Tap Density Analysis

Tap Density Analysis
Table reports the tapped density computed for 136.07g of commercial cement measured using the Anton Paar Autotap. Using this tap density, the Compressibility Index for the cement sample was calculated to be 29.7.

Tap Density Analysis provides fast, effective measurements of the bulk density of powders and establishes a quantitative metric for compressibility, maximum packing efficiency, and other granular system properties.

It is used in formalized quality testing protocols set by a number of international standards. Covalent’s Autotap analyzer from Anton Paar is configured to meet all of their requirements.

Strengths
  • Excellent reproducibility
  • Well established procedures and international standardized measurements
Limitations
  • Accuracy of volume measurement relies on operator
Base Prices
Technique Variants
Pricing Starts At
Action
Tap Density Analysis
$175 / Sample
Example Outputs

Table reports the tapped density computed for 136.07g of commercial cement measured using the Anton Paar Autotap. Using this tap density, the Compressibility Index for the cement sample was calculated to be 29.7.

From: Anton Paar
Instruments Used for
Anton Paar Autotap

Anton Paar Autotap

  • Cylinder Sizes: 250 mL (standard), 10 mL, 25 mL, 50 mL, 100 mL, 500 mL, 1000 mL
  • Nominal Tapping Rate: 260 taps / min (supports up to 300 taps / min)
  • Tapping (drop) Height: 3 mm
  • Maximum Tap Count per Trial: 999,999
  • View Instrument Spec Sheet
Sample Requirements
  • Powder, granular, or flaked solid
How Works

The bulk density of a powder sample depends upon its preparation, as well as subsequent treatments, processing, and storage. Handling granular materials causes their particulates to rearrange and pack together due to cohesion and shape effects, and this forms the basis of tap density analysis. The tapped density of a powder provides a quantitative metric of its compressibility and maximum packing efficiency.

Together, these properties are crucial to controlling quality in raw powders used in numerous production materials, such as: cement, dolomite, and bitumen in construction work as well as in pressed pharmaceutical pills and capsules.

To make a tap density measurement on a sample, its mass must first be measured using a high-sensitivity scale. Once the mass is known, the sample can be loaded into a graduated cylinder mounted on the analyzer (sometimes called a “tap volumeter”). The initial bulk density is calculated using the reported volume after the powder settles. Then, the cylinder is mechanically tapped many times to redistribute the particulates until no further volume change is detected. To maximize volume accuracy, the cylinder is automatically rotated to promote a flat powder interface.

The tap density is computed using the measured volume after the volume stabilizes. It is almost always lower than the initial bulk density.

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