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Size range
Indicates the largest and smallest size of lumps in a coal sample or stream. The size range of a sample containing sizes from 50 mm down to zero can be written as 50xO mm, -50+0 mm, Ox50 mm or -50 mm. Some national standards allow for such terms as: nominal upper size (or top size) which is the smallest sieve size such that not more than 5% of material is larger than 40 mm. Imperial units are also used and the ASTM allows use of a numerical numbering system for sieves giving a size range such as 2 in x No.4.
