Section
| HS Code | 708472 |
| Product Name | Tech-3868 High-Viscosity Heavy-Duty Defoamer Compound (Momentive 750S Alternative) |
| Active Content | 100% |
| Appearance | Opaque viscous liquid |
| Color | White to off-white |
| Chemical Family | Silicone-based high-viscosity defoamer compound |
| Viscosity At 25 C | 9,000–12,000 cP |
| Specific Gravity At 25 C | 0.99–1.02 |
| Ph 1 Dispersion | 6.0–8.0 |
| Flash Point Closed Cup | >93°C |
| Water Solubility | Insoluble in water; self-dispersing |
| Operating Temperature Range | 5°C to 80°C |
| Shelf Life | 12 months from date of manufacture |
As an accredited Tech-3868 High-Viscosity Heavy-Duty Defoamer Compound–Momentive 750S Alternative factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Tech-3868 defoamer alternative is packaged in 55-gallon drums and 5-gallon pails, sealed for safe, heavy-duty industrial use. |
| Container Loading (20′ FCL) | 20′ FCL: full container load of Tech-3868 defoamer, palletized drums, secured bracing, labeled, no co-loading. |
| Shipping | Tech-3868 ships in sealed, moisture-resistant drums or pails, via ground freight only. Keep containers upright, away from extreme heat or freezing. No special hazmat designation for standard transport, but proper labeling and secure loading are required. Inspect for leaks upon receipt and store in a cool, dry area. |
| Storage | Store Tech-3868 in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and oxidizers. Maintain temperatures between 5–30°C (41–86°F); do not freeze. Protect from moisture and contamination. Keep containers upright and off the floor. Use within stated shelf life, avoiding prolonged storage after opening. |
| Shelf Life | Shelf life is 12 months from manufacture date when stored unopened in original container below 40°C. |
In high-solids two-component epoxy and polyurethane protective coatings, the reduction of volatile organic content has compressed the open film window and extended the residence time of entrained air bubbles in the wet layer. Airless spray application at fluid pressures between 15 MPa and 25 MPa through 0.43 mm to 0.66 mm tungsten carbide spray tips generates a steep pressure drop at the orifice that can froth insufficiently degassed mixed material. Bubbles retained after atomization and leveling are not readily released by solvent evaporation because the coating viscosity recovers rapidly after deposition. Tech-3868, positioned as a high-viscosity heavy-duty defoamer compound and Momentive 750S alternative, is introduced into the batch to rupture microfoam through a silicone/silica spreading mechanism rather than through solvent dilution. The required addition ratio is governed by pigment volume concentration, batch shear history, and the target film thickness. Typical charge levels are 0.15–0.35 wt% of total formulation for epoxy zinc-rich primers and 0.10–0.25 wt% for high-gloss isocyanate-cured polyurethane topcoats. Charge levels at or above 0.50 wt% can exceed the spreading tolerance of ambient-cure epoxy binders and produce intercoat adhesion loss visible as ISO 2409 crosshatch ratings below grade 2. Incorporation into production batches is normally performed during letdown after the pigment dispersion has reached a Hegman grind of 5–7 and the batch temperature has fallen below 45°C. The high-viscosity defoamer compound is pre-dispersed in a compatible aromatic or ester solvent at 1:3 to 1:5 mass ratio before addition to prevent localized silicone-rich agglomerates from forming craters, fish eyes, or gloss mottling. In a top-entry dissolver equipped with a 0.3 m diameter high-speed disperser, a blade tip speed of 10–15 m/s maintained for 10–15 min is sufficient to achieve deagglomeration without over-shearing the hydrophobic silica composite. In-line rotor-stator devices provide narrower residence time distribution and more repeatable batch-to-batch air-release performance than batch dissolvers, but mechanical energy above 1,200 rpm in a small-clearance rotor-stator can shear the hydrophobic silica agglomerates and reduce defoamer efficiency after storage. Production-scale failure modes observed on twin-shaft mixing lines include loss of air release when the defoamer is added too early in the pigment dispersion cycle, because pigment grinding particles abrade the dispersed defoamer droplets and the active material becomes occluded on pigment surfaces. Delayed addition immediately before thinning can leave undispersed silicone striations in the final film. Compliance boundaries for the coating system include EU Directive 2004/42/EC Annex IIB VOC limits for heavy-duty protective coatings, ASTM D2369-20 for volatile organic content determination, ISO 11890-2:2020 for VOC measurement, ISO 12944-5:2018 and ISO 12944-6:2018 for corrosion protection system selection and performance, and NORSOK M-501:2022 for offshore coating qualification where applicable. Terminal finished product types include high-solids epoxy zinc-rich primers, isocyanate-cured polyurethane topcoats for structural steel, offshore splash-zone maintenance coatings, wind turbine tower fairing compounds, and solventborne epoxy tank-lining intermediate coats. The compound is not used in food-contact can coatings unless a separate FDA 21 CFR 175.300 suitability determination is completed for the specific resin system.
| Compliance parameter | Test method / standard | Measurement condition | Acceptance boundary |
| Volatile organic content | ISO 11890-2:2020 | 60 min at 110°C | ≤ 500 g/L under EU 2004/42/EC Annex IIB for heavy-duty protective coatings |
| Crosshatch adhesion | ISO 2409:2020 | 2 mm spacing, tape pull | grade 0–1 on Sa 2.5 blast-cleaned steel |
| Specular gloss | ISO 2813:2014 | 60° geometry | ≥ 80 GU for gloss topcoat |
| Pendulum hardness | ISO 1522:2022 | König, 23°C, 50% RH | ≥ 120 s after 7 days cure |
Sheetfed offset packaging lines running at 14,000 to 18,000 sheets per hour trap foam in radiation-curable overprint varnishes because the liquid-to-crosslinked-network transition occurs within 0.1–0.5 s under ultraviolet or electron-beam irradiation, leaving insufficient time for buoyant bubble release. Tech-3868 is introduced into the varnish letdown tank at 0.05–0.20 wt% of total varnish weight when foam carryover from inline pumping and chambered doctor-blade recirculation becomes visible as micro-bubble haze in the cured film. Downstream incorporation is made after acrylate oligomers and photoinitiators have been dissolved in the monomer blend and after the last pigment press cake or carbon black dispersion has reached a grind of 5 NS on the Hegman gauge. The high-viscosity defoamer compound is first diluted 1:2 in tripropylene glycol diacrylate or ethoxylated trimethylolpropane triacrylate carrier to prevent shock separation in the low-viscosity monomer phase. Excessive addition above 0.30 wt% can reduce cure response at the film surface and produce reticulation defects in low-energy-cure clear varnishes. Terminal finished product types include UV-curable sheetfed offset inks, UV flexographic varnishes, EB-cured food-packaging overprint coatings, and digital inkjet primer varnishes when the defoamer is incorporated in the primer at 0.02–0.10 wt%. Compliance boundaries are established by the EuPIA Suitability List for indirect food-contact printing inks, Swiss Ordinance SR 817.023.21 as applicable, REACH Annex XVII restrictions, and EU 10/2011 overall migration requirements when the printed film forms part of a laminate intended for food contact. No single published standard method addresses defoamer efficiency in radiation-curable varnishes directly; production trials commonly measure cured-film microfoam by transmitted-light microscopy at 50× after a 20 µm wire-wound drawdown and compare bubble density against an internal threshold of fewer than 5 bubbles per 1 mm².
Across 2,000 L stainless steel reactor campaigns for solvent-based polyurethane laminating adhesives, batch-to-batch variation in film openness is often linked to the final degassing step rather than to free isocyanate content. Tech-3868 is added at 0.05–0.20 wt% of total reactor charge after prepolymer chain extension has been completed and residual isocyanate content has been verified by ASTM D2572-19 at 1.5–3.0 % NCO. The downstream production process involves addition through the reactor manway under nitrogen blanket after the batch temperature has been reduced to 50–60°C, followed by agitator rotation at 20–40 rpm for 15–30 min to avoid gas entrapment above the liquid surface. High-viscosity defoamer compound is pre-dispersed 1:4 in ethyl acetate or methyl ethyl ketone before addition, because direct addition to a high-viscosity adhesive mass can create clear silicone-rich striations that migrate to the coating/substrate interface in the final laminate. Terminal finished product types include two-component high-solids polyurethane laminating adhesives for flexible food packaging, one-component moisture-curing sealants for automotive aftermarket repair, and solvent-borne polyurethane heat-seal primers for aluminum foil. Industry compliance standards include FDA 21 CFR 175.105 for adhesives used in food-contact laminates, EU 10/2011 for overall migration from the finished structure, and REACH substance restrictions. For automotive interior sealants, VOC and semi-volatile organic compound emissions may be tested under VDA 278:2011 thermodesorption, where the defoamer compound must not increase volatile siloxane release above the lower limit of 10 µg/g in the final cured film. Published data for the specific siloxane emission contribution of this defoamer compound in polyurethane systems is limited, so pre-production emission testing is required when the laminate is destined for cabin-air quality-controlled vehicle platforms.
At separator inlet temperatures above 65°C, crude oil knockout drums processing high gas-to-oil ratios can develop persistent foam above the oil/water interface when produced water, formation solids, and naturally occurring surface-active components stabilize gas bubbles. Foam carryover reduces oil retention time, contaminates the water leg with hydrocarbons, and can trip level controls on downstream degassing boots. Tech-3868 is injected as an oil-continuous defoamer compound into the production flowline or directly upstream of the separator inlet device at 5–30 ppmv of total liquid production for oil-continuous emulsions and at 20–50 ppmv for high-water-cut slug flow when foam persists after water clarification. The downstream production process uses positive-displacement chemical injection pumps discharging through a quill into the center of the flowline at a linear gradient of 3–8 m/s to ensure dispersion before the inlet choke. In gas-affected separation trains, the compound is diluted 1:9 in heavy aromatic naphtha or field condensate to reduce viscosity at the injection point. Terminal finished product types from the treated stream include pipeline-stabilized crude oil, produced water suitable for secondary treatment or re-injection, pipeline-quality natural gas after dehydration, and reduced-volume oily sludge sent to recovery. Industry compliance standards include API 14C safety analysis for process component identification, ISO 10423:2009 for wellhead and separator equipment, EPA NPDES discharge permits for treated produced water, and the OSPAR Commission harmonized offshore chemical notification format for marine discharges where applicable. A documented operational boundary is that this defoamer compound should not be used as the sole demulsifier in high-water-cut emulsions, because its oil-continuous character limits diffusion into the water phase; water-continuous foam at the water leg outlet requires a separate water-dispersible defoamer or a co-injection quill downstream of the oil/water interface.
Water-dilutable semi-synthetic and synthetic metalworking fluid concentrates are prone to tramp oil/air emulsification in central sumps serving high-speed grinding and drilling cells. Tech-3868 is incorporated into the oil phase of a semi-synthetic emulsifiable oil concentrate at 0.05–0.15 wt% of the neat concentrate before the emulsifier package is added and before water is introduced for inversion. The downstream concentrate manufacturing process uses a 1,000 L jacketed blending vessel with a scraper-gate agitator at 30–60 rpm and a rotor-stator circulation loop set to 1,500–3,000 rpm. The defoamer compound is diluted 1:3 in 40°C naphthenic base oil and metered over 10 min to prevent high local silicone concentration. Terminal finished product types include high-oil semi-synthetic coolants for cast iron transfer lines, synthetic grinding fluids for bearing races, and heavy-duty tapping compounds formulated as oil-based pastes with 0.3–0.8 wt% Tech-3868. Industry compliance standards include ISO 6743-7:2023 for metalworking fluid classification, ASTM D2519-20 for copper corrosion, and ASTM E2271-05a for health and safety screening. In German machining environments, TRGS 611 and TRGS 900 occupational exposure limits apply when fluids are sprayed under pressure. A technical limitation is documented in aluminum hot rolling oil emulsions, where a polydimethylsiloxane-based defoamer can contaminate foil surfaces and degrade dezincification resistance after annealing; the compound is excluded from rolling-oil formulations unless subsequent solvent degreasing is installed.
Kraft mills operating falling-film evaporators on black liquor solids above 50% frequently encounter foam carryover from the flash vapor, which reduces heat transfer and can force unscheduled evaporator washes. Tech-3868 is fed as an oil-based heavy-duty defoamer compound into the weak black liquor feed at 0.2–0.8 kg per metric ton of dry black liquor solids, with the lower portion of the range preferred when downstream tall oil soap skimming is sensitive to silicone contamination. The downstream production process adds the compound after weak black liquor oxidation and before the first evaporator effect, using a low-shear continuous metering pump with the neat product warmed to 40–50°C to lower viscosity. Dispersion is completed by the flow velocity through the liquor feed line, typically 1.5–3.0 m/s, rather than by an additional high-shear mixer. Terminal finished product types from the pulp mill include bleached softwood market pulp, unbleached linerboard, kraft sack paper, crude tall oil, and lignin-rich precipitate streams. Industry compliance standards include FDA 21 CFR 176.210 for defoaming agents used in the manufacture of paper and paperboard, EU 1935/2004 for food-contact materials, BfR Recommendation XXXVI for paper and board for food contact, and ISO 302:2015 for pulp Kappa number determination when defoamer carryover has potential to affect bleach chemical demand. The principal operational boundary is silica deposition on evaporator surfaces at sustained addition above 1.0 kg/t of black liquor solids; in such cases the mill must increase sulfamic or formic acid washes or switch to a lower-silica defoamer architecture. Published data for the specific deposition rate of this defoamer compound in high-solids evaporator trains is limited, so mill trials should monitor evaporator heat transfer coefficient in the first and second effects for at least 500 h before full adoption.
Mixed reaction side streams entering solvent recovery distillation columns often contain dissolved polymers, salts, and surfactants that stabilize foam in the reboiler and on tray decks, increasing pressure drop and reducing overhead purity. Tech-3868 is metered into the incoming waste solvent feed at 5–50 ppmw based on total feed flow, with the exact rate adjusted against differential pressure across the column. The downstream production process includes continuous injection into the feed preheater suction line, followed by a static mixing element upstream of the reboiler to distribute the defoamer before thermal degradation begins. In high-temperature operation above 140°C, the defoamer compound is diluted 1:10 in recovered high-boiling solvent to avoid localized fouling on the reboiler tube sheet. Terminal recovered product types include reclaimed ethyl acetate, methyl ethyl ketone, toluene, mixed glycol ethers, and non-polymerizable solvent blends for reuse in industrial cleaning or coating letdown. Industry compliance standards include ATEX 2014/34/EU for equipment in potentially explosive atmospheres, ISO 4126-1:2013 for safety relief device sizing on the column, REACH Annex II safety data sheet requirements, and EN 13445 for unfired pressure vessel design. An operational boundary is that silicone-based defoamer compounds can leave trace siloxane contamination in recovered solvent, which may interfere with downstream catalytic oxidation or electronics-grade solvent specifications; for such recovered streams, post-distillation adsorbent treatment or a non-silicone defoamer is required. The compound is therefore excluded from monomer recovery trains feeding catalytic oxidation without a post-distillation siloxane guard bed.
Competitive Tech-3868 High-Viscosity Heavy-Duty Defoamer Compound–Momentive 750S Alternative prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Tech-3868 is a high-viscosity, heavy-duty defoamer compound supplied as a 100 % active dispersion of hydrophobized fumed silica in a high-molecular-weight polydimethylsiloxane carrier. The product is compounded as a direct alternative to Momentive 750S in industrial foam-control applications where the foam challenge is dominated by high surfactant loading, high electrolyte concentration, or repeated exposure to centrifugal pumps. Release specifications are controlled under ISO 9001:2015 lot traceability. The material is an off-white to pale amber viscous liquid with a specific gravity of 0.995–1.015 at 25 °C by ASTM D4052. Dynamic viscosity is 2,200–2,800 mPa·s at 25 °C by ASTM D2196, and water content is <0.2 wt% by ISO 15512. Flash point is >200 °C by ASTM D92, and non-volatile content is >99.0 wt% after 3 h at 105 °C by ISO 3251.
| Property | Value | Test method |
|---|---|---|
| Appearance | Off-white to pale amber viscous fluid | ASTM D4176 |
| Viscosity at 25 °C | 2,200–2,800 mPa·s | ASTM D2196 |
| Specific gravity at 25 °C | 0.995–1.015 | ASTM D4052 |
| Water content | <0.2 wt% | ISO 15512 |
| Flash point | >200 °C | ASTM D92 |
| Non-volatile content | >99.0 wt% after 3 h at 105 °C | ISO 3251 |
In end-use addition, the material is usually fed as received without dilution. Solvent dilution with low-boiling aromatic or aliphatic hydrocarbons is possible only for oil-based defoaming applications and must be tested for silica settling; water-based pre-dilution is not recommended because the product is not self-emulsifying and will form an unstable inverse emulsion under static storage.
In a 2.5 m diameter countercurrent packed tower treating 1,200 m³ h−1 of quench gas, foam accumulation in the sump often forces a reduction of gas velocity because entrained droplets carry into the mist eliminator. Tech-3868 is metered into the scrubber sump at 10–20 ppm based on the recirculating liquid volume using a positive-displacement pump with EPDM or PTFE seals. The product is injected into the return line downstream of the recirculation pump, not into the pump suction, to avoid unnecessary shear before the defoamer droplets reach the foam layer. In a representative evaluation on a 40 m³ h−1 recirculation loop with a 1.1 kW top-entry mixer at 300 rpm, foam thickness over the sump decreased from 250 mm to 60 mm within 12 min after the dose was increased from 5 ppm to 15 ppm. The residual foam thickness was measured by a conductivity probe positioned 0.5 m below the sump rim. The alkaline scrubber liquor contained 8 wt% sodium carbonate and 0.3 wt% of a nonylphenol-free ethoxylated surfactant, with pH 10.2. Under these conditions, the defoamer remained active for 6 h without re-addition; foam thickness returned to 220 mm only after 8 h, indicating gradual depletion by bubble entrainment and surface adsorption rather than immediate phase collapse. The feed line after the injection quill is sized for a velocity of 0.3–0.5 m s−1; because Tech-3868 has a high viscosity, a 12 mm ID line at 2 bar pressure can deliver the required dose without slugging. In the same installation, replacement of a 350 cSt silicone defoamer with Tech-3868 reduced foam carryover into the chevron mist eliminator by 45 % over a 72 h period, as measured by differential pressure across the mist eliminator.
High-shear dispersion can reduce the performance of any silicone defoamer if the dispersed droplet size is driven below the critical film-bridging diameter. When Tech-3868 is injected through an inline rotor-stator mixer operating at a tip speed of 10 m s−1, the compound forms droplets in the 5–15 µm range, as measured by laser diffraction under a wet dispersion cell. Knockdown time in a 0.5 wt% sodium lauryl ether sulfate solution at 25 °C is 7 s after 3 min of mixing at 500 rpm in a 2 L graduated cylinder with air sparging through a 10–16 µm sintered frit at 0.5 L min−1. If the same dose is pre-sheared through a rotor-stator at 18 m s−1 for 10 min, the median droplet size drops below 2 µm, and knockdown time increases to 24 s. The apparent film tension in the test surfactant solution was 45 mN m−1 at 25 °C by ISO 304 Wilhelmy plate. The mechanism is attributed to a loss of bridging capacity when the droplet volume is too small to span the foam lamellae. For this reason, the product is added after the main high-shear mixing step or through a low-shear recirculation loop. In a recirculation test through a centrifugal pump at 3,450 rpm for 60 min, the knockdown time changed from 7 s to 11 s. Under the same test conditions, a conventional 350 cSt silicone defoamer compound changed from 8 s to 19 s, showing greater sensitivity to pump-induced droplet breakage. The comparison was made in a 20 L stainless steel recirculation rig with a 0.37 kW centrifugal pump and back-pressure control at 2 bar.
In pigment dispersion and paper coating color preparation, foam collapse must be achieved without introducing visible fish-eyes. Tech-3868 is added at 0.05–0.2 wt% of calculated dry pigment mass after the dispersion viscosity has exceeded 1,000 mPa·s. In a 200 L pilot batch of 70 wt% kaolin slurry mixed with a Cowles disperser at 1,200 m min−1 tip speed, foam height was reduced from 140 mm to 35 mm within 5 min after addition of 0.1 wt%. No fish-eyes greater than 100 µm were detected on a drawdown bar at 50 µm wet film thickness. The addition point was moved to the post-dispersion dilution tank because high shear in the Cowles stage reduced the droplet size below the critical bridging diameter and increased the required dose by 35 %.
Silicone defoamer compounds are not thermodynamically stable suspensions; the hydrophobized silica can settle or the carrier fluid can develop a clear serum layer during extended static storage. In a 6 month storage study at 25 °C, Tech-3868 developed a superficial serum layer of <2 mm in a 1 L polyethylene container. At 40 °C, the serum layer reached 4–6 mm after 8 weeks, but viscosity of the re-mixed material remained within ±10 % of the initial value by ASTM D2196. If a serum layer above 5 mm forms, the material should be re-dispersed with a low-shear paddle at 50–100 rpm for 10 min before transfer to the metering line. At 5 °C, the viscosity can increase to 8,000–12,000 mPa·s, which may exceed the suction capacity of small gear pumps. Apparent viscosity at 25 °C under a shear rate of 1 s−1 is 6,000–9,000 mPa·s, while at 100 s−1 it drops to 2,200–2,800 mPa·s, indicating pseudoplastic behavior that assists drum pump feed but must be considered when calculating pressure drop in long transfer lines. Warehousing below 10 °C should therefore include drum warming to 20–30 °C before use. The product is supplied in 200 kg drums and 1,000 kg IBCs; a drum pump with a viscosity capability of 20,000 mPa·s at 20 °C is suitable. Air-operated diaphragm pumps with 6 mm ball checks are not recommended for continuous metering below 5 °C because the material can bridge the check balls and cause cavitation. The product should not be stored in direct sunlight or in contact with copper, brass, or zinc, because trace metal ions can catalyze siloxane rearrangement and produce a reversible haze that complicates in-line flow verification. Prolonged contact with concentrated mineral acids above 10 wt% is not recommended, since hydrolytic cleavage of the siloxane backbone may reduce viscosity and re-emulsify the defoamer. The compound is also not recommended for combination with amine-catalyzed epoxy curing systems where free amine can adsorb onto the hydrophobized silica and reduce particle lipophilicity, leading to a drop in bubble-film penetration after 24 h of contact.
The difference is not solely viscosity. A conventional 350 cSt silicone defoamer compound may contain lower silica structure and is sheared into small droplets rapidly but also degrades rapidly in recirculation loops. Tech-3868 is formulated with a higher silica structure and a longer siloxane chain, which increases the elongational viscosity of the compound and improves adhesion to the foam lamella. In a comparative test using a 0.5 wt% sodium dodecylbenzenesulfonate solution at 80 °C, the Momentive 750S benchmark delivered a knockdown time of 8 s at a dose of 0.1 wt%, while Tech-3868 delivered 7 s. The differentiation appeared after 30 min of sustained bubble sparging: residual foam height with the benchmark was 210 mm, whereas with Tech-3868 residual foam height was 130 mm. Thermogravimetric analysis by ASTM E1131 shows <0.5 wt% weight loss at 150 °C for Tech-3868, while thin-bodied defoamers containing cyclic siloxane diluents may show 2–3 wt% weight loss under the same conditions. The performance gap widened further when the test fluid contained 2 wt% sodium chloride and 0.1 wt% of a phosphate ester emulsifier, because the high electrolyte load destabilized the benchmark droplet and caused visible oiling at the liquid surface, while the Tech-3868 dispersion remained intact. Bench-scale comparisons are not a substitute for plant-specific validation.
| Comparative parameter | Conventional 350 cSt silicone defoamer | Tech-3868 | Condition |
|---|---|---|---|
| Knockdown time | 8 s | 7 s | 0.5 wt% sodium dodecylbenzenesulfonate at 80 °C, dose 0.1 wt% |
| Residual foam height after 30 min | 210 mm | 130 mm | Sustained air sparging |
| Knockdown time after 60 min recirculation | 19 s | 11 s | 20 L rig, centrifugal pump at 3,450 rpm |
| Serum separation after 6 months at 25 °C | 3–5 mm | <2 mm | 1 L PE container |
| Viscosity change after 8 weeks at 40 °C | +12 % | ±10 % | ASTM D2196 |
Regulatory documentation is issued at lot level and includes a statement of composition to support REACH compliance under Regulation (EC) No 1907/2006. The silicone polymer fraction qualifies as a polymer within the meaning of REACH Article 3(5); the hydrophobized fumed silica is listed in the EINECS inventory. RoHS screening by ASTM F2617 typically reports lead <10 ppm, cadmium <5 ppm, mercury <5 ppm, and total chromium <10 ppm. The product contains no added alkylphenol ethoxylates, organotin compounds, heavy-metal carboxylates, or halogenated paraffins. The product is not classified as hazardous for supply under CLP Regulation (EC) No 1272/2008, based on the absence of hazardous ingredients above generic concentration limits; however, a safety data sheet should be consulted for handling requirements. For indirect food-contact applications, the formulator must confirm end-use clearance under 21 CFR 176.210 or applicable national legislation; Tech-3868 is not certified for direct food additive use. Maximum continuous service temperature in aqueous foam-control duty is 120 °C. Use above 150 °C may generate volatile cyclic siloxanes and reduce defoaming efficiency. The product is not recommended for silicone-sensitive coating lines where trace silicone transfer can degrade recoatability; in such systems, a separate silicone-free defoamer should be screened.
