Name: ISO 29601:2011 — Paints and varnishes — Corrosion protection by protective paint systems — Assessment of porosity in a dry film
SKU: ISO 29601:2011
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Overview

ISO 29601:2011 - Paints and varnishes - Corrosion protection by protective paint systems - Assessment of porosity in a dry film - specifies standardized procedures for detecting porosity (pinhole/holiday defects) in protective paint systems applied to steel or other metallic substrates. The standard covers testing of electrically non‑conductive parts of a coating system using two principal methods: low‑voltage wet‑sponge (pinhole) detectors and high‑voltage spark testers. Methods are suitable for new coatings and for in‑service coatings (with caution about service contamination).

Key topics and technical requirements

Scope and applicability: Detect discontinuities (holes, voids, thin spots, cracks, inclusions) that lower dielectric strength in protective paint systems of any thickness on metallic substrates.
Two test techniques:
- Low‑voltage pinhole detectors: typically battery operated (9 V or 90 V; dual‑voltage possible). Use a moist open‑cell sponge to provide a conductive path through discontinuities. 90 V is normal; 9 V may be used for films ≤ 300 µm by agreement.
- High‑voltage spark testers: adjustable outputs (approximately 1 kV to 30 kV) that discharge a spark through defects. Equipment must use DC or pulsed DC (AC not permitted).
Selection by mean dry film thickness (MDFT):
- MDFT ≤ 500 µm: normally use low‑voltage detector.
- MDFT > 500 µm: use high‑voltage spark tester.
- If conductive primer or metallic layer exists, subtract its thickness when calculating MDFT.
Procedural essentials:
- Coating should be dry/clean and cured (if no manufacturer guidance, minimum 10 days at >15 °C and RH

ISO 29601:2011 PDF

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