Section
| HS Code | 966842 |
| Product Name | SILFOAM SE 1260 High-Temperature Silicone Antifoam Emulsion |
| Product Type | Silicone antifoam emulsion |
| Chemical Composition | Polydimethylsiloxane and treated silica dispersed in water with emulsifiers |
| Active Silicone Content | Approximately 10% |
| Appearance | Milky white liquid |
| Odor | Odorless to slightly characteristic |
| Emulsion Type | Oil-in-water |
| Density At 25c | Approximately 1.00 g/cm³ |
| Viscosity At 25c | Low viscosity, approximately 100 mPa·s |
| Ph Value | Neutral to slightly alkaline (approximately 7–8) |
| Dispersibility | Readily dispersible in water |
| Maximum Service Temperature | 130°C |
| Shelf Life | At least 12 months when stored at 5–35°C in sealed original containers |
| Frost Sensitivity | Protect from frost |
As an accredited SILFOAM SE 1260 High-Temperature Silicone Antifoam Emulsion (130°C) factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SILFOAM SE 1260 High-Temperature Silicone Antifoam Emulsion is supplied in 25 kg pails and 200 kg drums. |
| Container Loading (20′ FCL) | 20′ FCL: loaded on shrink-wrapped pallets, secured with bracing, avoiding moisture/heat sources for safe transport of SILFOAM SE 1260. |
| Shipping | SILFOAM SE 1260 is shipped as a non-hazardous aqueous silicone emulsion in sealed containers (drums, pails, or totes). Protect from freezing and extreme heat; store between 5–35°C. Ensure containers are upright, secured, and labeled. Avoid prolonged exposure to direct sunlight. Transport via standard freight; no special dangerous goods classification required. |
| Storage | Store SILFOAM SE 1260 in its original, tightly closed container in a cool, dry, well-ventilated area away from direct sunlight, strong oxidizers, and incompatible materials. Avoid freezing and excessive heat; recommended storage temperature is typically between 5°C and 40°C. Keep containers sealed when not in use to prevent contamination, drying, or separation. |
| Shelf Life | SILFOAM SE 1260 shelf life is 12 months from date of manufacture if stored unopened at 5-30°C, protected from freezing. |
High-temperature overflow jet and beam machines generate foam mechanically at the venturi because air is entrained when the fabric transport liquor passes from nozzle back pressure into atmospheric return. In polyester disperse dyeing, the bath contains spin finish residues, oligomer, dispersing agents, and disperse dye carriers. During the heating ramp from 110 °C to 130 °C, the foam volume can exceed the freeboard of the overflow tank, leading to pump cavitation, loss of circulation pressure, and fabric rope tangling. A high-temperature silicone antifoam emulsion with a stated thermal ceiling of 130 °C is added at 0.01–0.2 g/L of bath mass after pre-dilution with demineralized water at 25–40 °C. The addition point is typically the overflow weir or side tank rather than the suction side of the main circulation pump, because the venturi imposes shear rates above 104 s-1 that can split coarse emulsion droplets and reduce foam collapse efficiency during the isothermal hold.
In disperse dyeing, foam collapse efficiency is screened before bulk production with a foam cell test modelled on ASTM E2407-04, using 0.5 wt% sodium dodecylbenzenesulfonate in deionized water at 130 °C. Because the standard does not define a universal pass limit, the dyehouse sets the acceptance threshold according to machine freeboard and pump suction pressure; the measured variable is foam volume reduction after antifoam addition. Dosing above 0.3 g/L may leave hydrophobic silicone oil droplets on yarn or fabric, which can interfere with reduction clearing and produce staining or reduced wet rub fastness. After the trial, wet rub fastness is checked under ISO 105-X12. If the fabric is a polyester/elastane blend, the bath may also contain silicone-based softeners and lubricants that compete with the antifoam emulsion; the effective dose is raised only after foam cell screening because the additional silicone load can alter seam slippage in lightweight knits. In dye baths containing high levels of cationic leveling agents or cationic softeners, the emulsion charge can be incompatible, and jar tests must be run with the complete chemical system because silicone droplet adsorption onto cationic polymers can form greasy deposits.
The process boundary for this application is the upper thermal stability limit of 130 °C. Repeated autoclaving above this temperature or direct live steam injection can cause oil separation and deposition on machine walls. In partially flooded jet machines with back pressure below 1.0 bar, the bath may vaporize at 130 °C unless pump suction pressure is maintained. The emulsion should be added during the early heating ramp, below 80 °C, to allow homogeneous distribution before the critical foam window between 110 °C and 130 °C. If a reduction clearing step is performed at 80–90 °C, residual foam control agent can be removed with excess rinsing; carryover into subsequent pale shades is measured by wicking time under AATCC TM79 and by foam collapse checks in the next bath preparation.
In kraft pulp mills, brown stock washing removes dissolved lignin and spent cooking chemicals from cooked wood chips at 70–90 °C. The weak black liquor phase contains tall oil soaps, resin acids, and surfactant fragments that stabilize foam in filtrate tanks and on the vacuum drum deck. Uncontrolled foam on a brown stock drum washer reduces vacuum formation, causes uneven mat thickness, and increases soda loss because foam carries black liquor into the shower water rather than into the filtrate. A high-temperature silicone antifoam emulsion is dosed into the washer vat or filtrate tank at 0.05–0.3 kg/t oven-dry pulp. The addition point is selected to allow mixing without passing through the main stock transfer pump, which can apply high shear and reduce the large emulsion droplets to submicron sizes that are less effective in film rupture.
Black liquor pH is typically 12–13 in kraft pulping, so the emulsion must resist alkaline hydrolysis and maintain a discrete oil phase when diluted in washer shower water. A jar test with filtered weak black liquor at 80 °C is used to compare foam collapse and re-foam time; the test liquid is circulated through a peristaltic pump at low speed to mimic the vacuum pump seal water return. Published field data for this specific product in tall oil soap foam systems is limited; plant trials are therefore run across the range of 0.05–0.3 kg/t and the final set point is fixed by differential pressure across the drum. Overdose above 0.5 kg/t can create hydrophobic pulp surfaces, lower intra-fiber bonding, and carry silicone into the bleach plant. In elemental chlorine-free bleaching, deposits on twin-roll press rolls and drum filter screens are monitored by solvent extraction; silicone content in process water is quantified by inductively coupled plasma optical emission spectrometry after filtration. Sheet drainage after defoamer addition is checked with the Schopper-Riegler method under ISO 5267-1:1999 to ensure that carried silicone does not reduce freeness below the bleachery target.
The foam break effect is read through washer shower penetration and sheet moisture, not solely through bottle shaking. If defoamer dosage is reduced below 0.05 kg/t, air entrainment in the filtrate can change wash liquor flow distribution and reduce mat dewatering. In a rotary vacuum drum washer, the control range is typically 20–40 kPa differential pressure, measured by diaphragm pressure transmitters on the vacuum line. For paper machine trials, 24–48 h observation windows are used with shower water flow fixed and the defoamer feed kept constant; changes in shower flow, drum speed, or black liquor solids would otherwise invalidate the comparison.
| Application | Liquid temperature | Dosage range | Addition point / equipment | Primary failure mode above recommended dose |
|---|---|---|---|---|
| Polyester HT jet dyeing | 110–130 °C | 0.01–0.2 g/L bath | Overflow trough or side tank, pre-diluted | Silicone spotting, reduced wet rub fastness |
| Kraft brown stock washing | 70–90 °C | 0.05–0.3 kg/t oven-dry pulp | Washer vat or filtrate tank | Hydrophobic pulp, bleach plant carryover |
| Aerobic activated sludge | 15–40 °C | 1–10 mg/L influent | RAS channel or mixed liquor channel | Membrane fouling in MBR; kLa reduction |
| Industrial CIP recirculation | 80–90 °C | 10–100 mg/kg wash solution | Return line or recirculation tank | Hydrophobic film on stainless steel |
| Latex monomer stripping | 80–100 °C | 50–300 mg/kg wet latex | Stripping column feed | Film haze, reduced surface energy |
| Cooling water return basin | 35–50 °C | 2–10 mg/L blowdown | Return water line upstream of deck | Side-stream filter fouling |
Silicone antifoam dosing in aerobic activated sludge basins is normally set between 1 mg/L and 10 mg/L of influent flow when foam physically obstructs level probes or overflows the basin walls. The emulsion is injected into the return activated sludge channel or the mixed liquor channel rather than directly into the aeration tank, because the fine-bubble diffuser field provides enough shear and residence time to develop the antifoam film before the surface foam zone. An initial dose of 2–5 mg/L is held for 24 h, and the foam height is recorded against clarifier weir level. If the foam is caused by filamentous bacteria, the antifoam only reduces surface tension and does not address the biological cause; parallel microscopic examination of the mixed liquor and a 30 min settling test in a 1 L cylinder are used to separate biological foaming from surfactant foaming.
In membrane bioreactor configurations, silicone antifoam dosing above 3 mg/L has been associated with cake layer fouling because the emulsion droplets can coalesce on hydrophobic PVDF or PES membrane surfaces. Before continuous dosing, a filterability test is conducted by measuring the time required to filter 250 mL of mixed liquor through a 0.45 µm membrane filter under 0.5 bar vacuum. An increase of more than 20% in filtration time after 24 h indicates the need to reduce the dose or switch to a non-silicone chemistry. Respiration inhibition is evaluated according to ISO 8192:2007 at 100 mg/L of the antifoam product to confirm that the silicone emulsion does not suppress nitrifying biomass oxygen uptake. The product is not a biocide and does not remove fats, oils, or greases; it is limited to lamella destabilization in the foam phase. The treated end product is clarified effluent, and the relevant discharge limits for suspended solids, surfactants, and dissolved oxygen are governed by the site-specific permit, not by the defoamer composition.
In dairy and brewery cleaning circuits, a caustic wash at 1–2 wt% sodium hydroxide and 80–90 °C emulsifies protein and fat residues, producing foam that can block spray ball rotation and reduce mechanical action on stainless steel surfaces. A silicone antifoam emulsion with a 130 °C upper stability limit is dosed at 10–100 mg/kg of the circulating wash solution when foam height in the recovery tank exceeds 50% of the tank freeboard. The addition point is the return line or the recirculation tank, where a low-shear centrifugal pump can disperse the emulsion without breaking the silicone droplets. Because the wash solution is not a direct food-contact stream after the final rinse, the main regulatory check is often surface residue removal; any defoamer left on stainless steel can be detected by a water break-free test after the rinse. Overdose above 150 mg/kg can create a hydrophobic film that reduces the apparent cleanliness of metal surfaces and interferes with subsequent acid passivation. Formulations intended for use in food-processing facilities are reviewed under 21 CFR 173.340 only when the defoamer is used in the manufacture of paper and paperboard; otherwise, product-specific food-contact clearances and final rinse validation apply. The silicone emulsion is not compatible with strong oxidizing CIP stages containing more than 5 wt% available chlorine at 70 °C because the oil phase may crosslink and form deposits on gasket materials.
Residual monomer stripping in vinyl acetate-ethylene and acrylic latex manufacturing is carried out at 80–100 °C under vacuum, where anionic surfactants and polymer fines create a stable foam that carries latex into the condenser and vacuum pump. A high-temperature silicone antifoam emulsion is metered into the stripping column feed at 50–300 mg/kg wet latex, after the polymerization phase is complete. If it is added during polymerization, the silicone droplets can interfere with particle nucleation and destabilize the emulsion. The metering pump must be a low-shear progressive cavity unit with a flow rate not exceeding 10% of the column feed line velocity, because centrifugal or gear pumps can split the silicone droplets below 5 µm and shorten the foam-control lifetime before re-foaming occurs. The primary process variable is condensate turbidity: an increase after defoamer dosing indicates latex carryover and insufficient foam knockdown. Overdose above 500 mg/kg increases the concentration of silicone oil in the dried film, which can raise the coefficient of friction and reduce surface energy; the effect is quantified by water contact angle measurement under ASTM D5946 and by a tape adhesion pull-off test on the coalesced film. In high-gloss clear coatings, even 100 mg/kg of silicone oil can be visible as haze, so the product is evaluated in a 50 µm drawdown film under ISO 2813 gloss measurement before full-scale use.
In open recirculating cooling water systems where plant washdown carries glycol or detergents into the return basin, foam can obstruct water level sensors at temperatures of 35–50 °C. Silicone antifoam at 2–10 mg/L of blowdown is injected into the return water line upstream of the distribution deck. The main limitation is downstream membrane filtration: silicone oil droplets above 5 µm can foul side-stream filters and reverse osmosis pre-filters. A filterability check using a 0.45 µm membrane at 0.5 bar differential pressure is used to set the maximum allowable dose. This application does not exploit the 130 °C threshold; it is included because the same emulsion must remain intact through high-shear pump impellers and warm return water, and because a product designed for hot process streams often shows better storage stability than ambient-only antifoams. The final output is clean blowdown water within site-specific oil and grease limits measured by ISO 9377-2 or the equivalent permit method; the defoamer does not remove the glycol or detergent load itself.
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SILFOAM® SE 1260 High-Temperature Silicone Antifoam Emulsion is a nonionic, water-dilutable polydimethylsiloxane dispersion supplied for foam suppression in aqueous process systems operating up to 130°C. The manufacturer specifies the material as a white, pourable emulsion with approximately 20% active silicone content, pH 6–8, and density near 1.0 g/cm³ at 20°C. Primary application is in high-temperature textile wet processing—polyester and polyester-cellulosic substrates dyed in jet, package, and beam equipment—where entrained air derived from residual spin finishes, coning oils, oligomer dispersions, and dispersing agents reduces pump efficiency, destabilizes fabric rope movement, and creates unlevel dye uptake. The product is prediluted with cold process water at 1:5 to 1:10 before injection to prevent emulsion shock from thermal or electrolyte gradients. Unlike general-purpose silicone emulsions formulated for ambient-service foam control, the 130°C grade is selected when the foam-control agent must survive pressurized steam dyeing cycles and repeated passage through high-shear circulation pumps without depositing hydrophobic residues on yarn packages or machine surfaces.
As an aqueous emulsion, the product consists of a polydimethylsiloxane oil phase dispersed in water and stabilized by a nonionic emulsifier system. The near-neutral pH and water-thin consistency permit metering with standard low-shear diaphragm or peristaltic pumps. Because the continuous phase is water, the product should not be mixed with hydrocarbon solvents or strong acids; phase inversion may occur and destroy the antifoam effect. The density close to 1.0 g/cm³ minimizes creaming in storage compared with lower-density mineral oil defoamers, but gentle recirculation or drum rolling before use is still recommended for bulk storage tanks where long residence times occur.
| Parameter | Value | Reference method or basis |
|---|---|---|
| Appearance | White, pourable aqueous emulsion | Visual inspection |
| Active silicone content | Approximately 20% | Nonvolatile silicone solids |
| pH as supplied | 6–8 | DIN EN ISO 10523 |
| Density at 20°C | Approximately 1.0 g/cm³ | ISO 2811-1 |
| Ionic character | Nonionic | Manufacturer data |
| Thermal service limit | 130°C in closed pressurized equipment | Supplier performance specification |
| Dilution before use | 1:5 to 1:10 with cold water | Manufacturer recommendation |
During high-temperature jet dyeing cycles, the circulation pump and Venturi nozzle impose shear rates that continuously break up silicone droplets and entrain air into the dyebath. In jet machines operating with liquor ratios between 1:5 and 1:10, foam inside a closed pressure vessel does not follow the same drainage and collapse behavior observed in open atmospheric pilot tests; the elevated pressure compresses bubbles, increases gas-liquid interfacial area, and may stabilize lamellae through dissolved surfactants and polyester oligomers. SILFOAM SE 1260 is introduced into the preparation tank or the suction side of the main circulation pump after being diluted with cold water. The silicone phase migrates to the air-water interface and destabilizes foam films by a bridging-dewetting mechanism: the oil droplet enters both surfaces of the film, forms a bridge, and dewets the aqueous phase, causing local film thinning and rupture. In production-scale high-temperature jet machines, foam-related failure is most often observed as fluctuating pump discharge head, periodic rope standstill at the nozzle exit, filter pressure rise, and shade variation between sections of the same lot. The effective dose is therefore established through a foam-height test such as ASTM E2407 using actual process liquor, followed by closed-equipment validation because the atmospheric test cannot reproduce pressure-dependent bubble size or drainage rates at 130°C.
Laboratory screening should use a jacketed column with a sintered-glass sparger and controlled air flow. The test liquor should contain the same dispersing agent, lubricant, and electrolyte loading as the production bath. A screening temperature of 80–90°C is often used for atmospheric evaluation because it approaches the practical limit before boiling; however, final dose confirmation at 130°C requires a pressure-rated vessel with a back-pressure regulator, mechanical stirrer, and sight glass. The atmospheric test can underpredict foam formation in closed jet equipment because gas solubility and bubble-size distribution change with pressure, and because the shear-induced droplet refinement in the circulation loop is absent. Published data for this specific emulsion under pressure-jet dyeing shear is limited; therefore, dose-response trials on the target machine are required before a production formulation change.
The relationship between silicone droplet size and foam film thickness is central to dose optimization. In thick foam films generated by low-liquor-ratio jet dyeing, larger droplets may spread on the upper film surface but not bridge; in thin foam lamellae generated after high-shear recirculation, the same droplets can bridge and dewet. A single static dose can therefore appear effective in a stirred tank but fail in the dynamic foam bed of a pressure jet machine. Dose should be re-evaluated whenever the liquor ratio, fabric speed, or dispersing agent type changes, rather than held constant across all production styles.
Package dyeing autoclaves with reversible liquor flow are particularly sensitive to foam accumulation at the autoclave head and around the yarn column, because foam displaces dye liquor from upper yarn layers and produces core-to-edge dye uptake differences. The emulsion is metered into the injection side of the circulation loop at an initial concentration in the range of 0.05 g/L to 0.3 g/L, adjusted after a jar test in the actual dyebath. Demand is not constant between yarn lots; package density, yarn denier, spin finish add-on, and dye-dispersing agent loading all change the foam-generating surface. At the 130°C plateau, phase separation or localized creaming can deposit silicone on the yarn surface. Where deposition is suspected, reduction clearing with sodium hydrosulfite and caustic soda at 80–90°C removes superficially adsorbed residues, but the preferred control is to remain within the supplier’s dosage limit and to meter the diluted emulsion through a low-shear progressive cavity or diaphragm pump rather than through a high-speed centrifugal unit that may destabilize the feed stream before it reaches the main bath.
The thermal stability of the emulsion is based on the insolubility of the polydimethylsiloxane active phase and on the nonionic emulsifier architecture, which does not undergo the cloud-point phase separation observed with many alcohol ethoxylate or EO/PO block copolymer defoamers. Steric repulsion between droplets prevents coalescence in the pressurized circuit; increasing temperature increases the collision frequency, but the nonionic headgroups retain sufficient hydration because the water continuous phase remains liquid under autogenous pressure. Mechanical shear from the circulation pump and Venturi nozzle reduces median droplet diameter and increases oil–water interfacial area. Foam control is retained as long as the droplet population remains above the critical film-entry size. If the droplets are sheared below that size, they may become inactive or be scavenged by surfactant micelles. The spreading coefficient S = γaqueous film − γsilicone − γinterfacial must remain positive for the silicone to spread at the lamella surface. Polydimethylsiloxane surface tension is commonly reported near 20–21 mN/m, while surfactant-laden aqueous dyebaths may exhibit surface tensions of 35–45 mN/m, creating a measurable surface tension gradient. Published data for the exact droplet-size distribution of this specific emulsion are limited; therefore, site-specific validation under actual shear and temperature is required before a production formula change.
At atmospheric pressure above 95°C, open boiling baths evaporate water and concentrate the continuous phase, which can destabilize the emulsion and reduce foam-control activity unless continuous replenishment is used. The product is not recommended for unprotected use in strong oxidizing baths such as concentrated hydrogen peroxide or hypochlorite bleaching systems, because oxidative attack on the silicone and emulsifier can reduce foam-control activity and may generate surface residues. Compatibility with high-electrolyte dyeing recipes must be checked by jar test; the nonionic character provides tolerance to many anionic and nonionic auxiliaries, but does not guarantee stability in all reactive dye formulations containing high salt concentrations at the lower liquor ratios used in modern jet machines.
Oxidative or reductive auxiliary interactions are machine-specific. Sodium hydrosulfite used in reduction clearing can alter the ionic strength of the cooling bath; the emulsion remains dispersed in most cases, but stability should be confirmed in the simultaneous presence of high alkalinity and residual metal oxide particles from catalyst or fiber production, because suspended solids can act as additional foam nuclei and increase antifoam demand.
Mineral oil defoamers are commonly used in low-temperature cleaning and open-width preparation ranges, but at 130°C their carrier phase can separate and deposit hydrophobic residues on polyester or nylon. Polyether defoamers based on EO/PO block copolymers rely on inverse solubility; their activity may decline when the process temperature exceeds the cloud point or when the polymer partially solubilizes into the foaming liquor. SILFOAM SE 1260 differs by maintaining an insoluble silicone phase across the textile processing window, so foam control does not depend on a cloud-point transition. The active content of approximately 20% is higher than many conventional silicone emulsions, which allows lower volumetric addition for the same dry silicone dose. The product is not, however, a universal replacement: in ambient open flotation cells or municipal wastewater basins where rapid knockdown is required from a thin layer of pre-existing foam, a mineral oil or organic antifoam may still be preferred because of storage cost and cold-water dispersibility. Selection is based on process temperature and shear history, not only on foam volume in a static test.
| Operating characteristic | SILFOAM® SE 1260 | Mineral oil defoamer | EO/PO block copolymer |
|---|---|---|---|
| Service limit in high-temperature textile equipment | 130°C closed pressurized equipment | Generally below 100°C; phase separation possible | Cloud point limited; may lose activity above 60–85°C |
| Primary foam-control mechanism | Insoluble silicone droplet spreading and bridging-dewetting | Oil film spreading with hydrophobic solids | Inverse solubility and interfacial saturation |
| Active concentration | Approximately 20% silicone | Variable, generally 10–30% carrier oil | Variable, generally 10–40% organic polymer |
| Deposition risk on polyester at 130°C | Low at recommended dosage; rises with overdosing | High if unstably emulsified or overused | Moderate; depends on cloud point and add-on |
| Shear stability under jet pump recirculation | Stable under repeated high-shear passage | Decreases with shear-induced carrier oil loss | Variable; mechanical foam generation may reduce activity |
For continuous preparatory lines operating below 100°C—desizing, scouring, and bleaching ranges—the emulsion can be dosed into the rinse or saturator bath when foam control must be achieved without transferring carrier oil to rollers. Dosing should be made through a low-shear metering pump into a well-mixed zone, and never into a hot bath without prior cold-water dilution. The material is stored between 5°C and 35°C; freezing causes irreversible creaming. Shelf-life data from the manufacturer should be verified from the current safety data sheet. For treated textiles intended for food-contact, medical, or cosmetic service, downstream suitability must be confirmed under the applicable national legislation and EU food-contact material regulations, not inferred solely from the antifoam’s technical data sheet. The manufacturer’s REACH Article 31 safety data sheet should be consulted before use in multiphase reaction mixtures, because emulsifier interactions with other process auxiliaries can alter partitioning and lead to localized foam instability.
