Thread seal tape, commonly known as Teflon tape or PTFE tape, is made of polytetrafluoroethylene (PTFE). PTFE is a high-performance synthetic fluoropolymer of tetrafluoroethylene, and it is well-known for its non-stick properties, chemical resistance, and high-temperature tolerance.

The tape is typically a thin, white, or sometimes colored strip that is used in plumbing applications for creating a seal between threaded pipe joints. The PTFE material provides a lubricating effect that allows for easier assembly of threaded connections while also serving as a sealant to prevent leaks.

In addition to its use in plumbing, thread seal tape is also employed in various industrial applications where a non-reactive, durable, and heat-resistant seal is required. The use of PTFE ensures that the tape can withstand a wide range of temperatures and resist chemical reactions, making it a reliable choice for sealing threaded connections in various settings.