ISO/PRF 22785-6

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
• ICS: 83.080.01 - Plastics in general
• ICS: 83.120 - Reinforced plastics
• ICS: 87.040 - Paints and varnishes
• 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: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 10-Apr-2026
• Completion Date: 11-Apr-2026

Overview

ISO/PRF 22785-6: Paints and varnishes - Coatings on plastics and composites - Part 6: Stone-chip resistance provides a standardized approach to testing the stone-chip resistance of coatings applied to plastics, plastic composites, and similar materials. This standard is part of the ISO 22785 series and addresses the specific influences and challenges when assessing coating durability on non-metallic substrates. While stone-chip resistance has traditionally been evaluated using surface tests, ISO/PRF 22785-6 recognizes the significant role of the substrate’s characteristics in the overall resistance performance.

Ensuring accurate test results for coated plastics is crucial in industries such as automotive manufacturing, consumer goods, and industrial equipment, where coatings not only affect product appearance but also functional longevity.

Key Topics

• Scope and Importance: The standard focuses on the evaluation of stone-chip resistance for coatings on plastics and composites. It emphasizes that both the coating and the underlying substrate contribute to performance against stone-chip impact.
• Test Sample Preparation: Guidance is provided for selecting and preparing test samples, including the importance of homogeneous coatings and appropriate conditioning, especially considering plastics’ sensitivity to humidity and temperature.
• Influence of Substrate: Unlike metals, plastics and composites can vary significantly in hardness and flexibility, directly impacting the test outcomes. The standard highlights that results are not directly comparable between flexible and hard plastic substrates.
• Overview of Test Methods:
  • Stationary Multi-Impact Test (referencing ISO 20567-1): Involves exposing the coated sample to multiple impacts using iron grit, simulating real-world stone-chip damage.
  • Single-Impact Test with Guided Impact Body (ISO 20567-2): Utilizes a wedge-shaped blade to create a controlled impact, allowing for precise measurement of coating damage.
  • Single-Impact Test with Free-Flying Impact Body (ISO 20567-3): Involves launching a free-flying body at the surface, measuring resultant damage and separation in multilayer coatings.
• Evaluation Process: Damage and resistance are assessed according to standardized criteria, with attention to visual inspection challenges on plastics due to reduced color contrast compared to metal substrates.

Applications

ISO/PRF 22785-6 is highly relevant for:

• Automotive Industry: Ensuring exterior plastic body parts, such as bumpers and moldings, maintain their integrity and appearance after exposure to road debris.
• Consumer Electronics and Appliances: Validating the durability of coated plastic housings that may be subjected to mechanical impacts in use or transit.
• Industrial Equipment: Assessing protective coatings on enclosures and components made from plastics or composites.

Routine use of this standard helps manufacturers, suppliers, and quality assurance professionals to:

• Benchmark the stone-chip resistance of different coatings and substrate combinations.
• Meet regulatory or customer requirements for coated plastic components.
• Develop and select coating systems that perform well under real-world impact conditions.

Related Standards

For a comprehensive approach to testing and terminology in coatings on plastics and composites, consult the following relevant ISO standards:

• ISO 20567-1: Paints and varnishes - Determination of stone-chip resistance of coatings - Multi-impact testing
• ISO 20567-2: Paints and varnishes - Determination of stone-chip resistance of coatings - Single-impact test with guided impact body
• ISO 20567-3: Paints and varnishes - Determination of stone-chip resistance of coatings - Single-impact with free-flying impact body
• ISO 1514: Paints and varnishes - Standard panels for testing
• ISO 3270: Paints and varnishes - Conditioning and testing atmospheres
• ISO 22785-1: Coatings on plastics and composites - Part 1: General introduction
• ISO 4618: Paints and varnishes - Vocabulary

Utilizing ISO/PRF 22785-6 alongside these related standards supports consistent, reliable assessment of stone-chip resistance, fostering improved product development and quality assurance in coated plastic and composite materials.

Standards Content (Sample)

International
Standard
ISO 22785-6
First edition
Paints and varnishes — Coatings on
plastics and composites —
Part 6:
Stone-chip resistance testing
PROOF/ÉPREUVE
Reference number
ISO 22785-6:2026(en) © ISO 2026

ISO 22785-6:2026(en)
© 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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
PROOF/ÉPREUVE
ii
ISO 22785-6:2026(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 .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
ISO 22785-6:2026(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 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
ISO 22785-6:2026(en)
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
Formatted: Font: Bold
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
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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: [e-mail]
Formatted: German (Germany)
Website: www.iso.orgwww.iso.org
Formatted: German (Germany)
Published in Switzerland
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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
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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
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vi
DRAFT International Standard ISO/DIS 22785-6:2025(en)

Paints and varnishes — Coatings on plastics and composites —
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Part 6:
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Stone-chip resistance testing
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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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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: [phone]
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Email: [e-mail]
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
...