This part of JB/T 7599 specifies the technical requirements, inspection rules, packaging, marking, storage and transportation of grade 240 polyimide enameled wire paint. This section applies to 240-grade aromatic polyimide enameled wire varnish (hereinafter dissolved and diluted with an appropriate solvent) based on aromatic polyimide resin synthesized mainly from pyromellitic dianhydride and diaminodiphenyl ether. Referred to as grade 240 aromatic polyimide paint).