Show many nonmetal non metal parts an are used in automobile steel and iron are the basic materials of automobile construction but a surprising number of non me callic substances enter also rubber is the principal contributor to quiet vibration free riding providing cushions between frame and body bumpers to take the shock of slamming doors wind laces and gaskets to keep out drafts cement to seal joints along the floor pads to keep feet from skidding off the pedals hose for radiator heater and windshield wiper mats for running boards and floor all told a number of cars have as many as rubber parts and one of current manufacture has sixty pounds of rubber products apart from tires is not unusual in a car next to rubber perhaps the mol mo 51 useful nonmetallic non metallic ingredients aai the plastics which serve many useful purposes of which some are conspicuously new though really belonging to a family of products products with which engineers have been long familiar it was at least three decades ago that resin were taken up as substitutes tor for defective electrical insulation to day similar synthetic products are widely used also for steering wheel rims control knobs instrument panels and elsewhere |