Spiral-wound insulating tubes engineered for easy insertion, secure retention, compact profiles, tight dimensional tolerances, and consistent dielectric performance. Extensive customization options. SpiralGuard. Politubes Srl is an Italian company with global leadership in the production of composite insulating tubes and caps for low-, medium-, and high-voltage electrical applications. Different wall thicknesses could be produced according to your demands. The standard length is up to 6 000 mm. materials: PE-HD, PE-80, PE-100, PE natural, PE-EL, PE coloured PP-H. From complex laminates to shrinkable spiral wound tubes, we are certain we can make a tube that will fit your needs, and we'll get it done within budget. Need to Place an Order, Request a Sample or Datasheet? Below you can find. The Original Paper Tube Company Since 1934 - Precision Paper Tube Company has been producing custom products made in the USA for more than 80 years.