Union Process Mdl 1S Attritor Mill, Size 1, Tank Capacity: 1 Gal, Working Capacity: .8 Gal,Media Volume: 1 gal, S/S construction, removable attritor shaft, split removable cover, 2 HP 3/60/230/460 Vari speed drive, XP readout unit. The 1S Batch Attritor is a versatile, reliable, rugged laboratory size machine designed to meet virtually all lab grinding and dispersing needs either wet or dry. It allows easy and precise scale up to production size equipment with reproducible results from batch to batch. It is also suitable for small production or pilot plant work.