Bulk density ASTM D1895 Method C – Determination of bulk density:

ASTM D1895 Method C is used to determine the apparent density of molding compounds that do not flow freely and therefore cannot be dispensed from a standardized funnel. The procedure uses a cylindrical measuring cylinder with a nominal volume of 1000 cm³ and a Inner diameter of approximately 88.8 mm, which is defined according to ASTM specification.

The NIP-BDM1800C is specifically designed to power this large test chamber to be filled mechanically and reproducibly, to determine the packing density of poorly flowing powders.

Test setup NIP-BDM1800C

The bulk density test setup includes:

• 1000 cm³ stainless steel measuring cylinder (ASTM geometry, cylindrical, 88.8 mm inner diameter)

• Mechanical compression unit for defined filling

• tripod frame for stable vertical alignment

• analytical balance with high resolution for determining powder mass

• Tools for sample preparation (spatula, brush, scraper edge)

The test setup is designed in such a way that the filling without funnel This occurs because method C is exclusively a mechanical insertion provides for.

Operating principle

The powder is introduced into the large-volume measuring cylinder and passed through the mechanical device of the NIP-BDM1800C. evenly distributed and compacted. The cylinder has a fixed internal volume, so that the mass of the filled material can be used directly to calculate the bulk density.

Test procedure according to ASTM D1895 Method C

1. Preparation of the test setup

• Clean and dry the measuring cylinder completely.

• Level the testing device precisely.

• Ensure that the cylinder is correctly fixed in the holder.

2. Sample conditioning

• Bring the material to laboratory room temperature (approx. 23 ± 2 °C).

• Homogenize the sample without destroying agglomerates.

3. Introducing the sample

• Pour the powder into the measuring cylinder in portions.

• Activate the mechanical compaction unit of the NIP-BDM1800C to compress the material to distribute and place evenly.

• Repeat the process until the cylinder is completely filled.

4. Stroking the cylinder

• Excess material with a straight edge flush with the top edge remove.

• Do not allow any additional compaction by pressure or tapping.

5. Weighing

• Weigh the filled measuring cylinder.

• Subtract the empty weight of the cylinder to determine the net mass of the powder.

6. Calculation of bulk density

Report results to three significant figures.

7. Repeatability

• Perform at least three measurements.

• Deviation between results ≤ ± 1 %.

Technical notes

• Method C is ideal for powders that not flowing freely, e.g.:

  • ultra-fine plastics

  • moist or slightly sticky molding compounds

  • irregularly shaped particles

• The large 1000 cm³ cylinder enables a representative packing density even with materials that are difficult to handle.

• The mechanical compression unit of the NIP-BDM1800C ensures a reproducible filling without a funnel.

Evaluation

The bulk density determined according to ASTM D1895 Method C provides important information about:

• Packing behavior under mechanical stress

• Material homogeneity

• Process capability in extrusion, pressing or dosing

• Quality control and batch comparison