Caking

Caking refers to the undesirable formation of solid lumps in powders or granules due to factors like moisture absorption, temperature changes, or prolonged storage under pressure. This phenomenon reduces flowability and affects processing efficiency, posing challenges for industries such as food, pharmaceuticals, and chemicals, where material consistency is essential.

On this page, explore the underlying mechanisms of caking, its impact on product quality, and effective strategies to mitigate it. From controlling environmental conditions to modifying material properties, learn how to prevent caking and maintain optimal material performance.

Featured Caking articles

  • Wall friction drift in hoppers, shown as clean wall flow versus film driven ratholing.

    Wall Friction Drift in Hoppers: Why Discharge Degrades Over Time

    Many hopper issues are boundary-limited. Wall friction drifts upward over time, so discharge fails even when specs look unchanged. Measure wall friction at operating stress and humidity, then fix the wall first. This is not arching theory This is not a generic “bad flowability” story. It is [...]

  • Illustration showing water activity in powders versus moisture content, with internal water inside particles and surface water forming liquid bridges at particle contacts.

    Water Activity in Powders: Why Moisture Content Misleads in line drifts during production

    Water activity in powders predicts caking, sticking, and flow loss better than moisture content. Track aw for problem materials, then set action limits before the line drifts. A quick case from the plant floor A team shipped a powder that met the moisture spec. The blend flowed well [...]

  • Clipboard showing a t0 vs t24 powder strength table next to a shear tester and stacked bags, used to separate caking from compaction.

    Powder Caking vs Compaction Test: That Tells You Which Problem You Have

    Powder caking vs compaction can look identical in production. However, they need different fixes. Run a time consolidation shear check at two time points. If strength grows with time at fixed stress, caking dominates. If strength mainly follows stress, compaction dominates. Why This Confusion is Costly in terms [...]

  • Industrial spice milling and blending line with airborne powder and spice bowls, showing how hidden additives in food supply chains can enter during upstream processing.

    The Hidden Additives in Food Supply Chains Consumers Never See

    Hidden additives in food supply chains often enter as processing aids at spice mills and then carry over into blends without being disclosed on the label under compound ingredient rules. Hidden additives usually come from upstream milling aids, not the final blender, so labels can stay generic while additives still carry over. [...]

  • Caked white powder with fresh granules pouring from a metal chute in a dark lab setting.

    Powder Caking Prevention: Causes, Testing Methods, and Proven Fixes

    Powder caking can be predicted and, in most cases, prevented. It follows a small set of traceable mechanisms, so it is not guesswork. Use DVS, shear, and dwell tests to pinpoint the onset. From those results, define storage windows with real numbers instead of rules of thumb. Then design hoppers, packaging, and climate [...]

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