ISO 22785-6
(Main)Paints and varnishes — Coatings on plastics and composites — Part 6: Stone-chip resistance testing
Paints and varnishes — Coatings on plastics and composites — Part 6: Stone-chip resistance testing
This document gives an overview on the testing of the stone-chip resistance of coatings on plastics, plastics composites and similar substrates. Stone-chip resistance is usually assessed through surface tests, but nonetheless the substrate has an influence and is considered.
Titre manque — Partie 6: Titre manque
General Information
- Status
- Not Published
- Technical Committee
- ISO/TC 35/SC 9 - General test methods for paints and varnishes
- Drafting Committee
- ISO/TC 35/SC 9/WG 31 - Properties after application
- Current Stage
- 6000 - International Standard under publication
- Start Date
- 09-May-2026
- Completion Date
- 16-May-2026
Overview
ISO 22785-6: Paints and varnishes - Coatings on plastics and composites - Part 6: Stone-chip resistance testing provides a comprehensive framework for assessing the performance of coatings applied to plastics, plastics composites, and similar substrates when subjected to stone-chip impacts. Developed by the International Organization for Standardization (ISO), this standard addresses the unique characteristics of non-metallic substrates, such as their flexibility and hardness, and the influence these have on coating durability under real-world conditions.
Stone-chip resistance is a key property for coatings used in automotive, transportation, electronics, and industrial applications. The standard outlines methods to simulate and evaluate damage caused by impacts from road chippings or debris, ensuring coatings maintain integrity and performance.
Key Topics
- Scope: Defines requirements for testing stone-chip resistance on coatings applied to plastic and composite substrates.
- Substrate Influence: Highlights how substrate characteristics like flexibility and hardness influence test results, and points out differences from metallic substrates.
- Test Sample Preparation:
- Specific guidance on test panel geometry, surface quality, and film thickness documentation.
- Conditioning procedures to improve test repeatability, considering plastics’ sensitivity to humidity and temperature.
- Testing Methods:
- Stationary Multi-Impact Test: Uses many sharp-edged impact bodies (e.g., iron grit) for repeated impacts (see ISO 20567-1).
- Single-Impact Test with Guided Impact Body: Involves a controlled, wedge-shaped impact for focused damage assessment (see ISO 20567-2).
- Single-Impact Test with Free-Flying Impact Body: Evaluates coating resistance using a projectile under specified angle and speed (see ISO 20567-3).
- Test Conditions: Recommends temperature control and standard conditioning to ensure consistent, meaningful results.
- Evaluation: Damage assessment is done visually or with measurement tools, and may require enhancement techniques for low-contrast substrates.
Applications
ISO 22785-6 is relevant wherever coatings on plastics and composites must withstand stone or debris impact, including:
- Automotive industry: Assessment of exterior coatings on bumpers, trims, mirror housings, and plastic body panels for stone-chip resistance.
- Industrial equipment: Protection of composite panels or housings in machinery exposed to harsh environments.
- Consumer goods: Ensures surface durability of coated plastic products subject to impact during use or transport.
- Electronics & appliances: Verification of finishes on plastic enclosures to ensure long-term cosmetic and protective performance.
Adhering to ISO 22785-6 improves quality assurance, supports product development, and helps meet regulatory or customer requirements for coated plastics and composites.
Related Standards
ISO 22785-6 is part of the broader ISO 22785 series addressing coatings on plastics and composites. Key related standards include:
- ISO 22785-1: General introduction to coatings on plastics and composites.
- ISO 20567-1: Multi-impact testing procedure for stone-chip resistance.
- ISO 20567-2: Single-impact testing with a guided impact body.
- ISO 20567-3: Single-impact testing with a free-flying impact body.
- ISO 20567-4: Mobile multi-impact testing on small testing areas.
- ISO 1514: Standard panels for testing paints and varnishes.
- ISO 3270: Conditioning samples for temperature and humidity control.
- ISO 4618: Vocabulary for paints and varnishes.
These documents provide comprehensive guidance for the preparation, execution, and evaluation of coating performance on plastics and composites, facilitating consistent and reliable results across industries.
Keywords: stone-chip resistance, coatings on plastics, plastics composites, ISO 22785-6, paint testing, surface durability, impact testing, automotive coatings, test procedures, standardization.
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ISO/PRF 22785-6 - Paints and varnishes — Coatings on plastics and composites — Part 6: Stone-chip resistance testing
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ISO/PRF 22785-6 - Paints and varnishes — Coatings on plastics and composites — Part 6: Stone-chip resistance/16/2025
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Frequently Asked Questions
ISO 22785-6 is a draft published by the International Organization for Standardization (ISO). Its full title is "Paints and varnishes — Coatings on plastics and composites — Part 6: Stone-chip resistance testing". This standard covers: This document gives an overview on the testing of the stone-chip resistance of coatings on plastics, plastics composites and similar substrates. Stone-chip resistance is usually assessed through surface tests, but nonetheless the substrate has an influence and is considered.
This document gives an overview on the testing of the stone-chip resistance of coatings on plastics, plastics composites and similar substrates. Stone-chip resistance is usually assessed through surface tests, but nonetheless the substrate has an influence and is considered.
ISO 22785-6 is classified under the following ICS (International Classification for Standards) categories: 83.080.01 - Plastics in general; 83.120 - Reinforced plastics; 87.040 - Paints and varnishes. The ICS classification helps identify the subject area and facilitates finding related standards.
ISO 22785-6 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
International
Standard
First edition
Paints and varnishes — Coatings on
plastics and composites —
Part 6:
Stone-chip resistance testing
PROOF/ÉPREUVE
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test sample characteristics and preparation . 1
4.1 Test samples .1
4.2 Conditioning.2
5 Influence of the plastics substrate on the stone-chip resistance test. 2
6 Overview of test methods . 2
6.1 Test temperature .2
6.2 Stationary multi-impact test .2
6.3 Single-impact test with guided impact body .3
6.4 Single-impact test with a free-flying impact body .4
7 Evaluation . 5
Bibliography . 6
PROOF/ÉPREUVE
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
A list of all parts in the ISO 22785 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
PROOF/ÉPREUVE
iv
Introduction
The ISO 22785 series explains the characteristics of plastics and the differences between plastics substrates
and metallic substrates.
Stone-chip resistance is usually assessed through surface tests; nonetheless, the substrate also has an
influence on the stone-chip resistance of the coating and is considered when testing stone-chip resistance.
Impacts due to loose chippings on a road surface or other materials can cause damage to paint finishes. Such
damage can result in single layers or all layers flaking off from the substrate.
Stone-chip damage can be replicated with single-impact and multi-impact test procedures. ISO 20567-1 and
ISO 20567-4 describe multi-impact test procedures, while ISO 20567-2 and ISO 20567-3 describe single-
impact test procedures.
Many of the existing test procedures for coatings have been developed for metallic substrates, and in the
past they have often also been applied to plastics substrates.
PROOF/ÉPREUVE
v
International Standard ISO 22785-6:2026(en)
Paints and varnishes — Coatings on plastics and
composites —
Part 6:
Stone-chip resistance testing
1 Scope
This document specifies the testing of the stone-chip resistance testing of coatings on plastics, plastics
composites and similar substrates, hereinafter collectively referred to as plastics.
This document shows the potential effect of plastics on the behaviour of the coating during stone-chip
resistance testing.
2 Normative references
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PROOF
ISO/DIS PRF 22785--6:20252026(en) Formatted: Font: Bold
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Formatted: Font: Bold
Formatted: HeaderCentered, Left
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication
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may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying,
Formatted: Adjust space between Latin and Asian text,
or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO
Adjust space between Asian text and numbers
at the address below or ISO’s member body in the country of the requester.
Formatted: Right: 1.5 cm, Top: 1.4 cm, Bottom: 1 cm,
Gutter: 0 cm, Header distance from edge: 1.27 cm, Footer
ISO copyright office
distance from edge: 0.5 cm
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
EmailE-mail: copyright@iso.org
Formatted: German (Germany)
Website: www.iso.orgwww.iso.org
Formatted: German (Germany)
Published in Switzerland
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iii
ISO /PRF 22785--6:2025 (E2026(en) Formatted: Font: Bold
Formatted: Font: Bold
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Contents
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Foreword . v
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Introduction . vi
at 0.71 cm
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test sample characteristics and preparation . 1
4.1 Test samples . 1
4.2 Conditioning . 2
5 Influence of the plastics substrate on the stone-chip resistance test . 2
6 Overview of test methods . 2
6.1 Test temperature . 2
6.2 Stationary multi-impact test . 2
6.3 Single-impact test with guided impact body . 3
6.4 Single-impact test with a free-flying impact body . 6
7 Evaluation . 9
Bibliography . 10
Foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test sample characteristics and preparation . 5
4.1 Test samples . 5
4.2 Conditioning . 6
5 Influence of the plastics substrate on the stone-chip resistance test . 6
6 Overview of test methods . 6
6.1 Test temperature . 6
6.2 Stationary multi-impact test as specified in ISO 20567-1 . 6
6.3 Single-impact test with guided impact body as specified in ISO 20567-2 . 7
6.4 Single-impact test with a free-flying impact body as specified in ISO 20567-3 . 8
7 Evaluation . 9
Bibliography 10
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After: 0 pt
iv
ISO/DIS PRF 22785--6:20252026(en) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Font: Bold
Foreword
Formatted: Font: Bold
Formatted: HeaderCentered, Left
ISO (the International Organization for Standardization) is a worldwide federation of national standards
Formatted: Adjust space between Latin and Asian text,
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
Adjust space between Asian text and numbers
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives). Formatted: English (United Kingdom)
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html. Formatted: English (United Kingdom)
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
General test methods for paints and varnishes.
A list of all parts in the ISO 22785 series can be found on the ISO website. Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
Any feedback or questions on this document should be directed to the user’s national standards body. A
Formatted: Default Paragraph Font
complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
Formatted: English (United Kingdom)
Formatted: English (United Kingdom)
Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
Formatted: Font: 10 pt
Formatted: Font: 10 pt
Formatted: FooterCentered, Left, Space Before: 0 pt, Tab
stops: Not at 17.2 cm
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pt, Tab stops: Not at 17.2 cm
v
ISO /PRF 22785--6:2025 (E2026(en) Formatted: Font: Bold
Formatted: Font: Bold
Formatted: Font: Bold
Introduction Formatted: Font: Bold
Formatted: HeaderCentered
The ISO 22785 series explains the characteristics of plastics and the differences between plastics substrates
and metallic substrates.
Stone-chip resistance is usually assessed through surface tests, but; nonetheless, the substrate also has an Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
influence on the stone-chip resistance of the coating and is considered when testing stone-chip resistance.
Impacts due to loose chippings on a road surface or other materials can cause damage to paint finishes. Such
damage can result in single layers or all layers flaking off from the substrate.
Stone-chip damage can be replicated with single-impact and multi-impact test procedures. ISO 20567--1 and Formatted: Default Paragraph Font
ISO 20567--4 describe multi--impact test procedures, while ISO 20567--2 and ISO 20567--3 describe single-
Formatted: Default Paragraph Font
impact test procedures.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
Many of the existing test procedures for coatings have been developed for metallic substrates, and in the past
Formatted: Default Paragraph Font
they have often also been applied to plastics substrates.
Formatted: Default Paragraph Font
This document explains the characteristics of plastics and the differences between plastics substrates and
Formatted: Default Paragraph Font
metallic substrates. It also shows the potential effect of plastics on the behaviour of the coating in different
Formatted: Default Paragraph Font
test procedures.
Formatted: Default Paragraph Font
Formatted: Default Paragraph Font
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Formatted: FooterPageRomanNumber, Space Before: 0 pt,
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vi
DRAFT International Standard ISO/DIS 22785-6:2025(en)
Paints and varnishes — Coatings on plastics and composites —
Formatted: Main Title 2
Part 6:
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Stone-chip resistance testing
Gutter: 0 cm, Header distance from edge: 1.27 cm, Footer
distance from edge: 0.5 cm
1 Scope Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
This document specifies the testing of the stone-chip resistance testing of coatings on plastics, plastics
composites and similar substrates, hereinafter collectively referred to as plastics.
This document shows the potential effect of plastics on the behaviour of the coating during stone-chip Formatted: Adjust space between Latin and Asian text,
Adjust space between Asian text and numbers
resistance testing.
2 Normative references
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Formatted: Default Paragraph Font
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references, Formatted: Default Paragraph Font
the latest edition of the referenced document (including any amendments) applies.
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at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm + 3.5 cm + 4.2 cm +
ISO 4618, Paints and varnishes — Vocabulary
4.9 cm + 5.6 cm + 6.3 cm + 7 cm
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ISO 22785--1,
...
DRAFT
International
Standard
ISO/DIS 22785-6
ISO/TC 35/SC 9
Coatings on plastics and
Secretariat: BSI
composites —
Voting begins on:
Part 6: 2025-09-10
Stone-chip resistance
Voting terminates on:
2025-12-03
ICS: 87.040; 83.080.01; 83.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
This document has not been edited by the ISO Central Secretariat.
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 22785-6:2025(en)
DRAFT
ISO/DIS 22785-6:2025(en)
International
Standard
ISO/DIS 22785-6
ISO/TC 35/SC 9
Coatings on plastics and
Secretariat: BSI
composites —
Voting begins on:
Part 6:
Stone-chip resistance
Voting terminates on:
ICS: 87.040; 83.080.01; 83.120
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2025
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
This document has not been edited by the ISO Central Secretariat. BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
CP 401 • Ch. de Blandonnet 8
TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 22785-6:2025(en)
ii
ISO/DIS 22785-6:2025(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test sample characteristics and preparation . 1
4.1 Test samples .1
4.2 Conditioning.2
5 Influence of the plastics substrate on the stone-chip resistance test. 2
6 Overview of test methods . 2
6.1 Test temperature .2
6.2 Stationary multi-impact test as specified in ISO 20567-1 .2
6.3 Single-impact test with guided impact body as specified in ISO 20567-2 .3
6.4 Single-impact test with a free-flying impact body as specified in ISO 20567-3 .4
7 Evaluation . 5
Bibliography . 7
iii
ISO/DIS 22785-6:2025(en)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
A list of all parts in the ISO 22785 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/DIS 22785-6:2025(en)
Introduction
Impacts due to loose chippings on a road surface or other materials can cause damage to paint finishes. It is
possible for single layers or all layers to flake off from the substrate.
Stone-chip damage can be replicated with single-impact and/or multi-impact test procedures. ISO 20567-1
and ISO 20567-4 describe multi-impact test procedures, ISO 20567-2 and ISO 20567-3 describe single-impact
test procedures.
Many of the existing test procedures for coatings have been developed for metallic substrates, and in the
past they have often also been applied to plastics substrates.
This
...