Premium Clarity in Thin-Film PU Clear Coat
GMATT 255 and GMATT 260 (d50 5–6.5 µm, wax-treated) are engineered for 2K polyurethane clear coats at 15–25 µm DFT — the dominant topcoat system in Chinese furniture for export. At 2.5–4.0 wt% loading, they achieve 60° gloss targets of 15–30 GU with transparency preserved in the clear coat, no whitening on dark-stained oak or walnut, and minimal impact on pot-life in HDI-based 2K systems.
Anti-Settling Performance in NC Lacquers
GMATT 270 (d50 7–7.5 µm) is the primary grade for nitrocellulose lacquers, CAB-acrylic, and NC sealers used throughout Chinese furniture manufacturing. Its wax surface creates a weak gel network in the low-viscosity NC medium, suspending particles through a 6-month shelf life without hard caking. Re-dispersibility by paddle stir is maintained even after prolonged storage — a critical performance point for contract lacquer suppliers.
Floor Primer and Sealer: GMATT 285/290
For thick-film applications such as wood floor primers, stain base coats, and pigmented sealers at 40–60 µm DFT, GMATT 285 and GMATT 290 (d50 8.5–9.5 µm) deliver efficient gloss reduction at 4.0–6.0 wt% with a lower viscosity penalty than finer grades. Their larger silica body provides a textured surface profile that improves intercoat adhesion between sealer and topcoat layers.
Supply Scale for Chinese Furniture Export Clusters
China's furniture production clusters — Guangdong (Shunde, Dongguan), Zhejiang (Anji), Shandong — demand consistent, high-volume silica supply with documented quality. SEMITECH ships FCL quantities (20 MT) with batch-traceable CoA, REACH compliance documentation, and private-label packaging supporting coatings manufacturers serving OEM furniture export brands. HMMAT 200 Series is available for OEM bulk rebrand.
When to Use GMATT 200 for Wood Coatings
GMATT 200 Series matches the wood coatings market's demand for premium clarity, anti-settling in low-viscosity lacquers, and wax-assisted surface protection. Sub-grade selection depends on film build, binder type, and target gloss.
| Scenario | Recommended Grade | Target DFT | Loading |
|---|---|---|---|
| 2K PU furniture clear coat, matte | GMATT 255 / 260 | 15–25 µm | 2.5–4.0 wt% |
| NC lacquer topcoat, general furniture | GMATT 270 | 12–25 µm | 3.0–5.0 wt% |
| NC sealer / stain base coat | GMATT 270 | 20–40 µm | 3.5–5.0 wt% |
| Epoxy / PU wood floor primer | GMATT 285 / 290 | 40–60 µm | 4.0–6.0 wt% |
| Ultra-thin decorative topcoat | GMATT 240 / 245 | 8–15 µm | 2.0–3.5 wt% |
Technical FAQ
Grade-specific wood coatings formulation questions for GMATT 200 Series.
+Which GMATT 200 sub-grade is best for premium PU clear coat on furniture?
GMATT 255 and GMATT 260 (d50 5–6.5 µm) are the primary choices for 2K PU clear coats at 15–25 µm DFT. Their fine particle size and wax treatment deliver 60° gloss targets of 15–30 GU with excellent clarity and no haze on light-colored wood substrates. Loading is typically 2.5–4.0 wt%.
+How does GMATT 200 prevent settling in NC (nitrocellulose) lacquers?
The wax surface treatment on GMATT 200 particles creates a low-density, high-surface-energy shell that promotes a weak gel network in low-viscosity NC lacquers. This network provides sufficient yield stress to suspend silica particles during storage (preventing hard settling) while shear-thinning easily on application. GMATT 270 at 3.0–5.0 wt% is the standard choice for NC wood sealer and topcoat.
+What loading does GMATT 285/290 require for epoxy wood floor primers at 40–60 µm DFT?
GMATT 285 and GMATT 290 (d50 8.5–9.5 µm) are formulated at 4.0–6.0 wt% in epoxy floor primers at 40–60 µm DFT to reach 60° gloss targets of 10–25 GU. The larger particle size provides efficient gloss reduction with minimal viscosity increase, critical for spray and roller application of heavy-bodied floor systems.
+Can GMATT 200 be used in both solventborne and waterborne wood coatings?
GMATT 200 Series is optimized for solventborne systems (PU, NC, nitrocellulose, CAB-acrylic). For waterborne wood coatings, the GMATT WB Series is recommended as it features a hydrophilic surface modification that eliminates seeding and viscosity drift in water-diluted systems. Using standard GMATT 200 in waterborne may cause particle agglomeration.
+Is GMATT 200 suitable for Chinese furniture export production requiring VOC compliance?
Yes. GMATT 200 is an inorganic synthetic amorphous silica that contributes zero VOC to the coating formula. It is fully compliant with GB 18581-2020 (China interior wood coatings VOC limit), EU Directive 2004/42/CE, and US EPA OTC Phase II limits, supporting Chinese furniture manufacturers exporting to EU and North American markets.
Recommended Solution
For premium Chinese furniture export lacquers and floor primers, specify GMATT 200 Series — wax-treated silica with proven anti-settling in NC systems and clarity in thin-film PU clear coat.
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