Filter Integrity Testing: Bubble Point, Diffusion and Pressure Hold Explained

At a glance. A filter that looks fine can still have a defect large enough to pass bacteria. The Tech Inc. Filter and Membrane Integrity Tester runs the standard non-destructive tests and records the result.

The three tests

• Bubble point: the pressure at which gas pushes liquid out of the largest pores.

• Forward diffusion: gas flow through the wetted membrane below the bubble point.

• Pressure hold (decay): pressure loss over time from the upstream side.

Why automatic

• Measures upstream volume for accurate diffusion values.

• Compares results to the filter limit automatically.

• Stores user, time and result for audits.

Frequently asked questions

Which filters can be tested? Cartridges, capsules and flat membranes.

Before or after use? Both: before use to confirm installation, after use to confirm the batch was protected.

Ask mail@techincresearch.com for a demonstration.