Inzitizi y'amazi ya barrière ya PTFE ifata kaseti igenwa cyane cyane nubusembwa (micropores, microcrack, fibre fibre) aho kuba hydrophobicity ya PTFE. Filime nziza ya PTFE itanga gusa WVTR yo hagati. Ibice byinshi byuzuzanya hamwe na lamellar yuzuza (mika, ibirahuri by'ibirahure) bitera labyrint, bigabanya cyane kwanduza imyuka. Kugirango ushireho ubuhehere bwinshi, vuga neza.

Kurwanya creep ya PTFE yubushyuhe bwo hejuru yubushyuhe munsi yumutwaro muremure uhoraho (cyane cyane kuri 200-260 ° C) bigenwa nimpamvu ebyiri: silicone PSA ihuza ubwinshi (guhuza kwinshi birinda gutemba) hamwe nubwoko bwa substrate (fiberglass-yongerewe imbaraga PTFE irwanya ubukonje bukonje; Ibifunga bidafunze birananirana vuba mubushyuhe bwinshi. Gufata neza cyane byongera ibyago byo kunyerera.

Kuri kaseti ya PTFE yubushyuhe bwo hejuru ikoreshwa muburyo bwo gukuramo ibishishwa byoroheje, ibisanzwe bidafite inkoni hamwe nubushyuhe ntibihagije. Ibipimo byingenzi byo gutoranya: Gutakaza ibibyimba (<15 mg / 1000 cycle), byuzuye byuzuye bya PTFE (karubone / grafite / MoS₂), amakuru ya PV ntarengwa, imbaraga zubutaka (≥200 N / cm), hamwe nuburinganire bwubuso (Ra 0.2-0.4 μm). Kurinda impande zose hamwe no guhuza byuzuye nibyingenzi kuramba.

PTFE substrate isanzwe irwanya umunyu utera (kwinjiza amazi <0.01%). Nyamara, muri rusange imikorere ya kaseti iterwa nubwoko bufatika: silicone PSA ihanganira ibidukikije byo mu nyanja (ibizamini byo gutera umunyu 500-1000h,> kubika 80%); acrylic PSA birananirana. Kuvura neza neza, kubusa kubusa, no gufunga impande hamwe na silicone kashe ni ingenzi kubwizerwa bwigihe kirekire kurubuga rwa interineti.

PTFE fiberglass kaseti isaba ibyemezo bitatu byingenzi byumutekano: UL (umutekano wamashanyarazi numuriro), FDA (kubahiriza ibiryo), na ISO 9001: 2015 (gucunga neza). Kaseti yemewe itanga imikorere ihamye, igihe kirekire cya serivisi, nigiciro gito cya nyirubwite nubwo igiciro kiri hejuru. Buri gihe ugenzure ibyemezo bitaziguye hamwe ninzego zitanga.

PTFE yubushyuhe bwo hejuru ikoreshwa mubice bitatu byubuvuzi: kurinda ibikoresho byo kuboneza urubyaro (tray autoclave tray, gupakira ubushyuhe bwa kashe), kuvura ibikoresho byo hejuru (gutwika-friction nkeya, kubika amashanyarazi), hamwe nibikoresho byatewe (graft vasculaire, suture). Biocompatibilité igenzurwa hakoreshejwe ISO 10993, naho FDA 21 CFR 177.1550 ishyiraho umutekano wibikoresho fatizo.

PTFE yubushyuhe bwo hejuru ifite imbaraga zo kurwanya imirasire ya ionizing. Kuri 1 kGy gamma yerekanwe gusa, imbaraga zingana ziragabanuka kugeza ~ 25% byumwimerere. Irakwiriye gusa kubidukikije bikabije (ibiryo / sterisizione yubuvuzi <10 kGy). Ku nganda za kirimbuzi cyangwa icyogajuru, koresha polyimide cyangwa PEEK aho.

Kuri kaseti ya PTFE yubushyuhe bwo hejuru yibiza igihe kirekire, substrate ya PTFE ikomeza kuba inert ya chimique, ariko igipande gifatika nikintu kidakomeye. Amazi agabanya silicone PSA; amazi yumunyu yihutisha ruswa. Ku miti ikaze, fluorosilicone cyangwa perfluoropolyether yifata - cyangwa kaseti ya PTFE idafite imiti - irakenewe. Gutakaza imbaraga zigera kuri 40% nyuma yamasaha 48 mumazi.

PTFE yubushyuhe bwo hejuru bukoreshwa mubisabwa guhuza ibiryo bigomba kuguma mubipimo byubushyuhe bwasobanuwe: 60260 ° C kugirango ukoreshe ubudahwema, 00300 ° C kumpinga ngufi (iminota), kandi ntuzigera hejuru ya 327 ° C (kubora). Amabwiriza ya FDA na EU ntagaragaza igihe ntarengwa - igihe cyo guhura neza giterwa nubushyuhe kandi bigomba kugenzurwa nibizamini byimuka bigereranya ibihe bifatika.

Ubushyuhe bwikirahure (Tg) bwa silicone yumuvuduko ukabije ni -120 ° C - munsi cyane ugereranije na acrylic. Iyi ultra-low Tg ituma PTFE yubushyuhe bwo hejuru ya kaseti ihindagurika kandi ikomera ndetse no kuri -70 ° C, ikarinda gucika intege kandi igafasha kwizerwa mubikorwa bya cryogenic.