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A pneumatic micro-indentation apparatus has been used to determine the hardness of tablets of aspirin at various points on their diameter. All the tablets were 13 mm diameter; the compaction pressure and the particle size of the initial material were varied. The compression was carried out in a Perspex die so that radial pressure could also be assessed during compaction. The micro-indentation apparatus measured the total deformation at the loaded point on the tablet, and also the elastic recovery when the load was removed.
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Ridgway et al. (1970) studied this question.
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