BYK-1641 is an innovative polymer-based defoamer that is free of aromatics and silicones. It is specifically designed for radiation-curing systems, including wood coatings, industrial paints, printing inks, and adhesives. It delivers excellent foam suppression with spontaneous defoaming action, ensuring high transparency of end products and reducing the tendency for pinholes. This product enhances both the performance and aesthetic quality of formulations, making it an ideal choice for manufacturers seeking effective foam control in their applications.
Aromatic- and Silicone-Free: Formulated without aromatics or silicones, avoiding potential issues such as surface contamination, compatibility problems, or defects linked to these components.
Superior Foam Control: Provides excellent foam suppression along with spontaneous defoaming action, effectively addressing foam-related challenges during processing and application.
Enhances Transparency: Ensures high transparency of end products, making it suitable for applications where clarity is a critical requirement.
Reduces Pinholes: Minimizes the tendency for pinhole formation, improving surface smoothness and overall quality of formulations.
Baking Paints: Used in baking paint applications to eliminate boiling defects and control foam, ensuring a high-quality, smooth finish after curing.
Industrial Coatings: Ideal for a range of industrial coatings, enhancing their surface integrity, performance, and aesthetic appeal for consistent, reliable results across diverse applications.
Density (20 °C) | 0.80 g/ml |
Non-volatile content (10 minutes, 150 °C) | 40.5% |
Solvent | Isoparaffin |
Flash point | 37 °C |
Q1: What types of coating systems is BYK-1641 Defoamer best suited for?
A: BYK-1641 is especially effective in waterborne architectural and industrial coatings, including acrylic, styrene-acrylic, and vinyl acetate-based dispersions. It is also widely used in water-based wood finishes and low-VOC decorative paints where rapid foam breakdown and long-term storage stability are required.
Q2: How does BYK-1641 differ from silicone-based defoamers?
A: Unlike many silicone-based defoamers, BYK-1641 is a non-silicone, mineral oil–based formulation designed to minimize the risk of substrate wetting issues, craters, or recoatability problems. It offers excellent compatibility in sensitive waterborne systems while delivering reliable defoaming and deaeration performance without compromising surface appearance.
Q3: When should BYK-1641 be added during the manufacturing process?
A: For optimal performance, BYK-1641 is typically added during the let-down stage—after pigment grinding and before final adjustment of rheology or pH. This timing ensures efficient dispersion and avoids interference with high-shear pigment milling while maximizing foam control throughout production and storage.
Q4: Is BYK-1641 suitable for use in formulations requiring FDA compliance for indirect food contact?
A: BYK-1641 is not specifically designed or certified for food-contact applications. While it may be used in certain industrial maintenance or protective coatings, customers requiring regulatory compliance for food packaging or processing environments should consult BYK’s regulatory documentation and perform appropriate qualification testing.
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