3.1 Apparent density = W/V
where:
V = volume occupied by the material in the measuring cylinder, cm³,
W = weight of the material in the cylinder
3.2 Make three determinations of the apparent density on each sample and average these results separately.
3.3 Bulk factor = D2 /D1
where:
D2 = average density of the molded or formed specimen,
and
D1 = average apparent density of the plastic material prior to forming.