Unistrut 5-Hole U Shape Channel Bracket Hot Dip Galvanised (P1047) Unistrut's hot dipped galvanized finished channels, cable tray and cable ladder, in addition to galvanizing to BS EN ISO 1641, receive additional protection in the form of a clear passivation coating. As part of this protection the coating minimizes the risk of staining effects, such as handling and wet storage stain (white rust), which are prevalent during the initial period of the product's life cycle. .