本文件规定了测定塑性指数的手动方法。这些指标是塑料层的最大厚度（Y，mm）和最终收缩值（X，mm）。 本文件适用于测定灰分低于15？%，以干燥品计，如ISO 11722和ISO 1171中所述。

This document specifies a manual method for the determination of plastometric indices. These indices are the maximum thickness of the plastic layer (Y, mm) and the final contraction value (X, mm). This document is applicable for hard coals with a determined ash level less than 15？% on a dry basis, as described in ISO 11722 and ISO 1171.