The PTF 30ERA has three (PTF 60ERA = 6 drums) separate drums mounted on a single axis. The instrument is supplied with six ("Roche") Friability Test drums as standard although it may also be used with the Abrasion drums as an optional extra. Operation is virtually silent and the instrument may be set to rotate at speeds over the range of 20 to 60 rpm. The drums are made from Plexiglas (Perspex) and are in two pieces which aids cleaning. Anti static coated Plexiglas Drums are available as an option. Once the test is finished, then the samples are discharged into individual stainless steel collectors where they can have any residual dust removed. From there, they can be weighed and the weight loss has to be calculated. The instrument housing is made from stainless steel to comply with common GLP regulations