Pair with SEMITI TiO2 for powder coatings
Powder Coating FAQ
Solutions for flowability, storage, and electrostatic spray challenges.
+Why is fumed silica necessary for electrostatic powder spraying?
Without a fluidization aid silica, powder particles tend to clump due to mechanical friction and static. Our fumed silica coats the resin, improving chargeability and ensuring the powder flows smoothly through the hoses to the gun without surging.
+How much fumed silica should be added to a powder formulation?
Typically, addition levels range from 0.2% to 0.5% by weight. It is best added during the dry-blending stage (post-extrusion) to ensure the silica aggregates are distributed on the surface of the ground powder particles.
+Can hydrophilic silica prevent powder “sintering” in hot climates?
Yes. As a high-performance anti-caking agent for powder coatings, SEMISIL creates a physical spacer between resin particles. This prevents them from fusing together (sintering) when exposed to high ambient temperatures during shipping or storage.
+Does 200 BET fumed silica affect the final film’s orange peel or gloss?
When used at recommended levels, hydrophilic fumed silica 200 BET has zero negative impact on film leveling or gloss. In fact, by improving the uniformity of the powder application, it often helps achieve a smoother, more consistent finish.
+Should I use hydrophilic or hydrophobic silica for powder coatings?
For most standard epoxy, polyester, and hybrid powders, hydrophilic fumed silica is the industry standard for free-flow. However, for powders used in extremely high-humidity environments, our hydrophobic grades can provide additional moisture protection.
Recommended Solution
For universal free-flow and anti-caking performance, we recommend SEMISIL 200 (Hydrophilic).
View SEMISIL Treated Details View SEMISIL Hydrophilic Details
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