Paints and varnishes — Determination of resistance to abrasion — Part 3: Method with abrasive-paper covered wheel and linearly reciprocating test specimen

This document specifies a method for determining the resistance to abrasion of coatings, for which a loaded, rigid abrasive-paper covered wheel affects the coating of the linearly reciprocating test specimen.

Peintures et vernis — Détermination de la résistance à l'abrasion — Partie 3: Méthode utilisant une roue revêtue de papier abrasif et une éprouvette animée d'un mouvement de va-et-vient linéaire

ISO 7784-3:2016 spécifie une méthode permettant de déterminer la résistance à l'abrasion des revêtements en appliquant une roue rigide et chargée, revêtue de papier abrasif, sur le revêtement d'une éprouvette animée d'un mouvement de va-et-vient linéaire.

General Information

Status
Published
Publication Date
15-Sep-2022
Current Stage
6060 - International Standard published
Due Date
30-Jun-2023
Completion Date
16-Sep-2022
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ISO 7784-3:2022 - Paints and varnishes — Determination of resistance to abrasion — Part 3: Method with abrasive-paper covered wheel and linearly reciprocating test specimen Released:16. 09. 2022
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INTERNATIONAL ISO
STANDARD 7784-3
Third edition
2022-09
Paints and varnishes — Determination
of resistance to abrasion —
Part 3:
Method with abrasive-paper covered
wheel and linearly reciprocating test
specimen
Peintures et vernis — Détermination de la résistance à l'abrasion —
Partie 3: Méthode utilisant une roue revêtue de papier abrasif et une
éprouvette animée d'un mouvement de va-et-vient linéaire
Reference number
ISO 7784-3:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 7784-3:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 7784-3:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 S c op e ................................................................................................................................................................................................................................. 1

2 Nor m at i ve r ef er enc e s ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 P r i nc iple ........................................................................................................................................................................................................................ 2

5 Apparatus and materials ............................................................................................................................................................................3

6 Te s t s p e c i men s ....................................................................................................................................................................................................... 4

6.1 P reparation of test specimens .................................................................................................................................................. 4

6 . 2 F i l m t h ic k ne s s ......................................................................................................................................................................................... 5

6 . 3 C ond it ion i n g.............................................................................................................................................................................................. 5

7 P r o c e du re ....................................................................................................................................................................................................................5

7.1 A g r e ement s ............................................................................................................................................................................................... 5

7.2 Preparation of the abrasive wheel ........................................................................................................................................ 5

7. 3 Te s t c ond it ion s ........................................................................................................................................................................................ 5

7.4 N umber of determinations .......................................................................................................................................................... 5

7.5 G eneral test procedure .................................................................................................................................................................... 5

7.6 P rocedure of the pre-test .............................................................................................................................................................. 6

7.7 P rocedure of the main test .......................................................................................................................................................... 6

8 E valuation of the main test .......................................................................................................................................................................6

8.1 L oss in mass by abrasion ............................................................................................................................................................... 6

8 . 2 A br a s ion r e s i s t a nc e ......... .................................................................................................................................. ................................. 7

9 P r e c i s ion ....................................................................................................................................................................................................................... 7

9.1 G eneral ........................................................................................................................................................................................................... 7

9.2 R epeatability limit ............................................................................................................................................................................... 7

9.3 R eproducibility limit ......................................................................................................................................................................... 7

10 Te s t r ep or t .................................................................................................................................................................................................................. 8

Bibliography ................................................................................................................................................................................................................................ 9

iii
© ISO 2022 – All rights reserved
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ISO 7784-3:2022(E)
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, in collaboration with the European Committee for

Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the

Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 7784-3:2016), which has been technically

revised.
The main changes are as follows:
— details of the materials for the precision data have been added in Table 2;
— ISO 7823-1 has been moved from Clause 2 to the Bibliography;

— the percentage of the repeatability and reproducibility limits have been removed from 9.2 and 9.3,

respectively.
A list of all parts in the ISO 7784 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.
© ISO 2022 – All rights reserved
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ISO 7784-3:2022(E)
Introduction

This document is one of the three parts of the ISO 7784 series dealing with test methods for the

determination of the resistance to abrasion of coatings using abrasive wheels. The characteristics and

differences of these methods are summarized in Table 1.
Table 1 — Types of method
Abrasive wheel
Test specimen
Standard
movement
Type Degree of freedom
Abrasive paper on
ISO 7784-1
rubber wheel
Freely rotatable Rotation
ISO 7784-2 Abrasive rubber wheel
Rigid – with
Abrasive paper on
ISO 7784-3 stroke-dependent Linear reciprocation
metal wheel
rotation

A mechanism rotates the abrasive wheel by a small angle after each double stroke so that a new area of the abrasive

paper is effective.

It is preferable that the methods using abrasive-paper covered wheels (ISO 7784-1 and ISO 7784-3) are

applied.
© ISO 2022 – All rights reserved
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INTERNATIONAL STANDARD ISO 7784-3:2022(E)
Paints and varnishes — Determination of resistance to
abrasion —
Part 3:
Method with abrasive-paper covered wheel and linearly
reciprocating test specimen
1 S cope

This document specifies a method for determining the resistance to abrasion of coatings, for which

a loaded, rigid abrasive-paper covered wheel affects the coating of the linearly reciprocating test

specimen.
2 Normat ive references

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, the latest edition of the referenced document (including any amendments) applies.

ISO 1514, Paints and varnishes — Standard panels for testing
ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning

and testing
ISO 4618, Paints and varnishes — Terms and definitions
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
test specimen
panel on which the test is to be carried out

[SOURCE: ISO 7784-1:2016, 3.1, modified — in the definition "specimen" has been replaced by "panel"]

3.2
double stroke
complete reciprocal movement made by the abrasive wheel
© ISO 2022 – All rights reserved
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ISO 7784-3:2022(E)
3.3
repeatability conditions

conditions where independent test results are obtained with the same method on identical test items

in the same laboratory by t
...

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