Медь заземляющий стержень

Copper ground rod parameter (1):Copper layer thickness : ≥0.25mm (2):Resistivity : ≤0.15ohmM (3):Tensile strength : 500-580N/mm² (4):Tensile ratio : 0.8-0.95 (5):Elongation : 8%-15% (6):Earth rods be bent over120°,no crack peeling or sharp (with a 71mm diameter forming wheel) (7):10% nitric acid liquid concentration in 90 hours, corrosion may weightlessness 15% (8):Continuous copper layer super-high temperature 300 degrees above 1 hour after quench, copper layer wont spalling