Key Features
- Exceptional Matting Efficiency: Extremely high oil absorption (320-360 g/100g) provides powerful gloss reduction at minimal dosage levels.
- Strong Anti-Settling: Organic wax surface treatment prevents hard caking and ensures a soft, easily re-dispersible sediment during prolonged storage.
- Smooth Surface Finish: Tightly controlled particle size distribution guarantees a highly refined, silky touch without surface roughness.
- Rheology Support: The high porosity structure naturally contributes to mild rheological control, helping to prevent sagging in thicker films.
Applications
- General Industrial Finishes
- Coil Coatings & Baking Enamels
- Solvent-based Wood Coatings (Clear & Pigmented)
- Leather Finishes
GMATT 600 Series: Grade Selector
Selecting the right particle size is critical for maintaining film clarity and smoothness. Match the specific grade to your target Dry Film Thickness (DFT).
| Grade | Spec | Recommended DFT | Notes |
|---|---|---|---|
| GMATT P640 | d50 4.0 – 4.5 µm | < 15 µm (Thin Film) | Ultra-fine particles designed for thin-film clear coats, leather finishes, and thin plastics coatings where high transparency and a smooth feel are mandatory. |
| GMATT P650 | d50 6.5 – 7.0 µm | 15 – 25 µm (Medium Film) | The versatile industry standard. Excellent for general industrial finishes, coil coatings, and wood topcoats. Delivers maximum overall matting efficiency. |
💡 Formulator Tip: Due to the exceptionally high oil absorption (320-360) of the GMATT 600 Series, it provides not only matting but also a slight rheology-building effect. This makes it an excellent choice for low-viscosity systems that require extra suspension support.
General Properties
Typical properties for the GMATT 600 Series. Backed by advanced precipitation technology ensuring high purity and robust performance.
| Parameter | Typical Value | Unit |
|---|---|---|
| Oil Absorption | 320 – 360 | g/100g |
| Loss on Drying (2h @ 105°C) | ≤ 5.0 | % |
| Loss on Ignition (2h @ 1000°C) | ≤ 10.0 | % |
| pH Value (5% aqueous) | 6.0 – 8.0 | – |
| SiO₂ Content (dry basis) | ≥ 98.0 | % |
| Surface Treatment | Organic Wax | – |
- Typical values only. Not for sales specifications. Refer to COA for batch data.
OEM Bulk Supply
Need FCL quantities (25 MT+) with private-label packaging? HMMAT 600 Series delivers the same high oil absorption precipitated silica in full-container volumes, audit-ready with ISO 9001 + REACH documentation.
Alternative Grades
Frequently Asked Questions
Formulation advice and technical solutions from our R&D engineers.
+How does the high oil absorption (320-360) benefit my formulation?
High oil absorption indicates a highly porous internal structure, meaning you need significantly less matting agent by weight to achieve your target gloss level. Additionally, this porosity absorbs resin and solvent, providing a mild thickening effect that helps prevent pigment settling and sagging in thicker films.
+Can I use the P640/P650 grades in clear wood coatings?
Yes. The organic wax treatment in the GMATT 600 series is carefully optimized to maintain good transparency while providing essential anti-settling properties. For thin clear coats where hazing is a primary concern, we strongly recommend using the finer GMATT P640 to ensure a perfectly clear finish.
+What is the main difference between P640 and P650?
The primary difference is the average particle size (d50). Use GMATT P640 (4.0-4.5 µm) for very thin films (<15 µm) to ensure a perfectly smooth surface without micro-roughness. Use GMATT P650 (6.5-7.0 µm) for medium-to-thick films where you need maximum matting efficiency at the lowest possible cost.
+How should I disperse the GMATT 600 Series?
These precipitated grades are designed for easy incorporation. Add them during the let-down stage and disperse using a standard high-speed dissolver (e.g., Cowles blade) at 1500-2000 RPM for 15-20 minutes. Grinding via bead mills should be strictly avoided as it will destroy the porous structure and eliminate the matting efficiency.