb nkab) yog tsim rau kev lag luam thiab pej xeem cov kav dej kub thiab dej txias, cov kav dej haus, ua ntej -fab cua sov kav, pem teb radiant cua sov systems, thiab siab -kub av qhov chaw kub twj tso kua mis, tshwj xeeb tshaj yog nyob rau hauv sab qaum teb cheeb tsam uas nws yog siv nyob rau hauv lub thib ob yeeb nkab tes hauj lwm ntawm lub nroog cua sov PEB} hom II preformed {{3} ncaj qha - faus insulated kav.
