what are plastics used for?
Plastic objects can be mass-produced and are usually less expensive than other materials such as metals. Plastics consist of linkages of relatively long chains of molecules and often remain flexible. Plastics can be used as thin films for coatings or wraps. Plastics can resist heat and cold within useful limits and may be used to package foods although that may require special plastics that will not leech out harmful substances. Plastics can be used to fabricate credit cards (nicknamed 'plastic' money).
