Key Features
- Zero Loss of Adhesion: Proprietary non-wax organic treatment guarantees flawless inter-coat adhesion, crucial for multi-layer UV systems.
- Superior Anti-Settling: Excellent suspension properties prevent hard caking in low-viscosity, 100% solid monomer/oligomer blends.
- Low Viscosity Impact: Controlled oil absorption (130-200) allows for high matting agent loading without dramatic viscosity spikes.
- High Transparency: Optimized refractive index prevents hazing and maintains the natural warmth of wood substrates.
Applications
- 100% Solid UV Wood Coatings (Roller & Spray)
- UV Curable Inks & Overprint Varnishes (OPV)
- UV Plastic Coatings (3C Electronics)
- Waterborne UV (WB-UV) Systems
GMATT UV Series: Grade Selector
UV coatings require precise particle size matching to balance film smoothness and matting efficiency. Select the optimal grade based on your target Dry Film Thickness (DFT) and application method.
| Grade | Spec | Recommended DFT | Notes |
|---|---|---|---|
| GMATT U700 | d50 7.0 – 7.5 µm | 15 – 25 µm (Thin/Medium Film) | Ideal for thin-film UV spray coatings and OPV. Delivers exceptional transparency and a smooth, refined touch. Minimal viscosity impact. |
| GMATT U750 | d50 7.5 – 8.0 µm | 25 – 30 µm (Medium Film) | The versatile standard for UV wood coatings. Perfect balance between high matting efficiency and anti-settling performance. |
| GMATT U800 | d50 8.0 – 8.5 µm | > 30 µm (Thick Film) | Designed for heavy-duty UV roller coatings and thick primers. Provides strong matting power, excellent scratch resistance, and robust suspension. |
💡 Formulator Tip: When formulating 100% solid UV systems, viscosity control is paramount. The GMATT UV Series features controlled oil absorption (130-200 g/100g), allowing you to achieve a dead-matte finish without turning your liquid coating into an unworkable paste.
General Properties
Typical properties for the GMATT UV Series. Engineered with a proprietary special treatment to thrive in low-viscosity, radiation-curable environments.
| Parameter | Typical Value | Unit |
|---|---|---|
| Pore Volume | 1.0 – 1.8 | ml/g |
| Oil Absorption | 130 – 200 | g/100g |
| Loss on Drying (2h @ 105°C) | ≤ 5.0 | % |
| Loss on Ignition (2h @ 1000°C) | ≤ 12.0 | % |
| pH Value (5% aqueous) | 6.0 – 8.0 | – |
| SiO₂ Content (dry basis) | ≥ 99.0 | % |
| Surface Treatment | Special Treatment | – |
- 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 UV Series delivers the same non-wax UV-curable 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.
+Why shouldn’t I use standard wax-treated matting agents in UV coatings?
In 100% solid UV coatings, the rapid curing process can force standard polyethylene (PE) waxes to migrate to the surface. This creates a “weak boundary layer” that destroys inter-coat adhesion (recoatability). Our GMATT UV Series uses a proprietary organic treatment that prevents hard settling without migrating, ensuring perfect adhesion between layers.
+How to prevent silica from settling in low-viscosity UV monomers?
UV formulations often have very low viscosity, making hard caking a major issue during storage. The GMATT UV Series is specially treated to provide steric hindrance, ensuring that any settled particles form a soft, easily stirrable sediment. For extreme cases, we recommend incorporating a small amount of our Hydrophobic Fumed Silica to build a weak thixotropic network.
+How does the UV Series affect the viscosity of 100% solid coatings?
Unlike high-porosity silica that drastically thickens a system, the GMATT UV Series is engineered with a controlled oil absorption (130-200 g/100g). This allows formulators to add the necessary amount of matting agent to achieve a dead-matte finish without causing unacceptable viscosity spikes in roller or spray applications.
+How much matting agent is required for a dead-matte UV finish?
In typical UV-curable wood or plastic coatings, a dosage of 5% to 10% (based on total formulation weight) is usually required to reach a dead-matte finish. Because UV systems do not shrink upon curing (no solvent evaporation), the silica particles remain fully embedded, meaning slightly higher dosages are needed compared to solvent-based systems.