Name: Fluorosilicone Defoamer FSD-5
Brand: Coatingsink
SKU: fluorosilicone-defoamer-fsd
Availability: InStock

Question 1

What makes FSD-5 suitable for high-pH coating systems?

Accepted Answer

FSD-5 is based on fluorosilicone chemistry that remains stable under alkaline conditions up to pH 12, unlike conventional dimethylsilicone defoamers which can hydrolyze and lose efficacy. This makes it effective in epoxy and polyurethane topcoats formulated at elevated pH where conventional defoamers fail.

Question 2

Can FSD-5 be used in high-temperature baking and curing systems?

Accepted Answer

Yes. FSD-5 is thermally stable up to 200°C, making it suitable for baking enamels, high-solids industrial coatings, and coil coatings with oven-cure cycles. The fluorosilicone backbone resists thermal degradation that would compromise conventional silicone or mineral oil defoamers at elevated cure temperatures.

Question 3

What is the recommended addition method for anti-corrosion primers?

Accepted Answer

For anti-corrosion primers and marine topcoats, add FSD-5 at 0.05–0.3% by weight during the grind or let-down stage. Dosages up to 0.5% can be tested for systems with severe foam challenges, but should be evaluated for any effect on intercoat adhesion and gloss before adoption.

pH (1% aq.)	6.5–7.5
Active Content	100%
Density (25°C)	1.05 g/ml
Viscosity (25°C)	500–900 mPa·s
Recommended Dosage	0.05–0.3%

Fluorosilicone Defoamer FSD-5

Specifications

FAQ

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