BYK 104s

On-Product Information of BYK 104s

Chemical composition

Solution of low molecular weight unsaturated polycarboxylate polymer with polysiloxane copolymers.

Typical materialized data

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

Acid value: 150 mgkoh/ g density (20°c): 0.95g / ml

Non-volatile fraction (10 min., 150 °c): 50% solvent: Xylene / diisobutylketone 9 / 1

Flash point: 28°c

Current status of food contact regulations

To understand the food contact regulatory status of the product, please contact our product safety department or visit the website at www. byk.com.

Storage and transportation

Stri nation and turbidity may occur during transport and storage, heated to 30-60 ˚ c and fully mixing before use.

Special reminder

The compatibility is limited in coating systems with gasoline solvent or diluted with gasoline solvent. The auxiliary agent also contains no polysiloxane copolymer variety, namely BYK-P 104.

Application Area of BYK 104s

Coating industry

Features and advantages

BYK-P104 s is particularly suitable for medium to high polar coating systems to prevent the floating color of titanium dioxide when mixed with color pigments. It has limited compatibility with gasoline solvents.

In many cases, corrosion protection is improved when used in preservative primers. BYK-P104 s also contains small amounts of polysiloxane copolymer to improve floating hair behavior.

This ingredient prevents the formation of the benard vortex, increasing the smooth and smooth surface, and the orientation of the extinction powder and aluminum powder pigments. In most cases, there is no need to add additional silicone additives necessary in conventional formulas.

Suggested dosage

The amount of additives (purchased form) is based on:

Inorganic pigment: 3-10% titanium dioxide: 0.5-2.5% organic pigments: 10-20%

The above recommended amount is for reference, and the optimal amount should be determined through a series of tests.

Add method and processing guidance

To achieve optimal performance, the additives must be added to the abrasives and then to the pigment.

BYK 104s – Frequently Asked Questions (FAQ)

Q1: What is BYK 104s primarily used for in coating formulations?

A: BYK 104s is a silicone-free, polyether-modified polymethylsiloxane additive designed to improve substrate wetting and leveling in solventborne and high-solids coatings, especially where silicone contamination must be avoided—such as in automotive refinish or plastic coatings requiring good intercoat adhesion.

Q2: Is BYK 104s compatible with waterborne systems?

A: While BYK 104s is formulated for solventborne and high-solids systems, it may be incorporated into some waterborne coatings with careful pre-dilution and compatibility testing. However, its performance and stability are not optimized for aqueous media, and alternative additives from the BYK portfolio are recommended for fully waterborne applications.

Q3: How should BYK 104s be incorporated into a formulation?

A: It is typically added during the let-down stage under moderate agitation. To ensure uniform dispersion, pre-dilution with a compatible solvent (e.g., xylene, butyl acetate or propylene glycol monomethyl ether acetate) is recommended before addition to the main batch.

Q4: Does BYK 104s affect film hardness or recoatability?

A: When used at recommended dosage levels, BYK 104s does not significantly impair film hardness development or intercoat adhesion. Its silicone-free nature helps maintain reliable recoatability—particularly important in multi-layer industrial and automotive repair applications.