Improving tint strength with TiO2
Tinting strength is a measure of the ability of a colorant to alter the color of a paint film.
Hiding power and tinting strength are two optical properties used to describe the light-scattering efficiency of a white pigment. While hiding power is a measure of the ability of TiO2 to opacify a white paint film, tinting strength describes its ability to add whiteness and brightness to the color of a tinted paint.
To achieve the full tinting strength power potential of TiO2 in coatings, the TiO2 must:
- be well dispersed initially and
- avoid particle re-agglomeration throughout coating production, storage, application and drying.
Low tinting strength in a coating can be caused by:
- Inefficient Dispersion or Deagglomeration
- Pigment Flocculation
DuPont TiO2 products are designed to facilitate easy dispersion and to be compatible with other coating components that might induce flocculation or re-agglomeration of the TiO2 particles.
For more information on how to achieve and maintain TiO2 dispersion in coatings, please refer to, Enhancing TiO2 dispersion performance.
The tinting strength test describes TiO2 light-scattering contribution relative to the light absorbing ability of a colored pigment when a white paint is tinted to about 50% reflectance with the colored pigment. To be sure that flocculation does not give misleading tinting strength results, the tinting strength measurement should be accompanied by some measure of flocculation such as a rub-up test on the partially dried tinted paint.