Nest the specified sieves in the proper
(b) After alumination.
order above a receiving pan and place a weighed portion of approximately
Cover and shake for 30
100 grams of the dried sample on the upper sieve.
Calculate the weight
minutes using a mechanical shaker (Rotape or equal
of the material passing through each sieve as a percentage of the total
weight of sample received.
Norma-Hoffman oxygen bomb (as described in ASTM Method 942-50
Recording pressure gauge (see 6.6).
Copper or bronze tubing for connecting the bomb to the automatic recorder
(this tubing is not needed if the readings are made visually). The tubing
is 3/16 inch in internal diameter and 9 feet long (total length),
tains a helix (5 turns, 2-1/2 inches in diameter) to provide flexibility.
It has couplings at its ends and a valve a few inches from the recorder to
bleed off the oxygen.
Eliminate the lip and protruding rim of a 50 ml.
Special 50 ml. beaker.
This treatment is necessary to permit the
beaker by shaping in a flame.
beaker to fit into the bomb.