15. POLYMERS (HM)
Explanation:
Examples of synthetic polymers include nylon, polyethene, polyester,\(PVC\),Teflon and epoxy.
Cellophane is a thin, transparent sheet made of regenerated cellulose. Its low permeability to air, oils, greases, bacteria and water makes it useful for food packaging.Cellulose is a natural polymer hence cellophane also falls into this category.