---
title: "ASTM B457 — Citation Detail"
description: >-
  Test method for measuring the electrical admittance (or impedance) of sealed anodic coatings. The admittance value correlates inversely with seal quality — a pr
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last_modified: 2026-05-24
---

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## Abstract

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.

## Source details

- **Type:** Standard
- **Year:** 1967
- **Edition:** Reapproved 2018
- **Issuer / Authors:** ASTM International
- **Official source:** <https://www.astm.org/standards/b457>
- **Access:** Paywalled via ASTM Compass
- **Last verified:** 2026-05-21

## Related references

- [ISO 2143](/reference/iso-2143-2017) — standard, 2017
- [IS 5523](/reference/is-5523-1983) — standard, 1983