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There are also two very different types of neoprene foam:
"Gas Blown" from Rubatex and some other makers, and the more common "chemically foamed" neoprene. The Gas Blown type is made by injecting high pressure nitrogen into the rubber "batter" and then allowing it to expand and cool, producing one inert sheet of neoprene foam.
The "chemically foamed" type is made by mixing in chemicals and the "cooking" the batter to expand and set it, like a giant pancake baking. The problem is, chemically foamed neoprene does SHRINK over the years, and sometimes degrades due to chemical actions or bad chemical choices.
But, most foamed neoprene on the market is chemically foamed since it can cost 1/2 as much to make it that way.
If you are using neoprene foam and want it "forever", buy the nitrogen foamed stuff. There will be a tag or other identifier on the roll. With a good eye, you can also see a difference in the texture of the rubber on bare cut edges.
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