Polyguard SP-6 Un-bonded Outerwrap consists of a strong non-woven, felt like polypropylene fabric. The product is engineered to provide high bursting strength and low tensile and elongation properties. The result is an outerwrap with improved soil stress resistance.

SP-6 is the outerwrap for use over Polyguard RD-6. There is no adhesive on the surface of either side of the fabric therefore the non-woven fabric permits water and cathodic protection current to pass through it, the same desirable property as found in RD-6.