Looking for high-purity superfine copper powder Cu63/Cu65

Looking for high-purity superfine copper powder Cu63/Cu65. The product should have a Cu-63 composition of 69.1% and Cu-65 composition of 30.9%. The purity stated in the storage documentation should be 99.998% and on the original product packaging should be 99.999%. The material should be stored in sealed containers. Please ensure that analysis and storage documentation are available. Interested suppliers are invited to send their product specifications, availability, and quotation.