Polyguard SP-6™ Unbonded Outerwrap is a key component of the RD-6® Coating System, engineered to deliver enhanced protection against soil stress and mechanical damage.

Unlike traditional bonded outerwraps, SP-6™ features a strong, non-woven polypropylene fabric with high tensile strength and low elongation, allowing it to move independently from the coating layer. This design prevents stress transfer and deformation, ensuring long-term corrosion protection.

Unlike traditional bonded wraps, SP-6™ is designed to move freely under soil stress, acting as a slip-plane that prevents stress from transferring to the anti-corrosion coating. This design reduces deformation, mitigates electrolyte penetration, and maintains the non-shielding properties that allow cathodic protection currents to reach the substrate — ensuring long-term corrosion defense.

• Key Advantages:

  • Integral part of the RD-6® Coating System

  • Non-bonded design prevents soil stress transfer

  • High tensile strength and low elongation for superior durability

  • Non-shielding—allows cathodic protection currents to pass through

  • Maintains system integrity under challenging buried conditions

  PetroMarys proudly supplies SP-6™ Unbonded Outerwrap to support reliable, long-lasting pipeline protection systems worldwide.