Performance characteristics of pigments

Mar 28, 2021

Pigments usually have the following properties:

Color: Color pigment is a kind of pigment that can selectively absorb and scatter visible light, and can present yellow, red, blue, green and other colors under natural light conditions.

Tinting strength: The ability of a colored pigment to absorb incident light. It can be expressed as a relative percentage of the tinting power of a standard pigment sample.

Hiding power: the ability to cover the color of the substrate surface in the film-forming substance. It is usually expressed by the number of grams of pigment contained in a paint covering an area of 1 square meter.

Lightfastness: The ability of a pigment to maintain its original color under a certain amount of light. Generally speaking, an eight-level system is used, and eight-level is the best.

Weather resistance: the ability of a pigment to maintain its original performance under certain natural or artificial weather conditions. Generally speaking, a five-level system is used, and five-level is the best.

Volatile matter: Mainly refers to moisture, generally stipulated not to exceed 1%.

Oil absorption: refers to the number of grams of refined linseed oil required for 100 grams of pigment to form uniform agglomerates. The oil absorption is better. The oil absorption is related to the specific surface area and structure of the pigment particles.

Water-soluble matter: The water-soluble substance contained in the pigment, expressed as a percentage of the pigment's mass. The water-soluble content of paint used in paint is often controlled below 1%.

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