BYK-323 is a silicone-containing surface additive for solvent-borne coating systems. It provides a slight reduction in surface tension, a slight increase in surface slip, good leveling, and defoaming properties. It is thermostable up to 250°C.

Chemical Family: Polydimethylsiloxanes, Siloxanes

Labeling Claims: Not Listed In California Proposition 65

Compatible Polymers & Resins: Polyurethanes (PU), Unsaturated Polyester (UPE)

Features: Defoaming, Good Leveling, Heat Stable, Improved Slip, Low Foam Stabilization, Matting, Surface Tension Reduction

End Uses: Metal Coating, Solventborne Coating, Solventless & High Solids Coating

Enhanced TDS

Identification & Functionality

Features & Benefits

Labeling Claims
CASE Ingredients Features
Special Features and Benefits
  • The additive provides a slight reduction of the surface tension of coating systems.
  • BYK-323 is a silicone leveling additive which has a defoaming effect/does not stabilize or only slightly stabilizes the foam depending on the polarity of the coating system.
  • BYK-323 is thermostable up to 250 °C and does not negatively impact the intercoat adhesion.
  • In matt coatings it is used to orientate the matting agent and in high solid systems that are difficult to matt (polyurethane/acid-curing/unsaturated polyester) its use gives optimum matting agent orientation without shining up.
  • In flow coatings, BYK 323 stabilizes the flow curtain, and in metallic coatings it ensures consistent orientation of the aluminum pigments.
Special Note
  • Unlike so-called silicone oils, this additive is very user-friendly.
  • Nevertheless, before use it should be determined in a series of tests whether foam is stabilized in certain systems.
  • Similarly, the recoatability and cratering should be checked.

Applications & Uses

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Density (at 20°C)0.99g/ml-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
AppearanceLiquid--
ColorLight brown--
Density (at 20°C)0.99g/cc4 (Oscillating U-tube, at 20°C)
Flash Pointmin. 100.00°C49 (Pensky-Martens)
Ignition Temperaturemin. 200°CDIN 51794
Immiscible inWater--
Initial Boiling Pointmin. 200°CDerived
Melting Pointmax. 32°FDerived
pH Value (Concentration - 1 % 20°C)7--
Vapor Pressure (at 20.00°C)max. 1hPaDerived
Composition Data

Aralkyl-modified polymethylalkylsiloxane

Regulatory & Compliance

Chemical Inventories
OEM Specifications