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A Modern Approach to the Heckel Equation: The Effect of Compaction Pressure on the Yield Pressure of Ibuprofen and its Sodium Salt Hooper D1,2*, Clarke FC2, Mitchell JC1* and Snowden MJ1 1Faculty of Engineering and Science, University of Greenwich, Medway, ME4 4TB, UK 2 Pfizer Sandwich, Ramsgate Road, CT13 9ND, UK Abstract Despite being heavily criticised in the literature the most widely used and accepted compaction equation is the Heckel equation proposed by Heckel in 1961. View more.....