Dry skin, usually the culprit behind cracked heels, commonly appears on such areas of the feet as the soles and heels. Shop Now. Causes: The best way to treat and also prevent dry, cracked skin on your feet is to use good therapeutic ointments and creams.Avoid using lotions, as these often contain alcohol, which actually dries the skin out more. Dry skin can result from a variety of reasons: 1  Age.2  Improperly fitting shoes. 3  Athlete's foot.4  Psoriasis.he best way to treat and also prevent dry, cracked skin on your feet is to use good therapeutic ointments and creams. Avoid using lotions, as these often contain alcohol, which actually dries the skin out more. Dry skin can result from a variety of reasons: 1  Age. 2  Improperly fitting shoes.
Addition Polymers. Addition polymers such as polyethylene, polypropylene, poly(vinyl chloride), and polystyrene are linear or branched polymers with little or no cross-linking.As a result, they are thermoplastic materials, which flow easily when heated and can be molded into a variety of shapes.olyethylene has no taste or odor and is lightweight, nontoxic, and relatively inexpensive. It is used as a film for packaging food, clothing, and hardware. Most commercial trash bags, sandwich bags, and plastic wrapping are made from polyethylene films.
Polyvinyl chloride, more correctly but unusually poly(vinyl chloride), commonly abbreviated PVC, is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.PVC comes in two basic forms: rigid (sometimes abbreviated as RPVC) and flexible.The rigid form of PVC is used in construction for pipe and in profile applications such as doors and windows. It is also used for bottles, other non-food packaging, and cards (such as bank or membership cards).n extensive market for chlorinated PVC is in pipe for use in office building, apartment and condominium fire protection. CPVC, as it is called, is produced by chlorination of aqueous solution of suspension PVC particles followed by exposure to UV light which initiates the free-radical chlorination.