PolytetrafluoroethylenePTFE (Teflon lossis PTFE), feem ntau hu ua "yas vaj ntxwv", yog ib qho polymer compound ua los ntawm tetrafluoroethylene los ntawm polymerization, nrog kev ruaj khov tshuaj zoo heev, tiv taus corrosion, sealing, siab lubrication tsis-viscosity, hluav taws xob rwb thaiv tsev thiab zoo tiv thaiv kev laus.

PTFE yooj yim rau dej txias thiab nkag mus rau hauv qab siab thiab kub siab, yog li nws feem ntau siv rau qhov siab qis, kub nruab nrab, xeb muaj zog thiab tsis pub muaj kuab paug rau cov khoom nruab nrab, xws li cov kua qaub muaj zog, alkali, halogen, tshuaj thiab lwm yam. Qhov kub ua haujlwm zoo yog 150 ℃ thiab qhov siab qis dua 1MPa. Lub zog PTFE uas tau ntim yuav nce ntxiv, tab sis qhov kub siv tsis tuaj yeem tshaj 200 ℃, txwv tsis pub qhov kev tiv thaiv xeb yuav txo qis. Qhov siab siv siab tshaj plaws ntawm PTFE ntim feem ntau tsis ntau tshaj 2MPa.

Vim yog qhov kub nce ntxiv, cov khoom siv yuav nkag mus, ua rau lub zog ntawm lub foob txo qis. Txawm tias qhov kub tsim nyog, nrog rau lub sijhawm ntev, qhov kev ntxhov siab ntawm qhov chaw sib khi yuav txo qis, ua rau "kev ntxhov siab so". Qhov xwm txheej no yuav tshwm sim hauv txhua hom gaskets, tab sis kev ntxhov siab so ntawm PTFE pad yog qhov loj dua, thiab yuav tsum ceev faj.

Tus coefficient ntawm PTFE yog me me (kev ntxhov siab compression yog ntau dua 4MPa, tus coefficient ntawm kev sib txhuam yog 0.035 ~ 0.04), thiab lub gasket yooj yim rau kev plam sab nraud thaum ua ntej zawm, yog li nws yog qhov zoo tshaj plaws los siv qhov concave thiab convex flange nto. Yog tias siv lub flange tiaj tus, lub cheeb sab nraud ntawm lub gasket tuaj yeem tiv tauj nrog lub bolt kom tiv thaiv lub gasket los ntawm kev swb sab nraud.

Vim tias cov khoom siv iav txheej yog sintered tom qab txau ib txheej ntawm enamel rau ntawm qhov chaw hlau, cov txheej glaze yog brittle heev, ua ke nrog kev txau tsis sib xws thiab cov txheej glaze ntws, qhov chaw tiaj tus ntawm lub flange tsis zoo. Cov hlau sib xyaw gasket yog yooj yim ua puas rau cov txheej glaze, yog li nws raug pom zoo kom siv cov khoom siv tseem ceeb ua los ntawm asbestos board thiab roj hmab PTFE packing. Cov ntim khoom yog yooj yim kom haum nrog qhov chaw flange thiab tiv taus corrosion, thiab cov nyhuv siv yog zoo.

Muaj ntau lub Hoobkas nyob rau hauv qhov kub thiab txias, siab tsis siab nyob rau hauv lub zog corrosive nruab nrab, kev siv cov roj hmab asbestos phaj qhwv PTFE raw khoom siv siv, rau feem ntau disassembled manholes, kav dej. Vim tias kev tsim khoom thiab kev siv yooj yim heev, nrov heev.