Bulk Density

8. AS-100 Tap Density Tester Test Procedures

8.1 Cleaning Use tube brush to clean the inside of cylinder, or flush it with solvent such as acetone. If you use a solvent, it should be thoroughly dried before test.

8.2 Drying Typically, the powder is testable in its actual state. In some cases, user has to dry powder. If the powder is easily oxidized, dry it in a vacuum or inert gas. If the powder contains a volatile substance, do not dry. If it is not possible to be dried, test it in its actual state.

8.3 Weighing and inputting Weigh an appropriate amount of the sample. Turn on AS-100, press “WT”, input numbers, and Max 5 digits.

8.4 Adding Add all sample into the cylinder, keep powder surface level. Place cylinder assembly into the vibration platform.

8.5 Tapping    

    8.5.1 Press the “TAP NUM”, enter tap number. Press the “START” until the set number is completed, and instrument stops automatically. In practice, it is possible to determine the minimum tap number N when powder volume does not change anymore. For powders of the same kind, except for special tap number obtained during experiments (not less than N), tap them for 2N times. For metal powders in different size tapping 3000 times can achieve satisfactory results.    

    8.5.2 Vibration frequency adjustment. User can turn the knob to select the appropriate frequency. The maximum is 300 rpm. Usually it is 100-300rpm.

8.6 Reading and inputting volume; If the powder surface is level, read it directly. If not, read both max and min and use averaged results. Keep an estimated value. Press the “VOL” and input volume number.

8.7 Calculating After above step, press “CAL”, the computer completed density calculation based on ρ = m / v, and display the results.

8.8 Printing results. After calculating and display, press the “PRINT” when green indicator light is on.

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