Polyester film/polyester fibre non-woven flexible laminate is made from high melting point polyester film and hot-rolling polyester non-woven fabric. The polyester film and polyester non-woven fabric are bonded by F-class adhesive. It has excellent heat-resistance, electrical, mechanical and impregnated properties. It is suitable for slot insulation, interphase insulation and liner insulation in Class 'B' & 'F' electric motors and electric apparatus.