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This Teflon tape is white and is 10mt. It is commonly used in plumbing practices to seal small threads in water lines.
Thread seal tape (commonly known Teflon or PTFE tape) is a polytetrafluoroethylene film tape commonly used in plumbing for sealing pipe threads.
The tape is available in specific widths and wound on a spool, making it easy to wind around pipe threads.
Thread seal tape lubricates allowing for a deeper seating of the threads, and it helps prevent the threads from seizing when being unscrewed.
The tape also works as a deformable filler and thread lubricant, helping to seal the joint without hardening or making it more difficult to tighten, and instead making it easier to tighten.
Thread seal tape used in plumbing applications is most commonly white, but it is also available in various colours.
It is often used to correspond to colour coded pipelines
White: used on threads used in water lines.
Pink: also used on threads in water lines. This is thicker and preferred by many for pipework 15mm and above
Yellow: used on threads 1/2 inch to 2 inch for gas application
Green: oil-free PTFE used on oxygen lines and some specific medical gasses
Gray: contains nickel, anti-seizing, anti-galling and anti-corrosion, used for stainless pipes
The BSI standard BS-7786:2006 specifies various grades and quality standards of PTFE thread sealing tape.
Thread seal tape is appropriate for use on tapered threads, where the sealing force is a wedge action.
parallel threads may not seal effectively with or without tape, as they are intended to be sealed by a gasket.
Thread seal tape is almost always applied by hand, although at least one machine is available for production wrapping of fittings.
Overuse or misapplication of thread seal tape may be a hazard.
Excess application of tape can prevent mating threads from fully engaging, reducing the shear point of the threads.
Combining thread seal tape with a pipe dope compound can also mechanical overload to threads.
Also, internal overhangs of loose material may constrict a joint or slough off and form a foreign body that could jam a valve seat.
Therefore, use of tape as a thread sealant is generally not considered appropriate in fluid power (hydraulic) systems, but correct application is required in all installs.
Use of names
Familiarity with the Teflon brand of fluoropolymers has led to the name becoming a generic trademark, and the practice of any PTFE-based thread seal tape being referred to as "Teflon tape".
Chemours, owner of the Teflon trademark, no longer manufactures any thread seal tape, but objects to this practice.