NETZSCH Fine Particle Technology: The updated ZETA RS is equipped with an advanced media separation system and improved mechanical seal system that allow the mill to handle the smallest grinding media and enable the mill to grind particles as small as 50 nm. It also meets requirements for comminution down to the nano range using the mild dispersion process, which protects the desired properties of the material. With a new tilting-chamber feature that allows easier loading and unloading of grinding media, it is available in four chamber sizes, ranging from two liters to 25.