German technical background VOK-375 leveling agent Used to reduce surface tension in aqueous systems replaces BYK-375

German technical background VOK-375 leveling agent

VOK-375 Silicone surface additive for aqueous systems with hydroxyl functional groups and medium reduced surface tension. 

Product information 

Chemical composition 

Polyether polyester modified polydimethylsiloxane solution containing hydroxyl functional groups 

Typical physicochemical data 

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

Density (20 °C): 0.98 g/ml 

Non-volatile (60 minutes, 105 °C): 25% 

Solvent: Dipropylene glycol methyl ether 

Flash point: 78 °C 

Hydroxyl value (solid): ca. 30 mg KOH/g 

Storage and transportation 

Delamination and turbidity may occur at temperatures below 10°C. Heat to 50-60 °C until the product is clear again and stir well. 

Special reminder

Due to the crosslinkability of the additive itself, the additive can be cross-linked with the binder and thus anchored to the coating surface. Compared with conventional non-reactive silicone additives, the additive has a better long-acting version. When used outdoors, the surface coating will gradually lose during atmospheric aging, and the additives will also disappear with the loss of the surface layer. Therefore, the longevity of a particular binder must be evaluated. If the additive is used in a system that can be crosslinked, please note that when the coating needs to be reapplied, it must be sanded carefully and evenly with sandpaper to ensure adequate adhesion