There are a few different types of thermoplastic rubbers available they can replace many different rubber components since they are easy to extrude and eliminate the vulcanization process. Different companies have taken different approaches to producing the product. Some are made up of a highly vulcanized rubber and plastic mixture where the plastic is typically a polypropylene and the vulcanized rubber component is evenly mixed throughout the melt. There are also melt-processable rubbers that can be extruded and have the same characteristics of actual rubber. TPRs come in different durometers ranging from 55A to 50D. They have excellent resistance to fatigue, high tear strength, and good fuel and oil resistance. TPR is a great fit when looking to replace seals, tubing, hoses, spacers, bumpers and other rubber parts.