The testing procedure according to VDA standard is subdevided into:
- Cleaning Curve
- Gravimetric Analysis
- Microscopic Analysis
- Particle Analysis
- Inspection Document
Calibration of the clenaliness inspection equipment is necessary to ensure reliable and reproducable data. Thus, a so called cleaning curve or extraction curve is generated.
The extraction process serves as a first sample preparation step. The contaminating particles are detached from the surface of the component.
Filtration is executed during the entire extraction procedure with a particle filter
The membrane of the filter is dried subsequently in an oven, cooled down to roomtemperature inside of a desiccator and finally analysed gravimetrically and microscopically.
Particle analysis can be extended for instance by energy dispersive X-ray spectroscopy (EDX), to determine the nature or composition of certain particles.
The results are summarized in a detailed inspection document.