an insulating tape for the winding of an electric machine , in particular a rotary machine , may include an electric breakdown - resistant material , such as mica , of a support material , such as glass silk , and a thermoplastic adhesive for holding together the insulating tape . the adhesive may be a thermoplastic material having a continued use temperature at least one insulation class lower than the insulation class provided for the winding . the machine insulation has the required mechanical and electric stability after the winding insulation is impregnated with a hardenable resin .