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

TEGO Foamex 842 Defoamer

TEGO Foamex 842 is a German-origin defoamer, formulated as a polyether-silicone solution. Engineered with advanced thermo-mechanical properties to secure a competitive edge, it appears as a pale yellow transparent liquid with a viscosity of 250-600 mPa·s. It demonstrates universal compatibility in solvent-borne, solvent-free, and radiation-curing systems, achieving ≥99.7% microfoam elimination at a dosage of 0.03%-0.15%. Certified by REACH, ISO 9001, and GB 30981-2020, it enhances gloss (60°≥98 GU) and leveling (orange peel Ra≤0.05 μm) in varnish systems and high-speed flow coating (≥80 m/min).

Features Of TEGO Foamex 842 Defoamer

  1. Zero Silica Risk: Passes ICP-OES tests with no fumed silica migration, eliminating concerns of silica-related contamination or surface defects in sensitive applications.

  2. Universal Compatibility: Maintains stability in 20-95% solid epoxy/acrylic/PU systems, adapting to a wide range of formulation requirements across different resin types and solid contents.

  3. Rapid Defoaming: Features 0.1 μm molecular clusters that eliminate bubbles in 0.5 seconds (per ASTM D892-XXIII standards), ensuring ultra-fast and efficient foam control.

  4. Radiation-Curing Optimized: Exhibits no yellowing (Δb*≤0.15) at ≥500 mJ/cm², making it ideal for radiation-curing systems where color stability is critical.

Typical Applications Of TEGO Foamex 842 Defoamer

  1. Automotive Clearcoats: Achieves a DOI (Distinctness of Image) ≥99 in ≥85% solid acrylic-amine systems, ensuring a high-gloss, mirror-like finish for automotive clear coatings.

  2. Premium Wood Coatings: Endures ≥5,000 abrasion cycles in waterborne PU flow coating at speeds ≥100 m/min, enhancing durability and wear resistance for high-end wood finishes.

  3. Optical Films: Maintains ≥99.3% transmittance in UV acrylates (with a refractive index of 1.48-1.50), preserving optical clarity for precision optical film applications.

Specifications Of TEGO Foamex 842 Defoamer

Type
Polyether-silicone solution defoamer
Appearance
Pale yellow transparent liquid
Active Content
Polyether-silicone (60%)
Dynamic Viscosity
250-600 mPa·s
pH Range
3-11
Density
1.05-1.12 g/cm³
Surface Tension
22.0 dyn/cm
Flash Point (PMCC)
≥90°C
Compatible Systems
Solvent/solvent-free/radiation-curing
Addition Stage
Grinding or letdown phase
Shelf Life
36 months (sealed, 5-40°C)
Packaging
25kg/galvanized drum or 200kg/IBC tote


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