Q: Is GMATT WB suitable for waterborne wood coatings where clarity is critical?

Yes. GMATT WB is available in a fine-particle sub-grade suitable for waterborne wood clear coats at 15–25 µm DFT, where transparency to the wood grain must be maintained. The hydrophilic surface ensures complete dispersion without agglomeration that would cause cloudiness in the clear coat. At 2.5–4.0 wt% loading, GMATT WB achieves 60° gloss of 15–30 GU in waterborne PU wood lacquer without haze in the cured film.

Q: Can GMATT WB be used in waterborne architectural coatings compliant with EU Ecolabel or GB/T 9756 standards?

Yes. GMATT WB is an inorganic synthetic amorphous silica classified as non-hazardous under CLP/GHS. It contributes zero VOC, zero SVOC, and zero restricted substances to the coating formulation. It is compatible with coatings formulated to comply with EU Ecolabel for indoor paints (VOC < 30 g/L for tinted, < 1 g/L for white), China GB/T 9756-2018 (interior wall emulsion paint), and US EPA Architectural Coatings Rule. SEMITECH provides a Declaration of Conformity on request.

Question 1

What is the seeding defect in waterborne coatings and how does GMATT WB eliminate it?

Accepted Answer

Seeding is the formation of visible silica agglomerates (typically 0.5–2 mm diameter) in waterborne coatings during storage or dilution. It occurs when the silica surface has hydrophobic character (from wax or organofunctional treatment) that causes inter-particle bridging in the aqueous phase. GMATT WB carries a hydrophilic surface modification that makes the silica wettable by water, forming a stable solvation shell around each particle. This prevents inter-particle bridging and maintains individual particle dispersion through the full storage life and through point-of-use dilution.

Question 2

How does GMATT WB maintain stable viscosity through water dilution in architectural tinting systems?

Accepted Answer

In architectural tinting systems, the base paint is diluted with water at point of sale or on-site (typically 5–15% water addition). Silica grades with hydrophobic surfaces can flocculate during dilution, causing a viscosity spike that makes the diluted paint difficult to apply. GMATT WB's hydrophilic surface remains fully dispersed through the dilution range — viscosity decreases predictably with water addition rather than exhibiting the non-linear spike. This ensures consistent application properties for architectural coatings sold through tinting base programmes.

Question 3

What loading is recommended for GMATT WB in zero-VOC waterborne 2K PU topcoat?

Accepted Answer

In waterborne 2K PU topcoat (isocyanate-crosslinked, VOC < 50 g/L) at 20–35 µm DFT, GMATT WB at 3.0–5.0 wt% achieves 60° gloss targets of 10–30 GU with good chemical resistance and hardness development. The hydrophilic surface of GMATT WB is compatible with the water-dispersed polyisocyanate hardener used in waterborne 2K PU systems — preventing the silica-to-isocyanate reaction that standard gel silica surface silanols can trigger, consuming isocyanate and disrupting the stoichiometry.

Question 4

Is GMATT WB suitable for waterborne wood coatings where clarity is critical?

Accepted Answer

Yes. GMATT WB is available in a fine-particle sub-grade suitable for waterborne wood clear coats at 15–25 µm DFT, where transparency to the wood grain must be maintained. The hydrophilic surface ensures complete dispersion without agglomeration that would cause cloudiness in the clear coat. At 2.5–4.0 wt% loading, GMATT WB achieves 60° gloss of 15–30 GU in waterborne PU wood lacquer without haze in the cured film.

Question 5

Can GMATT WB be used in waterborne architectural coatings compliant with EU Ecolabel or GB/T 9756 standards?

Accepted Answer

Yes. GMATT WB is an inorganic synthetic amorphous silica classified as non-hazardous under CLP/GHS. It contributes zero VOC, zero SVOC, and zero restricted substances to the coating formulation. It is compatible with coatings formulated to comply with EU Ecolabel for indoor paints (VOC < 30 g/L for tinted, < 1 g/L for white), China GB/T 9756-2018 (interior wall emulsion paint), and US EPA Architectural Coatings Rule. SEMITECH provides a Declaration of Conformity on request.

GMATT WB برای پوشش‌های پایه آبی — صفر VOC بدون عیب بذرزنی.

اصلاح سطح هیدروفیلیک: راه‌حل بذرزنی

پایداری ویسکوزیته هنگام رقیق‌سازی با آب

سازگاری با سیستم‌های 2K PU پایه آبی

صفر VOC و آمادگی مقرراتی برای انطباق جهانی

زمان استفاده از GMATT WB برای پوشش‌های پایه آبی

سوالات فنی متداول

راه‌حل پیشنهادی

Talk to a chemist about GMATT WB برای پوشش‌های پایه آبی — صفر VOC بدون عیب بذرزنی.

سناریو	گرید پیشنهادی	DFT هدف	بارگذاری
امولسیون معماری، صفر VOC	GMATT WB	20–35 µm	2.0–4.0 wt%
رویه 2K PU پایه آبی	GMATT WB	20–35 µm	3.0–5.0 wt%
کلیرکت چوب پایه آبی، شفافیت	GMATT WB	15–25 µm	2.5–4.0 wt%
رویه صنعتی پایه آبی	GMATT WB	25–45 µm	3.0–5.0 wt%
بیس تینتینگ با رقیق‌سازی آب	GMATT WB	20–35 µm	2.0–3.5 wt%