NC and PU Furniture Lacquers: Achieving 5–30 GU at 60°
Chinese furniture OEM factories — the world's largest volume producers of export-grade wooden furniture — operate NC and PU topcoat lines where gloss repeatability is a contractual specification. Target gloss for flat finishes is 5–15 GU at 60°; satin finishes specify 20–35 GU. GMATT 200 Series, with a d50 of 3.5–5 µm and wax surface treatment, delivers this range at 4–6% loading by weight in NC lacquers and 3–5% in PU topcoats. The wax treatment is critical in fast-flash NC systems: untreated silica absorbs solvent during the 3–5 minute ambient flash-off, destabilizing the matting layer and shifting final gloss 3–6 GU above target.
Hardwood floor lacquers apply stricter performance requirements — DIN 68861 scratch resistance, Taber abrasion (CS-17 wheel, 500 cycles, <50 mg loss), and pencil hardness ≥ 2H alongside gloss control. Loading above 5% by weight typically degrades abrasion resistance by weakening the coating matrix. Optimize at 3–4% loading using the GMATT 300 Series for floor-grade systems.
UV-Cured Furniture Finishes: Matting in Sub-5-Second Cure Windows
UV-cured furniture topcoats have grown to >35% of total furniture lacquer volume in Chinese export factories due to throughput advantages (60–100 m/min line speeds). The matting challenge is unique: silica must distribute to the coating surface during the liquid flow phase (typically 0.5–2 seconds) before UV irradiance (80–160 W/cm) locks the film. GMATT UV Series is engineered with particle size and surface treatment tuned to this narrow window. At 30–40 µm DFT and 3–5% loading, GMATT UV targets 8–20 GU at 60°.
UV-cured coil and flat-panel furniture use conveyor speeds of 40–80 m/min. In these systems, particle settling during pot life is a secondary concern — matting agent density and oil absorption are the primary dispersion variables. GMATT UV maintains an oil absorption of 180–250 mL/100g, balancing viscosity contribution against flow-out performance.
Waterborne Furniture Coatings: GMATT WB for Low-VOC OEM Lines
Stricter VOC regulations (China GB 18581-2020: <550 g/L for furniture coatings, <100 g/L for waterborne) are accelerating the shift to waterborne PU and acrylic furniture topcoats in export-oriented factories serving EU and US retail chains. GMATT WB Series addresses the compatibility challenge: hydrophilic surface treatment ensures stable dispersion in water-continuous systems without pH-dependent aggregation. Loading range is 4–7% by weight for gloss targets of 10–30 GU at 60°.
Waterborne systems with pH 7.5–9.0 require matting agents with minimal ionic leaching. Specify grades with aqueous suspension conductivity < 200 µS/cm to avoid electrostatic destabilization of the latex binder at high matting agent concentrations.
Dispersion Protocol for High-Volume Furniture Production
Furniture factories running three-shift operations need dispersion protocols that are robust under production variation. The recommended procedure for GMATT 200/300/WB: add matting agent to the resin letdown at 1,200–1,500 rpm using a Cowles blade, disperse for 8–12 minutes, and confirm D50 via fineness-of-grind gauge (target: no particles above 15 µm). Pre-dispersed GMATT slurries (50% solids) are available for automated pump dosing, eliminating human weighing error in high-throughput lines.
Never pre-grind matting agents with pigments. Co-grinding reduces matting efficiency by 20–30% through partial embedding of the silica structure into pigment agglomerates. Add matting agents as a separate letdown addition after the grind stage.
Furniture Industry Matting Agent Specification Guide
Select GMATT grade based on lacquer chemistry, DFT, and target gloss range.
| Parameter | NC Lacquer (Flat) | PU Topcoat (Satin) | UV Topcoat | Waterborne PU |
|---|---|---|---|---|
| Target gloss (60°) | 5–15 GU | 20–35 GU | 8–20 GU | 10–30 GU |
| Recommended d50 | 4–5 µm | 3.5–5 µm | 3–4 µm | 3–5 µm |
| Loading (% by wt) | 4–6% | 3–5% | 3–5% | 4–7% |
| Surface treatment | Wax-treated | Wax-treated | Wax/silane | Hydrophilic |
| DFT range | 20–40 µm | 30–50 µm | 30–40 µm | 30–60 µm |
| Recommended grade | GMATT 200 Series | GMATT 200 Series | GMATT UV Series | GMATT WB Series |
Frequently Asked Questions
Common questions about furniture industry matting applications.
+What gloss level is standard for furniture lacquers?
Flat/matte furniture finishes target 5–15 GU at 60°, satin finishes 20–35 GU. Chinese OEM export contracts often specify gloss by Gardner scale (G1–G3) which maps roughly to 5–15, 20–35, and 40–60 GU respectively. Measure at 60° for all furniture grades; 85° angle is used for checking near-matte uniformity on dark stained wood.
+Which GMATT grade is recommended for NC furniture lacquers?
GMATT 200 Series is the primary choice for NC (nitrocellulose) and PU furniture lacquers. Its wax surface treatment prevents resin absorption during the short flash-off window of NC systems (typically 3–5 min at ambient), delivering consistent gloss batch to batch. Loading is 4–6% by weight in NC topcoats targeting 5–15 GU.
+How do I control gloss in UV-cured furniture finishes?
UV-cured furniture topcoats present a unique challenge: the matting agent must maintain its surface distribution during the rapid (<5 second) UV cure. GMATT UV Series is optimized for this — its particle size and surface treatment are tuned so the silica migrates to the surface during the liquid flow phase before cure locks the film. Loading is 3–5% at 30–40 µm DFT for 8–20 GU targets.
+Can I use the same matting agent for both topcoat and sealer?
Sealers and topcoats serve different functions, so matching grades are not recommended. Sealers at 60–100 µm DFT benefit from coarser grades (d50 5–7 µm) at 2–3% loading for mild sheen control. Topcoats require finer grades (d50 3–5 µm) at 4–6% for precision gloss control. Using a coarse sealer-grade matting agent in a topcoat causes sandpaper-like texture on the final surface.
+Why does my matte furniture coating show gloss variation between batches?
Batch-to-batch gloss variation is almost always caused by two factors: inconsistent dispersion time and matting agent moisture uptake. Disperse at 1,200–1,500 rpm for exactly 10 minutes and store matting agent in sealed containers at <60% RH. Wax-treated grades (GMATT 200 Series) are far less sensitive to ambient humidity than untreated precipitated silica, which can shift gloss ±3–5 GU in humid Chinese factory environments.
+What is the best matting agent for hardwood floor coatings?
Hardwood floor coatings at 30–50 µm DFT with heavy foot traffic require a matting agent that provides gloss control without compromising abrasion resistance. GMATT 300 Series at 3–4% loading in 2K PU or UV-cured floor systems targets 10–25 GU at 60° while maintaining pencil hardness ≥ 2H. Avoid overloading above 5% — excess free silica weakens the coating matrix and reduces mar resistance.
For Chinese furniture OEM export production, specify GMATT 200 Series at 4–6% in NC/PU topcoats for flat finishes at 5–15 GU, or GMATT UV Series at 3–5% for UV-cured lines; both grades are optimized for the high-throughput, humidity-variable conditions of Chinese factory environments.