ISO 8401:2017

Overview - ISO 8401:2017 (Metallic coatings, ductility measurement)

ISO 8401:2017 is an international guidance document that reviews general methods for measuring the ductility of metallic coatings with thickness below 200 μm. It covers coatings produced by electroplating, autocatalytic deposition and other processes. The standard describes test principles and procedures for both unsupported foils (coatings separated from their substrate) and coatings on substrates, and provides guidance on selecting appropriate test methods and reporting results.

Key topics and technical requirements

• Scope and applicability
  • Limits: metallic coatings < 200 μm.
  • Applicable to general measurement methods; not intended to replace specific test methods already given in other standards for particular coatings.
  • When a specific international standard exists for a coating, that method takes precedence and should be agreed between supplier and purchaser.
• Test methods reviewed
  • Tensile testing (on foils and coatings on substrates)
  • Bending tests: micrometer bend (bend radius), three-point and four-point bending
  • Folding (vice-bend)
  • Mandrel bending: cylindrical, spiral, conical
  • Bulging tests: hydraulic bulge and mechanical bulge
• Test preparation and results
  • Guidance on specimen preparation, apparatus, procedures and expression of results.
  • Annexes include methods of producing foils and formulae for calculating ductility and tensile strength in bulge tests.
• Selection and reporting
  • Guidance to select the most suitable method based on coating type, thickness and intended use.
  • Requirements for comprehensive test reports to support quality control and contractual acceptance.

Applications - who uses ISO 8401:2017

• Coating manufacturers and electroplaters validating ductility of plating processes.
• Quality assurance and testing laboratories establishing test programs and interpreting results.
• Design and R&D engineers assessing mechanical performance of coated parts (formability, fatigue).
• Purchasers and specifiers requiring reproducible, agreed test methods in procurement contracts.
• Standards developers and technical committees referencing standardized measurement approaches.

Practical value and SEO keywords

ISO 8401:2017 helps ensure consistent, comparable ductility measurement for metallic coatings, supporting quality control, failure analysis, and supplier–purchaser agreements. Keywords: ISO 8401:2017, metallic coatings, ductility measurement, electroplating, autocatalytic deposition, tensile testing, bend test, bulging test, mandrel bending.

Related standards (if applicable)

• Specific international standards for individual coating types (which take precedence when present). Users should check for coating-specific test standards before applying ISO 8401:2017.