P-201 Analysis

This analysis was developed by Volkswagen to ensure each part does not exceed the maximum porosity percentage in key structural areas of a part. Upfront in the development stage parts are assigned a maximum pore percentage value within the part.

P-201 Analysis after CT scanning at Jesse Garant Metrology Center

The OEM then provides call outs to these pore locations on supplied part prints. Next to each call out, a value is provided which lists the maximum allowable pore size percentage. These “D” values along with the area of the cross sectional slice noted on the part print are required to run this analysis. If the part print is not clear, please contact your OEM point of contact. Once a part has been CT scanned, a void analysis is performed to identify all areas of porosity within the part. The dataset is then cross sectioned according to the specified cross sections on the part print. After executing the analysis, the results are quantified and marked as either “go” or “no go” which lets the customer know if the part has met the part print requirements for each location.

*Note – In addition to the P-201 analysis identifying porosity percentage within a specific area, the program also analyzes in each area for: the size of the largest void, the number of voids, the proximity of one void to another, and the proximity of one void to the outside boundary of the part.


  • The analysis adheres to the VW 50096 and VW 50097 document requirements. Click Here for official document.

Viewing software included with your part analysis

Upon completing the analysis, a web conference is hosted by one of our experienced analysts to review the results. During that same web conference, we’ll show you how to use the supplied freeware viewing software.

  • Frequently Asked Questions

    What is the VW 50096 and VW 50097 requirement?
    Click here for official documents

    What does D callout on part prints represent?
    The D call out identifies the maximum pore size percentage relative to the surrounding cross sectional area.

    How is the location of the square around the porosity calculated?
    The program works by automatically calculating the largest possible square around the largest void within the
    predetermined cross sectional slice

    Can you see a screen shot of the pores which are outside of tolerance?
    Yes. Within the viewing software, a screen shot is included of each pore, surrounding square, and result.

    Can the analysis be run for non-Volkswagen parts?
    Yes. Just because the analysis was developed by VW doesn’t mean it cannot be executed on other P-201 parts.
    To run the analysis, we just need a location and a maximum pore size percentage.