Abstract
If compacts of magnesium carbonate and phenacetin are subjected to increasing compression pressure, their surface area increases, then decreases, and at pressures in excess of 250 MNm −2 shows a subsequent rise. This rise is shown to be due to the elastic recovery of the compacts when the compressing force is removed, and evidence is presented that the use of a granulating agent reduces elastic recovery, abolishes the rise in surface area at compression pressures above 250 MNm −2 and thereby greatly increases the strength of the compacts.
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