Repair of cracked polyamide backsheets

Within this paper an overview on possible repair solutions for cracked polyamide backsheets is presented. A repair procedure was developed including the following steps: (i) cleaning, (ii) pre-treatment and (iii) repair process (crack filling and sealing). The procedure was tested in the laboratory and in the field, the important topic of long-term reliability under natural and artificial weathering is still under investigation. Damage repair with restoration of electrical insulation properties and prevention of further growth of surface near microcracks have been addressed in this work. Several of the investigated repair solutions fulfilled the defined requirements regarding compatibility, applicability, crack filling and sealing of the surface.