Uniformity of dosage units 905
Open 10 containers and accurately weigh each individual container and its contents, taking care to preserve the identity of each container. Remove the contents of each container by rinsing thoroughly with water, dry at 105
to constant weight, and reweigh. Calculate for each container the net weight of its contents by subtracting the weight of the dry, empty container from its initial gross weight. Determine the average weight of the contents and the relative standard deviation (see
Calculation of the Relative Standard Deviation under
Uniformity of Dosage Units 905). The requirements are met if the weight of the contents of each container does not deviate from the average weight by more than 5.0% and the relative standard deviation of the 10 containers is not greater than 3.0%. If the requirements of the test are not met, test 20 additional containers. The requirements are met if the net weight of not more than 1 container of the 30 deviates by more than 7.5% from the average weight of the contents of the 30 containers and the relative standard deviation of the 30 containers is not greater than 3.3%.