Gravimetric method, based on sedimentation, for the determination of the proportion of material finer than 20 æm in particle size.Cross References:BS 410BS 593BS 598:Part 2BS 604BS 812:Part 1BS 812:Part 2BS 812:Part 3BS 812:Part 101BS 812:Part 102BS 812:Part 103.1BS 1377BS 3406:Part 2BS 5497:Part 1