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The apparent bulk densities of powdered, granular, or flaked materials are dependent on how the particles are packed together due to cohesion and shape effects. Furthermore, handling or vibration of particulate material causes the smaller particles to work their way into the spaces between the larger particles.

The geometric space occupied by the powder decreases and its density increases. Ultimately, no further natural particle packing takes place without the addition of pressure and maximum particle packing is achieved. Under controlled conditions of tapping rate, tap force drop, and cylinder diameter, maximum packing efficiency is highly reproducible.

The Autotap rotates the cylinder during tapping, promoting a flat powder interface, which makes reading the powder surface clear and easy. If you do not know the material characteristics, you can specify step-wise tapping, while noting or graphing the results until the volume becomes constant.

This process lets you discover the proper number of taps (typically thousands, including a significant excess to account for future variability between samples) for the sample. Then, you can preset the number of taps on subsequent runs and go about your other work. Tapped density measurement is formalized in a number of international standards. Autotap and Dual Autotap conform to these standards.

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To contact Anton Paar Australia about Anton Paar Autotap | Automated Tapped Density Analyzers use Get a quote.