BYK-326 is a silicone-containing surface additive for solvent-borne, aqueous, and 100% coatings. It offers a slight reduction in surface tension, a slight increase in surface slip, and is particularly suitable for achieving good leveling.

Chemical Family: Polydimethylsiloxanes, Siloxanes

Labeling Claims: Not Listed In California Proposition 65

Features: Defoaming, Good Compatibility, Good Leveling, Improved Slip, Improved Substrate Wetting, Surface Tension Reduction, Transparency

End Uses: Clearcoat, Solventborne Coating, Waterborne Coating

Enhanced TDS

Identification & Functionality

Features & Benefits

Applications & Uses

Markets
Applications
Application Area
Coating End Applications
Use Level
0.05 - 0.5% (Coatings Industry)
Application Information

Coatings Industry
Special Features and Benefits

The additive causes only a slight reduction in the surface tension of the coating systems and has a positive effect  on leveling. As a result of its broad compatibility, the high transparency of most clear coating systems is maintained and it can therefore be easily used in clear coatings for automotive, for example. In epoxy clear coatings for flooring, the additive combines high transparency, improved substrate wetting, and mild defoaming properties. Due to its special molecular structure, BYK-326 does not crystallize, even under -18 °C, which makes it easy to use at low temperatures.
Recommended Use
The additive is recommended for all solvent-borne, aqueous, and 100% coatings.
Recommended Levels
0.05-0.5% additive (as supplied) based on the 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
The additive can be incorporated during any stage of the production process, including post-addition.
Special Note
Unlike so-called silicone oils, this additive is very user-friendly. However, before use, one should determine in a test series whether foam is stabilized in certain systems. Similarly, the recoatability and cratering should be investigated.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Density (at 20°C)1.02g/ml-
Flash Pointmin. 100°C-
Non Volatile Mattermin. 96%-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
AppearanceMolten form--
ColorLight brown--
Density (at 20°C)approx. 1.015g/cc4 (Oscillating U-tube, at 20°C)
Dynamic Viscosity (at 20°C)approx. 1,400mPa.sP/K 20°C
Flash Pointmin. 100°C49 (Pensky-Martens)
Ignition Temperaturemin. 200°CDIN 51 794/ DIN prEN 14 522
Immiscible inWater--
Initial Boiling Pointmin. 200°CDerived
Melting Pointmax. 32°FDerived
pH Value (Concentration - 1 % 20°C)6--
Vapor Pressure (at 20°C)max. 0.1hPaDerived
Composition Data

Polyether-modified polymethylalkylsiloxane

Regulatory & Compliance

Chemical Inventories
OEM Specifications