... natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene monomer (EPDM), silicon gel (G), and fluoro gum (FG ... natural rubber (NR), nitrile butadiene rubber (NBR), chloroprene rubber (CR), ethylene-propylene-diene monomer (EPDM), silicon gel (G), and fluoro gum (FG ...