DOWSIL 7305 is a high-efficiency water-based silicone defoamer with 5% active content (polydimethylsiloxane), engineered for harsh industrial environments. It maintains stable defoaming performance in pH 2–12 and temperatures ≤80°C, leveraging nano-scale dispersion technology to achieve rapid bubble collapse (≤15 sec) and long-term suppression (24+ hours). With dynamic surface tension as low as 25.2 mN/m, it boosts process efficiency in wastewater treatment and paper pulping systems. FDA-compliant (21 CFR 176.210), it suits eco-sensitive uses like food processing wastewater, while being compatible with anionic/nonionic surfactants to reduce foam-caused equipment corrosion and energy loss.
Broad-Spectrum Efficiency: Eliminates >95% of micron-level bubbles, especially effective in high-solids systems (e.g., sludge dewatering).
Extreme Condition Adaptability: Active in strong acid/alkali (pH 2–12) and high-salinity wastewater; resists transient thermal shock (≤80°C).
Low-Dosage Persistency: Recommended 50–200 ppm usage cuts operational costs by reducing frequent replenishment.
Eco-Compliance: APEO-free, VOC <50 g/L; certified under EU REACH and China GB 24408.
Wastewater Treatment: Suppresses biological foam in activated sludge and MBR systems to improve aeration efficiency.
Paper Industry: Reduces flotation and deposits in pulp bleaching, enhancing sheet smoothness.
Food Processing: Controls foam in fermenters and cleaning lines, meeting indirect food contact standards.
Chemical Production: Prevents bubble defects in water-based coatings/adhesives production.
Type | Polyether-modified silicone defoamer |
Appearance | Milky liquid |
Active Content | 57% |
Viscosity (25°C) | 2000 mPa·s |
Dynamic Surface Tension | 25.2 dyn/cm (0.5% solution) |
pH Value | 7.4 |
Flash Point | ＞101℃ |
Recommended Dosage | 0.05%-0.5% (on total formulation) |
Packaging | 25kg/drum or 200kg/IBC |
Q1: What types of formulations is Dowsil 7305 Defoamer typically used in?
A: Dowsil 7305 Defoamer is commonly incorporated into water-based industrial coatings, architectural paints, adhesives, sealants, and construction mortars where persistent foam control is required during manufacturing, application, or storage.
Q2: How should Dowsil 7305 Defoamer be added to a formulation?
A: It is generally recommended to add Dowsil 7305 Defoamer during the let-down or post-addition stage, after high-shear mixing has been completed. Pre-dilution with water or a compatible solvent may improve dispersion, especially in low-solids systems.
Q3: Is Dowsil 7305 Defoamer compatible with common surfactants and thickeners?
A: Yes, Dowsil 7305 Defoamer demonstrates good compatibility with anionic, nonionic, and associative thickeners (e.g., HEC, HASE, ASE), as well as widely used surfactants in aqueous systems—though compatibility testing under actual formulation conditions is always advised.
Q4: Does Dowsil 7305 Defoamer affect gloss or film appearance in finished coatings?
A: When used at recommended dosage levels, Dowsil 7305 Defoamer typically does not negatively impact gloss retention, clarity, or film integrity in most architectural and industrial coating applications.
Q5: What is the shelf life of Dowsil 7305 Defoamer, and how should it be stored?
A: When stored unopened in its original container at temperatures between 5 °C and 30 °C, away from direct sunlight and freezing conditions, Dowsil 7305 Defoamer maintains stability for up to 12 months from the date of manufacture.
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