ISO 20567-4-2023 PDF

Full title and description

Paints and varnishes — Determination of stone-chip resistance of coatings — Part 4: Mobile multi-impact testing on a small testing area. This International Standard specifies a mobile method for evaluating the resistance of automotive finishes and other coatings to chilled-iron grit projected onto a confined test area to simulate the effect of stone chipping.

Abstract

ISO 20567-4:2023 defines a mobile multi-impact test carried out on a small, defined test window. The method uses chilled-iron grit projected by a portable tester to produce localized stone-chip damage; subsequent removal of loose fragments and visual rating against pictorial reference standards provides a reproducible score of stone-chip resistance. Results from this method are explicitly not directly comparable with results from ISO 20567-1.

General information

• Status: Published
• Publication date: 16 March 2023
• Publisher: International Organization for Standardization (ISO)
• ICS / categories: 87.040 — Paints and varnishes
• Edition / version: Edition 1 (2023)
• Number of pages: 11

Scope

ISO 20567-4:2023 specifies a mobile procedure for assessing the resistance of coatings (primarily automotive finishes) to impact damage caused by small stones. The standard covers required apparatus and materials (including chilled-iron grit), test preparation, the projection procedure on a small test area, removal of loose fragments, visual evaluation using normative pictorial references and reporting requirements. The method is intended for localized, comparative testing rather than whole-panel endurance testing; results are not comparable with ISO 20567-1 methods.

Key topics and requirements

• Test principle: projection of chilled-iron grit onto a confined test window using a mobile stone‑chip tester to simulate stone impacts.
• Grit specification and sampling: particulate requirements and particle-count checks for the chilled-iron grit used in testing.
• Apparatus and setup: portable stone-chip tester, dosing device, compressed-air supply, projection mask and calibration equipment.
• Test procedure: defined dose quantities, number of projections, replacement intervals for grit and methods for removing detached fragments prior to evaluation.
• Evaluation and scoring: visual comparison against pictorial reference standards with a defined rating scale (typically 0–4) and clear inclusion/exclusion criteria for types of damage.
• Reporting: mandatory details for test reports, including coating identification, substrate preparation, film thickness, test conditions, grit details, evaluation images/references and any deviations.
• Normative annexes: pictorial reference standards and guidance on fragment removal and evaluation practices.

Typical use and users

This standard is used by automotive OEMs, vehicle refinish and coatings manufacturers, independent test laboratories, quality-control departments, materials R&D groups and suppliers of stone‑chip testing equipment. It is suitable for comparative product evaluation, supplier acceptance testing and research into coating formulations and application processes where a compact, portable test is required.

Related standards

ISO 20567 series and related references, for example: ISO 20567-1 (Multi-impact testing — 2017), ISO 20567-2 (Single-impact test with a guided impact body — 2023), ISO 20567-3 (Single-impact test with a free-flying impact body — 2012). Additional referenced standards commonly used alongside ISO 20567-4 include ISO 11124-2 and ISO 11125-2 (abrasive/grit specifications and sampling), ISO 565 (sieving/particle-size determination) and ISO 2808 (film thickness measurement). Regional/adopted versions (EN/BSI/ÖNORM) exist where ISO 20567-4 has been published as an identical regional standard.

Keywords

stone‑chip resistance, mobile multi‑impact, chilled‑iron grit, coatings testing, automotive finishes, portable stone‑chip tester, visual rating, ISO 20567, impact testing

FAQ

Q: What is this standard?

A: ISO 20567-4:2023 is an international test method that specifies a mobile multi‑impact procedure to assess the resistance of coatings—mainly automotive finishes—to stone‑chip damage on a small, defined test area.

Q: What does it cover?

A: It covers apparatus and material requirements (including chilled‑iron grit), the test procedure for projecting grit onto a small test window, methods for removing loose fragments, visual evaluation using pictorial references, and required content of the test report.

Q: Who typically uses it?

A: Automotive manufacturers and suppliers, paint and refinish manufacturers, independent test houses, quality-control and R&D teams use this standard for comparative evaluation and acceptance testing of coatings.

Q: Is it current or superseded?

A: ISO 20567-4:2023 is a current International Standard published in March 2023 (Edition 1). It is not superseded; users should check for any later amendments or regional adoptions when required.

Q: Is it part of a series?

A: Yes. It is part of the ISO 20567 series on determination of stone‑chip resistance; other parts cover alternative impact test methods (for example ISO 20567-1, -2 and -3).

Q: What are the key keywords?

A: stone‑chip resistance, chilled‑iron grit, mobile tester, multi‑impact, coatings testing, automotive finishes, visual rating.