German technical background VOK-347 leveling agent Used in waterborne coatings to improve substrate wettability replaces BYK-347

German technical background  VOK®-SL 347 leveling agent

VOK®-SL 347 silicone surfactant for waterborne coatings, printing inks and varnishes that significantly reduces surface tension and improves substrate wettability. Does not increase surface slip. Suitable for co-solvent-free systems. It has particularly good recoating properties for thin coatings (automotive coatings). 

Product information 

Chemical composition 

Polyether-modified siloxanes 

Typical physicochemical data 

The data presented on this data page is typical and not a product specification. 

Effective Serving Size: 100% 

Density (20 °C): 1.02 g/ml 

Special considerations 

The additive is also suitable for systems that do not contain organic co-solvents. If the co-solvent content in the system is increasing, the silicone surfactant will gradually lose its effect. In such formulations, we recommend the use of polysiloxane additives, e.g. VOK®-SL 333. 

Application areas 

Coatings and printing inks 

Product features and benefits 

The additive significantly reduces the surface tension of aqueous systems and therefore significantly improves the wetting and leveling of the substrate. May cause slight foam stabilization, but does not affect recoatability. VOK®-SL 347 has very good substrate wettability, especially for thin coatings. The additive does not increase surface slip. For better surface slip, it is recommended to use polysiloxane additives such as VOK®-SL 333. 

Recommended Use 

The additive is recommended for all water-based coatings, printing inks and overprint varnishes, especially in co-solvent-free formulations.

Recommended dosage 

0.05-0.5% additive dosage (form of supply) is based on the total coating formulation.

0.1-1% additive dosage (purchased form) is based on the total printing ink formulation. 

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

Addition method and processing guidance 

This additive can be added at any stage of production, but we recommend adding it later.