Name: UV-Stable Silica Matting Agent for Clear UV Coatings MUS-30
Brand: Coatingsink
SKU: matting-agent-uv-silica-mus
Availability: InStock

Question 1

Why use a hydrophobically treated silica matting agent in UV coatings rather than an untreated grade?

Accepted Answer

The hydrophobic surface treatment prevents moisture adsorption and reduces hydrogen bonding with polar UV monomers and oligomers. This keeps viscosity stable during storage and application, avoids surface defects such as cloudiness or orange peel, and minimises yellowing or haze in the cured clear film — issues that are common with untreated precipitated silicas under high-intensity UV exposure.

Question 2

How does particle size D50 of 7 µm affect gloss reduction and transparency in a clear UV coating?

Accepted Answer

A D50 of 7 µm sits in the sweet spot for matte UV coatings: particles protrude above the cured film surface to scatter light and reduce gloss without extending far enough to cause visible graininess or significant haze in thicker clear layers. Coarser grades (D50 > 12 µm) produce lower gloss at equivalent loading but compromise transparency in glossy base coats.

Question 3

What is the maximum loading level of MUS-30 before visible haze appears in a 30 µm UV clear coat?

Accepted Answer

In a typical aliphatic urethane acrylate or polyester acrylate clear coat at 30 µm dry film thickness, haze remains acceptable (ΔH < 2 units) at loadings up to approximately 3% by weight. Beyond 4%, light scattering increases noticeably, particularly in high-build coats. For ultra-low-gloss targets (< 5 GU at 60°), combine MUS-30 at 3–4% with a fine wax additive rather than increasing silica loading further.

Oil Absorption	240 g/100 g
BET Surface Area	300 m²/g
Particle Size D50	7 µm
Particle Size D98	≤20 µm
Recommended Dosage	1–4%

UV-Stable Silica Matting Agent for Clear UV Coatings MUS-30

Specifications

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