Binder content does not describe where binder sits inside a granule. Evidence from PVA–alumina systems explains why drying and adsorption chemistry deserve investigation, and how to select measurements before changing the formulation or dryer.

Mean residence time describes the center of a powder stream's transit-time distribution. It [...]

Median particle size passes QC while wafers still scratch. Here is why a ppm-level population of 1 to 10 micron agglomerates in CMP slurry drives scratch defects, and which measurements actually catch it.

LFP cathode powder quality is built in stages, not inspected at the end. This article follows the precursor-to-powder route and shows why particle size distribution and tap density are the measurements that actually tell you whether the synthesis worked.

Changed XRD peak ratios after repacking can reflect crystallite alignment or poor particle statistics. Compare independent mounts before interpreting phase conversion.

The same idealized BET isotherm can produce different single-point and multi-point surface areas because the single-point shortcut neglects finite-C effects. A controlled comparison shows what the resulting gap can and cannot explain.

Higher laser power strengthens Raman signals but can also heat or damage powder [...]

Powder packing can change a Washburn-derived contact angle even when particle surface [...]

Two powders can satisfy an oxygen limit without having equivalent surfaces. Ti-6Al-4V research shows how to interpret bulk oxygen alongside XPS chemistry and calibrated depth profiles.

When a clean-looking powder line still produces contaminated product, compare sample location with when the contaminant appears, then investigate suspected reservoirs with recovery-tested surface or rinse sampling.

When a rotary airlock valve leaks, wears, or jams, the cause usually lies in the powder rather than the equipment. This insight maps cohesion, abrasiveness, bulk density, and particle size distribution to distinct failure patterns and explains what each pattern tells you about the powder state.

September 2026's moringa leaf powder recall, set against a year of Salmonella events touching powdered milk and supergreens blends, shows why bulk powder sampling plans can miss low-prevalence contamination and why low water activity slows but does not eliminate pathogen survival.

Use measured flow functions, wall friction, and defined hopper geometry to check wall-angle suitability and cohesive arching separately, with a recalculated published example and practical decision worksheets.

Jet milling micronization reduces particle size through particle-particle impact controlled by classifier wheel speed and feed rate. Pushing the cut point lower can raise amorphous surface content and hygroscopicity in ways a passing PSD result will not reveal. This guide covers the mechanism and the tests that actually diagnose a changed lot.

Jenike shear cells and ring shear testers measure the same yield locus through different mechanics. Here is how their sample, stress range, and time differences map onto the mass-flow versus funnel-flow hopper design decision, plus a checklist for choosing between them.

Dynamic and aerated powder testing measures basic flow energy and specific energy to fill the gap between shear cell consolidation data and Hausner ratio screening, particularly for fluidized processing and rapid-refill feeding.