Dupont Nomex® laminates type NKN are duplex and triplex laminates constructed of calendered Nomex® paper bonded to Kapton® polyimide film with a proprietary high temperature adhesive system. These laminates are designed non to delaminate or blister at high temperatures.
The Kapton® polymide film in these 2- and 3- ply laminates contributes high dielectric strength, as well as good initial tear strength and tensile properties. The calandered Nomex® provides long -term stability, as well as improved propagation tear strengths.
Application: These laminates are broadly used in the manufacture and remanufacture if motors and generators of many sizes and temperature classes. The most important applications are for slot liners, wedges and phase insulation in morots and generators which have thermal requirements above Class H applications.
There are a number of insulation systems recognised by uUnderwriters Laboratories (UL), which include these laminates for temperature classes up to and including 220°C.