What tubing material is unsatisfactory for high temperatures?

In the context of tubing materials and their performance at high temperatures, copper is generally recognized as a suitable material because it has a relatively high melting point and maintains its strength at elevated temperatures. Stainless steel, known for its corrosion resistance and high-temperature strength, is also an excellent choice for applications involving heat.

On the other hand, plastic and PVC (polyvinyl chloride) are significantly less suited for high-temperature applications. Plastics can begin to deform or melt at temperatures that are achievable in many industrial and engineering environments, leading to potential failure in systems that operate under such conditions. PVC, in particular, has a lower temperature tolerance compared to metals and can become brittle or lose its structural integrity when exposed to heat.

Thus, while copper is indeed suitable for high temperatures, the materials that typically are unsatisfactory for high temperature applications are plastic and PVC, making it essential to select materials based on their thermal properties for specific engineering applications.