A Complete Guide to PTFE Tape
Thread sealing for pipework
PTFE Tape Guide
PTFE tape is also known as thread tape, plumber tape and teflon tape and it is used as a lubricating material and thread sealant. PTFE tape is primarily used in piping applications and for sealing threaded joints for both water and gas piping. The full chemical name is polytetrafluoroethylene tape and it is usually sold in precut rolls in various thicknesses.
For gas connections it is common to use gas tape or pipe tape for gas to support reliable sealing on threaded fittings. When applied correctly PTFE tape can help tape stop leak issues around threads by improving the seal and reducing friction during tightening.
Always follow job specifications and site requirements for gas installations and confirm compatibility with the fitting type.

What does PTFE tape do?
Seals threads and supports joint integrity
PTFE tape works by filling minor gaps between male and female threads which supports a tighter seal once the joint is tightened. It also reduces friction during assembly so the fitting can tighten more smoothly.
- Improves sealing on threaded joints for water lines
- Supports airtight connections where gas tape or pipe tape for gas is specified
- Helps reduce small seepage points that can appear around thread forms
- Reduces the risk of thread binding during tightening
Typical UK applications
PTFE tape is widely used across domestic plumbing, facilities maintenance and general pipework assembly. It is also common in workshops and industrial environments where threaded pipe fittings are used for fluids and gases.
If you need tape stop leak performance you will get the best results when the threads are clean, dry and undamaged.
PTFE tape colours and selection
Quick colour guide
PTFE tape is available in several colours which are often used to indicate typical use cases. Always confirm the correct tape type for your application and follow site requirements for gas installs.
| Colour | Typical use |
|---|---|
| White | Commonly used for water lines |
| Yellow | Used for gas lines including propane, butane and natural gas where specified |
| Green | Used for oxygen lines where grease free and non combustible requirements apply |
| Grey | Used for stainless steel fittings and helps reduce seizing and galling |
Reference images




For gas work use the correct gas tape or pipe tape for gas as required by the job specification.
How to apply PTFE tape
Step by step method
- Ensure both mating parts are clear of debris and are clean and dry
- Start the wrap by placing the end of the tape onto the second thread from the end
- Wrap in the direction the fitting will tighten and keep tension as you apply it
- Wrap 2 to 4 times and use 4 to 5 wraps for thinner tape where needed
- Break the tape and tuck the loose end to keep the wrap neat and reduce unravelling
Common mistakes to avoid
- Wrapping the tape in the wrong direction which can cause it to unwind
- Over wrapping which can stop the joint tightening correctly
- Applying tape over dirt and old material which reduces sealing performance
- Reusing old tape after unthreading which can reduce tape stop leak effectiveness
PTFE tape does not use adhesive so tension and correct wrap direction keep it in place until the joint is tightened.
PTFE tape properties
If you are selecting tape for gas connections use the correct gas tape or pipe tape for gas as required. For best tape stop leak results ensure threads are clean and the joint can tighten fully.
Frequently asked questions
Browse PTFE tape options
View our PTFE tape range including options suitable for water pipework and specified gas installations.
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