Two of the most critical physical properties of powders—bulk density and compressibility—are key indicators of how a powder will behave during handling, processing, storage, and in the final product application. Bulk density measures the mass of powder per unit volume, including the air spaces between particles. It is typically reported as loose (poured) and tapped bulk density. The difference between these values provides insight into the powder’s ability to settle or compact under mechanical agitation.

Compressibility, often expressed as the Carr Index or Hausner Ratio, reflects the extent to which a powder reduces in volume when subjected to tapping or pressure. A high compressibility index may indicate poor flowability or inefficient packing, while a low index typically corresponds to better flow and more predictable processing behavior.

At our rheology lab, we provide accurate and reliable testing services to assess powder bulk properties, supporting both routine quality checks and R&D initiatives. Our capabilities include:

• Loose bulk density measurements
• Compressibility indices (Carr Index, Hausner Ratio)
• Flowability and cohesive index analysis (upon request)
• Custom method development for complex or novel powder systems