ASTM International · 1967
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Test method for measuring the electrical admittance (or impedance) of sealed anodic coatings. The admittance value correlates inversely with seal quality — a properly sealed coating shows low admittance, an unsealed or poorly sealed coating shows high admittance. Used as a non-destructive seal-quality QC method alongside the dye-stain test (ISO 2143) for sealed anodize batches.