The sme difference as between Plain Dutch and Twill Dutch applies to PZ and KPZ. KPZ is the most rigid metallic wire cloth available and is used for extremely high differential pressures as well as for applications with the highest mechanical wear. The flow rate is comparatively low and this mesh is mainly used for filter leaves and as continuous filtration belts in extrudes. Apertures in this mesh vary from 500 micron to 55 micron.