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A glidant is a substance that is added to a powder to improve its flowability. A glidant will only work at a certain range of concentrations. Above a certain concentration, the glidant will in fact function to inhibit flowability.
In tablet manufacture, glidants are usually added just prior to compression.
Mechanism Of Action
A Glidant's effect is due to a counter-action to factors resulting in poor flowability of powders. For instance, correcting surface irregularity, reducing interparticular friction & decreasing surface charge. The result is a decrease in the angle of repose which is an indication of an enhanced powder's flowability.
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