National foreword

This British Standard is the UK implementation of EN ISO 11998:2006. It supersedes BS EN ISO 11998:2001 which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007

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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 11998 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

This second edition cancels and replaces the first edition (ISO 11998:1998), which has been technically revised. The main changes are:

the definitions for stroke length and scrub cycle have been changed and a new term scrub length has been introduced;
the method for the determination of the dry-film density of the coating, specified in Annex A, has been replaced by a new method.

Introduction

As noted in the Foreword, this International Standard is a revision of ISO 11998:1998. The use and application of the standard is now established globally, and improved procedures/equipment have been proposed. A joint CEN/ISO working group has agreed to undertake interlaboratory testing with a new type of abrasive pad (different from that specified in 6.5). It is anticipated that the results of the testing will be available by the end of 2006 and an early revision of the standard might be initiated.

Foreword

This document (EN ISO 11998:2006) has been prepared by Technical Committee ISO/TC 35 "Paints and varnishes" in collaboration with Technical Committee CEN/TC 139 "Paints and varnishes", the secretariat of which is held by DIN.

This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2007, and conflicting national standards shall be withdrawn at the latest by January 2007.

This document supersedes EN ISO 11998:2001.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice

The text of ISO 11998:2006 has been approved by CEN as EN ISO 11998:2006 without any modifications.

1 Scope

The ability of coatings to withstand wear caused by repeated cleaning operations and to withstand penetration by soiling agents is an important consideration both from a practical point of view and when comparing and rating such coatings. This International Standard describes an accelerated method for the determination of wet-scrub resistance. With regard to the cleanability of coatings, only the method itself and not the soiling agents are specified.

NOTE Since these properties depend not only on the quality of a coating but also on the substrate, the method of application, the drying conditions and other factors, the results obtained are not directly transferable to actual practice. In this standard the evaluation of the coating is based on a defined substrate, a fixed application method, specified drying conditions and a defined method of wet scrubbing.

2 Normative references

3 Terms and definitions

4 Principle

4.1 Wet-scrub resistance

4.2 Cleanability

5 Reagents

5.1 Washing liquid

5.2 Soiling agents

6 Apparatus

6.1

6.2

6.3

6.4

6.5

6.6

6.7

7 Sampling

8 Procedure

8.1 Film application

8.2 Wet-scrub resistance

8.3 Cleanability

9 Expression of results

9.1 Calculation of the loss in coating mass per unit area

9.2 Calculation of mean loss in film thickness

9.3 Assessment of wet-scrub resistance

9.4 Assessment of cleanability

10 Precision

10.1 General

10.2 Repeatability

10.3 Reproducibility

11 Test report

Bibliography

BS EN ISO 11998:2006

Paints and varnishes. Determination of wet-scrub resistance and cleanability of coatings

Current, Under Review

Published:

31 Aug 2007