grain size
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When is it necessary to measure grain size? Testing criteria? Acceptance criteria?
Grain size generally refers to the size of the grains, and it is likely related to certain properties; for example, the grain size of the active components in a catalyst is associated with the catalyst’s conversion rate and selectivity. When the grain size is within a certain range, the conversion rate and selectivity reach their optimal values, and it may be possible to determine this by measuring the grain size. There shouldn’t be any standards for this either.