Which type of clothing should never be worn when handling petroleum?

Nylon or wool clothing should never be worn when handling petroleum due to their properties that can pose significant safety risks. Nylon is a synthetic material that can easily melt when exposed to high heat or flames, potentially causing severe burns to the skin. Wool, while better than nylon in terms of melting, can still retain flammable vapors, which increases the risk of ignition in the presence of petroleum products.

When handling petroleum and other flammable substances, it's crucial to wear clothing made from natural fibers, like cotton, which is less likely to melt and burns more slowly, providing a higher level of safety. Clothing made from leather can also offer some protection and durability against spills, while polyester is generally not recommended due to similar melting hazards as nylon. Therefore, the choice of materials is vital for ensuring the safety of personnel working with flammable substances like petroleum.