German Technical Background VOK-920 Wax Auxiliaries Used in UV-curable Powder Coating Systems Replaces BYK-920

German technical background  VOK®-AP 920 wax auxiliary

VOK®-AP 920 micronized organic polymer for matting effects in solventborne, aqueous systems and printing inks. In UV-curable powder coating systems, surface hardness can be improved and matting properties can be achieved. 

Product Information 

Chemical composition 

Urea-formaldehyde resin 

Typical materialized data 

The data presented on this data page are typical values only and are not technical indicators of the product. 

Density: 1.47 g/ml 

Particle size distribution (laser diffraction, volume distribution): D50: 5 μm D90: 16 μm 

Purchase form: micronized 

Storage and transportation 

Temperature sensitive. Must be stored and transported at temperatures below 50 °C. 

Special considerations

VOK®-AP 920 may react with certain resins, such as moisture-curable polyurethanes. 

Application areas 

Coatings and printing inks 

Product features and benefits 

The additive has a matting effect while improving scratch resistance, metal scratch resistance and abrasive resistance. Recommended for solventborne and aqueous systems. 

Recommended use 

Architectural coatings

Industrial coatings

Coil coatings

Coatings for wood and furniture

Protective coatings 

Leather paint 

Printing inks and varnishes

Recommended dosage 

0.5-10 % additive dosage (purchased form) is based on the total formulation and depends on the desired gloss. 

The above recommended addition amount is for reference, and the suitable addition amount needs to be determined by a series of tests. 

Addition method and processing

It is instructed that the additive should be added at a terminal, moderate shear rate at the end of production. Powder coating product characteristics and benefits This additive is recommended for matting UV powder coatings, while also improving their surface hardness and thus increasing surface protection. 

Recommended use 

VOK®-AP 920 is recommended for all UV-curable powder coatings. In combination with VOK®-AP 950, it enhances matting effect. 

Recommended dosage 

The dosage of 2-8 % additive (purchased form) is based on the total formulation and depends on the desired gloss. 

The above recommended addition amount is for reference, and the suitable addition amount needs to be determined by a series of tests. 

Addition method and processing

It is instructed that the additive should be mixed with all components such as resin, curing agent, pigment and other additives at high speed stirring using a high-speed dispersing machine, and then all extruded and discharged.