Cohesion analysis

Cohesion analysis allows for the evaluation of interparticle adhesion forces that directly influence the flow, density, transformation, and stability of powders. It is crucial for the development, packaging, manufacturing, and shaping of bulk products.

Cohesion is a crucial property to consider whenever a powder is stored, transported, mixed, compressed, or encapsulated. A powder that is too cohesive can lead to blockages in silos, dosing problems, or compaction defects. Conversely, a powder that is too free-flowing can cause segregation issues.

Objectives of the analysis

• Characterize the flow behavior of powders
• Identify the risks of settling, clogging or agglomeration
• Compare different batches or formulations
• Optimize mixing, compression or packaging processes
• Justify the stability of powders in dry formulations
• Improve the formulation or choice of excipients or anti-caking agents

Methodology

Depending on the nature of the sample and the objectives, several parameters are measured:

• Static cohesion (shear test): shear strength at different consolidation levels
• Flow angle or angle of repose : a visual indicator of the behavior of a free powder
• Compressibility index / Hausner ratio : a measure of compressibility under vibration or compaction
• Dynamic cohesion (FT4 cell): simulation of flow conditions in an industrial process

Environmental conditions such as humidity, temperature or ventilation can be adjusted according to your industrial constraints.

Affected matrices

• Food powders (cocoa, protein, supplements)
• Pharmaceutical powders or excipients
• Cosmetic powders (clays, pigments, talcs)
• Bulk ingredients (minerals, plant powders, micronutrients)
• Raw materials in dry formulation

Further analyses recommended

• Consistency analysis (penetrometer, texture analysis) : measurement of the hardness or firmness of a gel or paste
• Apparent viscosity analysis : monitoring the flow resistance of pasty formulations
• Viscoelasticity analysis : study of elastic and viscous reactions under stress

Why go through YesWeLab?

At YesWeLab, we connect you with specialized powder rheology laboratories equipped with the latest technologies (FT4 Powder Rheometer, Brookfield, RST) and renowned for their rigorous standards. The majority of our partners are ISO 17025 accredited and operate in numerous demanding industrial sectors.

Our team helps you choose the most relevant method according to your objectives and to interpret the results for better control of your powder formulations.

Need a cohesion test tailored to your process?
Contact our scientific team now for customized support.