GMATT 600 Series

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).

GMATT P640 d50: 4.0 - 4.5 µm

Recommended DFT: < 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

Recommended DFT: 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.

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.

Ready to Test GMATT® 600 Series?

Download the full Technical Data Sheet (TDS) and Safety Data Sheet (SDS), or request a complimentary 500g lab sample for your formulation.

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