Steelbond Screws & Fasteners Climaseal 3Climaseal® 3 is an unique anti-corrosive coating system consisting of 3 distinct layers which combine to give exceptional corrosion protection: (1.)A mechanically deposited zinc tin alloy coating giving excellent galvanic protection.(2.)A passivation coating to passivate the zinc tin alloy, further inhibiting coating loss.(3.)An aluminium filled polyester coating with good all-round corrosion and long-term weathering resistance.Designed to conform to AS3566 Class 3, real life atmospheric testing has confirmed that the performance of Climaseal® 3 far exceeds the standard! If you want a fastener with a high-performance, corrosion resistant coating that won’t let you down, consider these benefits:(1.)Minimal risk of coating damage during installation thanks to new, tougher coating formula.(2.)Better driving performance because of a smoother, harder finish.(3.)Superior performance in extreme temperatures, developed and tested in Australia for Australasian conditions.(4.)Effective sealing of roofing sheets/cladding The black seal remains elastic in temperature extremes, and will not breakdown and allow water entry.