High purity copper powder, nominal mesh 100, Apparent density: 2.6 g/cc, Copper > 99.5%, with irregular shape particles. Used in powder metallurgy. May be admixed with other metal powders and graphite for specific properties such as strength, hardness and wear resistance for structural parts.HTS Code: 7406.10.0000 NMFC: 30743 CAS: 7440-50-8 Additional Description 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.