BYK-021 is a VOC-free, silicone-containing defoamer for aqueous high-gloss emulsion systems, dispersion adhesives, printing inks, and overprint varnishes. It is particularly suitable for high-gloss and satin-gloss systems and for airless applications.

Functions: Defoamer

Chemical Family: Polysiloxanes

End Uses: Acrylic Adhesives, Printing Ink, Varnishes, Waterborne Adhesive, Waterborne Coating

Compatible Polymers & Resins: Polyurethane Acrylates (PUA)

Labeling Claims: Volatile Organic Compound (VOC)-free

Enhanced TDS

Identification & Functionality

Chemical Family
Manufactured By
CASE Ingredients Functions
Technologies
Product Families

Features & Benefits

Labeling Claims
CASE Ingredients Features

Applications & Uses

Markets
Applications
Application Area
Compatible Polymers & Resins
Adhesive & Sealant End Applications
Coating End Applications
Ink & Toner End Applications
Use Level
0.05 - 0.5% (Adhesives), 0.05 - 0.8% (Printing Inks and Overprint Varnishes), 0.1 - 0.8% (Coatings Industry)
Application Information

Printing Inks and Overprint Varnishes
Special Features and Benefits
BYK-021 is recommended for defoaming printing inks and overprint varnishes based on styrene acrylate, acrylate or acrylate/polyurethane.
Recommended Levels
0.05-0.8% additive (as supplied) based upon total formulation.
The above recommended levels can be used for orientation. Optimal levels are determined through a series of laboratory tests.
Incorporation and Processing Instructions
Due to its high incompatibility, the defoamer must be incorporated at high shear forces to ensure a good distribution. Otherwise defects may occur in the system.

 

Coatings Industry
Special Features and Benefits
BYK-021 is particularly suitable for pigmented high gloss emulsion systems based on styrene acrylate, acrylate or acrylate/polyurethane with a pigment volume concentration of 18-25. The additive defoams particularly high-gloss and satin-gloss systems, even in airless application.
Recommended Levels
0.1-0.8% additive (as supplied) based upon total formulation.
The above recommended levels can be used for orientation. Optimal levels are determined through a series of laboratory tests.
Incorporation and Processing Instructions
Due to its high incompatibility, the defoamer must be incorporated at high shear forces to ensure a good distribution. Otherwise defects may occur in the system.

 

Adhesives
Special Features and Benefits
BYK-021 is recommended for defoaming aqueous acrylate-based adhesives.
Recommended Levels
0.05-0.5% additive (as supplied) based upon total formulation.
The above recommended levels can be used for orientation. Optimal levels are determined through a series of laboratory tests.
Incorporation and Processing Instructions
Due to its high incompatibility, the defoamer must be incorporated at high shear forces to ensure a good distribution. Otherwise defects may occur in the system.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Density (at 20°C)1g/ml-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Auto Ignition Tempertauremin. 200°CDIN 51794
Flash Pointmin. 100.00°CPensky-Martens
Initial Boiling Pointmin. 100.00°CDerived
Melting Pointmax. 0°CDerived
Density (at 20°C)0.995g/cm³Oscillating U-tube
Vapour Pressure (at 20°C)max. 1hPaDerived
AppearanceDispersion--
ColorOff-white--
Flammability (liquids)Sustains Combustion--
Immiscible InWater--
pH (at 20°C, Concentration: 1%)7-Universal pH-Value Indicator
Composition Data

Mixture of foam-destroying polysiloxanes and hydrophobic solids in polyglycol.

Regulatory & Compliance

OEM Specifications

Storage & Handling

Storage Conditions

Separation may occur. Mix well before use. To be stored and transported at a temperature below 40 °C.