High solids | Filling and bridging properties. Low shrinkage |
Viscosity | The material should not be overly thick as it will be difficult to apply by conventional methods. Conversely excessively thin material will not build the required thickness, or fill efficiently. |
Binder solids | For the best physical properties, the binder solids-by-volume should almost equal the pigment solids-by-volume. This will give the filler more cohesive or inner film strength. |
Alkali | The filler should be alkali-resistant as the 'CMU's and the mortar that holds them together are quite alkaline. High humidity or water seepage can break down non alkali-resistant fillers. |
Compatibility | The filler should be compatible with the finish coating. It should supply a good base for adhesion. |
Water |
The filler should have enough binder (polymer) to remain cohesive, even
Resistance under moderate water-saturated conditions. Without this, finish
coatings with low moisture vapor permeability can show blistering
and 'shearing off,' or large-scale peeling. |