Which fabric is primarily made from cellulose?

Rayon is primarily made from cellulose, which is a natural polymer derived from plant materials, such as wood pulp or cotton linters. The production process involves dissolving cellulose in a chemical solution to create a viscous solution, which is then extruded into fibers. This process highlights the unique relationship between rayon and its source materials, making it a semi-synthetic fiber.

In contrast, wool is an animal fiber obtained from sheep and is composed mostly of proteins. Silk is also an animal product, derived from the cocoons of silkworms, consisting predominantly of protein fibers called fibroin. Polyester, on the other hand, is a synthetic fiber made from petroleum-based products; it does not contain cellulose and is known for its durability and wrinkle resistance.

Thus, rayon stands out as the only fabric in the list that is primarily made from cellulose, emphasizing its origins in plant-based materials.