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Nested Bulk Density Measurement Method

Measuring the bulk density of plastics pellets using the nested method where the value acquired is near the maximum value. Measurements are reported in g/ml. The procedure is as follows: 1. Place the funnel on top of the graduated cylinder. At a rate of no more than 15ml/sec, pour the filler into the graduated cylinder. 2. Fill to the following levels and stop at each level. At each level, tap firmly along the side of the cylinder 15-20 times to agitate the pellets to encourage further nesting. Tapping should occur at the mid point of the filler or center of gravity. 200ml 350ml 500ml 3. Level the pellets carefully at the top and confirm that the average level of the beads is at 500ml. Us a small spoon to remove pellets as required. Do not tilt the graduated cylinder or disturb the nesting of the pellets. 4. Measure the weight of the pellet to a 10th of a gram. Divide this number by 500ml to get the nested bulk density in g/ml. The biggest problem with ASTM D 1895 “Standard Test Methods for Apparent Bulk Density, Bulk Factor and Pourability of Plastic Materials” is that the speed of pour is not dictated. Either is the size of the graduated cylinder or the material it is made from. These are significant factors that will alter the results. The difference between a slow pour and a quick pour is about 8.5%. This method ensures the pellets close in on a minimum energy state. Near this boundary, one can achieve repeatable results.