Short description
The document contains a classification of the cleanliness of process media. Beyond the cleanliness of liquid and gaseous media, this classification can basically also be applied to complete systems, i.e. including particles released by installations. For the purpose of qualifying particulate cleanliness, the Guideline describes standardised measurement procedures and provides indications for assuring the required cleanliness conditions. The application of these measurement techniques is carried out by means of inspecting installations for process media supply, see also parts 8 and 10 of this Guideline, as well as for the qualification of commercial products. In respect to ensuring particulate cleanliness of process media at the point of use, aspects of microfiltration are condidered.