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

Question 1

What makes wax-treated precipitated silica preferable to untreated grades for matte coatings?

Accepted Answer

The wax surface treatment reduces agglomeration tendency and improves dispersibility in both solventborne and waterborne systems. It also imparts a lubricating effect at the film surface, which translates to improved mar and scratch resistance compared to untreated silica at equivalent gloss levels.

Question 2

How does the high BET surface area (≈300 m²/g) of OK-412 type silica affect formulation?

Accepted Answer

A higher BET surface area means more micro-porosity per gram, which improves scattering efficiency and allows lower loadings to achieve target gloss — typically 1–3% in clearcoats. However, it also increases oil absorption, so formulators should monitor viscosity build and adjust rheology modifier accordingly.

Question 3

Is this matting agent suitable for UV-curable wood coatings?

Accepted Answer

Yes. The wax-treated precipitated silica disperses well in acrylate oligomer/monomer blends and does not significantly quench free-radical photoinitiators. Typical loading is 2–4% for flat to satin (GU 5–30 at 60°). Pre-disperse in a low-viscosity monomer fraction before let-down to avoid dry agglomerates.

pH (5% slurry)	6.0–8.0
BET Surface Area	~300 m²/g
Moisture Content	≤6%
D50 Particle Size	4–5 µm
Recommended Dosage	1–5%

Precipitated Silica Matting Agent OK-412 Type

Specifications

FAQ

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