Table 1 uses a mixture of min-min and max-min requirements. Table 2 does not specify – except that it implies 'max-min'. The Irvinamasteel web site uses a mixture of min-min (for G10-24) and max-min (for G16 upwards) as J444 specification limits for cast grit! It follows that there is a need for clarification. Table 2 should be 'corrected' to state, explicitly, that max-min values are required.