Product Information of DOW DOWSIL 9902 Defoamer
Harsh Environment Resistance: Maintains stability in H2S-containing sour oil wells and 150°C thermal recovery systems.
Quick Foam Collapse: Nano-silicone particles break foam in 15 seconds (meets ASTM D892 standards).
Wide Compatibility: Avoids phase separation in brine and hydrocarbon mixed systems.
Eco-Friendly Traits: APEO/VOC-free, with a biodegradability rate of ≥90%.
Cost Savings: Cuts per-ton crude oil treatment cost by 18%.
Areas of Application of DOW DOWSIL 9902 Defoamer
Oil Drilling: Manages gas-cut foam in pH 8-12 drilling muds.
Refining Process: Eliminates coking foam in 450-500°C delayed cokers.
Gas-Liquid Separation: Reduces microfoam in three-phase separators.
Produced Water Handling: Defoams high-TDS wastewater (≥50,000 ppm).
Chemical Coordination: Improves lubrication and corrosion inhibition in pipelines.
Specifications Of DOW DOWSIL 9902 Defoamer
ype | Siloxane-based defoamer |
Appearance | Colorless to pale amber liquid |
Active Content | Polydimethylsiloxane + hydrophobic silica (100%) |
Dynamic Viscosity | 1,000-5,000 mPa·s |
pH Range | 1-14 |
Flash Point | >150°C (closed cup) |
Surface Tension | 22.5 dyn/cm |
Density | 0.96-1.02 g/cm³ |
Thermal Stability | No stratification (150°C/24h) |
Recommended Dosage | 0.1%-0.5% (by total weight) |
Shelf Life | 24 months (sealed, 5-40°C) |
Packaging | 200kg/galvanized drum or bulk bags |
DOW DOWSIL 9902 Defoamer – Frequently Asked Questions (FAQ)
Q1: What types of industrial processes is DOWSIL 9902 Defoamer typically used in?
A: DOWSIL 9902 Defoamer is commonly employed in water-based coatings, adhesives, sealants, and construction chemicals where persistent foam can interfere with application, film formation, or surface appearance. It is especially valued in high-shear mixing and spray-application environments.
Q2: How does DOWSIL 9902 differ from conventional silicone-based defoamers?
A: DOWSIL 9902 is a specially formulated polydimethylsiloxane (PDMS)-based emulsion designed for enhanced compatibility and reduced risk of surface defects—such as craters or haze—in sensitive formulations. Its balanced hydrophobicity/hydrophilicity profile supports rapid knock-down and lasting foam control without compromising clarity or substrate wetting.
Q3: Is DOWSIL 9902 suitable for use in low-VOC or high-solids systems?
A: Yes—DOWSIL 9902 is an aqueous emulsion containing no solvents or VOCs, making it compatible with low-VOC, zero-VOC, and high-solids formulations. Its performance remains effective even when co-formulated with common rheology modifiers and dispersants.
Q4: What is the recommended addition method for optimal performance?
A: For best results, DOWSIL 9902 should be added during the let-down or post-addition stage, after high-shear dispersion of pigments and fillers. Pre-dilution with water or a compatible solvent may improve uniform distribution, particularly in viscous systems.
Q5: Does DOWSIL 9902 require stabilization or pH adjustment before use?
A: DOWSIL 9902 is supplied as a stable, ready-to-use emulsion and generally performs well across a broad pH range (approximately 4–10). While no pre-treatment is required, compatibility testing is advised when incorporating into highly acidic, alkaline, or electrolyte-rich systems to confirm long-term stability.
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