BYK-370 is a polyester-modified, silicone-containing surface additive for solvent-borne coating systems and UP gel coats. It is OH-functional and effectively reduces surface tension while offering good leveling, improved substrate wetting, and excellent weather resistance. Additionally, it provides solvent resistance, good antiblocking properties, and is compatible with wood substrates. It is in liquid form and contains various chemical components such as ethylbenzene, cyclohexanone, 2-phenoxyethanol, and xylene.

Functions: Surface Modifier

Chemical Family: Polydimethylsiloxanes

End Uses: Can Coating, Solventborne Coating, Wood Coating

Features: Good Antiblocking Properties, Good Leveling, Improved Substrate Wetting, Solvent Resistance, Weather Resistance

Enhanced TDS

Identification & Functionality

Chemical Family
Manufactured By
CASE Ingredients Functions
Technologies
Product Families

Features & Benefits

Applications & Uses

Markets
Applications
Compatible Substrates & Surfaces
Coating End Applications
Product Applications

Coatings Industry
Special Features and Benefits

Due to its high surface activity, the additive accumulates on the surface of the coating. Its reactivity allows it to be incorporated into the polymer network and therefore to be anchored in the coating surface. BYK-370 improves surface slip, solvent and weather resistance, anti-blocking and reduces susceptibility to dirt. If the additive is fixed in the coating surface via its reactive groups, these properties remain present longer than with conventional, non-reactive silicones. The additive also reduces surface tension, which improves substrate wetting. It improves leveling and prevents the formation of Bénard cells.

Recommended Use: BYK-370 reacts with the resin via primary OH-groups and is primarily used in solvent-borne two-pack polyurethane systems. It may also react with the following binders: Alkyd/melamine, polyester/melamine, acrylate/melamine, self-crosslinking acrylates, epoxides. It is preferably used in wood and furniture coatings, leather coatings as well as can coatings.

Properties

Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
OH Value (Solids)35mg KOH/g-
Flash Point25°C-
Non Volatile Matter (at 150°C in 10 min)25%-
Density (at 20°C)0.92g/ml-
Solvents
ValueUnitsTest Method / Conditions
Monophenyl Glycol7--
Cyclohexanone7--
Alkylbenzenes11--
Xylene75--
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Kinematic Viscosity (at 40°C)approx. 1mm²/s-
Ignition Temperaturemin. 392°FDIN 51 794/ DIN prEN 14 522
Density (at 20°C)0.92g/cc4 (Oscillating U-tube, at 20°C)
Lower Explosion Limit1%V-
Explosion Limits (Upper)9.4%V-
Flash Point77°F48 (Abel-Pensky)
Vapor Pressure (at 20°C)5hPaDerived
Initial Boiling Point278.6°FDerived
Melting Pointmax. 32°FDerived
pH Value (at 20°C, 1% Concentration)6-Universal pH Value Indicator
OdorAromatic--
ColorLight yellow--
AppearanceLiquid--
Immiscible inWater--

Storage & Handling

Storage Information

Mix well before use. Separation or turbidity may occur at temperatures below 5°C. Warm to 20°C and mix well.