Despite the introduction of revolutionary man-made fabrics, plain woven cotton is still used in large quantities for electrical insulation and coil winding. These cotton tapes can also be used as sacrificial tape in resin or shellac coating processes. ASTM Type A1 material. Meets GE Spec A2A1D3 Plain woven cotton tapes are used to wrap armatures, field coils, field coil supports, and transformer windings. Very strong and cost effective. These materials are also used to wrap cables, in electrical appliances, and as a sacrificial item in resin or shellac coating processes.