| http://www.w3.org/ns/prov#value | - A thermoplastic, for example a polypropylene, which can form the pocket 30, preferably has a hardness in the range of 30 to 85 durometer, preferably 70 durometer, Shore D. A more flexible TPE, for example Santoprene?? or Permaprene???, which can form the sealing lips 26, has a hardness between 40 to 90 durometer preferably 70 durometer Shore A. In those configurations including the overlay layer 2
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