German Technical Background VOK-R 605 Rheological Agent It Can Improve Leveling and Deaeration Replaces BYK-R 605

German technical background  VOK®-R 605 rheological agent

VOK®-R 605 liquid rheology additive for enhanced rheological efficiency of pyrogenic silica in plastic applications such as vinyl esters, epoxy resins, unsaturated polyester resins and gel coats. It makes pyrogenic silica easier to add, prevents delamination, and increases or stabilizes thixotropic behavior.

Product information

Chemical composition

Polyhydroxycarboxylic acid amide solution

Typical physicochemical data

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

Density (20°C): 0.93g/ml

Refractive index (20°C): 1.496

Gardner chromaticity:<10

Non-volatile content (20min., 150°C) 52%

Flash point: 29 °c

To find out the food regulatory status of this product, please contact our Product Safety Department or visit the website

Storage and transportation

Modified products may become delamination or cloudiness. Disperse evenly before use. Product performance is not affected.

Application areas

Normal temperature curing resin system

Product features and benefits

VOK®-R 605 is used for three-dimensional network structures containing fusperous silica or organic layered silicates to improve thixotropy. As a result, even low silica or layered silicate dosages can achieve sufficiently high sagging resistance and improved leveling and deaeration.

A small amount of VOK®-R 605 (5% based on silica) stabilizes silica in laminate resins and prevents delamination of the resin during storage.

In vinyl ester resins, VOK®-R 605 activates hydrophilic silica.

The additive is used in a variety of resins, including polyether polyols, to prevent filler settling during storage.

In polyether polyols VOK®-R 605 g is used to stabilize molecular sieves such as zeolite.

Recommended dosage

The dosage of additives (form of purchase) is based on:

Pyrogenic silica in vinyl ester resin: 20-50%

Pyrogenic silica in other resins: 10-30%

organic layered silicates (organic clays); 5-20%

Inorganic filler: 0.5-2%

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

Under continuous stirring conditions, the additive should be added to the resin before silica, layered silicate or filler is added. This additive can also be added later.

Adhesives & sealants

Product features and benefits

VOK®-R 605 is a thixotropic synergist for polyurethanes and acrylates that exhibits thixotropy through the use of pyrogenic silica or organic layered silicates (organoclays). Enhances hydrogen bonds of silica and layered silicates, resulting in increased thixotropy. Therefore, a low amount of silica or layered silicate can also obtain sufficiently high flow resistance and improve leveling and deaeration.

Recommended dosage

10-30% additive dosage (purchased form) is based on pyrogenic silica or organic layered silicates.

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

Under continuous stirring conditions, the additive should be added to the resin before silica/layered silicate is added. This additive can also be added later.