PTFE high-zazzabi tef shafi zafi-sealing wukake da sealing tube isar hudu core dabi'u: hana narkakkar roba manne (kau da downtime), kare tsada sealing mutu, homogenizes zafi / matsa lamba ga m hatimi, da kuma rage fim gogayya. Tef mai goyan bayan fiberglass (0.13-0.25 mm) tare da silicone PSA (≥260°C) ana bada shawarar. Anti-a tsaye baƙar tef don manyan layukan sauri.

The ruwa tururi shãmaki dukiya na PTFE m tef an ƙaddara da farko ta shafi lahani (micropores, microcracks, fiber wicking) maimakon PTFE ta intrinsic hydrophobicity. Fim ɗin PTFE mai tsabta yana ba da matsakaicin WVTR kawai. Multi-Layer shafi da lamellar fillers (mica, gilashin flakes) haifar da labyrinth sakamako, da matuƙar rage tururi watsa. Don babban hatimin hatimi, ƙididdige riguna masu yawa.

Crep juriya na PTFE high-zazzabi m tef a karkashin dogon lokaci m load (musamman a 200-260 ° C) an ƙaddara da abubuwa biyu: silicone PSA crosslink yawa (mafi girma crosslinking hana kwarara) da kuma substrate irin (fiberglass-ƙarfafa PTFE tsayayya sanyi creep; tsarki PTFE film cree). Manne wanda ba a haɗa shi ba yana kasawa da sauri a babban zafi. Yadudduka masu kauri suna ƙara haɗarin haɗari.

Don tef ɗin zafi mai zafi na PTFE da aka yi amfani da shi a aikace-aikacen gogayya mai zamewa abrasive, daidaitaccen rashin sanda da juriya mai zafi bai isa ba. Mahimman zaɓi na zaɓi: Taber abrasion asarar (<15 mg / 1000 cycles), cike da gyaran fuska na PTFE (carbon/graphite/MoS₂), bayanan iyaka na PV, ƙarfin substrate (≥200 N / cm), da mating surface roughness (Ra 0.2-0.4 μm). Kariyar gefen da ta dace da cikakken haɗin kai suna da mahimmanci don tsawon rai.

Matsakaicin PTFE a zahiri yana da juriya na feshi gishiri (shar ruwa <0.01%). Koyaya, aikin tef ɗin gabaɗaya ya dogara da nau'in mannewa: silicone PSA yana jure yanayin yanayin ruwa (gwajin feshin gishiri 500-1000h,> 80% riƙe kwasfa); acrylic PSA ya kasa. Maganin saman da ya dace, aikace-aikacen kumfa, da rufe baki tare da silin siliki suna da mahimmanci don dogaro na dogon lokaci akan dandamali da tasoshin ruwa.

Tef ɗin fiberglass na PTFE yana buƙatar takaddun shaida na aminci guda uku: UL (lantarki da lafiyar harshen wuta), FDA (cirewar hulɗar abinci), da ISO 9001: 2015 (Gudanar da inganci). Taffofin ƙwararrun kaset suna ba da daidaiton aiki, rayuwar sabis mai tsayi, da ƙarancin ƙimar ikon mallaka duk da ƙarin farashi na gaba. Koyaushe tabbatar da takaddun shaida kai tsaye tare da ƙungiyoyi masu bayarwa.

PTFE high-zazzabi tef ake amfani a fadin uku likita aikace-aikace tiers: haifuwa kayan aiki kariya (autoclave trays, zafi-hatimin marufi), kayan aiki surface jiyya (ƙananan gogayya shafi, lantarki rufi), da implantable na'urorin (vascular grafts, sutures). An tabbatar da daidaituwar halittu ta hanyar ISO 10993, kuma FDA 21 CFR 177.1550 ta kafa amincin kayan aiki.

PTFE babban tef ɗin zafi yana da ƙarancin juriya ga ionizing radiation. A kawai 1 kGy bayyanar gamma, ƙarfin ɗaure ya ragu zuwa ~ 25% na asali. Ya dace kawai don ƙananan yanayi (abinci / haifuwa na likita <10 kGy). Don masana'antar nukiliya ko jirgin sama, yi amfani da polyimide ko PEEK maimakon.

Don kaset ɗin zafi mai zafi na PTFE a ƙarƙashin nutsewar dogon lokaci, PTFE substrate ɗin ya kasance marar amfani da sinadarai, amma manne Layer shine wurin rauni. Ruwa yana raunana PSA silicone; ruwan gishiri yana hanzarta lalata. Don sinadarai masu haɗari, ana buƙatar fluorosilicone ko perfluoropolyether adhesives - ko tef ɗin PTFE mara mannewa - ana buƙata. Ƙarfin kwasfa har zuwa 40% bayan sa'o'i 48 a cikin ruwa.

PTFE babban tef ɗin da aka yi amfani da shi a aikace-aikacen hulɗar abinci dole ne ya kasance cikin ƙayyadaddun iyakokin zafin jiki: ≤260°C don ci gaba da amfani, ≤300°C na gajerun kololuwa (mintuna), kuma ba zai taɓa sama da 327°C (ruɓewa ba). Dokokin FDA da EU ba su fayyace ƙayyadaddun lokaci na duniya ba - amintaccen lokacin tuntuɓar ya dogara da zafin jiki kuma dole ne a tabbatar da shi ta gwajin ƙaura da ke kwaikwaya ainihin yanayi.