As an expert in materials science with a focus on polymers, I'm well-versed in the properties and applications of various materials, including Teflon tape. Teflon, which is a brand name for Polytetrafluoroethylene (PTFE), is a versatile plastic known for its non-stick properties, chemical resistance, and high-temperature tolerance.

Temperature Range: PTFE has an impressive temperature range that it can withstand. It is stable up to +500°F (or +260°C), which is a critical temperature point for PTFE. Beyond this temperature, the material begins to decompose slowly. However, it's important to note that the decomposition process is gradual and does not mean the material will fail immediately. In fact, PTFE can still function at temperatures up to 750°F (or 400°C), although it will start to break down more rapidly at this point.

Decomposition and Flammability: While PTFE is known for its stability, it is not completely immune to decomposition. When exposed to open flames or extremely high temperatures, PTFE can decompose. This is a chemical process where the material breaks down into its constituent parts. However, it's worth mentioning that PTFE does not support combustion and is considered self-extinguishing, meaning it will stop burning once the source of heat is removed.

Application in Fittings: When it comes to using Teflon tape for sealing threaded pipe fittings, it's crucial to select the appropriate width of tape for the size of the fitting. For fittings up to 2" (51mm) in diameter, a 3/4" (19mm) wide tape is recommended. This ensures that the tape provides a sufficient seal without being too thick or too thin, which could compromise the integrity of the seal.

Safety and Precautions: Despite its high-temperature tolerance, it's always important to exercise caution when working with materials that can withstand such temperatures. Always follow the manufacturer's guidelines for use, and ensure that any tools or equipment used in conjunction with Teflon tape are also rated for the temperatures involved.

In summary, Teflon tape, made from PTFE, is a reliable material for high-temperature applications, with a stable range up to +500°F (or +260°C). It can slowly decompose at temperatures up to 750°F (or 400°C), and while it will decompose on contact with naked flames, it does not support combustion. When using Teflon tape for fittings, the correct width of tape should be chosen based on the diameter of the fitting to ensure a proper seal.

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Temperature Range: -450--F to +500--F (-268--C to +260--C) PTFE is completely stable up to +500o F or +260--C. Decomposition is slow up to 750--F or 400--C. Although decomposition will occur on contact with naked flames. Use 3/4" (19mm) wide tape for fittings up to 2" (51mm) in diameter.read more >>