Name: Silica Matting Agent OK-412
Brand: Coatingsink
SKU: matting-agent-silica-ok412
Availability: InStock

Question 1

What gloss levels can OK-412 silica achieve in a waterborne wood coating?

Accepted Answer

At 1–3% loading on total formulation weight, OK-412 typically reduces 60° gloss to 5–20 GU in a clear waterborne polyurethane. Exact reduction depends on binder system, film thickness, and application method. Pre-dispersion at high shear before let-down gives the most reproducible gloss.

Question 2

How should OK-412 be incorporated to prevent hard settling?

Accepted Answer

Add OK-412 as a slurry pre-dispersed in a small portion of solvent or water under high shear (Cowles, 2,000–3,000 rpm, 10–15 min) before adding to the main batch. In waterborne systems, pair with a polymeric dispersant (0.5–1% on silica weight) to reduce gel strength and allow easy re-dispersion on standing.

Question 3

Is OK-412 compatible with both solventborne and waterborne systems?

Accepted Answer

Yes. OK-412 is surface-untreated precipitated silica and is compatible with solventborne (alkyd, NC lacquer, 2K PU) and waterborne (acrylic, PU dispersion, UV-cure) systems. For UV-cure or high-polarity solvent systems, wax-treated grades may offer lower transparency impact; compare both in your specific matrix before committing.

Oil Absorption	195–215 g/100 g
BET Surface Area	280–320 m²/g
Moisture Content	≤6%
pH (5% dispersion)	6.5–8.0
Average Particle Size (d50)	6–8 μm

Silica Matting Agent OK-412

Specifications

FAQ

Interested in Silica Matting Agent OK-412?