German technical background  VOK® -SL 323 leveling agent

VOK®-SL 323 is suitable for silicone surface additives in solventborne coating systems that slightly reduce surface tension and slip. 

Product information 

Chemical composition 

Aryl alkyl modified alkyl siloxane. 

Typical physical data The data given on this data page is only typical values, not technical specifications of the product. 

Density (20 °C): 0.99 g/ml 

Application areas 

Coatings industry 

Features and benefits 

The additive slightly reduces the surface tension of the coating system and is a silicone leveling agent with a defoaming effect. Its defoaming or antifoaming effect depends on the polarity of the coating system. VOK-323 is a very thermally stable silicone additive that does not affect the interlayer adhesion of the coating even at 250°C. In matte coatings, VOK-323 has matting agent orientation, and in high solids polyurethane, acid-curing unsaturated polyester coatings, VOK- 323 provides good matting agent orientation and does not cause gloss improvement. VOK- 323 also provides curtain stability in coating systems, and in metallic flash coatings, VOK-323 contributes to the orientation of matting and aluminum powders. 

Recommended Use 

The coating is particularly recommended for solventborne systems. 

Recommended dosage 

0.01-0.4 % additive dosage (form of supply) based on total formulation. 

The above recommended dosage is for reference, and the appropriate dosage needs to be determined through a series of tests. 

Addition method and processing guidance 

The additive can be added at any stage, including post-adding. 

Special reminder 

Unlike ordinary silicone fluids, the additive is "user safe". However, before use, a series of tests should be carried out to confirm whether the additive is foam stabilizing, in addition to evaluating its recoating and crater tendencies.