German technical background  VOK®-SL 307 leveling agent

VOK® -SL307 contains silicone surface additives for solvent-free and solventborne coating systems, printing inks and adhesive systems that significantly reduce surface tension. Good substrate wetting prevents cratering and increases surface slip. It is a solvent-free version of VOK® -SL 306. 

Product information 

Chemical composition 

Polyether modified polydimethylsiloxane 

Typical physicochemical data 

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

Density (20 °C): 1.03 g/ml 

Application areas 

Printing inks and varnishes 

Product features and benefits 

The additive significantly reduces the surface tension of the system. As a result, substrate wettability is significantly improved and cratering is prevented. In addition, the additive increases surface slip and shine. 

VOK® -SL 307 is a highly effective silicone additive for wetting demanding substrates and, due to its solvent-free absence, is particularly suitable for systems requiring solvent-free additives or intermediates requiring special solvents. 

Recommended Use 

Recommended for a wide range of printing inks and overprint varnishes. 

Recommended dosage 0.1-1.0% Additive dosage (purchased form) is based on total formulation. 

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 

The additive can be added at any stage of the production process, including post-adding. For easy addition, dilute before adding.

Special considerations 

Compared to silicone fluids, this additive is easier to use. However, before use, a series of experiments should be carried out to confirm whether the additive will stabilize the foam in certain systems. In addition, recoating and craters need to be examined. 

Coatings industry 

Product features and benefits 

The additive significantly reduces the surface tension of coating systems and is an efficient defoamer for wetting demanding substrates. The additive prevents cratering, increases gloss and surface slip. VOK® -307 has properties comparable to VOK® -306 and, because it does not contain solvents, it is particularly suitable for systems requiring solvent-free additives or intermediates requiring special solvents. 

Recommended Use 

The additive is particularly recommended for a wide range of solventborne coatings and can also be used in aqueous systems. 

Recommended dosage 

0.01-0.15% Additive dosage (purchased form) is based on total formulation. 

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 

The additive can be added at any stage of the production process, including post-adding. To facilitate addition, dilute before adding.

Special considerations 

Compared to silicone fluids, this additive is used. However, before use, a series of experiments should be carried out to confirm whether the additive will stabilize the foam in certain systems. In addition, recoating and craters need to be examined.

Adhesives & sealants 

Product Features & Benefits VOK® -307 is a highly effective silicone additive that strongly reduces surface tension. As a result, it improves wetting of demanding substrates. 

Recommended Use 

It is particularly recommended for substrate wetting of adhesive systems based on polyurethane, epoxy and acrylic resins. 

Recommended dosage 

0.01-0.15% additives (supplied form) based on total formulation. 

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 

The additive can be added at any stage of the production process, including post-adding. 

Special considerations 

Compared to silicone fluids, this additive is used. However, before use, a series of experiments should be carried out to confirm whether the additive will stabilize the foam in certain systems. In addition, recoating and craters need to be examined.

Adhesives & sealants 

Product Features & Benefits VOK® -307 is a highly effective silicone additive that strongly reduces surface tension. As a result, it improves wetting of demanding substrates. 

Recommended Use 

It is particularly recommended for substrate wetting of adhesive systems based on polyurethane, epoxy and acrylic resins. 

Recommended dosage 

0.01-0.15% additives (supplied form) based on total formulation. 

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 

The additive can be added at any stage of the production process, including post-adding. 

Special instructions 

Unlike so-called silicone fluids, the additive is very convenient to use. Nevertheless, test it in a specific system for adhesion before use.