BYK-347 is a silicone surfactant for aqueous coatings, printing inks, and overprint varnishes. It significantly reduces surface tension, improving substrate wetting without increasing surface slip. It is suitable for systems without co-solvents and offers excellent recoatability in thin layers, particularly in automotive coatings.

Chemical Family: Polyether Siloxanes, Polysiloxanes

Labeling Claims: Not Listed In California Proposition 65

Features: Good Leveling, Improved Substrate Wetting, Recoatability, Surface Tension Reduction

Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Markets
Applications
Application Area
Coating End Applications
Use Level
0.1 - 1% (Printing Inks), 0.05 - 0.5% (Coatings)
Application Information

Coatings and Printing Inks
Special Features and Benefits

The additive produces a significant decrease in the surface tension of aqueous systems and therefore particularly improves substrate wetting and leveling. It only marginally, if at all, stabilizes foam and the recoatability is not impaired. BYK-347 is characterized by its good substrate wetting properties, particularly also with thin-layered application. The additive does not increase the surface slip. If a greater surface slip is required, we recommended that it is combined with a polysiloxane such as BYK-333.
Recommended Use
The additive is recommended for all aqueous coatings, printing inks and overprint varnishes, particularly also for formulations which do not contain co-solvents.

Recommended Levels
0.05-0.5% additive (as supplied) based on the total formulation in coatings. 
0.1-1% additive (as supplied) based on the total formulation in printing inks.
The above recommended levels can be used for orientation. Optimal dosage levels are determined through a series of laboratory tests.
Incorporation and Processing Instructions
It is preferable to add the additive to the finished formulation. However, it can be used at any stage during manufacture.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Density (at 20°C)1.02g/ml-
Active Substance100%-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Ignition Temperaturemin. 200°CDIN 51 794/ DIN prEN 14 522
Density (at 20°C)1.02g/cc4 (Oscillating U-tube, at 20°C)
Flash Pointmin. 100.00°C49 (Pensky-Martens)
Vapor Pressure (at 20°C)max. 1hPa-
Initial Boiling Pointmin. 200°CDerived
Melting Pointmax. 0°CDerived
pH Value (at 20°C, 10% Concentration)7--
ColorLight Brown--
Soluble inWater--
AppearanceLiquid--
Note

The additive is also suitable for systems that do not contain organic co-solvents. If the system contains increased quantities of co-solvents, the silicone surfactant will not be as effective. In such formulations, we recommend the use of a polysiloxane, e.g. BYK-333.

Composition Data

Polyether-modified siloxane

Regulatory & Compliance