BYK-1880

Coatings industry
Special features and benefits
BYK-1880 is a highly effective, solvent-free, and silicone-containing defoamer. The additive has been especially designed for 2-pack high-solid PUR systems that are difficult to defoam and are applied by airless or air-assisted airless spray. Furthermore, the product can also be used in conventional spray-applied systems and is widely applicable in many solvent-borne and solvent-free coatings (e.g. alkyds and 2-pack epoxy systems). The additive exhibits strong defoaming even in higher film
thicknesses and is particularly effective against microfoam. The defoamer is also excellent against macrofoam. BYK-1880 shows no negative influence on film properties such as gloss, leveling, or adhesion.

Recommended levels
0.3–1.0% additive (as supplied) based on the total formulation, in exceptional cases up to 1.5%.
The above recommended levels can be used for orientation. The optimum dosage should be determined by application-related test series.
Incorporation and processing instructions
For best effectiveness, the defoamer should be incorporated into the letdown of the formulation.
For sensitive systems, which tend to have surface defects, 2/3 of the amount should be added to the millbase and 1/3 to the letdown.

The cyclic siloxane content D4/D5/D6 of BYK-1880 is less than 0.1% in each case, therefore the SVHC label is not required in the safety data sheet.

Modified polysiloxane copolymer

Storage and transportation between 0 °C and 50 °C. Separation possible. Stir well before use.