Permeability

Permeability measures how easily gases or liquids pass through a porous material, playing a vital role in industries like construction, pharmaceuticals, and filtration. This property affects processes such as fluid flow, material strength, and product performance, making it a key factor in design and manufacturing.

On this page, explore the principles of permeability, factors influencing it, and its applications in optimizing industrial processes and product development.

Featured Permeability Articles

  • Powder flowability technical illustration comparing normal hopper discharge with arching and pulsing caused by poor venting and unstable flow.

    Powder Flowability: Factors and Measurement Techniques

    Powder flowability is not one fixed property. A powder can look free-flowing in a simple test and still fail in a hopper, feeder, or transfer line. The right test depends on the stress state, air conditions, wall interaction, and failure mode that matter in the real process. Article updated [...]

  • Permeability collapse in hopper discharge shown in a two-panel hopper diagram, with a pressure drop and rathole in Panel A, then rathole collapse, entrained air, and a discharge surge in Panel B.

    Permeability Collapse in Hopper Discharge Causes “Random” Ratholes and Sudden Flooding

    Permeability collapse in hopper discharge often triggers instability before cohesion becomes the main driver. When air cannot move through the bed fast enough, a local vacuum forms, effective stress rises, and a rathole stabilizes. When that structure collapses, trapped air can drive flooding and sharp discharge surges. If [...]

  • Powder permeability dosing instability in a hopper feeding a loss in weight feeder.

    Powder Permeability, The Hidden Cause of Dosing Instability

    Powder permeability dosing instability often starts with trapped air. Low permeability traps air, shifts bulk density, and makes feeders surge and drift. Measure permeability, then improve venting and refill behavior before tuning the feeder. Powder permeability dosing instability rarely looks like a gas problem. It looks mechanical. The [...]

  • Porosity in Powders Ultimate Guide preview

    The Ultimate Guide to Porosity in Powders: Measurement, and Control

    Mastering porosity in powders is essential for controlling performance in applications like pharmaceuticals, ceramics, filtration, and 3D printing. By selecting the right measurement method and applying targeted process controls, manufacturers can optimize strength, solubility, flow, and functionality. Table of Contents porosity in powders Check these related [...]

  • Powder Characterization Techniques

    Powder Characterization Techniques: The Ultimate Guide

    Understanding powder characterization techniques is crucial for ensuring stability, performance, and processability in various industries. By selecting the appropriate methods to measure particle size, shape, surface area, density, flowability, and moisture content, professionals can make informed decisions, reduce processing issues, and optimize product quality. Powder Characterization Techniques Table of [...]

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More Permeability Articles

Editor’s Picks

Powder Segregation Diagnosis During Mixing, Conveying, and Filling

Categories: Conveying, Editors pick, Feature Article, Flowability, Mixing technology, Segregation, Uncategorised

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Categories: Bulk Solids Characterization, Editors pick, Flowability, Insights

Why Free-Flowing Powders Still Arch in Hoppers, and How to Diagnose the Real Cause

Categories: Editors pick, Feature Article, Flowability, Hoppers

Functional Importance of Porosity in Food Powders

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Black Mass Powder Handling: NFPA 660, 2025 Safety Regulations

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Selecting the Right Powder Mixer for your blend

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