1. the colouring strength of the colour paste (colouring power)

For the comparison of water-based colour pastes, the colouring strength is an important indicator, which reflects the colour concentration of the colour paste, the colour spreading performance and the flocculation of the pigment dispersion. The data is measured by the number of parts of pigment paste required to achieve 1/25 of the International Standard Depth (ISD) of the colour, the smaller the value, the higher the tinting power. The numerical value represents the number of grams of pigment paste needed to be added to white base paint: in latex paint - white base paint with 25% titanium dioxide content (1/25ST)

2. Compatibility of the pigment paste (colour spreading performance - Finger Research Method)

3、Dispersing performance of colour paste (degree of flocculation)

4. one of the structural properties of the colour paste (light resistance, weather resistance)

The test of light resistance and weather resistance of the colour paste is through outdoor exposure, but the actual outdoor exposure time is too long, and most of the general testing of the performance of the colour paste is through the simulation of instrumentation.

5. the pigment content of the colour paste

The pigment content is only for reference, and cannot be used as an index for assessing the performance of the colour paste. The colouring power of colour paste is not simply proportional to the pigment content. The same pigment content, the fineness of the different colouring power also has a great difference. In order to ensure the stability of the colouring power of the colour paste, the pigment content of the colour paste is a variable value within a certain range, and the value provided on the information of the colour paste is a typical reference value.

6, the fineness of the colour paste

7, the compatibility of colour paste and paint

8, the structure of the colour paste performance of the second (chemical media resistance)

water-based colour paste chemical media resistance is mainly acid resistance, alkali resistance, that is, chemical migration resistance. The performance basically depends on the pigment itself, in the outdoor colour paste must consider this factor. Generally water-based paints are also required to be resistant to acids and alkalis, not to organic solvents and other chemicals.

(density, viscosity, PH value, pigment content, solids and fineness and gloss)

10, the quality stability of the colour paste

Selection of colour paste should focus on the above factors, other conditions of the various brands of colour paste can basically be achieved and the difference is not significant. Of course, when choosing the colour paste should also be from the economic, environmental protection and other perspectives, such as: the interior wall colour paste can be selected to weather some of the colour paste, and at the same time, the interior wall try not to choose the chromium yellow and other heavy metal-containing colour pastes, but should be selected azo, amine and so on.