We at Excell Global Enterprises, based in Mumbai - India are the Suppliers for: 1) Superfine Copper Powder, Particle Size 10 Microns - 48 Microns, Purity 99.999% The Specifications for the Superfine Copper Powder are: The content/purity of Copper element in the Copper Powder is 99.999% The Isotope Composition of the Copper Powder is Cu63-69.09+/-0.05 / Cu65-30.91+/-0.03 The Copper Powder is not radioactive. The Specific Radioactivity of the Copper Powder is no more than 1.10 - 11 Ci/g2) Ultrafine Copper Powder, Particle Size 1 Micron - 7 Microns, Purity 99.990% - 99.995% The Specifications for the Ultrafine Copper Powder are: The content/purity of Copper element in the Copper Powder is 99.990% - 99.995% The Isotope Composition of the Copper Powder is Cu 63: 69.09+0.05 / Cu 65: 30.91+0.03 The Copper Powder is not radioactive. The Specific Radioactivity of the Copper Powder is no more than 1.10 - 11 Ci/g As an assurance for the Quality, the Superfine Copper Powder & the Ultrafine Copper Powder are duly assayed & certified by TAC Giredmet - Russia & IGAS Research - Germany. Interested & genuine Buyers please feel free to contact us. Thank you. Best regards, Kunal Shah Excell Global Enterprises Mumbai - IndiaSkype: excellgeWebsite: www.excellge.com