Which materials should never be used as a shield during torch operations?

During torch operations, it is critical to use effective shielding materials that can withstand high temperatures and prevent fire hazards. Plastic or other combustibles that could ignite easily are never suitable as shields because they can easily catch fire when exposed to the intense heat generated by torches. The flames and sparks produced during these operations can easily ignite plastics, leading to hazardous fires and compromising safety.

Using materials that are non-combustible, such as certain metals, is advisable because they can contain the heat and prevent the spread of flames. While wood and natural fibers, as well as glass or ceramics, may have specific safe uses in different scenarios, they can also present risks under certain conditions. However, the key focus remains that plastics and combustible materials should be strictly avoided to ensure the safety of personnel and the environment during torch operations.