Name: Silicone-Free Polyether Defoamer SFD-30
Brand: Coatingsink
SKU: silicone-free-defoamer-polyether-sfd
Availability: InStock

Question 1

Why is a silicone-free defoamer required in adhesive and sealant formulations?

Accepted Answer

Silicone transfer from defoamers in adhesive systems causes fish-eyes in overcoated substrates, inter-coat adhesion failures, and wettability loss on painted or primed surfaces. SFD-30 eliminates this contamination risk entirely, making it suitable for automotive assembly, electronics potting, and painted-surface bonding where silicone-free specifications are mandatory.

Question 2

At what dosage does SFD-30 perform optimally in solvent-free polyurethane sealants?

Accepted Answer

Typically 0.3–0.6% w/w, added under moderate shear during pre-mix before isocyanate incorporation. Loadings above 1.0% may extend open time in moisture-cure systems and can reduce tensile strength at cure. Always conduct compatibility tests in the specific PU backbone at target addition levels.

Question 3

How does the cloud point of SFD-30 affect its performance in waterborne systems?

Accepted Answer

The cloud point at 35–45°C marks the temperature at which the polyether becomes water-insoluble and defoaming activity peaks. In waterborne formulations applied at ambient temperature, SFD-30 is most active near the film surface during drying, aligning defoaming efficacy with the window when foam elimination matters most.

Active Content	≥ 95%
Density (25°C)	1.03 g/ml
Viscosity (25°C)	1000–2000 mPa·s
pH (10% solution)	6.5–7.5
Cloud Point (1% aq.)	35–45°C

Silicone-Free Polyether Defoamer SFD-30

Specifications

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