scope:

INTRODUCTION

This NEMA report on the thermal aging of industrial thermosetting laminates is based on a test program carried out at the NEMA Industrial Laminate Research and Development Facility at the University of Delaware in cooperation with Underwriters' Laboratories, Inc. (U/L) to determine the thermal classifications or indices (general temperature ratings) of industrial laminate sheets, rods and tubes (rolled and molded).

A basic objective of the program was to develop engineering information which would assist the user in the selection of the proper grade of thermosetting industrial laminate best suited for use in electrical insulation systems and products which may operate at higher than room temperatures. Heretofore, the design engineer has not had such industry information available based on actual tests.