Thread seal tape (also known as PTFE tape
or plumber’s tape) is a polytetrafluoroethylene (PTFE) film for use in sealing pipe threads. The tape is sold cut to specific widths and wound on a spool, making it easy to wind around pipe threads. It is also known by the genericised trade-name Teflon tape; while Teflon is in fact identical to PTFE, Chemours (the trade-mark holders) consider this usage incorrect, especially as they no longer manufacture Teflon in tape form.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.
PTFE is widely used in a variety of needs, such as: anti-acid and organic solvents, which itself has no toxic to people, but one of the raw materials used in the production process of ammonium perfluorooctanoate (PFOA) is considered likely to have a carcinogenic effect.
Large relative molecular of PTFE, the lower one as hundreds of thousands, while higher one can up to one million or more (degree of polymerization of 104 orders of magnitude, while the polyethylene only 103). Degree of crystallinity is generally 90 to 95%, a melting temperature of 327 ~ 342 ℃. Molecule CF2 unit in PTFE arrange by zigzag shape, because the fluorine atom radius
larger than the hydrogen, so the adjacent CF2 units can not cross exactly trans orientation, but form a spiral twisted chain, fluorine atom
covering almost the entire polymer chain surface
. This molecular structure explains various properties of PTFE. At temperatures below than 19 ℃ to form 13/6 helix; phase transition at 19 ℃, slightly unravel the molecular to form 15/7 helix.
Though the perfluorocarbon carbon – carbon bond and carbon – fluorine bonds are broken need to absorb energy 346.94 and 484.88kJ/mol, but PTFE depolymerization energy generate 1mol tetrafluoroethylene only need 171.38kJ. So in the pyrolysis, PTFE mainly depolymerizate tetrafluoroethylene. PTFE at 260,370 and 420 ℃ the weight loss rate (%) were 1×10-4, 4×10-3 and 9×10-2 per hour.
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Range of final PTFE thread seal tape:
Thickness: 0.05-0.3mm or more (according your requirement);
Width: 8mm, 10mm, 12mm, 19mm, 25mm or others, according to your requirement;
Length: 8m, 10m, 12m, 15m, 18m, 20m ,25m, 40, etc..according to your requirement.