The quality of PU color paste can be evaluated from the following aspects:
Color stability: A high-quality PU color paste should have good color stability, that is, it will not fade or change color easily. You can apply the color paste on an appropriate substrate and expose it to sunlight or other light sources for a period of time to see if the color remains stable.
Color paste uniformity: has uniform color distribution, no color difference or granular material. This can be evaluated by observing the appearance of the color paste in the container or the uniformity after application on the specimen.
Covering power: The covering power of PU color paste is also an important indicator, that is, it can cover the original color and present the desired color after being applied to the substrate. Coverage testing can be performed to evaluate.
Light resistance: It has good light resistance, that is, it is not easy to fade or turn yellow when exposed to sunlight or ultraviolet rays. Photoaging testing can be performed to evaluate.
Viscosity and drying time: The viscosity and drying time of PU color paste are also important factors affecting the quality. Whether the viscosity and drying time meet the requirements can be evaluated through actual application operations.
Chemical composition: Finally, you can check the chemical composition and manufacturer information of PU color paste to understand its production process and raw material sources, and whether it complies with relevant standards and regulations.
