preface
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This document has been prepared by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 9, Common Test Methods for Paints and varnishes.

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ISO 23169-2020 “Field test methods for quality assessment of paints and varnished interior wall Coatings”

introduce
A typical interior wall coating system (see Figure 1) consists of a thick filler, a coating primer, and two finishes. As a result, the final quality of the interior wall depends on the entire paint system from the filler to the primer to the top coat. In addition, the quality of the coating conditions, such as film thickness and paint water dilution rate, has a significant impact on the final wall coating system.

Figure 1 — Typical interior wall coating system

1 Substrate (wall)
2 packing
3 Primer (1 coat)
4 Top coat (2 coats)
There is no standardized field test method in the market to check the performance of the entire system. Currently, so-called “field testing methods” rely on visual testing, nail scrubbing and touch. These methods are subjective, as the results may vary from person to person, even for the same wall coating system, and the results are not repeatable. Therefore, this document provides standardized test methods for on-site wall paint evaluation. Using these standardized test methods can help distinguish between high quality and low quality interior wall paints.

ISO 23169-2020 “Field test methods for quality assessment of paints and varnished interior wall Coatings”

1 range
This document specifies two field test methods (field cleanliness [stain removal] and field resistance to wet scrubbing) for assessing the quality of interior wall coatings.

These tests are applicable to white coatings and light coatings where the tri stimulus value Y10 is greater than 25 measured on samples consisting of coatings coated on a black substrate.

The cleanability test can differentiate paint quality into 18% pigment volume concentration (PVC) and critical pigment volume concentration (CPVC). Field test methods for wet scrubbing resistance can differentiate coating quality when PVC is almost equal to or above CPVC.

2 Normative references
The following files are referenced in the text in such a way that some or all of the content constitutes the requirements of this document. For dated references, citation-only versions apply. For undated references, the latest version of the reference (including any revisions) applies.

ISO 3696, Analytical laboratory water – specifications and test methods

ISO 4618, Paints and varnishes — Terms and definitions

ISO 6504-3:2019 Paints and varnishes – Determination of coverage-Part 3: Determination of coverage-using paints for masonry, concrete and interiors

ISO 13076, Paints and varnishes – Lighting and procedures for visual evaluation of paints

ISO 23169-2020 “Field test methods for quality assessment of paints and varnished interior wall Coatings”

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

3.1 Paint to water dilution ratio

The ratio of water to paint, expressed as a percentage of mass

3.2 Light Color Coating

Coatings with a tristimulus value of Y10 greater than 25 were measured by spectrophotometer on a sample consisting of coatings coated on a black substrate

Note 1: The tests shall comply with ISO 6504-3.

3.3 Cleanliness

The dry coating film is able to withstand the penetration of the dirt agent and is released from it through the cleaning process without removing more than the specified film thickness

[Source: ISO 11998:2006, 3.1]

3.4 Site wet scrubbing resistance

Ability of the dry film to withstand an average loss of less than the specified oil film thickness within a specified area when exposed to a specified wet scrub cycle (3.5)

Note 1: In ISO 11998, resistance to wet scrubbing is based on laboratory tests of 200 wet scrubbing cycles.

3.5 Scrub cycle

The matte pads move each other once in both directions on the matte length (3.6)

[Source: ISO 11998:2006, 3.2]

3.6 Length of grinding

Length of stroke (3.7) plus length of pad

[Source: ISO 11998:2006, 3.3]

3.7 Stroke Length

The distance the device traverses with a stroke

[Source: ISO 11998:2006, 3.4]

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