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Formulators of leather finishers face a specific matting problem: the silica must cut gloss, but it cannot leave white spots, thicken the coating, or dull the natural color of the leather. Precipitated matting silica FINE SIL 7300P is designed exactly for this balance.
Q1: Why do some matting agents cause white spots in leather finishing?
White spots appear when matting powder disperses poorly and forms agglomerates in the finish film. FINE SIL 7300P applies well in different systems and disperses easily, so the film stays uniform. Its low oil absorption also means little effect on the viscosity of the coating — the finish stays workable without extra thinner.
Q2: How does 7300P keep the leather color vivid?
By increasing the purity, the haze of the coating is improved and the refractive efficiency rises, so the color of the leather itself is better displayed and looks more vivid — the matte effect comes from controlled micro-roughness, not from a milky film.
Q3: Which grade should I choose — 7300P Ⅰ or 7300P Ⅱ?
The two grades share particle size 3.0–4.0 μm, SiO2 (dried) ≥98%, pH 6–8, moisture ≤5%, loss on ignition ≤6%, pore volume 1.5 ml/g, and special surface treatment. The difference is oil absorption:
|
Item |
FINE SIL 7300P Ⅰ |
FINE SIL 7300P Ⅱ |
|
Particle Size (μm) |
3.0–4.0 |
3.0–4.0 |
|
SiO2 (dried) % |
≥98 |
≥98 |
|
Oil Absorption (cm³/g) |
2.5–3.0 |
2.0–2.5 |
|
pH Value (5% Suspension) |
6–8 |
6–8 |
|
Moisture % |
≤5 |
≤5 |
|
Loss on Ignition % |
≤6 |
≤6 |
|
Pore Volume (ml/g) |
1.5 |
1.5 |
|
Surface Treatment |
special |
special |
Selection logic: choose 7300P Ⅰ when the matte depth is the priority (higher oil absorption supports a stronger extinction efficiency); choose 7300P Ⅱ when the formulation is sensitive to viscosity build-up and you want the lowest possible impact on flow.
Application areas: high-grade leather finishing agents (PVC, PU); general industrial coatings; automotive coatings.
FAQ
Related Product: Matting agent for Leather finisher — IOTA FINE SIL 7300P
