The Micromeritics DVVA 4000 is a state-of-the-art dynamic void volume analyzer capable of measuring the compressed void volume and density of powders and other materials with exceptional precision and accuracy.
This instrument can be used to predict the optimal polymer/carbon black ratios in polymer-reinforcing materials, providing an automated alternative to the oil absorption test, while satisfying the requirements of ASTM D6086 test method.
Pharmaceutical powders, resins, rigid foams and non-woven fiber mats are examples of manufactured materials having secondary characteristics directly related to void volume. Having a high resolution set of data that describes the void volume vs. pressure characteristics of the material is a fundamental step in understanding, controlling or predicting phenomena related to void volume.
Operation :
Prior to a test, the mass and density (skeletal or theoretical) of the sample material is entered. The test involves compressing the sample either in a constantly increasing pressure mode or in a step-wise fashion to a pressure up to 230 MPa (33,000 psi). During compaction, the change in volume is monitored as a function of pressure, thus recording the compacting behavior of the material to be characterized. The difference between the initial apparent volume and the final apparent volume expresses the reduction in void volume as a result of compression and the difference between the final apparent volume and the skeletal volume is the remaining void volume.
