Permanent Anchors (lifespans in excess of 2 years) require sufficient corrosion protection to ensure durability throughout the working life of each anchor. Double Corrosion Protection, featuring factory pregrouted encapsulation of the bar within a corrugated plastic sheath, ensures comprehensive protection to all parts of the anchor. Protection at the anchor head is provided by a fully enclosed assembly. Borehole Grout is not recognised as a corrosion protection barrier by current anchor standards (BS8081 or EN1537) .