The present invention relates to a method for making an open celled microcellular
foam comprising providing at least one foamable polymer and a crosslinking agent
in an extruder, injecting at least one blowing agent into said at least one foamable
polymer and said crosslinking agent in said extruder, blending said blowing agent
injected into said at least one foamable polymer and said crosslinking agent in
said extruder, feeding said blended blowing agent, at least one foamable polymer
and said crosslinking agent in said extruder to a die, and depressurizing said
blended blowing agent, said at least one foamable polymer and said crosslinking agent.