Does anyone know of anybody in North America that is capable of reducing a polyamide 6/12 copolymer powder from ~5 um particle size down to anywhere between 100 nm-2 um. The smaller the better.?

Or does anyone know of any suppliers of polymers that can supply me with any thermoplastic material powder that is in the 100 nm-2 um powder size range?

Thank-you very much, in advance.... ■