Section
| HS Code | 746080 |
| Product Name | Tech-3488 General Polyether-Modified Silicone Defoamer (Tego-1488 Alternative) |
| Product Type | Polyether-modified silicone defoamer |
| Appearance | Light yellow transparent viscous liquid |
| Active Content Percent | 100 |
| Viscosity At 25 C Mpa S | 1000-2000 |
| Density At 25 C G Cm3 | 1.00-1.05 |
| Ph Value In 1 Percent Water Dispersion | 6.0-8.0 |
| Water Solubility | Dispersible in water |
| Foam Suppression Performance | Excellent long-term foam suppression |
| Surface Tension Characteristic | Low surface tension for rapid defoaming |
| Compatibility | Compatible with nonionic, anionic, and cationic surfactant systems |
As an accredited Tech-3488 General Polyether-Modified Silicone Defoamer–Tego-1488 Alternative factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Tech-3488 defoamer is supplied in sealed 25 kg pails and 200 kg drums, with tamper-evident lids and clear labels. |
| Container Loading (20′ FCL) | One 20′ FCL loaded with drums of Tech-3488 polyether-modified silicone defoamer, securely stowed, avoiding incompatible cargo and excessive heat. |
| Shipping | Tech-3488 ships in sealed drums (25kg/200kg) or IBC totes. Classified as non-hazardous/non-dangerous goods for road, sea, and air freight. Keep containers upright, protected from moisture, extreme heat, or freezing. Use standard dry van or container transport; no special hazmat documentation required. |
| Storage | Store in tightly sealed original containers in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Maintain temperatures between 5°C and 35°C; avoid freezing. Keep away from oxidizing agents and incompatible materials. Ensure containers remain upright and protected from physical damage. Stir before use if separation occurs. Shelf life typically 12 months under recommended conditions. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored in original containers at recommended temperatures. |
The principal foam-defect mechanism in aqueous interior trade-sales formulations with a pigment volume concentration of 55–65% is not macrofoam at letdown but microfoam generated during high-speed mill base dispersion and subsequent airless spray application. Tech-3488, a polyether-modified polydimethylsiloxane defoamer, is incorporated through a split-addition protocol to control both high-shear air entrainment in the grind and low-shear macrofoam in letdown without introducing visible fisheyes. In a typical factory batch, the mill base is prepared on a high-speed disperser fitted with a 350 mm Cowles blade operated at a tip speed of 12–18 m/s. Between 30% and 40% of the total defoamer dose is charged into the grind before titanium dioxide and coarse extender are dispersed at 35–40°C; the remaining 60–70% is added during letdown under reduced agitation at 5–8 m/s tip speed, after coalescent and alkali-swellable rheology modifier incorporation. Total dosage is held at 0.15–0.35 wt% of the complete formulation. The batch is evaluated on a production-scale airless spray unit at 110–140 bar fluid pressure using a 0.017–0.021 in reversible tip; films are applied to black Leneta panels and inspected for pinholes, craters, and gloss loss under ISO 2813:2014. Because the product is a nonionic polyether-modified siloxane, incompatibility at overdosage usually appears as surface oil separation in the wet film rather than as tint-acceptance loss, but tinted formulas with 2–6 vol% point-of-sale colorant must still be checked before full-scale release.
VOC compliance is preserved because the defoamer is used at <1.0 wt%, and its contribution to total volatile organic compound is below the reporting threshold for waterborne interior matt paints regulated under EU 2004/42/EC Phase A, where the limit is 30 g/L. Finished paint is tested according to ISO 11998:2006 for wet scrub resistance after 28 days of cure; the formulation is judged acceptable only when the defoamer does not create pinholes that degrade scrub resistance by more than 10% relative to the control. Viscosity is adjusted to 95–105 KU at 25°C on a Stormer viscometer, and pH is held at 8.2–8.8 with 2-amino-2-methyl-1-propanol. Plant trials use a dose ladder of 0.1%, 0.2%, and 0.3% before full production because published data for the exact gloss shift versus dose curve in a specific tint base are limited. The maximum permissible dose in batch records is set at 0.45 wt%; above this level, deep-base formulations can show visible 60° sheen loss and mottling on tinting lines.
On a central-impression flexographic press running at 150–250 m/min, air is drawn into the chambered doctor blade cavity and dispersed as microfoam by the shearing of waterborne polyurethane-acrylic ink at the anilox surface. The resulting pinholes are visible on 30–40 μm corona-treated low-density polyethylene after drying. Tech-3488 is added as a final post-adjustment additive at 0.05–0.20 wt% of ink weight, after viscosity has been reduced with a water/ethanol blend to 18–25 s in a 4 mm ISO flow cup. The defoamer should not be pre-dispersed under high shear because emulsification to a droplet size below 10 μm reduces defoaming effectiveness. Ink pH is maintained at 8.5–9.5 with a tertiary amine, and contact time between the defoamer and amine at pH above 9.5 is minimized to avoid hydrolytic degradation of the polyether chain. Adhesion of the printed film is tested according to ASTM D3359-17 on low-density polyethylene with a surface tension not lower than 38 mN/m after corona treatment.
Regulatory compliance for printed flexible packaging is managed under EU Regulation 10/2011 for plastic food-contact materials when the print is placed on the non-food-contact side, with migration testing under EU 2020/1245; the defoamer is included in the ink formulation and considered in overall migration where direct food contact is not intended. Pinhole density is measured by optical microscopy on 10 × 10 cm samples and typically specified at fewer than 3 pinholes per 100 cm². Over-addition above 0.30 wt% reduces rewetting of the overprint varnish and can cause crawling of the lamination adhesive. In production, Tech-3488 is added to the press ink sump as a predilution in 5–10 parts of water under slow propeller mixing at 200–300 rpm; this avoids shock droplets and maintains uniform print quality across the web.
| Downstream segment | Standard or regulation | Technical parameter | Control or limit |
|---|---|---|---|
| Interior matt paint | EU 2004/42/EC | VOC | 30 g/L |
| Flexographic ink | EU 10/2011 / EU 2020/1245 | Overall migration | 10 mg/dm² |
| PVAc laminating adhesive | FDA 21 CFR 175.105 | Indirect food contact | Ingredient listed; no transfer to food |
| Styrene-acrylic latex | ISO 13741-1:1998 | Residual styrene | ≤100 mg/kg |
| Pigment concentrate | ISO 1524:2020 | Fineness of grind | ≤5 μm |
| Waterborne metal primer | ISO 4628-1:2016 | Film defects | ≤5/ft² |
Roller-coater stations in corrugating and laminating plants running polyvinyl acetate homopolymer or vinyl acetate-ethylene dispersion adhesives are sensitive to foam build-up at the chrome steel nip because entrained air appears as bubble streaks on the glued substrate. Tech-3488 is introduced as a post-synthesis addition at 0.10–0.30 wt% based on wet adhesive weight, after the borax-dextrin or hydroxyethyl starch component has been fully hydrated. The ready-to-use adhesive viscosity is 3000–8000 mPa·s measured by a Brookfield RVT viscometer, spindle 6, at 20 rpm and 25°C. The defoamer is added as a 1:4 dilution in process water under low-shear paddle agitation at 150–250 rpm for 10–15 min; high-shear injection is avoided because emulsified droplets can coalesce in storage and form surface oil. Roller application is carried out at 40–120 m/min on clay-coated board, label paper, and spiral-wound tube stock. Bond strength is measured according to ISO 11339:2010 or ASTM D903-17 on the specified substrate, and wet tack is checked by finger transfer. Over-addition above 0.50 wt% can generate fisheyes in the adhesive film and reduce wet tack because polydimethylsiloxane migrates to the air-adhesive interface. For indirect food contact, the formulation must comply with FDA 21 CFR 175.105 and 21 CFR 176.170 where the adhesive may contact dry food through paper or board.
During the production of styrene-acrylic latex for architectural coatings, the post-polymerization stripping stage in a 10–20 m³ glass-lined batch reactor at 55–65°C and −0.08 to −0.09 MPa is operated to reduce free styrene and butyl acrylate monomer. Foam generated by residual surfactant and steam distillation can carry latex into the overhead condenser, increasing fouling and batch-to-batch variation in residual monomer measured by ISO 13741-1:1998. Tech-3488 is charged at 50–200 mg/kg of reactor solids after the last redox initiator chase and before vacuum is applied. The product is added as a 10% dispersion in demineralized water through the reactor feed nozzle under agitator speed of 40–60 rpm. At the stated dose, polyether-modified siloxane does not destabilize the latex, but coagulation must be checked by filtering the final batch through a 150 μm sieve. The terminal latex is used in exterior semigloss and satin architectural coatings; downstream film defect panels must be run before shipment because silicone defoamer carryover at concentrations above 500 mg/kg latex solids can produce craters in waterborne alkyd-modified coatings.
Process control includes monitoring condenser pressure drop, which should remain below 5 kPa to prevent foam carryover. The defoamer is not introduced during the emulsion polymerization itself because premature addition at 70–80°C can lower conversion by reducing monomer mass transfer in the micellar phase. This operational boundary is verified by residual monomer measurement and by particle size analysis using dynamic light scattering under ISO 22412:2017. In production records, batch-to-batch variation in residual styrene is maintained below 100 mg/kg after 3–4 h of vacuum stripping; if foam remains after the first hour, an additional 25–50 mg/kg is allowed, provided the total addition does not exceed 300 mg/kg. The polyether-modified siloxane is preferred over mineral-oil defoamers in this application because it has a lower tendency to produce hydrocarbon volatiles in the latex.
Titanium dioxide, iron oxide, and mixed-metal oxide concentrates for in-plant tinting are processed on horizontal bead mills filled with 0.8–1.2 mm yttrium-stabilized zirconia beads at mill-base solids of 65–75% by mass. Air incorporation in the premix increases mill temperature and reduces throughput because the grinding chamber becomes partially air-bound. Tech-3488 is added to the premix before milling at 0.05–0.20 wt% on total mill-base weight, using a high-speed disperser at 10–12 m/s tip speed for 5–10 min. Fineness of grind after 120–180 min of milling is verified with ISO 1524:2020; typical specifications are ≤10 μm for iron oxide concentrates and ≤5 μm for transparent iron oxide grades. The finished colorant is then let down into anionic surfactant-stabilized binder systems; the defoamer has a neutral pH and does not alter the zeta potential of the pigment concentrate. Over-addition above 0.30 wt% can create flooding or floating in the tinted base paint, so the mill-base batch record sets 0.25 wt% as the upper control limit. Viscosity of the mill base is held at 80–120 KU at 25°C; density is measured according to ISO 2811-1:2016. Terminal use of the concentrate is in waterborne architectural paints and industrial maintenance coatings.
In waterborne metal-coating primers where flash rust inhibitors and amine-neutralized acrylic resins are combined, foam entrapment during dip and flow-coat application is controlled by adding Tech-3488 at 0.10–0.40 wt% after the rust inhibitor has dissolved and the pH has been stabilized at 8.0–8.8. The product is introduced under low-shear agitation in the production tank before transfer to the coating line. Electrostatic bell applicators with fluid delivery rates of 200–600 mL/min are sensitive to surface-active additives; therefore, the defoamer is qualified by a bell-cup wetting test using a 60 kV electrostatic field. Coating film defects after drying at 120°C for 20 min are assessed according to ISO 4628-1:2016 and ISO 4628-4:2016; pinhole counts above 5/ft² are rejected. The terminal product is a waterborne alkyd or acrylic metal primer for agricultural equipment and steel furniture. In this segment, the maximum silicone level is limited by the need for overcoating; if the dried primer is to be topcoated with a solventborne polyurethane, surface tension of the dry film is verified with dyne test solutions at ≥40 mN/m before topcoat application.
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Tech-3488 General Polyether-Modified Silicone Defoamer–Tego-1488 Alternative is supplied as a solvent-free polyether-modified polysiloxane liquid with a representative nonvolatile content of ≥95 wt% when tested under ISO 3251:2019 at 105 °C for 2 h. The product is formulated for aqueous medium systems in which microfoam, macrofoam, and entrapped air must be controlled without introducing surface defects into the dried film. Liquid density is typically 1.02–1.04 g/cm³ by ISO 2811-1:2016, and dynamic viscosity at 25 °C falls between 800–1,600 mPa·s using ISO 2884-1:1999 cone-plate geometry at 100 s⁻¹. Because the hydrophobic silicone segment is partially shielded by polyether chains, the material remains processable in many glycol-bearing and surfactant-rich waterborne formulations while retaining limited incompatibility for air-liquid dewetting. Flash point by ISO 2719 is above 100 °C, and pour point by ISO 3016 is below 0 °C; the material is therefore not classified as flammable under normal transport conditions.
Historically, Tego-1488 has been applied in waterborne acrylic flexographic inks at addition rates between 0.1 wt% and 0.7 wt%. Tech-3488 is evaluated within the same dosing window. In a 45 wt% solids styrene-acrylic binder system, foam collapse after mechanical stirring at 3,000 rpm for 2 min with a Cowles blade was observed to be within ±10% of the reference residual foam volume. Published data for this specific configuration is limited; therefore, mill trials remain necessary to establish the optimum addition point and avoid over-deaeration at high press speeds.
Unmodified polydimethylsiloxane defoamers provide rapid foam knock-down but can accumulate at the coating-air interface and produce craters, especially in clear topcoats. Mineral oil-based defoamers reduce raw material cost but may exude under high humidity and reduce block resistance after film formation. Polyether polyols without silicone generally lack the surface tension reduction needed in media with dynamic surface tension below 30 mN/m. Tech-3488 combines a polysiloxane carrier with pendant polyether groups, generating a controlled incompatibility that disrupts foam lamellae without forming large hydrophobic droplets. The surface tension of a 0.1 wt% dilution in deionized water is typically 22–24 mN/m at 25 °C by ISO 304. The practical difference is most evident in waterborne flexographic inks at 100–200 m/min, where entrained microfoam in the return line collapses without re-stabilizing in the anilox cells. Compared with the Tego-1488 reference, Tech-3488 exhibits a slightly higher shear-stable viscosity plateau and a narrower dispersed droplet size after high-shear incorporation; this difference reduces visible haze in unpigmented overprint varnishes but requires the same attention to addition order.
In waterborne flexographic and gravure ink letdowns, the recommended addition point is post-grind during high-shear mixing. Addition during pigment dispersion can reduce deagglomeration efficiency if the defoamer coats pigment surfaces before wetting is complete. The material is typically introduced at 0.3–0.6 wt% of the finished ink during letdown, using a dissolver or inline rotor-stator mixer operating above 10 m/s tip speed. When only low-shear mixing is available, a pre-dilution with propylene glycol or dipropylene glycol dimethyl ether at a 1:1 mass ratio improves distribution and prevents localized oily film formation. In multi-color flexographic presses with a common return tank, the product demonstrates pH tolerance between 4.0 and 9.0, although shifts above pH 9.2 may increase the coalescence lag time. On a central-pressure flexographic press running waterborne ink at 120 m/min, foam-related pinholes in a 12 µm wet film were eliminated by adding 0.4 wt% Tech-3488 after the final viscosity adjustment. The use of ISO 2431-5:2019 flow cups showed no statistically significant change in efflux time, indicating that the product did not interact with the associative thickener.
The processing window for gloss-sensitive clearcoats is narrower than for pigmented systems. A formulation gradient in a 45 wt% solids waterborne styrene-acrylic clearcoat showed that 20° gloss loss remains below 1–2 GU between 0.35 wt% and 0.60 wt%, while the transition to 1.0 wt% produced a non-linear gloss decrease of 7 GU according to ASTM D523-14. The likely mechanism is excess dewetting at the film surface when the concentration exceeds the associative thickening network’s capacity to maintain micelle separation. For this reason, 0.7 wt% is a practical upper limit in high-gloss clearcoats, while 1.0 wt% may be considered only in pigmented or matte systems where gloss is not the primary specification.
| Tech-3488 addition (wt%) | ISO 2884-1 high-shear viscosity at 10,000 s⁻¹ (mPa·s) | ASTM D523-14 20° gloss (GU) | ISO 2431-5 flow time (s) | Visual film defects by ASTM D4062-16 |
|---|---|---|---|---|
| 0.00 | 180 | 82 | 28 | Severe pinholes |
| 0.15 | 175 | 82 | 27 | Isolated pinholes |
| 0.35 | 172 | 81 | 26 | No visible defects |
| 0.60 | 170 | 79 | 25 | No visible defects |
| 1.00 | 168 | 75 | 24 | Slight haze and cratering |
In waterborne acrylic overprint varnishes, the product is added to the letdown after coalescing solvents have been incorporated. Because coalescents temporarily reduce the continuous-phase polarity, adding Tech-3488 before butyl glycol or Texanol can delay air release during the initial drying phase. A 0.3 wt% dose in a 35 wt% solids waterborne acrylic varnish with 8 wt% 2-butoxyethanol eliminated microfoam under vacuum drawdown without reducing adhesion to corona-treated polyethylene terephthalate film at 40 mN/m wetting tension. Cross-cut adhesion according to ASTM D3359-17 remained 5B on both treated polyester and oriented polypropylene.
On rigid polyvinyl chloride sheet coatings and aqueous polyurethane dispersion floor finishes, foam entrapment during roller application produces air voids that reduce chemical cleaning resistance. Tech-3488 is introduced at 0.2–0.5 wt% of total formulation before the final matting agent dispersion. In a two-component waterborne polyurethane floor coating with 32 wt% solids, a 0.4 wt% dose eliminated foam-related defects after roller application at 20 °C and 55% relative humidity. The coated surface retained its slip resistance after curing, with no measurable silicone bloom at the surface by ASTM D2578 wetting tension measurement. However, for systems requiring recoatability after 24 h, the upper dose should be limited to 0.3 wt% because higher concentrations can lower the critical surface tension of the cured surface and affect intercoat adhesion. This limitation is shared with Tego-1488 and is not unique to Tech-3488.
Foam collapse rate rather than equilibrium foam height controls print quality on high-speed presses because ink is recirculated through a return tank with a residence time of only 30–90 s. Tech-3488 has a rapid bubble-burst response at low shear but remains shear-stable when passing through anilox cells. In laboratory evaluation using a modified Ross-Miles method based on ISO 696, a 0.25 wt% aqueous dilution of Tech-3488 reduced initial foam height from 14 cm to 4 cm after 1 min. The result was obtained in a 0.5 wt% sodium dodecyl sulfate solution at 25 °C, which is a harsher surfactant matrix than most waterborne printing inks. The reference Tego-1488 produced a residual foam height of 5 cm under the same conditions. The numerical difference is within normal batch variation, indicating functional equivalence for macrofoam knock-down. For microfoam generated by high-speed pumping, the Tech-3488 product should be evaluated with a circulation loop and bubble-size imaging; because the polyether chain length distribution is narrower than some generic silicone polyethers, the coalescence of sub-50 µm air bubbles is more reproducible across batches.
On an eight-station central-pressure flexographic press with a common return tank, a production trial at 150 m/min showed air volume fraction in the return line decreasing from 2.5% to 0.8% after addition of 0.35 wt% Tech-3488. The measurement was taken with a density-compensated mass flow meter. Foam-related pinholes disappeared after 80 min of continuous printing, which corresponded to three full return-tank turnovers. Batch-to-batch pH variation from 8.4 to 9.2 was identified as the main source of residual foam scatter in repeated trials; buffering the ink at pH 8.6 reduced the foam break-time standard deviation from ±18 s to ±6 s. This operational limit must be considered when comparing defoamer performance across production shifts.
The product is not classified as hazardous under CLP Regulation (EC) No 1272/2008 in the supplied form. It is manufactured under a quality system aligned with ISO 9001:2015. Transport classification under ADR/RID/IMDG does not require a hazard label. Representative release specifications appear in the table below.
| Parameter | Method or designation | Specification |
|---|---|---|
| Nonvolatile content | ISO 3251:2019, 105 °C, 2 h | ≥95 wt% |
| Density | ISO 2811-1:2016 | 1.02–1.04 g/cm³ |
| Dynamic viscosity | ISO 2884-1:1999, 25 °C, 100 s⁻¹ | 800–1,600 mPa·s |
| Surface tension of 0.1 wt% aqueous dilution | ISO 304 | 22–24 mN/m |
| VOC content | US EPA Method 24 | <1 wt% |
| REACH status | (EC) No 1907/2006 | Polymer registration maintained where required |
| Food-contact coatings | 21 CFR 175.300 | End-use extraction testing required |
Storage in sealed high-density polyethylene or lined steel containers at 5–35 °C is recommended. At temperatures below 5 °C, the product may thicken; if viscosity increases, gradual warming to 20–25 °C before use restores package handling. Prolonged exposure to direct sunlight or storage above 40 °C may increase the formation of trace hydrolysis by-products and reduce defoamer efficiency. The product is not compatible with strong oxidizing agents, concentrated mineral acids, or concentrated caustic solutions. In formulations with pH below 3.0 or above 10.0, the polyether link can undergo hydrolytic scission over time, causing a loss of controlled incompatibility. Published data for this specific configuration is limited; therefore, laboratory stability trials at the intended pH and temperature are required before full-scale use.
For polyvinyl acetate and ethylene-vinyl acetate emulsion adhesives, foam entrapment during drum pumping reduces metering accuracy in gear pumps. In trials on a corrugated laminating line running 45 m/min, addition of 0.05–0.2 wt% Tech-3488 to the wet adhesive after preservative addition reduced foam height by 80% relative to an untreated control using a modified Ross-Miles method based on ISO 696. The product is not recommended for one-part moisture-curing polyurethane adhesives because residual silicone can interfere with substrate wetting; for two-part epoxy systems, compatibility should be confirmed before use because amine hardeners can shift the interfacial tension balance. In industrial water treatment where antifoam may contact filtration membranes, preliminary membrane flux testing is required, as silicone polyether materials can adsorb onto hydrophobic membrane surfaces and reduce permeate output after extended exposure.
