Glass Plate

Spare glass plate with polished rims; Dimensions: 100 x 150 mm (3.9 x 5.9 in)

Procedure

Place flow cup in a precisely horizontal position using ring stand or temperature control jacket
Close orifice
Pour in test liquid
Draw a clean glass plate over the rim of the cup, removing superfluous liquid into the overflow reservoir and closing the cup
Remove glass plate horizontally
Open the orifice and start the stopwatch simultaneously
Stop the watch with the first break in the efflux stream
Repeat the measurement three times, each with a new sample of the same material