Use of Dolomite Powder (500 Mesh) in Primer
Dolomite powder ground to 500 mesh is an ultra-fine grade that offers several advantages in primer formulations, especially in smooth-finish and high-quality coatings.
Key Roles in Primer:
Smoothness & Film Quality
Very fine particle size fills micro-pores in the substrate, resulting in a uniform, smooth primer coat.
Reduces surface roughness, improving the appearance of the topcoat.
Opacity & Coverage
Acts as a TiO₂ extender by spacing pigment particles and improving light scattering, helping achieve good hiding at a lower cost.
Better Adhesion & Surface Sealing
Enhances adhesion of the primer to cement, plaster, or wood by improving film density.
Fine particles penetrate pores, sealing the surface and reducing topcoat absorption.
Alkali Resistance
Being calcium magnesium carbonate, dolomite offers good alkaline resistance, protecting primers used on fresh plaster or cement surfaces.
Improved Sandability
In wood and wall primers, the fine texture allows for easy sanding to a powdery finish without clogging sandpaper.
Cost Optimization
Replaces part of expensive white pigments and fillers without compromising quality, especially in white or tinted primers.
Key Benefits in Distemper:
Smooth Finish
Finer than 300 mesh, giving a more refined and even surface while still being economical.
Suitable for medium- to high-grade distempers.
Opacity & Coverage
Works as a TiO₂ extender, improving hiding power while keeping pigment costs lower.
Good light-scattering ability for bright shades.
Colour Uniformity
Fine particle size ensures better dispersion of pigments, reducing patchiness in coloured distempers.
Film Strength & Adhesion
Improves binding between the distemper matrix and the wall, reducing powdering or flaking.
Cost Optimisation
Offers a cost–quality balance—cheaper than high-whiteness calcite yet provides sufficient brightness for most shades.
Best Use Strategy:
For coloured distempers → Can be used at high percentages as whiteness is less critical.
For white distemper → Blend with high-whiteness calcite or increase TiO₂ to maintain brightness.
Works well in both OBD and dry distemper formulations.