Foam rubber (also known as cellular, sponge, or expanded rubber) refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure.
Foam rubber was first produced in 1929 by Dunlop researcher chemist Eric Owen using whipped latex. In 1937 isocyanate based materials were first used for the formation of foam rubbers, after World War II styrene-butadiene rubber replaced many natural types of foam. Foam rubbers have been used commercially for a wide range of applications since around the 1940s.
A foam rubber ,cylindrical, pin-cushion decorated with lace ribbon c1950 With steel dressmaking pins