Which material is not suitable for use in propane piping?

The use of copper tubing is indeed common in certain applications, but it is not suitable for use in propane piping due to its potential for compatibility issues with propane. Specifically, copper can react with some additives in propane, which may lead to corrosion over time. In addition, the high pressures associated with propane can lead to the risk of leaks when using copper fittings and joints, making it an unsuitable choice for propane systems.

On the other hand, materials like steel and galvanized pipe are suitable for propane use because they provide strong structural integrity and do not react adversely with propane. PVC, although not commonly used for transporting propane, is explicitly unsuitable because it cannot withstand the high pressures associated with gas systems and may degrade in the presence of propane.

Understanding the specific characteristics and chemical compatibilities of materials is crucial for ensuring safety and reliability in propane piping systems.