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Irtotiheysmittari, ASTM D1895, menetelmä C
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ASTM D1895 Menetelmä C

Irtotiheysmittari, ASTM D1895, menetelmä C - Precision Bulk Density Analysis:

ASTM D1895 Method C is designed for determining the apparent (bulk) density of plastic materials that cannot be poured through a funnel—such as flakes, fibers, coarse regrind, or irregularly shaped particles. The method measures how these materials pack under light compression within a standardized cylinder using a weighted plunger.

Laite

• QPI‑BDM1800C Bulk Density Meter, engineered in accordance with ASTM D1895 Method C.

  • Graduated cylinder: 1000 cm³ capacity, precision‑machined stainless steel with clear volume markings.

  • Plunger assembly: lightweight stainless‑steel plunger with flat circular face and guided stem for smooth vertical movement.

  • Support frame: rigid alignment between cylinder and plunger to ensure uniform compression.

  • Base platform: stable, adjustable feet for leveling.

• Analytical balance: resolution ± 0.01 g.

• Sample handling tools: scoop, spatula, and brush for cleaning between tests.

Principle of Operation

The sample is placed into the 1000 cm³ cylinder without vibration or compaction. A light plunger is then lowered onto the surface to apply a consistent, minimal compressive force. The mass of the material occupying the known volume is measured to determine its apparent density.

Test Procedure

1. Preparation

• Verify that the QPI‑BDM1800C is clean, dry, and properly leveled.

• Confirm that the plunger moves freely and that the cylinder is correctly seated.

2. Sample Conditioning

• Bring the sample to ambient laboratory temperature (typically 23 ± 2 °C).

• Break up any large agglomerates or clumps without altering particle geometry.

3. Filling the Cylinder

• Gently pour the sample into the cylinder until it slightly overfills.

• Avoid vibration, tapping, or compaction during filling.

• Level the surface roughly with a straight edge.

4. Applying the Plunger

• Lower the plunger slowly until its flat face just contacts the sample surface.

• Allow the plunger to rest under its own weight—do not apply additional force.

• Wait a few seconds for the material to settle naturally under gravity.

5. Leveling and Weighing

• Remove the plunger carefully to avoid disturbing the sample.

• Strike off any excess material flush with the cylinder rim.

• Weigh the filled cylinder to the nearest 0.01 g.

• Subtract the mass of the empty cylinder to obtain the net sample mass.

6. Calculation

Report results to three significant figures.

7. Repeatability

• Perform at least three determinations.

• Average the results; variation should not exceed ± 1 %.

Engineering Notes

• Method C is ideal for non‑pourable materials such as flakes, fibers, coarse regrind, and irregular chips.

• The QPI‑BDM1800C’s guided plunger ensures uniform compression and repeatable packing behavior.

• Cleaning between tests prevents cross‑contamination and maintains dimensional accuracy.

• Stainless‑steel construction provides mechanical stability and corrosion resistance for long‑term laboratory use.

Result Interpretation

The measured bulk density represents the packing efficiency of the material under light compression. It is useful for:

• Evaluating feed consistency in extrusion and molding processes.

• Comparing recycled and virgin material packing behavior.

• Quality control of flake or fiber morphology.

• Process optimization for blending and dosing systems.