Density of fillers

True Density or Specific Gravity. The average mass per unit volume of the individual particles is called the tme density or specific gravity. This property is most important when volume or mass of the filled composition is a key performance variable. The tme density of fillers composed of relatively large, nonporous, spherical particles is usually determined by a simple Hquid displacement method. Finely divided, porous, or irregular fillers should be measured using a gas pycnometer to assure that all pores, cracks, and crevices are penetrated. 

The data in Table 5.1 show that the range of densities of fillers is veiy wide ranging Ifom 0.03 to 19.36 g/cm. If we allow that air can also be considered a filler and platinum may be potentially applied in conductive materials, fillers occupy the full spectrum of density of known materials. But it is apparent Ifom the table that most fillers have densities in a range from 2 to 3 g/cm. ... 

Table 5.9. Maximum packing volume fraction, ( )m, of some fillers calculated by dividing tamped density by specific density of filler...

Part 7 Determination of the particle density of filler — Pycnometer method... 

Using the particle density of filler, the air void content of the compacted filler (v) is calculated from the following formula ... 

CEN EN 1097-7.2008. Tests for mechanical and physical properties of aggregates — Part 7 Determination of the particle density of filler-Pyknometer method. Brussels CEN. 

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