a preload is applied to a thermoplastic seal to induce deformation of the seal . as the seal undergoes deformation , it completes the seal . thermoplastics such as peek , pek , pps , pekekk , and pet are examples of materials that may be used in the seal . it is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure . it is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims . 37 cfr 1 . 72 .