PDMS-based silicone antifoams for industrial foam control: neat antifoam compounds and 10-50%-active aqueous emulsions for metalworking fluids, wastewater, pulp/paper, and chemical processing.
Silicone defoamers are polydimethylsiloxane (PDMS) additives that collapse and prevent foam in industrial process fluids. The active is PDMS carried on hydrophobic fumed silica; the silica is what destabilizes the foam film, so the two work as a pair. They ship in two forms: neat antifoam compounds for concentrated or non-aqueous dosing, and aqueous emulsions (typically 10-50% active) for water-based systems. Match the form to the medium rather than buying one grade for every line.
Silicone antifoams are effective at very low dose, often well under 100 ppm, which keeps cost-in-use low even at high silicone prices. The honest trade-off is form against longevity: emulsions disperse instantly into water-based metalworking fluids and effluent but can shear out or deposit silicone over a long sump life, while neat compounds are more persistent and economical but harder to disperse evenly. Specify the emulsion for aqueous metalworking and wastewater; specify the neat compound where silicone carryover or unit cost is the priority.
One caution drives selection more than performance: silicone carryover can cause cratering or fisheyes on any coated or painted surface downstream. Where the treated fluid contacts parts that are later painted, evaluate a non-silicone defoamer or confirm the silicone is fully removed before finishing. Food-contact and wastewater service use dedicated grades; confirm regulatory status for your application and jurisdiction.
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