Thread seal tape introduction
Thread sealing tape (also referred to as PTFE tape or plumber’s tape) is a polytetrafluoroethylene (PTFE) membrane for use in sealing pipe threads. Videotapes sold down to a specific width and wound on the spool, so it is easy Pipe threads. It is also known by the generic trade name Teflon tape; and Teflon is virtually identical to PTFE, DuPont (trade mark owner) consider such use is not correct, particularly when they are no longer on tape forms manufacture Teflon.  thread seal tape lubrication allows deeper thread seat, and it helps prevent the threads are unscrewed stuck.  The tape can also be used as a filler and a deformable thread lubricant to help seal without hardening or make it more difficult to tighten the joint, , but make it easier to tighten. 
Normally, pipe thread tape wrapped three times before it is screwed into place. It is typically used to apply commercial purposes, including pressurized water system, central heating and air compression equipment.