Paragraph 4 PROCEDURE

The sample is divided representatively into portions of approximately 100 grams.

Weigh one of these portions to the nearest 0.1 gram.

Arrange the nest of sieves in ascending order (receiver, 0.5 mm, 1 mm, 2 mm) and place the weighed test portion on the top sieve. Fit the lid to the top of the nest of sieves.

Shake by hand or machine, imparting both a vertical and horizontal motion and, if by hand, tapping occasionally. Continue this process for 10 minutes or until the quantity passing through each sieve in one minute is less than 0.1 gram.

Remove the sieves from the nest in turn and collect the material retained, brush gently from the reverse side with a soft brush, if necessary.

Weigh the material retained on each sieve and that collected in the receiver, to the nearest 0.1 gram.