The offered product ultrafine copper powder (99.999%) has been tested by IGAS, one of the leading laboratories within the precious metals industry. Further information: Powder Isotope CU63/ CU65 Origin: Russia Purity Level (5N) 99.999% Certification: IGAS Research, Goslar, Germany Minimum buying amount: 10kg Price $500/gram Shipment of gram-scale samples for in-house quality control is possible