A Preface

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ISO 6504-1-2019 “Determination of the hiding power of paints and varnishes – Part 1: Kubeika-Munk method for white and light paints”

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This document is prepared by Technical Committee ISO/TC 35, Paints and varnishes, Sub-Committee SC 9, General test methods for paints and varnishes.

The second edition eliminates and replaces the first edition (ISO 6504-1:183), which has been technically revised. The main changes from the previous edition are as follows:

a) Updated normative references in Chapter 2;

b) Chapter 3 with terms and definitions added;

c) the restrictions of article 7 are added;

d) Throughout the text, the term “contrast” has been changed to “hiding power”;

e) It has been clarified that the reflectivity Rg needs to be measured and the values in the graphs and Table B.1 in Appendix A are only examples of Rg = 0.80.

A list of all parts of the ISO 6504 series can be found on the ISO website.

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ISO 6504-1-2019 “Determination of the hiding power of paints and varnishes – Part 1: Kubeika-Munk method for white and light paints”

Introduction
ISO 6504-3 [1] specifies a method for determining the hiding power of paint at a fixed spread rate by applying the film to black and white charts and myL, respectively. This depends on the observation that there is a linear relationship between the hiding power and the inverse of the film thickness, at least over a limited range of film thickness.

The covering power of a paint is usually defined as the spread rate required to achieve 98% covering power. Determining this through the method specified in ISO 6504-3 [1] would be very time-consuming and would require a lot of extrapolation, which would generally exceed the linear limit of the relationship between coverability and spread rate. As a result, this method for determining hiding power, which involves the Kubelka-Munk (KM) equation relating scattering and absorption coefficients to optical properties, has also been standardized.

1 Scope of application
This document provides a method for determining the coverability of white or light paint (the spread rate required to achieve 98% coverability). Suitable for three color value Y≥70, covering power > 80% paint film. It is not suitable for fluorescent or metallic coatings.

2 Normative reference documents
When the following documents are referred to in the text, part or all of their contents constitute the requirements of this document. For dated references, only the cited version applies. For undated citations, the new version of the citation document (including any revisions) applies.

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

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 2811-1, paints and varnishes — Determination of density — Part 1: Specific gravity bottle method

ISO 3251, Paints, varnishments and plastics – Determination of the content of non-volatile substances

ISO 4618, Paints and varnishes – Terms and definitions

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

ISO 6504-1-2019 “Determination of the hiding power of paints and varnishes – Part 1: Kubeika-Munk method for white and light paints”

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

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

– IEC Electropedia: available at electropedia.org/

– ISO online browsing platform: iso.org/obp

3.1 Light paint

Coatings with tristimulus values Y and Y 10 greater than 25 were measured with a spectrophotometer on a black and white substrate

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