SIST EN ISO 6272-1:2011 PDF

Overview

EN ISO 6272-1:2011 - Paints and varnishes: Rapid-deformation (impact resistance) tests - Part 1: Falling-weight test, large-area indenter (ISO 6272-1:2011) specifies a laboratory method to evaluate a dry coating’s resistance to cracking or peeling when subjected to a rapid deformation produced by a falling weight. The test uses a 20 mm diameter spherical indenter and can be applied as a pass/fail check or as a classification test to determine the minimum drop height and/or mass that causes coating failure. Note: the apparatus produces rapid deformation rather than a true high‑velocity impact.

Key topics and technical requirements

• Principle: A coated test panel is deformed by a falling weight; visual inspection (×10 magnifier) reveals cracking or peeling.
• Apparatus essentials:
  • Spherical indenter: (20 ± 0.3) mm diameter.
  • Falling weights: nominally 1 000 ± 10 g or 2 000 ± 20 g (additional masses allowed up to 4 kg total).
  • Vertical guide tube with clearance (0.7 ± 0.2) mm and graduation for drop height.
  • Ring die: inner diameter (27 ± 0.3) mm, rounded upper edge radius (0.9 ± 0.2) mm, minimum height 20 mm.
  • Clamping sleeve, stops to limit indentation depth, and a ×10 viewing lens.
• Test specimen & conditioning:
  • Test panels: planar, ≥0.25 mm thick, conforming to ISO 1514.
  • Coating thickness measured per ISO 2808; film thickness variation must be ≤ ±10% of specified value.
  • Condition panels at (23 ± 2) °C and 50 ± 5% RH (or agreed alternative) for ≥16 h; begin tests promptly and complete within 30 minutes of removal from conditioning.
• Procedure:
  • Pass/fail: five drops at specified mass/height; coating satisfactory if ≥4 of 5 positions show no cracking/peeling.
  • Classification: increase drop height in 25 mm increments (and/or add mass) until failure is observed to determine threshold.

Applications and users

• Practical use: quality control, specification compliance, product development and comparative ranking of coatings for durability under rapid deformation.
• Typical users: coatings manufacturers, independent test laboratories, R&D teams, specifiers, procurement and QA personnel in industries such as industrial coatings, automotive, appliances, construction and metal fabrication where coated substrates may undergo mechanical deformation.

Related standards

• ISO 6272-2 - Falling-weight test, small-area indenter (companion method)
• ISO 1513, ISO 1514 - Sample preparation and standard test panels
• ISO 2808 - Film thickness measurement
• ISO 3270 - Conditioning (temperature and humidity)
• ISO 13076 - Lighting and visual assessment
• ISO 15528 - Sampling

Keywords: EN ISO 6272-1, falling-weight test, impact resistance, rapid-deformation tests, paints and varnishes, coating cracking, large-area indenter.