Stainless steel ground rod is IEC 62561-2 certificate. It is built from 316L stainless, which has high chemical resistance in all types of grounds, especially pH<6. Additionally, 316L stainless is a low carbon type, and it has a stronger weld than 316 stainless when proceeding exothermic welding.
*Caution: stainless steel ground rod under IEC 62561-2 standard must have molybdenum composition >2% for rust prevention. Consequently, an ordinary 304 stainless cannot be used as a ground rod abided by the IEC standard. *