Guangzhou Eric Wei Chemical Co., Ltd.
Guangzhou Eric Wei Chemical Co., Ltd.

DOW DOWSIL AFE-7820 Defoamer

DOW DOWSIL AFE-7820 is a high-performance silicone emulsion defoamer designed for the pulp and paper sector. Boasting optimized thermal-mechanical properties, it lowers foam porosity by 40% at 0.005%-0.1% dosage while increasing fiber yield by 15%. Certified by ISO 9001 and REACH, this milky homogeneous liquid (1,000-3,500 mPa·s viscosity) performs stably at pH 1-14 and ≤150°C, enabling rapid bubble collapse in kraft and sulfite pulping processes.

Product Information of DOW DOWSIL AFE-7820 Defoamer

  1. Wide pH Compatibility: Functions effectively from pH 1 acid bleaching to pH 14 black liquor systems.

  2. Fast Defoaming Action: Nano-silicone particles (D50≤5 μm) collapse bubbles within 20 seconds.

  3. Strong Thermal Resistance: Retains over 95% activity after 24 hours at 150°C.

  4. Eco-Friendly Compliance: Free of APEO and VOC, meeting GB 18582-2020 and OECD 301B standards.

  5. Cost-Saving Performance: Reduces defoaming cost per ton of pulp by 18% through optimized dosage.

Areas of Application of DOW DOWSIL AFE-7820 Defoamer

  1. Pulp Digestion: Controls fiber loss in 160-170°C kraft cooking processes.

  2. Paper Machine Whitewater: Improves sheet uniformity in 1,800 m/min forming sections.

  3. Industrial Cleaners: Suppresses foam in pH 12 alkaline degreasers.

  4. Effluent Treatment: Lowers sludge volume in high-COD wastewater (≥30,000 mg/L).

  5. Mineral Oil Enhancement: Boosts the persistence of mineral oil-based defoamers.

Specifications Of DOW DOW DOWSIL AFE-7820 Defoamer

Type
Silicone emulsion defoamer
Appearance
Milky homogeneous liquid
Active Content
Polydimethylsiloxane + hydrophobic silica (18-22%)
Dynamic Viscosity
1,000-3,500 mPa·s
pH Range
1-14
Surface Tension
21.5 dyn/cm
Flash Point
>150°C (closed cup)
Thermal Stability
No stratification (150°C/24h)
Recommended Dosage
0.005%-0.1% (by total weight)
Shelf Life
360 days (sealed, 5-35°C)
Packaging
200kg/IBC tote or 20kg/PE drum


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