Silicone Carbide Electroless Nickel Plating creates an especially tricky and use resistant surface area (Nearly matching the hardness of diamonds) and is particularly employed on pieces that bear endure hefty masses with little to no lubrication. Promat calcium silicate boards having gotten a CE marking for intended use Variety nine: https://ductworthinstallation35689.izrablog.com/36946553/how-much-you-need-to-expect-you-ll-pay-for-a-good-ductworth-installation