Appendix I A. Droppers
(Ph. Eur. text 2.1.1)
The term ‘drops′ means standard drops delivered from a standard dropper as described below.
Standard droppers (Figure 2.1.1.-1) are constructed of practically colourless glass. The lower extremity has a circular orifice in a flat surface at right angles to the axis.
Figure 2.1.1.-1. –Standard dropper
Dimensions in millimetres
Other droppers may be used provided they comply with the following test.
20 drops of water R at 20 ± 1 °C flowing freely from the dropper held in the vertical position at a constant rate of 1 drop per second weighs 1000 ± 50 mg.
The dropper must be carefully cleaned before use. Carry out 3 determinations on any given dropper. No result may deviate by more than 5 per cent from the mean of the 3 determinations.