Defoamer CAS#: Mixture (Main active: Polydimethylsiloxane, CAS 9006-65-9)
Efficient Defoaming & Foam Suppression: Defoamer can rapidly break formed foam and inhibit new foam generation in aqueous systems at low addition amount. It reduces surface tension locally, destroys foam film strength, and achieves fast defoaming effect without interfering with the original system function.
Wide Medium Compatibility: It maintains stable performance in a wide pH range of 4–12, and is compatible with most water-based systems. It does not react with surfactants, flocculants, scale inhibitors and other common water treatment chemicals.
Versatile Uses: It is widely used in reverse osmosis water treatment, circulating cooling water, sewage treatment, papermaking, textile printing and dyeing, coating, latex, fermentation, food processing and chemical reaction process.
Liquid Form & Low Residue Property: Normally supplied as milky white emulsion or colorless transparent liquid. It is easy to disperse in water, low dosage, good thermal stability, and will not produce sediment or secondary pollution within the recommended dosage range.
Defoamer is a compound formulation, and silicone-based defoamer is the most common grade. Its main active component is polydimethylsiloxane, compounded with emulsifier, thickener and deionized water. It works by spreading on the foam surface and penetrating the foam film to rupture the bubble structure. It can be divided into silicone type, polyether type, polyether modified silicone type according to different active ingredients. Different grades are suitable for high-temperature systems, food contact systems and strong alkaline wastewater scenarios.
| Chemical Properties | Parameter |
|---|---|
| Appearance | Milky white emulsion / colorless transparent liquid |
| Main Components | Polydimethylsiloxane, emulsifier, thickener, water |
| Solubility | Dispersible in water; insoluble in oil phase for certain grades |
| Density | 0.98–1.05 g/cm³ (25℃) |
| pH (1% solution) | 6.0–8.0 |
| Storage temp | Store between 5℃ and 35℃ |
| Stability | Stable under sealed storage; avoid high-speed long-time shearing, freezing and high temperature above 60℃ |
| Viscosity | 50–2000 cP (25℃, varies by grade) |
| Recommended Dosage | 0.5–5 mg/L, adjusted according to foam condition |
| Safety Information | Content |
|---|---|
| Hazard Statement | Low irritation; long-term direct contact may cause mild skin dryness; splashing into eyes leads to irritation |
| Storage | Sealed storage in cool and ventilated place, avoid direct sunlight, freezing and high temperature |
| Handling | Wear protective gloves and goggles. In case of eye contact, rinse thoroughly with plenty of clean water |
| Waste Treatment | Dilute with water before discharge, follow local environmental protection regulations |
| HS Code | 34029000 |
This compound is employed to eliminate and restrain foam in various industrial aqueous systems. Silicone defoamer features outstanding high temperature resistance and chemical inertia. Polyether defoamer has good compatibility and less impact on membrane elements, which is preferred for RO water treatment systems. Special food-grade defoamer meets food contact requirements for beverage and fermentation industry.
