ISO 20567-1-2017 PDF

Full title and description

Paints and varnishes — Determination of stone‑chip resistance of coatings — Part 1: Multi‑impact testing. This International Standard specifies three methods for evaluating the resistance of automobile finishes and other coatings to chilled‑iron grit projected onto the surface to simulate the impact of small stones (multi‑impact test methods and apparatus requirements).

Abstract

ISO 20567‑1:2017 defines multi‑impact procedures for assessing stone‑chip resistance of coatings using chilled‑iron grit. The standard describes test apparatus, grit specifications, test conditions (three methods with defined pressures, quantities and durations), calibration and evaluation criteria to produce repeatable, comparable results for quality control and R&D of coatings.

General information

• Status: Published (confirmed on periodic review).
• Publication date: January 2017 (Edition 2, 2017‑01).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 87.040 (Paints and varnishes).
• Edition / version: 2 (2017).
• Number of pages: 12 (PDF/print edition typically 12 pages).

Scope

Specifies three multi‑impact test methods for assessing the resistance of coatings (notably automotive finishes) to projection of chilled‑iron grit. The procedures cover apparatus design, grit characteristics, test-panel preparation, test conditions (pressure, mass of grit, number of projections) and evaluation of damage to enable consistent laboratory simulation of stone impacts. The standard replaces the earlier 2005 edition.

Key topics and requirements

• Test principle: projection of chilled‑iron grit onto coated panels to simulate small‑stone impacts (multi‑impact sequence).
• Apparatus: multi‑impact tester with grit‑accelerating nozzle and vibrating conveyor; calibration procedures specified.
• Grit specification: chilled‑iron grit with defined particle size distribution and handling/replacement rules.
• Three prescribed methods (A, B, C) with defined working pressures, grit mass and number/duration of projections to cover different severities.
• Panel preparation, conditioning and coating‑thickness requirements to ensure reproducible results.
• Evaluation: procedures for removing loose fragments and quantifying delaminated/damaged area to classify resistance.
• Precision and repeatability information and requirements for reporting test conditions and results.

Typical use and users

Used by coating formulators, automotive OEMs, component suppliers, independent test laboratories and quality/control departments to evaluate and compare stone‑chip resistance during product development, specification compliance and production quality checks. The test is particularly relevant for vehicle exterior finishes and other coatings exposed to road debris.

Related standards

ISO 20567 is a multipart series. Relevant related documents include: ISO 20567‑2 (Single‑impact test with a guided impact body — updated 2023) and ISO 20567‑3 (Single‑impact test with a free‑flying impact body — 2012). In practice, ISO 11124‑2 (specification for chilled‑iron grit abrasives) and standards for test panels and surface preparation (for example ISO 1513 / ISO 1514 or national equivalents) are commonly referenced when performing ISO 20567 tests.

Keywords

stone‑chip resistance, multi‑impact testing, chilled‑iron grit, paints and varnishes, coatings, automotive finishes, impact testing, ISO 20567‑1.

FAQ

Q: What is this standard?

A: ISO 20567‑1:2017 is the part of the ISO 20567 series that specifies laboratory multi‑impact methods for determining the stone‑chip resistance of coatings (projected chilled‑iron grit tests).

Q: What does it cover?

A: It covers apparatus requirements, grit specification, three multi‑impact test methods (different severities), panel preparation, calibration, testing procedure, evaluation of damage, and precision/ reporting guidance to allow reproducible assessment of coating resistance to small‑stone impacts.

Q: Who typically uses it?

A: Automotive paint and coating manufacturers, vehicle OEMs, component suppliers, independent testing laboratories and R&D/quality engineers use this standard for product development, specification compliance and QA testing.

Q: Is it current or superseded?

A: The 2017 edition (Edition 2, 2017‑01) is published and was confirmed on review; it replaced the 2005 edition. Users should check national adoption/confirmation status periodically for updates.

Q: Is it part of a series?

A: Yes — ISO 20567 is a multipart series. Part 1 covers multi‑impact testing; Part 2 covers single‑impact testing with a guided impact body (latest revision 2023); Part 3 covers single‑impact testing with a free‑flying impact body (2012).

Q: What are the key keywords?

A: Stone‑chip resistance, multi‑impact, chilled‑iron grit, coatings durability, paints and varnishes, impact testing, automotive finishes (ISO 20567‑1).