Numbers of UWMS agglomerates vary little from core sand and WMS numbers up to 100 sizes because the major cumulative increase in surface area occurs up to the 100 sieve size ([ILLUSTRATION FOR FIGURE 2 OMITTED] as related to [ILLUSTRATION FOR FIGURE 5 OMITTED]).
assuring that both WMS and UWMS results are from the same sample;
drying of the sand for UWMS sieve analysis is not standardized.
Percent MB clay content of UWMS sieve fractions could be gained more easily from larger samples;
If the UWMS sieve analysis is to become useful, the testing and reporting procedure should be standardized.
the number of particles and agglomerates varies much more than the total surface area of WMS, UWMS and green core sand;
divergence of WMS, UWMS and core sand number of particles or agglomerates begins at 70, 100 or 140 sieve sizes increasing with AFS GFN;