(foam rubber; cellular rubber). A flexible foam produced by beating air into heat-sensitized latex, with subsequent vulcanization, or by incorporating ammonium carbonate or sodium bicarbonate into a strongly masticated and highly accelerated rubber mixture. As the temperature rises to the curing range, ammonia or carbon dioxide is released, forming uniform pores throughout the mixture just before the onset of vulcanization.
Use:
Vibration damping pads and inserts, rug and carpet underlays, mattresses and upholstery, seat cushions.