Good Morning TechNet!

Has anyone experienced or documented any examples (photos, DPA reports, chemical analysis, etc.) of the type of dielectric staining referenced in the Rogers application note below? This concern applies to composite PTFE laminates with a large volume fraction (>50%) of ceramic filler particles.

http://www.rogerscorp.com/documents/643/acm/The-Prevention-and-Removal-of-Absorbed-Chemicals-in-Ceramic-Filled-PTFE-Composites.pdf

Key Excerpts:

The material's high filler loading also contributes to approximately 5 volume percent porosity.
Low surface tension liquids such as organic solvents and surfactant laden aqueous solutions can penetrate the pores.
Failure to adequately rinse these laminates following exposure to process chemicals can sometimes result
in dielectric staining or increased dielectric loss.

I think we may be dealing with this issue and would appreciate any relevant details you may wish to share (specific dielectric materials, photos, DPA reports, chemical analyses, dispositions/resolutions, etc.)

Thank you!

John Nieznanski

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