11. Plastic container code system. CODE MATERIAL PERCENT OF TOTAL Polyethylene Terephthalate (PET) 20-30 percent High Density Polyethylene 50-60 percent Polyvinyl Chloride (PVC) 5-10 percent Low Density Polyethylene 5-10 percent Polypropylene 5-10 percent Polystyrene 5-10 percent All other resins 5-10 percent
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19. Timeline of Plastics 1862 – First man-made plastic 1866 – Celluloid makes it’s debut 1891 – Rayon is discovered 1907 – Bakelite is invented 1913 – Cellophane causes the plastics craze
20. Timeline of Plastics 1926 – PVC is invented 1933 – Polyethylene is discovered 1933 – Saran makes it’s debut 1938 – Teflon is discovered 1939 – Nylon stockings hit market 1957 – Here comes velcro
