1. Molding usually is a continuous process. 2. Multiple exposure (moisture and heat or oxygen and light) can result in accelerated deterioration. 3. In general, isometric particles are more effective as reinforcements than an isometric particles. 4. Poly(vinyl chloride) is used to make both rigid PVC pipe and flexible tubing. 5. Proteins are homopolymers. 6. Polynucleotides is a biopolymer. 7. Elastomers polymerized from monomers containing two sequential single bonds known as diene elastomers. 8. Neoprene is also known as polychloroprene. 9. The aliphatic polyamides, particularly nylon 6 and nylon 6,6 , are the most widely used engineering thermoplastics. 10. Polymer processing operations may be classified into five broad categories