Rockfallnetting,RockfallNettingisawiremeshnettingwhichisusedtopreventrocksfromfallingontotheroad,railwaysandotherstructures.ThemeshismadeofgalvanizedorPVCcoateddoubletwistedsteelwovenwireinacc.withASTMA641andEN10223-3.Duetotheunr***ellingcharacteristicsofdoubletwist,themeshcanwithstandhugeforcesandwillnotunr***elevenifawireisbroken.RockfallprotectionnettingwithaPVCcoatingcanbeusedinaggressiveenvironments.Inadditiontogalvanization,thesteelwireiscoatedwithaPVClayerofanominalthicknessof0.50mm.ThetechnicalcharacteristicsandtheresistanceofthePVCtoagingmeettherelevantstanda***.MildSteelWireAllthewiresusedinrockfallnetsandlacingwireh***ethetensilestrengthof38-48kg/mm(54,000-70,000psi)BS1052/80andASTMA641-97.(Thefiguresbelowareofthewirepriortomanufacturingmesh).ThetolerancesondiameterofzinccoatedwireinTableII.Theelongationatbreakismin.12%andtesttobecarriedoutonasampleofminimum30cm(12in.)long,beforemanufacturingthemesh.(InaccordancewithASTMA370-92)GalvanisationstrictlyconformstoASTMA641-97ClassIIISoftTemperCoating.Zincadherencehastobesuchthatwhenthewireiswrappedaroundacylindricalmandrelh***ing4timesthediameterofthewire,thezincshallnotflakeorcracktosuchanextentthatanyflakeorcrackcanberemovedbysimplyrubbingwithbarefingers.)