Porometer

A porometer is an instrument that characterises pore structures by capillary‑flow porometry or related methods. Using a defined wetting liquid and controlled gas pressure, it determines the pressure at which the largest through‑pores empty (bubble point), the mean‑flow pore size (MFPS, where half the flow passes through larger pores and half through smaller), and the flow‑weighted pore‑size distribution. Porometry is non‑destructive for most polymeric and metallic media and directly relates to hydraulic behaviour, making it a key QA and development tool for woven meshes, sintered laminates and composite media. Reliable results require full wet‑out, stable temperature, correct liquid selection for surface chemistry, and leak‑tight fixtures so bypass does not distort curves. In specifications, porometry complements permeability and retention data, providing a reproducible link between geometry and performance over the media’s service life.