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Phenolic paper based tubing has been used for electrical insulation since the early 20th century. The combination of the high-temperature resistant phenolic resin and a treated paper convolute wound tube provides excellent strength, weather resistance and electrical resistance.

Phenolic paper-based tubing has been used extensively through the years in various applications and parts in switch gear, transformers, tap changers, munitions, rockets, bushings, sleeves, coil forms, core tubes and casings. ZTELEC paper phenolic tubing has excellent electrical properties in high humidity conditions.

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