COPACO is a highly durable electrical insulation presspaper known for its exceptional tensile strength, tear resistance, puncture resistance, burst strength, and dielectric properties. It typically comes in a high-density format with a smooth finish, offering excellent resistance to abrasion and punctures. The material is ideal for punching, folding, forming, and creasing.

Manufactured exclusively from high-quality, new cotton cuttings, COPACO paper undergoes thorough cleaning and special refining to ensure maximum purity and physical strength. It contains no sizing, clay, fillers, or chemical additives. This lack of impurities enhances its long-term aging performance, meeting the strictest standards, including MIL-I-695 Type “R” specifications.

COPACO papers are widely used in armatures and stators of fractional horsepower motors, as well as for phase insulation. They are also suitable for core and layer insulation in transformers, and in various other devices for washers, gaskets, shielding, and barrier insulation.

COPACO papers are increasingly being utilized in oil filled distribution transformers as tap pads at the tap locations within the coil (as shown in the image). The blue-gray COPACO paper, which folds over the taps, offers significant advantages over traditional materials. As a cotton-based cellulose paper, COPACO is four times more puncture-resistant than the Kraft papers and pressboards currently used in these locations. This enhanced resistance allows manufacturers to reduce the thickness of the tap pads while still meeting or exceeding the original puncture resistance and dielectric design requirements. The result is a more compact coil pack with a reduced air gap and outer diameter, along with improved thermal conductivity. By using COPACO insulation, manufacturers can build smaller coils, ultimately reducing the amount of copper, oil, and steel needed. The use of Copaco papers often leads to insulation cost savings due to the reduced thickness (and weight) and overall pad width required when folded.

COPACO is available in thicknesses ranging from .003″ to .125″, and can be supplied in rolls, sheets, or coils slit to your specifications.