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Why is the paint class of contrast ratio so important?

When choosing which paint to buy, one of the factors to consider should be its contrast ratio or hiding power.

Why? The contrast ratio will help to determine how much paint is required per m². Or to put it another way, it illustrates the ability of an interior paint to hide a contrasting substrate and what amount of paint would be needed in order to avoid such contrasting substrate. For this purpose, the manufacturers specify the respective contrast ratio of the paint in square meters per liter.

The European Standard EN 13300 for paint classification differentiates four classes depending on their contrast ratio:

· Class 1: Paints that have the highest hiding power class. Paints hiding power (contrast ratio) above 99.5%.

· Class 2: Paints that have excellent hiding power. Paints hiding power (contrast ratio) between 98 -99.5%, when applied in a single layer.

· Class 3: Paints that have good hiding power. Paints hiding power (contrast ratio) between 95-98% per layer.

· Class 4: Paints that have the lowest hiding power class.

Paints hiding power (contrast ratio) up to 95% per layer.

The hiding power is the measure of a paint’s ability to cover a surface. All other things being equal, in practice, this means that paints of the highest hiding power class can be applied even in just a single layer, while paints of a low hiding power class will need to be applied in two or three layers in order to achieve the desired surface.

We can summarize that by purchasing a paint of high hiding power class, will save you labor force and time, as you will need fewer layers to cover the painted surface.

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