Apparent Density and Bulk Factor - ASTM D1895
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Apparent Density
The weight per unit volume of a material, including voids that exist in the tested material. Also called Bulk Density. Provides a measure of the "fluffiness" of a material in its supplied form.
Bulk Factor
The ratio of the density of a material after molding to the density of the raw material. Provides a measure of the volume change that can be expected during processing.
| Method |
Use |
Test |
| A |
For fine granules and powders that can be poured through a small funnel. |
Test is performed by pouring the material through a funnel into a cylinder of known volume. The apparent density is calculated by dividing the weight of the material in the cylinder by the volume of the cylinder. |
| B |
For coarse, granular materials that either can't be poured or that pour with difficulty through the funnel from Method A. |
Test is performed by pouring the material through a funnel into a cylinder of known volume. The apparent density is calculated by dividing the weight of the material in the cylinder by the volume of the cylinder. |
| C |
For coarse flakes, chips, cut fibers or strands that can't be tested with Methods A or B. |
Test is performed by pouring the material into a graduated cylinder and allowing a 2300g plunger to pack the material for one minute. The apparent density is taken as the mass of the material divided by the settled volume. |
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