Specialty Formulation CAS 63148-62-9

Silicone Defoamer Emulsion

ZEELCHEM™ DF

High-efficiency polydimethylsiloxane (PDMS) non-ionic aqueous emulsion engineered for instant foam knockdown (<3 sec) and prolonged antifoaming persistence across extreme pH (1 to 13) and temperatures up to 130°C.

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Technical Specification Target

Active Matter:10% / 20% / 30% Active PDMS
Emulsion Type:Non-ionic aqueous dispersion
pH (Neat @ 25°C):6.5 – 8.0
Specific Gravity:0.98 – 1.02 g/cm³
Centrifuge Stability:No phase separation (3000 rpm)
Knockdown Time:< 3 seconds
Standard Packaging:50kg Carboys, 200kg HDPE Drums

Defoaming Kinetics & Film Rupture Mechanism

PDMS silicone droplets possess extremely low surface tension (~21 mN/m), lower than surfactant-stabilized aqueous foam lamellae. Upon contact, the defoamer particle enters the air-water interface, spreads rapidly, and locally thins the liquid film until spontaneous collapse occurs.

Engineered with hydrophobic silica activators, ZEELCHEM™ DF provides long-lasting foam suppression in biological wastewater aeration tanks, textile jet dyeing machines, and chemical manufacturing.

Standard Industrial Dosage

ApplicationRecommended Dosing
ETP & STP Aeration Basins10.0 – 50.0 ppm
Textile Scouring & Jet Dyeing0.2 – 1.0 g/L
Pulp & Paper Black Liquor50 – 200 g/ton pulp
Chemical Synthesis & Distillation20 – 100 ppm

Packaging, Handling & Storage

  • Packaging Options: 50 kg carboys, 200 kg virgin HDPE drums, and 1,000 kg IBC totes.
  • Storage Conditions: Store between 5°C and 35°C in a dry area. Protect from freezing and excessive heat.
  • Shelf Life: 12 months in unopened factory containers.
  • Handling Safety: Non-hazardous emulsion. Standard PPE (safety glasses, gloves) recommended.
Non-Spotting Formula: Emulsified to sub-micron particle sizes to guarantee zero oil spotting on textile fabrics or paper surfaces.
Technical Knowledgebase

Frequently Asked Questions: Silicone Defoamer Emulsion

Expert technical answers on dosing, chemistry, handling, and application performance.

Q1. What is Silicone Defoamer Emulsion and how does it knock down foam?

Silicone Defoamer (CAS 63148-62-9) is a non-ionic polydimethylsiloxane (PDMS) emulsion that rapidly spreads across foam bubble lamellae, destabilizing surface tension and collapsing foam in under 3 seconds.

Q2. What is the recommended dosing of Silicone Defoamer in ETP/STP aeration tanks?

Standard dosing is 10.0 to 50.0 ppm active, applied via continuous drip or spray directly over the aeration foam layer.

Q3. Across what pH and temperature range is ZEELCHEM™ DF effective?

ZEELCHEM™ DF operates across pH 1.0 to 13.0 and temperatures up to 130°C in pressurized textile jet dye machines and industrial distillation columns.