Piv nrog rau qhov hloov dua siab tshiab YD/T 760-1995 tus qauv, YD/T 760-2023 tus qauv qhia txog ntau qhov kev hloov kho tseem ceeb: cov khoom siv tau nthuav dav los ntawm "sab hauv tsev cables" mus rau "txhua qhov kev sib txuas lus cables"; cov txheej txheem kev faib tawm tau loj hlob los ntawm plaub pawg ntawm cov ntaub ntawv nruab nrab ntom ntom kom suav nrog rau 6 pawg ntawm cov khoom siv rau lub cev lossis tshuaj lom neeg foamed; thiab cov kev qhia tshwj xeeb tau nce los ntawm 12 mus rau 19 qhov kev xeem yuav tsum tau ua.
Tus txheej txheem categorizes cov ntaub ntawv rwb thaiv tsev rau hauv ob hom kev tshaj lij: cov khoom siv rwb thaiv tsev thiab cov ntaub ntawv rwb thaiv tsev foamed. Cov khoom siv rwb thaiv tsev muaj xws li plaub lub hauv paus khoom siv: LDPE, LLDPE, HDPE, thiab PP. Foamed rwb thaiv tsev cov ntaub ntawv yog ntxiv subdivided raws li cov txheej txheem foaming rau hauv lub cev foaming thiab tshuaj foaming pawg.
Hais txog qhov tseem ceeb ntawm cov ntsuas kev ua tau zoo, qhov kev xav tau ntawm qhov ntim yog siab dua lossis sib npaug rau 1 × 10¹⁵ Ω·m rau cov khoom siv rwb thaiv tsev thiab Ntau dua lossis sib npaug rau 1 × 10¹⁴ Ω·m rau cov ntaub ntawv rwb thaiv tsev foamed. Qhov yuav tsum tau rau oxidation induction lub sij hawm yog ntau tshaj los yog sib npaug rau 30 feeb rau cov khoom siv rwb thaiv tsev thiab Ntau tshaj los yog sib npaug rau 20 feeb rau foamed rwb thaiv tsev cov ntaub ntawv. Foamed rwb thaiv tsev cov ntaub ntawv kuj muaj ib tug yuav tsum tau rau lub℃ntawm foaming, teev nyob rau hauv lub 40-60% ntau.
HDPE/P-cov ntaub ntawv hom, tus yam ntxwv los ntawm ib tug dielectric tas li ntawm Less tshaj los yog sib npaug zos rau 1.55, yog dav siv nyob rau hauv lub tsim ntawm leaky cables rau 5G hauv paus chaw nres tsheb. Nyob rau hauv cov ntaub ntawv chaw cabling systems, PP/F- hom chemically foamed polypropylene cov ntaub ntawv muaj qhov zoo xws li foaming℃stability nyob rau hauv ± 2%, tsis kam rau thermal stress cracking rau ntau tshaj los yog sib npaug rau 96 teev, thiab zoo heev compatibility nrog sau tebchaw.
Nyob rau hauv cov nqe lus ntawm kev tswj kom zoo, lub melt flow rate test yuav tsum nruj sib txawv ntawm qhov ntsuas kub rau polyethylene thiab polypropylene. Rau cov ntaub ntawv foamed, qhov kev faib ua feem ntawm unfoamed granules yuav tsum tau saib xyuas thiab khaws cia ntawm tsawg dua los yog sib npaug li 3%. Kev sim rau cov tshuaj txwv tsis pub yuav tsum npog rau 6 pawg ntawm cov hlau hnyav (xws li txhuas thiab cadmium) thiab plaub hom phthalates.
