Being in the plastics business for some year you gentlemen are going to have a problem convincing me that rubber is better
90 percent of all rubbers are a synthetic of plastic
One little note polyurethane is used to replace springs in punch press die and take millions of hits before replacements a natural rubber component would take about 10 hits and disintegrate
There is so many plastics out there for many uses and the right one being used makes the difference
finish your home work it is in the supplier
