Very high purity, air atomized, hydrogen reduced ultra fine copper powder. Spherical particle. High conductivity. High Density.HTS Code: 7406.10.0000 NMFC: 30743 CAS: 7440-50-8 Additional Description Recommended for: Thick and Thin Film pastes Capacitor Chips End cap Terminators Conductive Inks, paints and pastes Injection Molding Electronics Thermal management EDM Electrodes Thermal Sprays Sintered alloys/ products Brazing/ soldering paste Typical Analysis: Copper: 99.81% Iron: 0.01% Hydrogen Loss: 0.18% Apparent Density: 4.89 g/cc SIEVE ANALYSIS +200 MESH: 0% -200+325 MESH: 4.8% -325 MESH: 95.2% Note: Pure copper powders do not show continuity or conductivity by a multimeter. I think there are two reasons for that. One is the low voltage used for the test. The other is lots of air and weak contacts between the particles. They will show conductivity with higher voltage, when they are compacted and when they are mixed with some oil or resin to form a paste.