This part of ISO 9398 defines the characteristics of washer-extractors and gives the usual test methods for these characteristics with regard to machine capacity, power and water consumption, and hourly productivity. It is applicable for use as a reference in the drafting of purchasing orders for washer-extractors whose net usable cage volume is greater than 60 dm (litres). It does not cover safety requirements (see ISO 10472-2). NOTE If more detailed information on the effect of laundry machines on textiles is required, see ISO 7772 after agreement between the parties involved.