EN ISO 7784-2:2023 PDF

Overview

EN ISO 7784-2:2023 - "Paints and varnishes - Determination of resistance to abrasion - Part 2: Method with abrasive rubber wheels and rotating test specimen" - specifies a standardized laboratory method to measure the abrasion resistance of coatings. The test uses two loaded, freely rotatable, eccentrically mounted abrasive rubber wheels pressed onto a rotating test specimen (turntable). Abrasive wear is assessed by measuring the loss of coating mass after a defined number of cycles. This is the 2023 (third) edition and supersedes EN ISO 7784-2:2016.

Key topics and technical requirements

• Test principle: Two abrasive rubber wheels on pivoting arms contact a rotating specimen to produce a ring-shaped wear zone; mass loss after the agreed cycles is measured.
• Apparatus: Turntable abrasion tester with pivoting arms and mandrels using ball bearings; wheels mounted on mandrels and, if required, loaded by weights.
• Critical dimensions & settings (as given in the standard):
  • Turntable speed: (60 ± 2) min⁻¹.
  • Wheel offset (eccentricity): (19.05 ± 0.3) mm.
  • Abrasive wheel axial bore: (16.0 ± 0.1) mm.
  • Wear zone width: about 13 mm.
  • Dust extraction: suction device positioned (3 ± 1) mm from the specimen.
• Specimen preparation & conditioning: Film thickness measurement and conditioning requirements reference ISO 2808 and ISO 3270; film thickness and substrate preparation are specified.
• Abrasive media: Rubber discs containing abrasive granulate; reference to FEPA Standard 43-1 for abrasive grain grades.
• Procedure & evaluation: Number of cycles is pre-set; test records mass loss (abrasive wear) and includes precision and reporting requirements.

Applications and users

This method is used where quantifiable, repeatable abrasion resistance data are required to:

• Support quality control in coating manufacturers and formulation development.
• Compare performance for industrial, automotive, marine, protective, and architectural coatings.
• Provide data for material specifications, procurement, and compliance testing. Primary users: materials testing laboratories, R&D teams, QC engineers, standards writers, and product certifiers seeking reliable coating durability testing.

Related standards

• ISO 7784 series: Part 1 (abrasive paper on rubber wheel - rotating) and Part 3 (abrasive paper on metal wheel - reciprocating).
• Normative references cited: ISO 1514, ISO 2808, ISO 3270, ISO 4618, ISO 48-4/48-5, and FEPA Standard 43-1.

This standard provides a reproducible abrasion test method - essential for consistent evaluation of coating durability and comparative performance data.