Buying high purity copper powder, 500 kg

I am interested in buying 500+ kg of ultrafine or high purity nano copper powder.
Quantity: 500 kg or more
Purity: 99,9999%
Size: Ultrafine <1250 mesh, Nano >300 Nm
Isotope: 63Cu/65Cu
Security storage: EU or Switzerland
Documentation. GDMS analysis, DLS measurements, Evaluation, Safety house papers.
Contact me for more details.