The already low abrasion of the igus® e-chain® is yet again significantly reduced by the application of a special material. An e-chain® can also be used hereby in many applications that presented intricate special solutions so far. An extensive test program has been completed for both gliding and unsupported applications. For many applications, the e-chain® made of special material can be operated practically free of abrasion. The IPA tests confirm that the standard e-chain® from igus® is sufficient for clean room requirements. "proven and tested excellent!" The moving parts in clean rooms require a very high wear resistance. Thus for instance, an e-chain® must be extremely wear resistant in order to fulfill the standard requirements of this sensitive environment.