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 collapsenand prevent foam in industrial process fluids. The active is PDMS carried onnhydrophobic fumed silica; the silica is what destabilizes the foam film, so the two worknas a pair. They ship in two forms: neat antifoam compounds for concentrated or non-aqueousndosing, and aqueous emulsions (typically 10-50% active) for water-based systems. Match thenform to the medium rather than buying one grade for every line.
nnSilicone antifoams are effective at very low dose, often well under 100 ppm, which keepsncost-in-use low even at high silicone prices. The honest trade-off is form againstnlongevity: emulsions disperse instantly into water-based metalworking fluids and effluentnbut can shear out or deposit silicone over a long sump life, while neat compounds are morenpersistent and economical but harder to disperse evenly. Specify the emulsion for aqueousnmetalworking and wastewater; specify the neat compound where silicone carryover or unitncost is the priority.
nnOne caution drives selection more than performance: silicone carryover can causencratering or fisheyes on any coated or painted surface downstream. Where the treated fluidncontacts parts that are later painted, evaluate a non-silicone defoamer or confirm thensilicone is fully removed before finishing. Food-contact and wastewater service usendedicated grades; confirm regulatory status for your application and jurisdiction.
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