What is Porosity Analysis?

Porosity analysis refers to the CT-based quantification of pores and voids in a component’s volume. The method delivers actionable quality data for product release, process optimisation and root-cause analysis.

Scientific background

Methodologically, the procedure relies on standardised workflows covering data acquisition, segmentation, feature extraction and evaluation. Core elements include defect segmentation, clustering and evaluation against acceptance criteria. Meaningful results only emerge from traceable criteria and defined acceptance limits.

Relevant key metrics

Detection limit and misclassification risk for the relevant failure modes.
Repeatability of the evaluation for identical input data.
Relationship between indicators and functional load zones / specifications.

Standards and thresholds

Standards: ISO 15708-3:2025 and ISO 15708-4:2025 for CT operation, interpretation and qualification.
Typical thresholds (in practice): Pore volume fraction in critical areas often limited to max. 0.5 %; additional limits for maximum pore size and location relative to functional surfaces.
Validity: Specific limits are material-, load-case- and OEM-specific and must be contractually defined.

Application in industrial practice

Data-based release decisions during ramp-up and series production.
Early detection of deviations with cause-oriented prioritisation.
Improved customer and supplier communication through objective CT reports.

Sources and reference date

ISO 15708-3:2025.
ISO 15708-4:2025.
Reference date: February 2026.