HPL PE-Coated Culverts
HPL is a polyethylene-coated galvanised steel with the same steel strength and galvanizing weight (G250, Z600) as used in the manufacture of our standard culverts. The reinforced PE layer provides considerable additional protection to the underlying Z600 galvanizing resulting in substantially increased lifespan of the culverts even in the most aggressive conditions.
The HPL materials are available in wall thicknesses of 1.6mm to 3.0mm in the 68 x 13mm and 125 x 25mm corrugation profiles specified in AS/NZS 2041.4. The culvert diameter range will remain the same – 300mm to 3,650mm on our standard mills, with the potential for >4,000mm on our mobile mills.
Unlike other PE-coated steels, HPL has a reinforcement layer within the polymer that provides very high resistance to abrasion, harsh environmental conditions, and localised surface damage. The coating is applied on both the internal and external surfaces of the culverts, as shown below: