This standard outlines a procedure for determining the contrast ratio, or opacity, of light-colored or white coatings when applied at a set spreading rate.”Paints and Varnishes — Determination of Hiding Power — Part 3: Determination of Contrast Ratio (Opacity) of Light-Coloured Paints at a Fixed Spreading Rate” (ISO 6504-3:2006)
Main Point of Interest:
- Opacity Measurement: Assesses how well a coating covers a substrate with black and white contrast.
- Hiding Power: Assesses the paint’s capacity to conceal the underlying surface.
- Performance Rating: Assists in determining appropriateness for applications requiring a single coat of covering.
Method of Testing:
- Sample Preparation: o Evenly apply paint on a test chart that has white and black areas.
- Application Rate: Use common application techniques to maintain a set spreading rate, such as 10 m²/L.
- Assessment: Determine reflectance (Y)
