German technical background  VOK®-405 rheology  agent 

VOK®-405 Liquid rheology agent for oil-based coatings to improve the efficacy of gas-silicon. It makes gas silicon more convenient to join, anti-delamination, stable and improves the rheological effect.

Product Data Chemical composition Polyhydroxycarboxylate amide solution Typical physical and chemical data The data given on this data page are typical values and are not product specifications. Density (20 °C): 0.93 g/ml Non-volatile (20 min., 150 °C): 52% Solvent: xylene/alkyl benzene/isobutanol 5/4/1 flash point: 29 °C Storage and transportation 

Delamination or turbidity may occur. Heat to 20-30°C and mix thoroughly, the product effect is not affected. 

Application information 

Coatings industry 

Features and benefits 

VOK®-405 can act like a dispersant, making it easier to add gas-silicon. It is its rheological effect that stabilizes and improves. Under the same shear conditions, the effect is more pronounced in varnishes than in pigments. 

It reduces and prevents the precipitation of pyrogenic silica in coatings. VOK®-405 is best suited for solventborne coating systems based on polyester, acrylic and alkyd containing pyrogenic silica. Fumed silica must be at least partially hydrophilic. 

With the addition of VOK®-405, the binder will have better thixotropy and thixotropic resin systems will also exhibit better thixotropy.