Bulk Density by Tap Density Analysis

Bulk density is defined as the mass of the many particles of the material divided by the total volume they occupy. The tapped density is an increased bulk density attained after mechanically tapping a container containing the powder sample. Determination of Tapped Densities is a method to determine the bulk densities of powdered materials, usually drugs.

    Bulk Density Introduction:

    Bulk density is defined as the mass of the many particles of the material divided by the total volume they occupy. Bulk density is not an intrinsic property of a material; it can change depending on how the material is handled. Determination of Tapped Densities is a method to determine the bulk densities of powdered drugs under tapped packing conditions. Tapped packing is defined as the state obtained when the vessel containing the powder sample is to be repeatedly dropped at a specified distance at a constant drop rate until the apparent volume of sample in the vessel becomes almost constant.

    How it works: 

    Tapped bulk density is achieved by mechanically tapping a measuring cylinder containing a powder. After observing the initial volume, the cylinder is mechanically tapped, and volume readings are taken until little further volume change is observed (Figure 1).

    Figure 1: A tapped density analyser

    Strength of tap density analysis:

    1. Cost-effective.
    2. Easily reproducible results.
    3. Standardized procedures.

    Limitations of tap density analysis:

    Tap Density Analysis is sensitive to human errors. 

    Uses of tap density analysis:

    Tapped bulk density test is used to determine the required volume of small containers carrying a fixed mass of powder that has been compacted. The results of this test are primarily applicable to containers with volumes up to about one cubic meter. 

    Data:

    The tap density data is given in the following equation

    TD = Weight of the sample/Volume of the sample in the cylinder after tapping

    Sample requirements:
    Samples can be powders, granules, or other “divided” solids. In general, the samples should be tested in the as-received condition. In certain instances, the powder may be dried. However, if the powder is susceptible to oxidation, the powder is dried in a vacuum or inert gas. Powders containing volatile substances are not dried at all.

    Leave a Reply

    OUR SERVICES

    Core Materials Testing Services

    Metrology

    A variety of microscopy and spectroscopy tools available for precise measurements from the nano to the meter scale.

    Metrology Testing Services POPULAR TESTS:

    TEM SIMS Profilometry

    Materials Testing

    ASTM and ISO standard and custom chemical, mechanical, thermal, corrosion tests, etc. for all materials metals, ceramic or polymers.

    Materials Testing Services POPULAR TESTS:

    Nondestructive Testing Electrical Testing Chemistry Analysis

    Product Testing

    Thousands of tests for product quality and reliability under heat, humidity, temperature shock, vibration, drop, electrostatic discharge.

    Product Testing Services POPULAR TESTS:

    Vibration Testing Humidity Testing Accelerated Aging

    Looking for Material Testing?

    We have already delivered 10000+ Material Test results to top companies

      Send us a request

        Process for testing
        •  
          STEP 01

          You share material and testing requirements with us

        •  
          STEP 02

          You ship your sample to us or arrange for us to pick it up.

        •  
          STEP 03

          We deliver the test report to your email.

          Let’s work together!

          Share your testing requirements with us and we will be happy to assist you.

          ddd Just share your testing requirements and leave the rest on us!
          • Free, no-obligation consultation
          • Guaranteed confidentiality
          • Quick turnaround time
          • Hassle-free process

            ddd

            Let us combine our capabilities to achieve success!!

              idea icon
              Want to connect with an expert before you leave?