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Sotax TD1 Tapped Density Tester

Tapped Density Testing.

Tapped density of powders or granulates is an increased bulk density attained after mechanically tapping a cylinder containing the sample. SOTAX tapped density testers combine Method 1 and Method 2 with different stroke heights (drop) as described in United States Pharmacopeia (USP <616>) and European Pharmacopoeia (Ph. Eur. 2.9.34) in one compact unit. Comparison of the bulk and tapped densities with Compressibility Index and Hausner Ratio indicate the ability of the powder to flow and settle.

Tapped density is measured by first gently introducing a known sample mass into a graduated cylinder and carefully leveling the powder without compacting it. The cylinder is then mechanically tapped by raising the cylinder and allowing it to drop under its own weight using a suitable mechanical tapped density tester that provides a suitable fixed drop distance and nominal drop rate.