At a Temperature of -20 °, Shock Viscosity Still Matters an Average of 6 KGM/CM2. Shock Viscosity Is Different for Sheets and Shaped Metal, and At Normal Temperture for Sheets Its Lower THE FOR CORNERS. ALSO The Paving Stones Differs in Properties and Structure. A High -quality Paving Stones Will Serve for a Long Time and Reliably, And You Can Purchase Such A Cobblestone From An Experienged Supplier.