Sep 07, 2020 The mill has a compact design giving high power density kWm3 connected with a small footprint. The purpose of the HCH ultra-fine grinding is to offer the most cost effective and efficient ultra-fine grinding mill available to the powder market. HCH Ultra-fine Grinding Mill. Max feeding size 10mm. Capacity 0.7-22th. Fineness 0.04-0.005mm.