EN ISO 6504-1:2006

Foreword
0 Introduction
1 Scope and field of application
2 References
3 Principle
4 Kubelka-Munk equations
5 Apparatus and materials
6 Sampling
7 Procedure
8 Expression of results
9 Precision
10 Test report
Annex A Graphs for determination of St from R[B]
        and R[infinite]
Annex B Table of values of reflectivity R[infinite] and
        factor [alpha]
Annex C Examples of the calculation of hiding power from
        measurements of R[B] and R[infinite]

Specifies a method to be used for determining the spreading rate necessary to give a contrast ratio of 98 % of coating materials. The method is restricted to paint films having the tri-stimulus value of Y 70; it is not applicable to fluorescent or metallic paint materials. The principle of the method is based on the Kubelka and Munk equations relating the scattering and absorption coefficients of pigmented films to their colour and opacity. For the determination of hiding power, both the reflectance of a film of thickness, t, on a black background and the reflectivity are required.