Product Information of DOWSIL AFE-7600 Defoamer
Wide Process Tolerance: Maintains stability in pH 14 environments and 150°C kraft pulping stages.
Concentrated Cost-Efficiency: Contains 54-58% active content and 60-69% solids for economical dilution.
Fast Defoaming Action: Nano-silicone particles collapse bubbles within 20 seconds (per ASTM D892).
Eco-Friendly Compliance: Free of APEO and VOC, meeting GB 18582-2020 standards.
Strong Shear Resistance: Works with ≥50 bar jet cleaning and 1,800 m/min paper machines.
Areas of Application of DOWSIL AFE-7600 Defoamer
Pulp Cooking: Lowers fiber loss in pH 12-14 black liquor digestion processes.
Metal Cleaning: Eliminates microbubbles in pH 12 alkaline degreasers.
Liquid Detergents: 0.25% dosage ensures foam control even after 12 weeks of aging at 40°C.
Effluent Treatment: Reduces sludge by 50% in high-COD wastewater.
Paper Machine: Enhances sheet uniformity in 1,800 m/min forming sections.
Specifications Of DOWSIL AFE-7600 Defoamer
Type | Silicone concentrated defoamer |
Appearance | Milky homogeneous liquid |
Active Content | Polydimethylsiloxane + hydrophobic silica (54-58%) |
Solid Content | 60-69% |
Dynamic Viscosity | 70,000 mPa·s |
pH Range | 1-14 |
Density | 1.0 g/cm³ |
Surface Tension | 21.5 dyn/cm |
Flash Point | >100°C (closed cup) |
Thermal Stability | No stratification (150°C/24h) |
Recommended Dosage | 0.1%-0.5% (by total weight) |
Shelf Life | 12 months (sealed, 5-40°C) |
Packaging | 200kg/drum or custom bulk bags |
DOWSIL AFE-7600 Defoamer – Frequently Asked Questions (FAQ)
Q1: What types of industrial processes is DOWSIL AFE-7600 Defoamer typically used in?
A: DOWSIL AFE-7600 Defoamer is commonly employed in water-based industrial coatings, adhesives, sealants, and construction mortars where persistent foam can interfere with application, film formation, or surface appearance.
Q2: How should DOWSIL AFE-7600 Defoamer be incorporated into a formulation?
A: It is generally added during the let-down or post-addition stage, after high-shear mixing has been completed, to preserve its defoaming efficiency. Pre-dilution with water or a compatible solvent may improve dispersion in sensitive systems.
Q3: Is DOWSIL AFE-7600 Defoamer compatible with silicone-free formulations?
A: Yes — as a non-silicone, hydrophobic polymer-based defoamer, it is specifically designed for use in silicone-free systems where residual silicone contamination must be avoided, such as in certain electronics assembly or high-purity coating applications.
Q4: Does DOWSIL AFE-7600 Defoamer affect gloss or clarity in finished films?
A: When used at recommended dosage levels, it typically does not significantly impair gloss or transparency in clear coatings or sealants, due to its fine particle dispersion and low refractive index mismatch with common aqueous media.
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