IEC 60893-3-7 ED. 2.0 B:2003: INSULATING MATERIALS - INDUSTRIAL RIGID LAMINATED SHEETS BASED ON THERMOSETTING RESINS FOR ELECTRICAL PURPOSES - PART 3-7: SPECIFICATIONS FOR INDIVIDUAL MATERIALS - REQUIREMENTS FOR RIGID LAMINATED SHEETS BASED ON POLYIMIDE RESINS - IEC Standards (IEC, 2019)