FOAMSTAB 520
FOAMSTAB 520 is a high-performance, silicone-free polymeric defoamer and air-release additive specifically engineered for solvent-borne and solvent-free systems. It provides exceptional foam destruction during mixing and prevents microfoam entrapment in high-build PU, epoxy, and heavy-duty industrial coatings without causing surface defects or intercoat adhesion issues.
Key Performance Benefits
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Complete Defoaming & Air Release
Eliminates both macro-foam created during high-speed dispersion and microfoam trapped during application. -
Silicone-Free Assurance
Zero risk of cratering, fisheyes, or surface contamination, making it ideal for high-gloss recoatable finishes. -
Optimal Intercoat Adhesion
Maintains excellent adhesion between primer and topcoat layers in multi-layer coating systems. -
High-Build Efficiency
Prevents air entrapment in thick epoxy flooring and high-solids polyurethane coatings.
Recommended Applications
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Polyurethane (PU) Systems
2K solvent-borne and 100% solids PU industrial flooring and coating systems. -
Epoxy Formulations
Self-leveling epoxy flooring, protective coatings and high-solids primers. -
Industrial Coatings
Protective coatings, coil coatings, wood finishes and machinery lacquers. -
Solvent-Free Binders
High-build casting resins and structural adhesive systems.
Typical Physical Properties
| Property Parameter | Test Specification / Unit |
|---|---|
| Chemical Description | Solvent-free polymeric defoamer |
| Density (20°C) | 0.86 – 0.90 g/cm³ |
| Viscosity (25°C) | Low-to-medium viscosity liquid |
| Flash Point | > 100 °C |
| Solubility | Insoluble in water; soluble in organic solvents |
Dosage & Processing Guidelines
The recommended dosage rate is 0.1% to 0.8% calculated on the total weight of the formulation.
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Grinding Stage
Add 50–70% of the calculated dosage prior to pigment grinding or dispersion for optimum foam control. -
Let-Down Stage
Incorporate the remaining dosage into the resin matrix under sufficient shear to ensure uniform distribution. -
Pre-Testing
Due to formulation-specific compatibility, ladder testing is recommended to determine the optimum dosage level.
💡 Formulator Insight & Lab Tip
When replacing BYK 054 / 054T in high-clearance epoxy flooring or clear PU topcoats, FOAMSTAB 520 provides matching air-release speed without affecting film clarity or inducing haziness. For thick casting applications (>2mm thickness), split incorporation (50% in Part A resin during grind, 50% during final blending) yields optimal degassing performance.
Related Technical Articles & Case Studies
Eliminating Microfoam in High-Solids Epoxy Floorings
A technical guide on selecting silicone versus silicone-free additives for high-build epoxy flooring systems to achieve superior air release and surface finish.
Read ArticleHow to Replace BYK® 054 / 054T in 2K PU Coatings
Comparative laboratory data demonstrating de-aeration performance, recoatability, and surface tension profiles in demanding polyurethane coating systems.
Read ArticlePreventing Pinholes in Industrial Protective Coatings
Best practices for incorporating polyether and polymeric air-release additives during high-speed grinding to eliminate pinholes and improve coating quality.
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