To judge the quality of PU color paste, you can consider the following aspects:
Color stability: A high-quality PU color paste should have good color stability, that is, the color will not change or fade under different lighting conditions. You can expose the sample to sunlight and observe whether the color remains stable over time.
Color uniformity: Observe the color uniformity of the PU color paste in an unstirred state. A high-quality color paste should have no stains and precipitation, and the color should be evenly distributed after stirring.
Viscosity and fluidity: The viscosity and fluidity of PU color paste are important for the coloring effect and operating performance. The quality of the color paste can be evaluated by observing and testing its flow and spreadability.
Light resistance and weather resistance: PU color paste needs to have good light resistance and weather resistance, and can maintain the color without fading or deterioration for a long time in outdoor environment.
Environmental protection: High-quality PU color paste should comply with environmental protection standards, contain no harmful substances, and should not cause harm to the human body and the environment during use and processing.
Compatibility with the base material: PU color paste should have good compatibility with the base material and be able to fully integrate with various base materials to ensure uniform coloring effect and firm adhesion.
Stability: Whether PU color paste will undergo precipitation, delamination or other changes after long-term storage is also an important indicator of quality.
