ISO 11998-2006 “Determination of moisture-rub Resistance and cleanability of paint and varnish coatings”

A Preface
ISO (International Organization for Standardization) is a global alliance of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member institution interested in a subject on which a technical committee has been established has the right to be represented in the committee. Government and non-governmental international organizations that liaize with standardization organizations are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

International standards are drafted according to the rules given in Part 2 of the ISO/IEC Directive.

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Please note that certain contents of this document may be subject to patent rights. ISO is not responsible for identifying any or all such patent rights.

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

The second edition eliminates and replaces the technically revised first edition (ISO 11998:1998). The main changes are:

– The definitions of trip length and scrubbing cycle have been changed and a new term scrubbing length has been introduced;

— The coating dry film density determination method specified in Appendix A has been replaced by the new method.

ISO 11998-2006 “Determination of moisture-rub Resistance and cleanability of paint and varnish coatings”

As stated in the introduction, this international standard is a revised version of ISO 11998:1998. The use and application of the standard has now been established worldwide and improved procedures/equipment have been proposed. The CEN/ISO Joint Working Group has approved the use of new grinding pads (different from those specified in 6.5) for inter-laboratory testing. The results of the tests are expected to be published by the end of 2006 and an early revision of the standard may begin.

1 Scope
The ability of the coating to withstand wear caused by repeated cleaning operations and to withstand the penetration of fouling agents is an important consideration from a practical point of view as well as from the point of view of comparing and rating such coatings. This standard describes an accelerated method for determining resistance to wet scrubbing. With regard to the cleanability of the paint, only the method itself is specified, not the fouling agent.

Note that since these properties depend not only on the quality of the coating, but also on the substrate, application method, drying conditions and other factors, the obtained results cannot be directly transferred to actual practice. In this standard, coatings are evaluated based on defined substrates, fixed application methods, specified drying conditions and defined wet scrubbing methods.

ISO 11998-2006 “Determination of moisture-rub Resistance and cleanability of paint and varnish coatings”

2 Normative references
The following references are required for the application of this document. For dated references, only the cited version applies. For undated references, the new version of the reference (including any revisions) applies.

ISO 1513, Paints and varnishes — Examination and preparation of test samples

ISO 3270, Paints and varnishes and their raw materials – temperature and humidity regulated and tested

ISO 3696, analytical laboratory water use – specifications and test methods

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

3.1 Cleanability

The dry coating can withstand the penetration of the fouling agent and be released from it by the cleaning process without removing more than the prescribed film thickness

3.2 Scrub cycle

A reciprocal movement of the scrub pad in both directions along the length of the scrub

3.3 Length of scrub

The stroke length plus the pad length

3.4 Trip Length

The distance traversed by the device in one stroke

3.5 Resistance to wet scrubbing

Ability of dry coated film to withstand a loss of less than the specified oil film thickness on average in the specified area when exposed to 200 wet scrubbing cycles

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