Overview
ISO 7784-1:2023 - "Paints and varnishes - Determination of resistance to abrasion - Part 1" specifies a laboratory test method to measure the abrasion resistance of coatings using two loaded, freely rotatable abrasive-paper covered wheels acting on a rotating test specimen. The method quantifies coating wear by measuring the mass loss after a defined number of cycles and is one part of the ISO 7784 series for abrasive-wheel abrasion testing.
Key topics and technical requirements
- Test principle: Two abrasive-paper covered rubber wheels press against a rotating specimen with an eccentric arrangement, producing a ring-shaped wear zone; mass loss is measured after testing.
- Apparatus: Turntable abrasion tester with two pivoting arms, ball-bearing mandrels, and a suction device for dust removal. Key parameters:
- Turntable speed: 60 ± 2 min⁻¹
- Offset between wheel axis and specimen axis: 19.05 ± 0.3 mm
- Suction distance from specimen: (3 ± 1) mm
- Balance accuracy: 0.1 mg
- Abrasive wheels:
- Rubber wheel dimensions: diameter 50.5 ± 0.5 mm, thickness 12.7 ± 0.2 mm, axial bore 16.0 ± 0.1 mm
- Abrasive paper: self-adhesive strips 12.7 ± 0.2 mm wide (min. length 160 mm; 173 mm if cut at 45°). Grain sizes per FEPA 43-1 / 43-2.
- Rubber hardness and abrasive grain selection are agreed between parties.
- Test loads: Apparatus provides a minimum load (~2.5 N per arm) and additional weights allow ~4.9 N and 9.8 N per arm. Agreed test load must be specified.
- Specimens and conditioning:
- Test panels: plane specimens ≥ 100 × 100 mm, prepared per ISO 1514.
- Film thickness: measured per ISO 2808.
- Conditioning: 23 ± 2 °C, 50 ± 5 % RH for at least 16 h (ISO 3270).
- Procedure and reporting:
- Replace abrasive paper for each single determination.
- Perform triplicate determinations on separate specimens.
- Report mass loss, test parameters (abrasive type, load, cycles, environmental conditions).
Applications and users
- Practical for coating manufacturers, quality control labs, R&D teams, and third‑party testing facilities evaluating coating durability, comparative product performance, or formulation changes.
- Useful across industries: automotive, industrial protective coatings, flooring, marine, and consumer goods where abrasion resistance is critical.
- Helps specify materials, validate claims, support product development, and ensure compliance with contract or procurement requirements.
Related standards
Keywords: ISO 7784-1:2023, resistance to abrasion, paints and varnishes, abrasive-paper covered wheels, rotating test specimen, turntable abrasion tester, abrasion testing, coating durability.