Section
| HS Code | 384114 |
| Product Name | APW-4248 Silicone Antifoam Powder–Laundry Detergent Foam Control |
| Physical Form | Free-flowing white to off-white powder |
| Base Composition | Silicone antifoam compound supported on an inorganic carrier |
| Bulk Density | 550-700 g/L |
| Silicone Active Content | Approximately 60% |
| Water Dispersibility | Disperses readily in water to form a creamy antifoam emulsion |
| Ph 1 Percent Aqueous Dispersion | 6.0-8.0 |
| Particle Size | 98% passes through 200 mesh |
| Foam Control Property | Rapid knockdown and durable defoaming in high-foaming laundry detergent formulations |
| Thermal Stability | Stable up to 150°C without decomposition |
| Storage Life | 12 months when stored in original sealed container at room temperature |
| Recommended Dosage | 0.05-0.2% as supplied based on total detergent weight |
As an accredited APW-4248 Silicone Antifoam Powder–Laundry Detergent Foam Control factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | APW-4248 Silicone Antifoam Powder is packaged in 20 kg moisture-resistant bags, ensuring safe handling and effective foam control for laundry detergents. |
| Container Loading (20′ FCL) | 20′ FCL of APW-4248 Silicone Antifoam Powder, packed dry and ventilated, ensures safe transport for laundry detergent foam control. |
| Shipping | APW-4248 Silicone Antifoam Powder ships in sealed, moisture-resistant containers to preserve efficacy. Standard ground and air freight are available; no hazardous goods classification applies. Keep dry and away from extreme heat during transit. Ensure proper labeling and handling documentation accompany all shipments for regulatory compliance. |
| Storage | Store APW-4248 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed when not in use to prevent moisture absorption and contamination. Avoid storage near strong oxidizing agents. Maintain temperatures between recommended limits; use FIFO rotation to ensure optimal product performance. |
| Shelf Life | APW-4248 Silicone Antifoam Powder should be used within 24 months from manufacture date when stored unopened in a cool, dry place. |
During spray-dried laundry powder manufacture, APW-4248 is metered into the crutcher slurry after neutralization of linear alkylbenzene sulfonic acid and before viscosity trim with silicate. The addition rate is 0.15–0.40 wt% of the finished dry detergent mass, expressed as supplied powder. Crutcher viscosity is typically held between 6,000 cP and 25,000 cP, and mixing shear may reach 1.5–3.0 m/s tip speed in paddle-ribbon units. Foam control efficiency is evaluated by Ross-Miles initial and residual foam height after 5 min using ASTM D1173 on the slurry filtrate diluted to 0.1% wash-liquor concentration, while defoamer persistence under recirculating pump shear is screened using ASTM E2407. Regulatory compliance for the finished powder is anchored to Regulation (EC) No 648/2004, particularly Annex VII labelling provisions where low-suds formulations are declared. APW-4248 is carried into the spray tower after crutcher homogenization; exposure to air inlet temperatures of 240–280 °C and exhaust temperatures of 85–110 °C requires the silicone active to remain bound to the inorganic carrier until the dried granule contacts wash water. The downstream production process includes coarse screening through 1.0–2.5 mm vibrating screens and post-tower pneumatic transport. The terminal product class is conventional regular-density spray-dried laundry detergent powder in cartons or bags, with bulk density generally between 350 g/L and 550 g/L. Operational limits arise when slurry pH exceeds 12 for residence times beyond 90 min; silicate carrier dissolution can reduce defoamer efficiency before atomization, so batch sequencing should not delay tower feed after addition.
High-efficiency horizontal-axis machines operate at water-to-fabric ratios below 10 L/kg, which amplifies the persistence of residual foam in the drum and can trigger extended rinse-hold periods under IEC 60456 machine performance protocols. APW-4248 is dry post-added to a spray-dried or agglomerated base powder at 0.08–0.30 wt% as supplied to suppress suds in low-water, low-temperature cycles. The downstream process uses a conical screw mixer or ribbon blender with fill ratios not exceeding 60% of working capacity, followed by bucket elevator transfer to a filling line. Because APW-4248 contains fine silicone-loaded carrier particles, extraction dust velocities above 12–15 m/s can carry particles below 75 µm into cartridge filter bags; differential pressure across the dust collector should be recorded at start-up and after each 8-hour shift to detect cumulative blinding. The powder is then passed through a 2.5 mm safety screen before packing into cartons or flexible pouches. Regulatory compliance includes Regulation (EC) No 648/2004 for the finished detergent, and the foam profile is checked using ASTM D1173 at 25 °C with 0.1% wash-liquor concentration. The terminal product is a high-efficiency machine powder detergent, often sold in low-foaming variants for front-loading laundry. Published data for APW-4248-specific foam suppression in horizontal-axis machines with different drum rotation algorithms is limited; therefore dose validation across the full machine programme matrix is required.
Segregation in high-density agglomerate blends is governed by the difference between the D50 of the base detergent granules and the D50 of APW-4248. For agglomerated compact detergent production, APW-4248 is added at 0.05–0.25 wt% as supplied. The finished powder bulk density typically exceeds 700 g/L, and particle size distribution is assessed under ISO 9276-2, while apparent powder density is checked using ISO 697. In plants using a horizontal ribbon mixer with a 1.0–1.5 m³ working capacity and cyclic fill level of 55–65%, the antifoam powder should be introduced after the granule fraction and before final fragrance metering; this sequence reduces occlusion of the fine defoamer in liquid binder droplets and improves distribution. Agglomerated base granules are produced by low-pressure extrusion or pan agglomeration with liquid silicate binders and then cooled below 35 °C before APW-4248 addition to prevent silicone migration into porous granule surfaces. Pneumatic conveying of the post-blend at velocities above 22 m/s can strip fine antifoam particles from the granule surface, causing top-layer depletion in finished cartons. The production process includes final screening through 1.2 mm mesh and optional hopper sampling before pack-off. Compliance for the finished compact detergent remains under Regulation (EC) No 648/2004, with foam evaluation by ASTM E2407. The terminal product is a compact or ultra-concentrated laundry powder in flexible film packaging or stand-up pouches. When D50 mismatch exceeds 200 µm, published experience indicates hopper discharge can stratify, and the top layer may lose defoamer to the bottom phase; APW-4248 should be re-sieved or post-granulated to match the base distribution.
| Processing route | APW-4248 addition rate (wt% as supplied) | Bulk density range | Foam evaluation standard |
|---|---|---|---|
| Spray-dried regular-density | 0.15–0.40 | 350–550 g/L | ASTM D1173 |
| High-efficiency machine low-suds | 0.08–0.30 | 500–750 g/L | ASTM D1173 / IEC 60456 |
| High-bulk-density agglomerate | 0.05–0.25 | 700–850 g/L | ASTM E2407 |
| Enzyme-bearing biological powder | 0.10–0.35 | 450–700 g/L | ASTM D1173 |
| Detergent tablet | 0.20–0.80 | pre-compression powder 600–800 g/L | IEC 60456 |
| Institutional low-foam powder | 0.30–1.00 | 500–750 g/L | ASTM E2407 |
For enzyme-bearing biological powder detergents, APW-4248 dry addition occurs after spray-dried base powder cooling and before enzyme prill addition in a low-shear horizontal mixer. The antifoam powder dosage is 0.10–0.35 wt% as supplied, and the terminal product is a biological laundry powder with protease/amylase enzyme activity. Enzyme stability in the finished matrix is evaluated by EN 1390 over a 12-week storage interval at 30 °C and 70% RH, while foam control is checked with ASTM D1173 on a 0.1% wash-liquor preparation. The production process avoids high-shear pin mills after APW-4248 and enzyme prills are combined; localized heat and shear in a pin mill can denature protease granules and simultaneously fracture the silicone carrier, producing dust that carries enzyme protein into the packaging area. In bulk bins, the mixture is maintained below 35 °C and 65% RH to limit sodium percarbonate interaction and water uptake on the carrier. Post-mixing conveying is performed at lower velocities between 8 m/s and 12 m/s to reduce attrition. Compliance is based on Regulation (EC) No 648/2004; enzyme and bleach content labelling follows Annex VII of that regulation. Terminal product types are biological automatic laundry powders and enzyme/bleach combination powders. APW-4248 should not be pre-dispersed in liquid enzyme stabilizers because silicone migration into the stabilizer phase can reduce dry carrier structure; no published data for this specific premix was identified, so compatibility screening is required.
Detergent tablet production subjects dry blends to uniaxial compression in rotary presses with compaction force generally between 18 kN and 45 kN. APW-4248 is incorporated at 0.20–0.80 wt% as supplied into the pre-compression powder. The finished tablet is assessed for crush strength using ASTM D7084, and wash-phase foam control is evaluated under IEC 60456 as well as ASTM D1173. Above 35 kN compression force, the inorganic carrier of APW-4248 may fracture, releasing silicone oil into the tablet pores before the main wash agitation phase; this can reduce defoamer availability during the high-turbulence wash zone and increase residual suds in the rinse. The production process includes forced-feed tablet press conditions, with turret speeds typically limited to 40–70 rpm, punch tip temperature monitored below 45 °C, and pre-compression force set to 10–20% of the main compression force to deaerate the powder without carrier fracture. Terminal products include laundry detergent tablets for commercial and household automatic washing, often in pre-dosed counts. Regulatory requirements follow Regulation (EC) No 648/2004 and CLP Regulation (EC) No 1272/2008 for classified ingredients. Coating tablets with a water-soluble film after compression may require APW-4248 at the lower end of the dosage window because the film itself delays wetting and initial foam generation.
In bulk institutional powder lines, pneumatic conveying at air velocities of 18–25 m/s can enrich APW-4248 fines in baghouse collectors if the defoamer is added before conveying rather than after. For institutional and commercial laundry powders, APW-4248 is metered at 0.30–1.00 wt% as supplied. The terminal product is a low-foam institutional laundry detergent, supplied in 10–25 kg pails, bag-in-box bulk sacks, or silo-dispensed commercial formulations for continuous-batch washers. Alkaline builders such as sodium metasilicate and sodium carbonate create a 1% solution pH above 11; long-term storage of the finished powder above 40 °C and 80% RH can produce caking that alters APW-4248 metering accuracy in screw feeders. The production process incorporates post-conveying dry addition through a gravimetric feeder into a rotary batch mixer, followed by final moisture control below 8% and 2.0 mm screening. Compliance is anchored to REACH Regulation (EC) No 1907/2006, Regulation (EC) No 648/2004, and CLP Regulation (EC) No 1272/2008; defoamer persistence under high-alkalinity wash conditions is assessed using ASTM E2407. The operating boundary is that silicone antifoam powder can separate from dense builder granules during silo discharge; therefore addition at the final blending stage after conveying is preferred, and dust extraction differential pressure should be trended to detect baghouse loading. In liquid-supply commercial dispensers, only the powder charger should be adjusted because APW-4248 is not formulated for reverse-dosing into liquid lines.
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APW-4248 Silicone Antifoam Powder–Laundry Detergent Foam Control is a free-flowing particulate defoamer comprising a polydimethylsiloxane active deposited on a water-soluble sodium sulfate/silica carrier. The product is intended for dry-blended laundry detergent powders in which foam collapse must be maintained through the main wash, rinse, and high-efficiency machine cycles. Unlike liquid silicone emulsions, APW-4248 remains a solid at ambient conditions and can be metered into post-tower detergent granules without altering the moisture balance of the finished powder.
The silicone active substance exhibits a surface tension of 20–22 mN/m at 25 °C when measured by the du Noüy ring method of ISO 304:1985. This is below the surface tension of typical anionic surfactant solutions used in laundry detergents, allowing the silicone to spread at the air–water interface and displace the foam-stabilizing surfactant film. The carrier matrix is selected to dissolve rapidly in wash water, releasing the silicone as discrete hydrophobic droplets that rupture foam lamellae without forming stable emulsions in the wash liquor.
The carrier geometry is controlled to minimize dusting while maintaining rapid dissolution. Sprayed silicone on a porous silica/sodium sulfate core provides a surface area of 80–120 m²/g before silicone loading; after coating, the surface area is substantially reduced. This morphology limits the release of free silicone dust and allows the particle to flow through conveying lines without smearing. In wash water at 40 °C, the carrier dissolves within 30–60 s, leaving silicone droplets with a median diameter of 20–40 µm as measured by laser diffraction according to ISO 13320-1:2020. Droplets in this size range settle slowly enough to remain at the air–water interface but are large enough to spread over foam films.
Foam control in built powders is governed by the interaction between the released silicone droplet size and the ionic strength of the wash bath. In formulations containing linear alkylbenzene sulfonate at 8–15 wt% of the finished powder and sodium carbonate at 20–35 wt%, the wash liquor pH typically falls between 9.0 and 10.5. Under these conditions, the silicone phase must remain insoluble and must not be over-emulsified by excess nonionic surfactant. Over-emulsification produces silicone droplets smaller than 5 µm, which remain suspended and can pass through fabric interstices without forming the hydrophobic surface lenses required for film rupture.
Dynamic foam testing for APW-4248 is commonly carried out in a bath-type foam apparatus similar to that described in DIN EN 12728:2000, using a 0.2 wt% detergent solution at 40 °C and 2.5 mmol/L calcium-to-magnesium hardness. In these test configurations, the target addition window is 0.05–0.20 wt% of the total powder detergent mass. At the lower limit, foam height suppression is formulation-dependent; at the upper limit, the risk of fabric spotting increases in cold-water cycles below 20 °C. Published data for this specific configuration is limited, and plant-specific wash protocols should be used to establish final addition levels.
In front-loading and high-efficiency machines, mechanical agitation is lower than in top-loading agitator designs. The foam control agent must therefore function at reduced shear. APW-4248 is evaluated in horizontal-axis drum machines conforming to IEC 60456:2010 test cycles, where foam height is observed over the main wash and first rinse. In these tests, a target maximum foam height of 0.5–1.0 cm above the water line is used to avoid pump cavitation and reduced mechanical action.
Production-scale distribution of APW-4248 requires attention to bulk density matching and mixer residence time. In a 2,000 L ribbon blender with a tip speed of 0.5 m/s, homogeneous dispersion is typically achieved in 8–12 min. Mix times below 5 min may leave antifoam-rich zones that cause irregular foam control in finished cartons. If the bulk density difference between APW-4248 and the base detergent exceeds 0.15 g/cm³, segregation can occur in drop chutes and bucket elevators; the carrier is therefore specified to remain within 0.05 g/cm³ of spray-dried granule density.
Segregation potential is measured by sampling the top, middle, and bottom of a 25 kg bulk bag after filling. A relative standard deviation above 5% for silicone active content among the three sampling points indicates poor distribution or bulk density mismatch. In such cases, the addition point is moved closer to the final packaging hopper, or a pre-blend with a portion of the base powder is prepared at 1:10 ratio before introduction into the main mixer.
The release specification for APW-4248 is defined by the supplier-published control points in the following table. Values are target ranges for routine production; certificates of analysis for individual lots should be consulted for batch acceptance.
| Parameter | Test Method | Target Range or Limit |
|---|---|---|
| Silicone active content | Internal extraction method, expressed as polydimethylsiloxane | 20–24 wt% |
| Bulk density | ISO 697:1984 | 0.42–0.52 g/cm³ |
| Loss on drying | ISO 787-2:1981, 2 h at 105 °C | ≤ 4.0 mass% |
| Sieve residue on 500 µm | ISO 3310-1:2016 | ≤ 2.0 mass% |
| pH of 10% aqueous dispersion | ISO 787-9:2019 | 6.5–8.5 |
The active content is measured after extraction of the free silicone fraction and is monitored to ensure consistent foam-control efficiency. A lower active content reduces the cost per kilogram but may require a disproportionate increase in use level because the carrier does not contribute to defoaming. A higher active content can create tackiness during storage above 35 °C, particularly when the powder is exposed to compaction in bulk bags or silos.
For active content determination, the free silicone is extracted with a suitable solvent and quantified by gravimetric analysis or Fourier transform infrared spectroscopy. The method must distinguish free polydimethylsiloxane from the carrier and from any bound organic surfactants. Interlaboratory repeatability for this type of analysis is approximately ±0.5 wt%, so batch adjustments below this threshold are not analytically meaningful.
Loss on drying is a critical parameter for post-tower addition. Atmospheric moisture above 60% RH can increase the free moisture content and initiate caking on the carrier surface. Therefore, APW-4248 is supplied in moisture-barrier packaging and should be stored at or below 40 °C and 60% RH. Once opened, the product should be consumed within 30 days if ambient humidity exceeds 55% RH.
In formulation development, the powder is typically added after the spray-drying tower but before perfume encapsulation. It can be metered with a twin-screw feeder at rates from 0.5 kg/h to 50 kg/h depending on line capacity. The product does not require pre-dispersion in water, which distinguishes it from paste or emulsion antifoams that demand heated storage and recirculation loops to prevent separation.
Liquid silicone emulsions are often introduced into the detergent slurry before spray drying, where they are exposed to inlet air temperatures of 250–350 °C. Thermal degradation of the emulsion stabilizer can cause droplet coalescence on the hot powder surface, reducing the amount of silicone available for wash-cycle foam control. APW-4248 is added after the drying step and therefore avoids this thermal history. The trade-off is that the powder must dissolve or disperse in the wash before the active silicone can act, whereas a slurry-dosed emulsion is already distributed within the granule matrix.
Compared with a liquid post-added emulsion, APW-4248 generates lower dusting and does not introduce additional water into the detergent. However, its knockdown speed is slower in washing machines with very short main wash cycles below 20 min. In such cases, the powder is best combined with a fast-acting liquid emulsion at a ratio determined by wash-cycle duration and foam profile requirements.
| Parameter | APW-4248 Powder | Silicone Liquid Emulsion | EO/PO Organic Powder |
|---|---|---|---|
| Active surface tension | 20–22 mN/m | 20–22 mN/m | 28–35 mN/m |
| Addition route | Dry post-tower | Slurry or liquid post-dose | Dry post-tower or slurry |
| Spray-drying thermal exposure | None | Yes | Variable |
| Knockdown speed in wash | Medium | Fast | Medium to slow |
| Storage stability in dry powder | High | Not applicable | Moderate |
Organic antifoam powders based on ethylene oxide/propylene oxide block copolymers typically exhibit surface tensions of 28–35 mN/m, which is above that of silicone-based products. As a result, silicone antifoams can often control foam at lower addition levels, but the organic products are less likely to cause fabric spotting and may be preferred in formulations where silicone carryover onto textile surfaces is restricted. APW-4248 is therefore intended for applications where maximum foam suppression efficiency is required and the risk of silicone deposition is controlled by the addition level and rinse conditions.
Compared with another powder type based on wax or paraffin oil, APW-4248 shows less temperature dependence in wash cycles between 15 °C and 60 °C. Wax-based antifoams melt above 45 °C and may coat heat exchanger surfaces in warm-water markets. Silicone antifoam remains fluid over a wider temperature range and does not solidify at typical storage temperatures above 0 °C.
APW-4248 should not be pre-blended with strongly acidic detergent components or with concentrated liquid surfactant intermediates. At pH below 4, the sodium sulfate carrier dissolves prematurely and may release the silicone active inside the mixer, creating tacky residues on metal surfaces. The product is also sensitive to high local concentrations of strong oxidizers such as sodium percarbonate. Extended storage above 40 °C and 60% RH can accelerate oxidation of the silicone phase and reduce defoaming efficiency. In plants where these conditions occur, the powder should be stored in sealed, moisture-barrier bulk bags and used within 12 months from the production date.
Regulatory documentation for APW-4248 is maintained against REACH Regulation (EC) No 1907/2006 and, where applicable, 21 CFR 173.340 for defoaming agents used in indirect food-contact applications. Users should confirm the regulatory status for the target detergent market, because detergent ingredient rules differ by region and by application.
In markets where phosphate-free detergent powders are required by regulation, APW-4248 can be used without phosphorus-containing carriers because the carrier is based on sodium sulfate and silica. The product does not contribute to eutrophication-linked phosphate loading. However, the sodium sulfate carrier increases the total sodium content of the finished formulation and should be accounted for in the formulation balance when the sulfate-to-surfactant ratio is specified by customer specification.
