Tef ɗin hatimi

Tef ɗin hatimi (kuma aka sani da tef ɗin PTFE ko tef ɗin plumber) fim ne na polytetrafluoroethylene (PTFE) don amfani da zaren bututu. Ana sayar da tef ɗin a yanke zuwa takamaiman nisa kuma a raunata a kan spool, yana sauƙaƙa iska a kusa da zaren bututu. Hakanan an san shi da ƙayyadaddun sunan kasuwancin Teflon tef; yayin da Teflon ya kasance daidai da PTFE, Chemours (masu alamar kasuwanci) sunyi la'akari da wannan amfani ba daidai ba ne, musamman ma yadda suke daina kera Teflon a cikin nau'in tef. Zaren daga kamawa lokacin da ba a kwance ba.Tape ɗin kuma yana aiki azaman filler mai naƙasasshe da mai mai mai zare, yana taimakawa rufe haɗin gwiwa ba tare da taurare ko yin wahalar datsewa ba, kuma a maimakon haka yana sauƙaƙa da ƙarfi.

Yawanci ana nannade tef ɗin a zaren bututu sau uku kafin a murɗe shi. Ana amfani da ita ta kasuwanci da yawa a aikace-aikace ciki har da tsarin ruwa mai matsa lamba, tsarin dumama na tsakiya, da kayan aikin matsawa iska.

Nau'ukan

Ana sayar da tef ɗin hatimin zaren a cikin ƙananan spools.
Akwai ma'aunin Amurka guda biyu don tantance ingancin kowane tef ɗin PTFE. MIL-T-27730A (ƙayyadaddun ƙayyadaddun soja wanda har yanzu ake amfani da shi a masana'antu a Amurka) yana buƙatar ƙaramin kauri na mil 3.5 da ƙaramin tsaftar PTFE na 99%. Matsayi na biyu, AA-58092, shine darajar kasuwanci wanda ke kula da buƙatun kauri na MIL-T-27730A kuma yana ƙara ƙaramin ƙima na 1.2 g/cm3. Matsayi masu dacewa na iya bambanta tsakanin masana'antu; tef don kayan aikin gas (zuwa dokokin iskar gas na Burtaniya) ana buƙatar ya zama mai kauri fiye da na ruwa. Kodayake PTFE kanta ya dace don amfani da iskar oxygen mai ƙarfi, ƙimar tef ɗin kuma dole ne a san cewa ba ta da maiko.

Tef ɗin hatimin zaren da ake amfani da shi a aikace-aikacen famfo ya fi fari, amma kuma ana samunsa da launuka daban-daban. Ana amfani dashi sau da yawa don dacewa da bututun masu launi (US, Kanada, Australia da New Zealand: rawaya don iskar gas, kore don oxygen, da sauransu). Bill Bentley na Unasco Pty Ltd ne ya gabatar da waɗannan lambobin-launi don tef ɗin rufe zaren a cikin 1970s. A Burtaniya, ana amfani da tef daga reels masu launi, misali rawaya reels don gas, kore don ruwan sha.

Farin - ana amfani dashi akan zaren NPT har zuwa 3/8 inch
Yellow - ana amfani da shi akan zaren NPT 1/2 inch zuwa 2 inch, galibi ana yiwa lakabin "tef ɗin gas"
Pink - ana amfani da shi akan zaren NPT 1/2 inch zuwa 2 inch, mai lafiya don propane da sauran makamashin hydrocarbon
Green – PTFE mara mai da ake amfani da shi akan layin oxygen da wasu takamaiman gasses na likita
Grey – ya ƙunshi nickel, anti-seizing, anti-gailling da anti-lalata, da ake amfani da su bakin bututu.
Copper - yana ƙunshe da granules na jan karfe kuma an tabbatar da shi azaman mai mai mai zare amma ba mai rufewa ba
A cikin Turai ma'aunin BSI BS-7786:2006 yana ƙayyadaddun maki daban-daban da ƙimar ingancin tef ɗin zaren PTFE.