Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

TEGO Foamex 825 Defoamer

TEGO Foamex 825 is a German-origin defoamer, formulated as a polyether-silicone/hydrophobic silica composite. Engineered with advanced thermo-mechanical properties to secure a competitive edge, it appears as a milky homogeneous liquid with a viscosity of 300-800 mPa·s. It maintains stable activity under pH 3-11 and temperatures ≤60°C, achieving 80% foam suppression at a dosage of 0.05%-0.15%. Certified by REACH, ISO 9001, and GB 30981-2020, it enhances transparency (haze ≤1.8%) and leveling (Ra≤0.25 μm) in waterborne wood coatings and leather finishes.

Features Of TEGO Foamex 825 Defoamer

  1. Nano Hybrid Technology: Equipped with 1.5 μm composite particles that collapse foam in 5 seconds (per DIN 53941 standards), ensuring efficient foam control through advanced particle design.

  2. Full Compatibility: Stable in 30-75% PVC (pigment volume concentration) styrene-acrylic systems and 40-60% solid PU (polyurethane) formulations, adapting to diverse water-based coating types.

  3. Self-Emulsifying Design: Allows direct addition during the grinding process without pre-dispersion, simplifying production workflows and reducing processing steps.

Typical Applications Of TEGO Foamex 825 Defoamer

  1. Waterborne Wood Varnishes: Achieves ≥93 GU (Gloss Unit) gloss in nitrocellulose (NC) systems with ≥35% solids, enhancing the visual appeal of wood finishes.

  2. Automotive Refinish: Delivers a DOI (Distinctness of Image) ≥90 in ≥80 μm 3C2B (three-coat two-bake) processes, ensuring high-quality finishes in automotive refinishing.

  3. Leather Finishes: Enhances moisture permeability to ≥7,500 g/m²/24h, improving the breathability and comfort of leather products.

Specifications Of TEGO Foamex 825 Defoamer

Type
Polyether-silicone/silica composite emulsion
Appearance
Milky homogeneous liquid
Active Content
Polyether-silicone + hydrophobic silica (18%)
Dynamic Viscosity
300-800 mPa·s
pH Range
3-11
Density
1.01-1.07 g/cm³
Surface Tension
23.5 dyn/cm
Freeze-Thaw Test
Passed -10°C/5 cycles
Addition Stage
Early grinding or letdown phase
Shelf Life
24 months (sealed, 5-40°C)
Packaging
25kg/PE drum or 200kg/IBC tote



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