Page 305 - Handbook of Plastics Technologies
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ELASTOMERS


                                                          ELASTOMERS                         4.97




























                                    FIGURE 4.35 Hardness ranges for thermoplastic elastomers.

























                                     FIGURE 4.36 TPE part fabrication in a single step vs. three or more steps for
                                     conventional elastomers.


                                4. TPE scrap (regrind) may be recycled. Such scrap is generated, for example, in run-
                                  ners and sprues from injection molding and during startup and shutdown of any pro-
                                  cessing unit. Thermoset rubber scrap is often discarded, causing an added cost and a
                                  load on the environment. Most TPEs will tolerate several regrind-recycle steps with-
                                  out significant change in properties.





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