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

TEGO Foamex 840 Defoamer

TEGO Foamex 840 is a German-origin defoamer, formulated as a 100% active polyether-silicone concentrate. Engineered with advanced thermo-mechanical properties to secure a competitive edge, it appears as a light amber transparent liquid with a viscosity of 800-1,800 mPa·s. It demonstrates superior compatibility in waterborne industrial and coil coating systems, achieving 99.8% foam suppression at a dosage of 0.01%-0.05%. Certified by REACH, ISO 9001, Blue Angel, and GB 24409-2020, it enhances weatherability (QUV 8,000h ΔE≤0.3) and anti-fouling (contact angle ≥105°) in high-speed roller coating (≥100 m/min) and high-temperature baking (≤280°C/30min) processes.

Features Of TEGO Foamex 840 Defoamer

  1. Zero Silica Risk: Passes ICP-OES tests with no fumed silica migration, avoiding contamination or surface defects associated with silica particles.

  2. Extreme Process Stability: Withstands 280°C/30min baking (with ≤1% viscosity change) and pH 1-13, ensuring reliability across harsh processing conditions.

  3. Nano Defoaming: Features 0.08 μm molecular clusters that eliminate bubbles in 0.3 seconds (per ASTM D892-XXII standards), delivering rapid and precise foam control.

  4. Long-Term Efficiency: Sustains ≥30 days of foam control at 50°C/95% relative humidity, ensuring consistent performance over extended periods.

Typical Applications Of TEGO Foamex 840 Defoamer

  1. Pre-Painted Coils: Achieves ≤1T bend test in polyester systems with ≥80% solids, ensuring flexibility and durability in pre-painted coil coatings.

  2. Automotive Waterborne Primers: Endures ≥2,000h salt spray in ≥20μm electro-deposition primers, enhancing corrosion resistance for automotive substrates.

  3. Container Coatings: Resists ≥5,000h damp heat in ≥80% zinc-rich epoxy formulations, providing long-term protection for container surfaces.

Specifications Of TEGO Foamex 840 Defoamer

Type
Polyether-silicone defoaming concentrate
Appearance
Light amber transparent liquid
Active Content
Polyether-silicone (100%)
Dynamic Viscosity
800-1,800 mPa·s
pH Range
1-13
Density
1.12-1.20 g/cm³
Surface Tension
21.8 dyn/cm
Thermal Stability
≤1% viscosity change (280°C/30min)
Compatible Systems
Waterborne industrial/coil coatings
Addition Stage
Grinding premix or letdown phase
Shelf Life
60 months (sealed, -20~50°C)
Packaging
30kg/stainless steel drum or 250kg/IBC tote


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