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See Chinese contents: YS/T 581.15-2021 YS/T 581.15-2021: Determination of chemical content and physical properties of aluminium fluoride - Part 15: Free alumina content
This document specifies a method for the determination of free alumina in aluminum fluoride. Gravimetric method is used as arbitration inspection method. This document is applicable to the determination of free alumina content in aluminum fluoride. The gravimetric method is applicable to aluminum fluoride products, which are produced by wet processes. The chemical composition balance calculation method is applicable to aluminum fluoride products, which are produced by all processes. The measurement range is 0.1% ~ 15%.
