EN ISO 1519:2011 PDF

Overview - EN ISO 1519:2011 (Paints and varnishes - Bend test, cylindrical mandrel)

EN ISO 1519:2011 specifies an empirical bend (cylindrical mandrel) test to assess the resistance of paint, varnish and related coatings to cracking and/or detachment from metal or plastic substrates when bent around a cylindrical mandrel. The method can be used as a pass/fail check with a single mandrel size or as a progressive test using successively smaller mandrels to determine the smallest mandrel diameter that causes failure.

Key topics and technical requirements

• Test principle: Clamp a coated panel, bend it around a cylindrical mandrel and inspect for cracks or detachment.
• Test modes:
  • Pass/fail with a specified mandrel diameter.
  • Progressive testing to find the critical mandrel diameter where the coating first fails.
• Apparatus:
  • Two types of mandrel testers: Type 1 (for panels ≤ 0.3 mm) and Type 2 (for panels ≤ 1.0 mm; plastics may be thicker by agreement).
  • Mandrels made of rigid, corrosion-resistant material (e.g., stainless steel). Standard diameters: 2, 3, 4, 5, 6, 8, 10, 12, 16, 20, 25 and 32 mm (±0.1 mm).
  • Type 1 requires a mandrel-to-hinge gap of (0.55 ± 0.05) mm and free-rotating mandrels.
• Test panels & substrates: Steel, tinplate, soft aluminium per ISO 1514; plastics permitted by agreement. Panels must be flat and cut so at least three strips of ≥30 mm width are obtained.
• Conditioning: Default conditioning is (23 ± 2) °C and (50 ± 5) % RH for a minimum of 16 hours; testing should be performed within 30 minutes of removal from conditioning unless otherwise agreed.
• Auxiliary requirements: ×10 magnifying lens for inspection and a controlled-temperature chamber for tests at temperatures other than 23 °C.
• Output: Results reported as pass/fail or as the smallest mandrel diameter giving cracking/detachment. The standard also provides information on method precision.

Applications and who uses this standard

• Quality control and final inspection of coating systems (single- or multi-coat).
• Coating formulators and R&D teams evaluating flexibility and adhesion performance.
• Test laboratories performing standardized durability assessments.
• OEMs and procurement/specification authors requiring objective pass/fail criteria for coated components (automotive, appliances, metal packaging, architectural metals, plastics panels).
• Regulatory and conformity assessment bodies needing reproducible empirical test data.

Related standards

• ISO 1513 - Examination and preparation of test samples
• ISO 1514 - Standard panels for testing
• ISO 2808 - Determination of film thickness
• ISO 15528 - Sampling of paints, varnishes and raw materials
• Related deformation tests: ISO 6860 (conical mandrel), ISO 17132 (T-bend), ISO 1520 (cupping test)

EN ISO 1519:2011 is essential when you need repeatable, internationally recognized data on coating flexibility and adhesion under bending stresses using the cylindrical mandrel method.