BYK-A 525 is a silicone-containing defoamer and air release agent designed for potting compounds, sealants, and adhesives based on polyurethane and epoxy systems. It enhances leveling and wetting properties while effectively eliminating foam. This liquid additive is compatible with epoxies and polyurethanes.

Functions: Defoamer

Chemical Family: Polysiloxanes

Compatible Polymers & Resins: Epoxies (EP), Polyurethanes (PU)

Enhanced TDS

Identification & Functionality

Chemical Family
Manufactured By
CASE Ingredients Functions
Technologies
Product Families

Features & Benefits

CASE Ingredients Features

Applications & Uses

Compatible Polymers & Resins
Use Level
0.3 - 1% additive (total formulation for Ambient Curing Systems), 0.1 - 0.5% (additive total formulation for Adhesives & Sealants)
Product Applications

Adhesives & Sealants
Special Features and Benefits

Prevents foam and bubble formation during manufacturing and application. It demonstrates excellent air release characteristics in mineral-filled systems. It additionally improves wetting of quartz and glass fibers.

Recommended Use
Especially recommended for systems on polyurethane and epoxy resin basis.

Recommended Levels
0.1-0.5% 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 : Incorporate into resin before adding the other components.

Ambient Curing Systems
Special Features and Benefits

Acts as a defoamer/air release agent during production and application. Also reduces surface tension, improves leveling and wetting and prevents Bénard cell formation. The decrease in surface tension can be reduced by lowering the polarity of the binder system.

Recommended Use
Especially recommended for systems on polyurethane and epoxy resin basis.

Recommended Levels
0.3-1% 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 : Incorporate into resin before adding the other components. Can also be added to complete systems.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Flash Point38°C-
Density (at 20°C)0.86g/ml-
Solvents
ValueUnitsTest Method / Conditions
White spirit/Methoxypropylacetate9/1--
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Kinematic Viscosity (at 20°C)25mm²/s-
Ignition Temperaturemin. 200°CDIN 51 794/ DIN prEN 14 522
Density (at 20°C)0.86g/cc4 (Oscillating U-tube, at 20°C)
Lower Explosion Limit0.6%V-
Explosion Limits (Upper)12%V-
Flash Point38°C48 (Abel-Pensky)
Vapor Pressure (at 20°C)3hPaDerived
Initial Boiling Point144°CDerived
Melting Pointmax. 0°CDerived
pH Value (at 20°C, 1% Concentration)5-Universal pH Value Indicator
ColorColorless--
Immiscible inWater--
AppearanceLiquid--