Which materials are NOT commonly used in manufacturing?

Coal is not commonly used as a direct material in manufacturing products in the same way that metals, plastics, and glass are. While coal is primarily utilized as a fuel source or as a raw material in the production of electricity and heat, it is not processed and designed into finished products like the other materials listed.

Metals, such as steel and aluminum, are widely used in manufacturing for their strength and durability, making them suitable for construction, machinery, and automotive parts. Plastics offer versatility and ease of molding into various shapes, which is invaluable in creating everything from consumer goods to packaging. Glass is commonly used in products such as bottles, containers, and windows due to its transparency and aesthetic qualities. These materials are integral to producing a vast array of consumer and industrial products, whereas coal does not serve the same purpose in manufacturing contexts.