Review of EP 2.2.49 Falling Ball Viscometer Method. This review showed that only two monographs appeared to require this particular technique. We approached the EP and asked:
Has the EP considered updating this monograph to replace the existing technique or at least allowing an alternative technique? At present it appears that our clients have to develop their own in-house alternative technique, accept the use of the USP monograph test, or rely on the result stated on the suppliers Certificate of Conformity.
Their response was:
I confirm that Ph. Eur. general method is referred in only 2 monographs. Other substances are tested using a capillary viscometer (2.2.29) or a rotating viscometer (2.2.10). Replacing 2.2.49 may be considered for the next revision of the polyvinyl alcohol monograph based on a comparison of the performance of the two methods. Please do not hesitate to send us experimental results.
For more information on this, or if you have any general questions or enquiries please don't hesitate to get in touch.