Pans for Gross Sample, noncorroding, weight-stable
at temperature used, of sufficient size so that the sample can be
spread to a depth of not more than twice the diameter of the
largest particles if larger than 13 mm [0.5 in.] or not more than
25-mm [1.0-in.] depth for smaller coal, with pan sides about 50
to 75 mm [2 to 3 in.] high.