Section
| HS Code | 787545 |
| Product | Silcolapse 610 100% Active Silicone Antifoam Compound - Water & Non-Water Systems |
| Chemical Type | Silicone antifoam compound |
| Active Content | 100% |
| Physical Form | High-viscosity liquid compound |
| Appearance | Opaque white to off-white |
| Odour | Mild |
| Specific Gravity At 25 C | Approximately 1.0 |
| Water Solubility | Insoluble; dispersible as droplets |
| Application Compatibility | Water-based and non-water-based systems |
| Ph Range | Effective in acidic and alkaline media |
| Thermal Stability | Effective at elevated temperatures up to approximately 150°C |
| Shelf Life | Stable for at least 12 months in sealed original storage |
| Viscosity At 25 C | Typical high silicone compound viscosity |
| Ionic Nature | Non-ionic |
As an accredited Silcolapse 610 100% Active Silicone Antifoam Compound–Water & Non-Water Systems factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | This 100% active silicone antifoam compound for water and non-water systems comes in 5-gallon pails and 55-gallon drums. |
| Container Loading (20′ FCL) | One 20-foot FCL contains Silcolapse 610, 100% active silicone antifoam compound, for water and non-water systems. |
| Shipping | Silcolapse 610 ships in sealed, original containers—typically pails or drums—secured upright to prevent leakage. Protect from extreme heat, moisture, and direct sunlight. While not generally regulated as dangerous goods, standard chemical handling applies: keep away from oxidizers, use proper personal protection when loading, and store in a well-ventilated area. |
| Storage | Store Silcolapse 610 in its original, tightly closed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and incompatible materials. Avoid exposure to extreme temperatures and moisture to prevent contamination. Keep the area clear of ignition sources and ensure proper segregation from foodstuffs. Always follow the manufacturer’s SDS for specific requirements. |
| Shelf Life | Shelf life is typically 24 months from manufacture when stored unopened in original containers at moderate temperatures, protected from freezing and contamination. |
In waterborne architectural coating lines operating with high-speed Cowles dispersers at tip speeds between 18 m/s and 25 m/s, entrained air destabilizes not only letdown viscosity but also final film transparency in clear acrylic binders. Silcolapse 610 is introduced in two unequal portions: approximately 1/3 into the pigment grind and the remainder after letdown, with a total addition ratio of 0.05–0.30 wt% based on finished coating mass. The grind-stage portion controls foam generated by dispersant-wetted pigment surfaces, while the letdown portion collapses microfoam that forms when coalescent, thickener, and alkali-swellable rheology modifiers are folded into anionically stabilized acrylic or vinyl acetate-ethylene vehicles. On a 5,000 kg production batch, grind fineness is verified under ISO 1524:2013 with a Hegman reading of 5.5–6.0; lower readings typically indicate undispersed aggregates rather than residual foam. Low-shear and high-shear viscosity are logged at 10 rpm and 100 rpm on a rotational viscometer, with a low-shear/high-shear ratio above 2.4 signalling free silicone pooling and a ratio below 1.8 indicating incomplete associative thickener response. Compliance in the European architectural sector must account for the compound as a non-volatile siloxane input under Directive 2004/42/EC Annex IIA Category A/d phase II, with residual VOC verified by ISO 11890-2:2020. For gloss-sensitive topcoats, addition above 0.30 wt% raises the risk of haze and cratering because the silicone droplet size distribution shifts from 10–30 µm toward visible specks at 60 µm and above when shear is interrupted. Terminal products include scrub-resistant interior wall paints, exterior facade coatings, and low-VOC architectural primers, each requiring filtration through a 60-mesh bag or cartridge at ≤35 °C before filling to avoid coalescent-induced particle swelling.
Persistent microfoam in poly(vinyl acetate) and VAE dispersion kettles becomes adhesive under vacuum stripping when absolute pressure drops below 0.4 bar and residual vinyl acetate monomer is being reduced from 2,000 ppm to below 500 ppm; under these conditions, uncollapsed foam forms a stable cap on the liquid surface and reduces the effective vapour-removal area. Silcolapse 610 is incorporated at 0.10–0.40 wt% on wet dispersion mass, generally after the protective colloid—typically poly(vinyl alcohol) at 4–7% of monomer—has fully hydrated. Addition before hydration causes silicone droplets to adsorb onto PVA chains and generate film irregularity. The critical process window lies in the letdown phase at 40–55 °C, where the compound is metered at 0.5–1.0 kg/min into a swept-surface mixer; higher agitation rates shear the silicone into submicron droplets that remain dispersed but are inactive as defoamer, while lower rates produce an inhomogeneous distribution. Validation is carried out by rotational viscometry under ISO 3219-1:2019 at a shear rate of 500 s⁻¹, with acceptable batch viscosity drift below 8% over 24 h. For wood-bonding adhesives, EN 205:2016 type II durability criteria specify shear strength on beech at or above 10 N/mm² after water immersion; formulations with silicone levels above 0.40 wt% require a full bond-line migration check by ATR-FTIR because published data for this exact ratio is limited. Terminal formats include PVAc woodworking adhesives, VAE paper-laminating adhesives, and dispersion-based packaging glues, each requiring batch traceability under ISO 9001 from raw silicone compound to finished dispersion.
A 2,000-litre central sump running a semisynthetic coolant at 6–8% concentration experiences foam collapse failures when high-pressure delivery pumps at 70 bar entrain air into the return line; the resulting foam blanket can obscure sight-glass level readings within 20 min after make-up. In this configuration, Silcolapse 610 is post-dosed into the working fluid at 0.02–0.10 wt% as a dilute mineral-oil dispersion rather than added directly as 100% active compound, because direct addition can create local hydrophobic films on filter media. The post-dose point is positioned upstream of the tramp oil skimmer and downstream of the mixing eductor to avoid silicone depletion by coalescing elements. Concentrates are formulated with 0.10–0.50 wt% of the compound and then diluted; dilution-induced pH drift must remain within 8.8–9.4 measured under ISO 4316:1977 potentiometric conditions. Foam performance is assessed by ASTM D892-23 sequence I–III with compressed air at 94 mL/min and a temperature ramp from 24 °C to 93.5 °C; a passing semisynthetic coolant formulated with the compound shows total foam height not exceeding 50 mL after 10 min settling. Published data for some high-hardness central systems is limited, particularly above 400 ppm calcium carbonate, and site-specific validation is required before bulk post-dosing. Terminal products include semisynthetic machining coolants, heavy-duty cutting oils, and wheel-grinding fluids, all of which are filtered through 10 µm cartridge housings before packaging.
During agrochemical suspension concentrate milling, air incorporation begins at the premix stage when technical active ingredients with low bulk density, such as 400 g/L class suspensions, are wetted with nonionic-polymeric dispersant solutions. Foam generated inside a horizontal bead mill containing 0.6–1.2 mm zirconia beads reduces throughput by creating an air cushion that lowers transmitted power draw at constant shaft speed; operators observe chamber pressure fluctuations of ±0.2 bar. Silcolapse 610 is added to the milling slurry at 0.02–0.15 wt%, with the lower half of this range preferred for water-based suspension concentrates and the upper half for non-water oil dispersion formulations where the continuous phase has higher air-carrying capacity. The compound is introduced before the wetting agent reaches its critical micelle concentration to avoid competition at the air/liquid interface. Process control uses CIPAC MT 47.1 for foam height in aqueous pesticide formulations; a lot is considered free of unacceptable foaming when foam volume after 10 inversions is below 10 mL in a 100 mL cylinder. Relevant regulatory files combine EC 1107/2009 plant protection product authorization with REACH registration under (EC) 1907/2006; the compound must not appear in an excluded co-formulant entry under Annex III. Terminal product forms are water-based suspension concentrates, oil dispersions, and wettable granules produced via spray drying, where residual silicone can reduce dusting and help control foam during tank dilution.
Medium-oil alkyd enamel batches that are thinned with white spirit exhibit a different failure pattern: macrofoam is rare, but silicone-induced surface turbulence produces fisheye defects when the compound is added undispersed at levels above 0.25 wt%. For solvent-borne systems, Silcolapse 610 is pre-blended in 10% of the batch white spirit at a ratio of 0.05–0.25 wt% of total enamel mass and then dosed under low-speed agitation during the thixotropic adjustment step. The pre-blend is added after the alkyd resin has been fully solvated at 25–35 °C; addition during pigment dispersion in a horizontal sand mill causes the silicone to coat pigment agglomerates and reduce gloss development. Compliance for industrial and non-industrial solvent-borne coatings in the European Union is established by Directive 2004/42/EC Annex IIB, where white spirit content must not exceed 300 g/L for product subcategory A/d; ISO 11890-2:2020 is used for VOC determination. Gloss retention is monitored by ISO 2813:2014 specular gloss at 20°, 60°, and 85° geometry; a change of more than 5 GU at 60° after silicone addition indicates overdosing or poor droplet comminution. Terminal products include high-gloss alkyd trim enamels, wood varnishes, and anti-corrosion primers for steel and cast iron, where the absence of foam-induced pinholes is verified by ASTM D714-21 blister rating after 72 h humidity exposure.
At temperatures above 60 °C, alkaline CIP make-down tanks containing 2–4% sodium hydroxide and 1–2% gluconate sequestrant produce foam that blocks conductivity probes and reduces spray nozzle impingement pressure to below 1.5 bar in recirculation loops. Silcolapse 610 is incorporated into the concentrated liquid nonionic-anionic blend at 0.10–0.50 wt%, but its retention under continuous alkaline stress depends on the surfactant package: linear fatty alcohol ethoxylates with C12–C14 chain lengths preserve activity better than branched alcohol ethoxylates, while amine oxides above 2 wt% can displace silicone from the air/water interface. The formulating process requires that the compound be post-added after neutralisation at pH 6.5–7.5; for aggressive alkaline concentrates, this step is omitted only when the blend has been pre-mixed with hydrotropes. Foam control is measured using ASTM D1173-07(2019) dynamic foam testing at 25 °C and 60 °C, with a maximum foam height of 5 mm after 5 min circulation for CIP acceptance. The applicable detergents framework is Regulation (EC) No 648/2004; the silicone compound is reported as an organic polymer raw material under that regulation, and the site SDS must reflect any residual D4/D5/D6 content under CLP. Terminal product types include low-foam spray degreasers, bottle-washing additives, and dairy CIP detergents, in which the antifoam must survive repeated heating to 80 °C for 20 min per cleaning cycle. Published data for liquid alkaline concentrates above pH 12.5 is limited, and long-term stability testing is required before bulk production.
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Silcolapse 610 is a 100 % active silicone antifoam compound supplied as an anhydrous, water-insoluble dispersion of silicone fluid and hydrophobized silica. The product is identified by the manufacturer as a non-emulsified compound for foam prevention and foam knockdown in both water and non-water process systems. Because the formulation contains no intentionally added water, glycol, mineral oil carrier, or preservative, the entire delivered mass is active antifoam material. This differentiates it from a 20 % active aqueous silicone emulsion, in which 0.20 kg of active silicone is delivered per 1.00 kg of product and the remaining mass consists of water, emulsifier, and preservative. The 100 % active form reduces shipment volume and eliminates preservative-related microbial growth in the concentrate, but it imposes a dispersion requirement at the point of use.
Incoming quality control should compare the certificate of analysis against the product specification for appearance, nonvolatile content, and rheological behaviour. Visual appearance is commonly an opaque pale grey to off-white viscous fluid or paste; the exact viscosity is non-Newtonian and depends on shear history, temperature, and silica content. The compound is not water-soluble and does not form a stable emulsion without mechanical work. Foam-control performance can be screened using ASTM E2407 in aqueous test media and ASTM D892 in oil-based systems, although neither test substitutes for full production evaluation in the target formulation. Viscosity measurement may follow ISO 3219 or ASTM D2196 when a rotational viscometer is specified by the receiving site.
The antifoam mechanism is interfacial and depends on the ability of the silicone phase to enter and bridge the foam lamella. The dispersed hydrophobic particles create a local surface tension gradient that drains the lamella and releases the entrapped gas. In aqueous systems, the product must first be dispersed as droplets; if added neat as a large mass, it can accumulate in low-flow zones, plate on vessel walls, or create coarse surface patches. In non-water systems, the product is generally added to the continuous phase under low-shear agitation because the silicone is compatible with many hydrocarbon, ester, and organic solvent matrices but is not molecularly soluble in highly polar glycol or water phases.
The replacement decision changes the dosing hardware, the point of addition, and the dispersion strategy. A 20 % active emulsion is a low-viscosity, pumpable liquid that can be metered directly from a drum using a diaphragm or peristaltic pump. The 100 % active compound may require a positive-displacement pump with a fitted drum follower or heated transfer line because viscosity increases materially at low shear. The material’s shear-thinning behaviour means pumpability cannot be inferred from a single low-shear viscosity value; the apparent viscosity should be measured at the actual pump shear rate. In production trials, a gear pump or progressive cavity pump has been used for side-stream dosing, with the compound injected into a circulating bypass loop equipped with a static mixer.
Because the product is not pre-emulsified, the operator controls the dispersed droplet size. A coarse dispersion with a median droplet diameter above 10 µm can provide faster foam knockdown but may separate; a fine pre-emulsion with a median droplet diameter below 2 µm is more stable but may show slower initial foam collapse. Laser diffraction per ISO 13320 is the appropriate measurement method for droplet size distribution. The optimum distribution must be established by correlating droplet size to ASTM E2407 knockdown time because foam behaviour is system-specific and no universal droplet size target applies across all water chemistries.
| Parameter | Silcolapse 610 | 20 % active aqueous silicone emulsion | Mineral oil defoamer |
|---|---|---|---|
| Active content delivered | 100 % | 20 % | Variable, typically 30–100 % |
| Intentionally added water | None | Approximately 80 % | None |
| Preservative required in concentrate | No | Yes | Not usually |
| Self-emulsifying in water | No | Yes | No |
| Freeze–thaw risk in concentrate | Low; viscosity increases | High; emulsion can separate | Low; viscosity increases |
| Typical feed strategy | Pre-dispersion or side-stream injection with static mixer | Direct diaphragm or peristaltic pump | Direct metering or solvent predilution |
When the compound is used in aqueous latex stripping or water-based paint production, the addition point is usually upstream of the high-shear disperser or into the letdown tank under paddle agitation. Adding the neat compound directly into the finished batch can generate visible surface defects because large droplets are not reduced by subsequent mixing. A rotor-stator inline mixer operating at 3 000–8 000 min⁻¹ can generate a pre-emulsion with a narrow droplet distribution, but recirculation time must be limited; over-shearing raises temperature and may reduce the ability of larger droplets to act as defoamers. The optimal mixing time is determined by measuring foam knockdown after each recirculation interval according to ASTM E2407.
In water treatment, the product may be fed as a continuous side-stream at the basin inlet or into the suction side of a recirculation pump. The addition rate is system-specific and should not be transferred from one plant to another without evaluating total organic carbon, suspended solids, and oil–grease limits. The compound contributes a measurable organic load; therefore the discharge permit and the plant’s activated sludge response must be assessed before full-scale use. Published data for this product under municipal wastewater discharge conditions is limited, and dose-response testing in a bench-scale foam column with site-specific water is required.
In gas sweetening and amine units, foaming is a process conflict because amine solutions contain surface-active degradation products and heat-stable salts. A 100 % active silicone antifoam can reduce foam height in the absorber and regenerator, but over-addition can coat heat-exchanger surfaces and reduce mass transfer. The injection point is often the lean amine stream upstream of a static mixer or the suction side of the circulation pump. Dose is established by foaming tests on the actual lean/rich amine samples using a dynamic sparge cell; no universal ppm dose applies. The compound should not be used to mask foaming caused by high chloride or heat-stable salt contamination; the root cause must be treated by amine reclaiming or ion exchange.
The product should be stored in closed, dry vessels at ambient temperature, protected from moisture ingress and direct sunlight. Although the material contains no water and is not subject to freeze–thaw separation in the same way as an aqueous emulsion, low-temperature storage can increase its viscosity and reduce metering accuracy. Before sampling or transfer, the drum contents should be gently homogenized by low-shear circulation or drum agitation; the risk is not sedimenting grit but slow creaming of the dispersed silica within the silicone fluid after prolonged rest. Material that has been partially dispensed should be stored under a dry nitrogen blanket if oxidative stability must be preserved for long-term use, although the silicone backbone is inherently oxidation-resistant under normal storage conditions.
Prediluted water emulsions are not stable unless the operator adds a stabilizer. An unpreserved 1–5 wt% dispersion in water may separate within 24 h; therefore, such dilutions should be prepared just before use or dosed continuously from an agitated day tank. The day tank should be equipped with low-level cut-off and an agitator drive that does not generate excessive foam. The dispersion should be checked for phase separation and redispersed before each shift. In oil-based systems, predilution with a compatible process solvent may be possible, but the final solvent flash point must be retested according to ASTM D93 or ISO 2719 because solvent addition changes the formulated stream’s regulatory classification.
In a production cutting-fluid line, the product’s 100 % active silicone nature is an advantage where water-diluted antifoams would alter the concentrate’s preservative package or reduce the flash point. The compound is added to the oil phase before emulsification in a soluble-oil or semi-synthetic concentrate. The addition point should be after the base oils have been blended and before the emulsifier package is fully sheared; this prevents the antifoam droplets from being over-dispersed by the later high-shear emulsification stage. The target concentration is system-dependent and must be validated in the final diluted fluid at the intended use concentration using foaming tests under representative aeration.
In high-pressure filtration, air entrainment in the cutting fluid can reduce pump efficiency and create false filter-blockage readings. A suitably dispersed silicone antifoam reduces foam in the reservoir but can also influence surface wettability and filter cake formation. Production trials should measure not only foam height but also chip settling, filter pressure drop, and post-machining residue on parts. The residue evaluation is critical because silicone antifoams can be more persistent on metal surfaces than mineral oil defoamers. Residue can be measured by weight loss on a heated panel after a standard dip test or by surface energy measurement using contact angle per ISO 19403-2. If residue exceeds the customer’s acceptance limit, the dose must be reduced or the addition point moved further upstream.
Compared with a polyalkylene glycol defoamer, the silicone compound operates primarily by film destabilization rather than by changing bulk solubility at a specific cloud point. Polyglycol defoamers change behaviour with temperature and can interact with the surfactant system; direct substitution is therefore not an equal-mass exchange. The correct approach is to reformulate from a clean baseline, compare foam knockdown at equal active loading, and confirm that downstream operations such as grinding, honing, and parts cleaning remain unaffected. In many non-water systems, silicone antifoam is selected when high-temperature, high-alkalinity, or severe surfactant loading reduces the persistence of mineral oil defoamers.
Limitations are relevant in film-forming systems. Because the silicone phase is highly surface-active, carryover into a paint, coating, or ink can reduce intercoat adhesion. The standard evaluation is ASTM D3359 cross-cut tape adhesion after full cure; if adhesion loss is observed, the silicone dose should be reduced, the addition point moved earlier in the grind phase, or a less surface-active mineral oil defoamer should be considered. Silicone contamination on substrates can also interfere with subsequent plasma or corona treatment before bonding; surface energy should be checked with dyne solutions according to ISO 8296.
Compatibility with platinum-catalyzed silicone curing systems should be verified separately. Low levels of silicones in production air can inhibit hydrosilylation reactions, although the degree of inhibition depends on the volatile siloxane content of the antifoam and the catalyst temperature. The product is a nonvolatile silicone compound, but if it is used near a platinum-catalyzed coating line, a plant-specific cross-contamination risk assessment is required. Published data for this product under platinum-catalyzed curing conditions is limited.
Regulatory acceptance must be confirmed against the formulation and the intended market. For food-contact incidental applications, the user must verify the specific component against 21 CFR 176.170 and 21 CFR 176.180 or relevant regional legislation; the product data sheet does not constitute a self-certification. For European industrial use, a REACH safety data sheet should be reviewed for exposure scenarios. For cleaning-in-place operations, the product is not designed as a CIP additive and should not be introduced into circulation when the system is running hot acid or oxidizer washes unless explicit compatibility data exist.
