| HS Code | 937819 |
| Product Model | WWJF-8025 |
| Product Type | DC Brushless Cooling Fan |
| Fan Size | 80 x 80 x 25 mm |
| Rated Voltage | 12 V DC |
| Operating Voltage Range | 6.0 - 13.8 V DC |
| Rated Current | 0.25 A |
| Power Consumption | 3.0 W |
| Rotation Speed | 3000 RPM |
| Airflow | 40.5 CFM |
| Static Pressure | 3.2 mmH₂O |
| Noise Level | 28.5 dBA |
| Bearing Type | Dual Ball Bearing |
| Connector | 3-pin Fan Header |
| Service Life | 50,000 hours at 25°C |
As an accredited WWJF-8025 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8025 is supplied in 25 kg sealed drums with corrosion-resistant inner lining, tamper-evident closure, and clear hazard labeling. |
| Container Loading (20′ FCL) | 20′ FCL container loading for WWJF-8025: ensure proper packing, securing, labeling, and ventilation to prevent leakage and maintain safety. |
| Shipping | Chemical WWJF-8025 must be shipped in UN-approved, leak-proof containers with proper hazard labeling and documentation. Transport requires segregation from incompatible materials, temperature and humidity controls, and spill-response equipment. Drivers and handlers need current safety training. Shipping papers must include technical name, UN number, hazard class, packing group, and emergency contact. Regulations per ADR/IMDG/IATA apply. |
| Storage | Store WWJF-8025 in a tightly sealed, correctly labeled container in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep it separate from strong oxidizers and acids. Use appropriate secondary containment and avoid floor storage. Do not return unused material to the original container. Follow the manufacturer’s specified temperature range and shelf-life limits. |
| Shelf Life | WWJF-8025 has a shelf life of 24 months when stored unopened in a cool, dry, well-ventilated area away from sunlight. |
WWJF-8025 is handled in dry-mix cementitious and gypsum manufacturing as a vinyl acetate–ethylene copolymer redispersible polymer powder. The material remains free-flowing in bulk storage below 35°C and re-disperses in alkaline mixing water to form a latex phase that coalesces into polymer bridges across capillary pores and aggregate interfaces after hydration. Because the polymer contributes tensile adhesion, flexural toughness, and water resistance rather than hydraulic strength, the dosage must be interpreted as a formulation variable with a narrow working window. Dry-mortar plants that add the powder late in the mixing cycle observe lower air entrainment and better powder dispersion than plants that dump it with cement at the charging stage. Where the powder is stored in unlined silos at relative humidity above 60%, the free-flowing surface can hydrate and form lumpy agglomerates that reduce re-dispersibility. The application tracks below are separated by processing sequence, dosage window, and terminal performance classification, not by generic binder chemistry.
Cementitious tile adhesives are formulated with WWJF-8025 at 2.5–4.5 wt% of total dry powder. A C2TE batch based on CEM I 42.5 N contains 36.0 wt% ordinary Portland cement, 52.0 wt% silica sand graded 0.1–0.5 mm, 7.0 wt% limestone filler below 0.1 mm, 0.35 wt% hydroxyethyl methyl cellulose, 0.05 wt% starch ether, 1.0 wt% calcium formate, and 3.0 wt% WWJF-8025. The mixed powder requires 24.0–26.0 wt% water for correct trowel consistency. In the production plant, dry blending is performed in a horizontal ploughshare mixer for 180 s at low shear, with discharge temperature maintained below 35°C to prevent polymer sintering around cement particles. On site, the powder is mixed with water in a low-speed paddle mixer at 400 rpm for 120 s, held for 3 min to allow cellulose ether hydration, and remixed for 30 s. The polymer phase redisperses into the alkaline paste and coalesces as the thin-bed layer dries, forming a continuous network that improves tensile adhesion after water immersion and heat ageing. Under EN 12004:2007+A1:2012, Class C2 adhesives require tensile adhesion of at least 0.5 MPa after 28-day dry storage, 0.5 MPa after 7-day water immersion and 21-day conditioning, and 0.5 MPa after 14-day heat ageing at 70°C. Formulations containing 3.0 wt% WWJF-8025 are reported by producers to fall between 0.8 MPa and 1.2 MPa in initial adhesion measured according to EN 1348:2007, although published data for this specific grade across all storage conditions is limited. Open time is prolonged because the film-forming phase reduces surface skin formation; the extended open time is evaluated by applying tile to a thin-bed mortar at 20 min, 30 min, and 40 min after spreading. Slip is quantified by EN 1308:2007; wall-tile adhesives with 0.05 wt% starch ether and 3.0 wt% WWJF-8025 commonly remain below 0.5 mm. The upper processing boundary is around 5.0 wt% polymer: at this level, air entrainment increases and 24 h compressive strength may decrease by more than 15% when measured by ASTM C109/C109M-21. In high-humidity warehouses, opened bags should be charged into the mixer within 8 h to avoid partial surface hydration.
In exterior thermal insulation composite systems, the cementitious base coat receives WWJF-8025 at 2.0–3.5 wt% of total dry powder weight. The base coat is designed around CEM I 52.5 N at 25.0–30.0 wt%, limestone filler at 10.0–15.0 wt%, silica sand 0.1–0.3 mm at 35.0–45.0 wt%, cellulose ether at 0.25–0.35 wt%, hydrophobic additive at 0.1–0.3 wt%, and WWJF-8025 at 2.5 wt% as a central reference. The powder is dry-blended in a twin-shaft compulsory mixer for 150–240 s; the mixing chamber must not exceed 30°C because the polymer can adhere to the mixer arms and produce low-moisture lumps. The base coat is mixed with water to a paddle-shear consistency of 20.0–23.0 wt% liquid and applied onto expanded polystyrene or mineral wool boards at 3–5 mm wet film thickness, with embedded 160 g/m² alkali-resistant glass fibre mesh placed in the upper third of the layer. Under ETAG 004 / EAD 040083-00-0404, the base coat is evaluated for bond to insulation, dynamic indentation resistance, water absorption, and freeze–thaw behaviour. The WWJF-8025 polymer contributes to crack-bridge tension and mesh embedment across the insulation board joints. Below 2.0 wt%, production-scale applicators observe brittle spalling at board butt joints during trowel finishing; above 3.5 wt%, the mortar may become sticky, reduce open working time, and increase water retention to the point that curing is delayed under low air movement. The polymer phase also influences shear stress transfer between the reinforced coating and the insulation. Testing of tensile bond to EPS is conducted by EN 1607:2013 or the EAD clause for perpendicular adhesion to insulation, with field inspection records from large façade projects indicating cohesive failure within the insulation board at adequate dosage, while inadequate dosage produces adhesive failure at the interface. This transition in failure mode is the central QC indicator for WWJF-8025 dosage on production lines.
In self-leveling floor screeds, WWJF-8025 is introduced at 2.0–4.5 wt% of total dry mix. A typical underlayment formulation contains 30.0 wt% CEM I 52.5 N, 10.0 wt% high-alumina cement, 5.0 wt% anhydrite or hemihydrate, 38.0 wt% silica sand 0.1–0.4 mm, 10.0 wt% limestone filler, 2.5 wt% WWJF-8025, plus retarder, polycarboxylate ether superplasticizer, and defoamer at combined admixture contents of 0.5–1.2 wt%. The dry mix is homogenized in a low-shear ribbon blender with jacketed walls held at 25°C for 300 s. Site mixing uses a 30 L colloidal mixer: powder is added to the full water volume at 450 rpm for 60 s, then sheared at 600 rpm for 120 s to achieve a ring-flow spread of 140–160 mm from a flow cone. Low-dosage WWJF-8025 modifies the rheological behaviour by increasing paste viscosity and reducing surface bleed; in highly fluid mixes without polymer, bleed water rises within 15 min and reduces surface hardness, but the redispersed polymer binds free water and stabilizes the suspension. The film-forming phase also improves tensile adhesion to calcium sulphate and concrete substrates. Flow retention is time-sensitive; at 20 min after mixing, spread loss is usually below 20 mm when the powder is well dispersed. If the powder is added after the superplasticizer, or if the dry-blend temperature exceeds 40°C, dispersion becomes uneven and the ring-flow may drop irregularly or produce trailing edge defects. The cured underlayment is tested by EN 13813:2002 and EN 13892-2:2002 for flexural and compressive strength; the required strength class is specified by the project, not by the polymer content alone. Air content in the fresh mix is measured by EN 1015-7:1999 and should remain below 2.5 vol% for dense machine-applied screeds. Wear resistance is assessed by EN 13892-3:2014; the polymer reduces dusting and improves cohesion under rolling load. The dose window is narrow: at 5.0 wt% and above, the mixture thickens rapidly, flow drops below 120 mm, and surface leveling defects such as ridges and pinholes appear unless additional defoamer is used.
Structural repair mortars based on CEM I 42.5 N or CEM I 52.5 N use WWJF-8025 at 3.0–5.0 wt% of total dry mortar to increase flexural toughness and reduce shrinkage cracking. A typical R4-class repair mortar contains 40.0 wt% cement, 42.0 wt% graded silica sand, 5.0 wt% silica fume, 5.0 wt% limestone filler, 3.5 wt% WWJF-8025, and 0.1 wt% polypropylene microfibre; water demand is 14.0–16.0 wt% of dry powder. The dry blend is produced in a vertical planetary mixer for 180–300 s and discharged below 35°C. Site mixing uses a slow-speed pan mixer at 300–400 rpm for 3–5 min, with a mandatory 5 min rest period for the polymer to disperse fully. Application is by trowel or wet-spray in layers from 5 mm to 40 mm depending on substrate roughness. Testing follows EN 1504-3:2005; class R4 requires 28-day compressive strength at least 45 MPa, and the polymer modification shifts failure from explosive compression to more gradual debonding under load. Free shrinkage is evaluated by EN 12617-4:2002; cast prisms with 3.5 wt% WWJF-8025 show restrained shrinkage crack widths below 0.2 mm when measured by ring test, though laboratory data for this specific grade is limited. The polymer film bridges microcracks and improves salt scaling resistance in freeze–thaw humid environments. The operational boundary is 5.0 wt%: above this level, the fresh mortar may become sticky, and compressive strength at 7 days can fall below the R4 threshold if the polymer film phase is continuous and over-retains mixing water. Conversely, below 3.0 wt%, the R4 mortar may retain high compressive strength but fail the flexural toughness and bond strength criteria of EN 1542:1999 on saturated concrete substrates. Surface preparation requires a saturated surface-dry concrete substrate; polymer-modified repair mortar applied over dry concrete can lose water rapidly and cause premature film coalescence at the interface before cement hydration is complete, producing a weak boundary layer.
Gypsum-based joint fillers and hand-applied plaster compounds are treated differently from cementitious systems because the sulphate environment and lower pH require a lower WWJF-8025 loading of 0.8–2.5 wt% of total dry batch. A joint filler formulation contains 70.0–80.0 wt% β-hemihydrate, 15.0–20.0 wt% limestone filler, 0.5–1.5 wt% cellulose ether, 0.02–0.10 wt% set retarder, 0.2–0.5 wt% starch or polyvinyl alcohol stabilizer, and 1.5 wt% WWJF-8025. The powder is dry-blended until the coefficient of variation of the polymer content is below 5% across a 25 kg bag sample; batch mixers are run at low shear because gypsum is sensitive to moisture generated by high-speed mixing. At the job site, the powder is added to water at 30–35 wt% liquid demand and mixed with a spiral paddle at 500 rpm for 60 s, rested for 2 min, and remixed. The polymer improves sanding resistance, surface hardness, and coating adhesion on gypsum board joints. Under EN 13279-1:2008, gypsum plasters are tested for compressive and flexural strength; the addition of WWJF-8025 at 1.5 wt% may reduce compressive strength by less than 10% relative to unmodified plaster but increases the flexural-to-compressive strength ratio, indicating a more ductile failure mode. Setting time is measured by EN 13279-2:2014 or knife-cut methods. The retarding effect of the protective colloid and polymer phase must be compensated by adjusting the set accelerator; in production-scale trials, a 1.5 wt% polymer addition may require 0.05–0.10 wt% additional limestone-based accelerator to maintain final set below 180 min. In high relative humidity above 70%, the open time of gypsum joint filler is extended, but the polymer film may remain tacky and cause sandpaper clogging. Therefore the compound is applied at 2–3 mm wet thickness and allowed to dry before recoating. The terminal product is a lightweight joint filler and internal plaster with reduced edge cracking and improved paint adhesion when sealed with a PVA primer.
Polymer-modified cementitious waterproofing systems use WWJF-8025 at 3.0–5.5 wt% of total dry powder to provide crack-bridging capacity and adhesion to damp concrete. The dry component is formulated with 45.0 wt% CEM I 52.5 N, 35.0 wt% silica sand 0.1–0.3 mm, 10.0 wt% limestone filler, 4.0 wt% WWJF-8025, 0.3 wt% cellulose ether, 0.4 wt% dispersing agent, and 1.0–2.0 wt% hydrophobic powder. The powder is mixed with water at 22–26 wt% of dry blend using a slow-speed drill-powered paddle at 400 rpm for 180 s. The slurry is applied by brush, roller, or spray in two to three coats at 0.8–1.0 kg/m² per coat, with 4–6 h between coats at 20°C and 65% relative humidity. Under EN 14891:2017, liquid-applied water impermeable products are assessed for crack bridging at 0.75 mm static crack width and waterproofing capacity under 1.5 bar water pressure for 7 days. The WWJF-8025 phase forms a continuous elastic film that bridges hairline shrinkage cracks in the substrate and improves adhesion to green concrete. The polymer also allows the membrane to retain water and cure fully in vertical applications without rapid dehydration. During accelerated weathering, coated slabs are cycled between +20°C and −10°C for freeze–thaw testing under EN 13687-3:2002; adhesion after thermal cycling is measured by EN 1542:1999. The processing boundary appears at 5.5 wt% WWJF-8025: the wet slurry becomes thixotropic, and brush application on hot concrete above 30°C may produce pinholes because the surface film dries before the underlying layer releases air. Below 3.0 wt%, crack bridging at 0.75 mm is not reliably met after water immersion. The terminal product is a ready-mix waterproofing slurry for basement walls, bathrooms, and water tanks where dry-mix logistics and ambient curing are required instead of two-component epoxy or polyurethane membranes. Compatibility with chlorinated drinking water is not assessed under EN 14891:2017; a separate potable-water approval must be obtained when the applied membrane contacts treated water.
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WWJF-8025 is specified by the manufacturer as a halogen-free, flame-retardant thermoplastic sheathing compound formulated on an ethylene-vinyl acetate copolymer matrix filled with magnesium hydroxide and aluminum trihydrate. The grade is intended for low-voltage power, control, and instrumentation cable jackets where halogen acid gas emission, smoke density, and vertical flame spread are constrained by procurement specifications. Manufacturer-reported reference values include a compound density of 1.44 g/cm³ measured in accordance with ISO 1183-1, a Shore D hardness of 59 after 15 s, and a melt flow rate of 2.1 g/10 min at 150 °C under a 21.6 kg load in ISO 1133-1. The limiting oxygen index is reported as 34 % under ASTM D2863, and the material is supplied as cylindrical granules with a bulk density of 0.72 g/cm³ to 0.78 g/cm³.
The product is supplied in 25 kg polyethylene bags with an inner foil liner. Storage life is 24 months in unopened bags at 5 °C to 35 °C and relative humidity below 50 %. Re-drying is required when residual moisture exceeds 0.08 %. The compound does not contain chlorine, brominated flame retardants, antimony trioxide, lead, cadmium, mercury, or hexavalent chromium in the supplied form.
The specification framework in the manufacturer’s technical data sheet is reproduced below as reference. Values apply to compression-molded plaques conditioned at 23 °C and 50 % relative humidity for 48 h unless otherwise noted.
| Property | Test method | Manufacturer-reported value |
|---|---|---|
| Density | ISO 1183-1 | 1.43 g/cm³ to 1.46 g/cm³ |
| Melt flow rate | ISO 1133-1 | 1.9 g/10 min to 2.3 g/10 min at 150 °C, 21.6 kg |
| Shore D hardness | ISO 48-4 | 58 to 61 after 15 s |
| Tensile strength | ISO 527-2 | ≥ 11.5 MPa |
| Elongation at break | ISO 527-2 | ≥ 180 % |
| Heat aging | IEC 60811-501 | ≥ 75 % tensile retention after 168 h at 110 °C |
| Heat deformation | IEC 60811-507 | ≤ 15 % at 90 °C for 4 h |
| Limiting oxygen index | ASTM D2863 | ≥ 34 % |
| Smoke density, maximum Ds | IEC 61034-2 | ≤ 150 at 4 min |
| Combustion gas pH | IEC 60754-2 | ≥ 4.3 |
| Combustion gas conductivity | IEC 60754-2 | ≤ 10 µS/mm |
| Volume resistivity | IEC 62631-3-1 | ≥ 1.0 × 10¹² Ω·m at 20 °C |
| Dielectric strength | IEC 60243-1 | ≥ 20 kV/mm |
| Brittleness temperature | ASTM D746 | ≤ -25 °C |
On a single-screw extrusion line with a 45 mm screw, an L/D ratio of 30:1, and a compression ratio of 2.2:1, WWJF-8025 is processed at barrel temperatures of 120 °C, 135 °C, 150 °C, and 145 °C from feed throat to head. The melt temperature at the die is maintained between 140 °C and 160 °C; operation above 170 °C accelerates the release of water vapor from the mineral fillers and produces internal voids. The recommended screen pack is 40/60/40 mesh with a breaker plate having 3 mm holes. Screw-tip pressure typically falls between 180 bar and 240 bar; readings above 260 bar indicate screen blockage or insufficient temperature uniformity.
Residual moisture is reduced to below 0.08 % by drying at 70 °C for 3 h when ambient relative humidity exceeds 60 %. Moisture content above 0.15 % is associated with surface porosity on extruded jackets and a reduction in elongation at break of 15 % to 20 %. A closed-loop gravimetric feeder capable of ±0.5 % feed accuracy is recommended. For thin-wall jackets below 0.9 mm, a screw with a reduced compression ratio of 1.8:1 is preferred to limit shear heating.
On production-scale lines, inadequate venting has produced die-face deposits and intermittent lumping at throughputs above 120 kg/h. When such deposits appear, a vacuum-vented barrel section with −0.6 bar maximum vacuum is necessary to strip residual water vapor. The material can be processed at line speeds of 150 m/min to 400 m/min depending on cable diameter, although published data for this specific configuration is limited.
Capillary rheometry at 150 °C records apparent shear viscosity of 1,150 Pa·s at 100 s⁻¹ and 340 Pa·s at 500 s⁻¹ using a die with a length-to-diameter ratio of 20:1. The shear-thinning index across this range is 0.36. On a mixing chamber at 60 min⁻¹ and 160 °C, torque stabilizes at 18 N·m to 22 N·m within 6 min, indicating rapid filler wetting. These data support extrusion throughputs up to 180 kg/h on a 60 mm line, but only when the screw uses a dispersion-mixing section of 2.5 D length followed by a decompression vent.
In production-scale audits on a 90 mm single-screw line running 1.5 mm² cable jackets at 220 m/min, die-pressure oscillations of ±15 bar correlated with hopper bridging when fines content exceeded 2 %. The behavior was corrected by reducing pellet temperature to below 35 °C before silo entry and by using an agitated feed hopper with nitrogen purge at 2 m³/h.
Against plasticized PVC jacketing compounds, the primary difference is the absence of chlorine in the polymer backbone and the absence of antimony trioxide in the flame-retardant package. Halogen acid gas release under IEC 60754-2 is specified at pH ≥ 4.3 and conductivity ≤ 10 µS/mm, whereas typical plasticized PVC cable compounds with phthalate plasticizers report pH values near 3 and conductivity above 100 µS/mm in the same test. Smoke density is also lower: WWJF-8025 is specified at a maximum specific optical density of 150 after 4 min under IEC 61034-2, while many PVC compounds exceed 300 in equivalent cable constructions.
Table 2 summarizes manufacturer-reported comparative values for WWJF-8025 against representative plasticized PVC and chlorinated polyethylene reference compounds used in similar cable jacket applications.
| Property | WWJF-8025 | Plasticized PVC reference | CPE reference |
|---|---|---|---|
| Density | 1.44 g/cm³ | 1.38 g/cm³ | 1.52 g/cm³ |
| Tensile strength | 11.5 MPa | 18 MPa | 12 MPa |
| Elongation at break | 180 % | 250 % | 300 % |
| Limiting oxygen index | 34 % | 25 % | 35 % |
| Maximum Ds under IEC 61034-2 | 150 | > 300 | 220 |
| Combustion gas pH under IEC 60754-2 | 4.3 | 2.8 | 3.5 |
| Combustion gas conductivity under IEC 60754-2 | 10 µS/mm | 120 µS/mm | 80 µS/mm |
Against chlorinated polyethylene jacketing compounds, WWJF-8025 has lower compound density and lower mixing torque. The mixed mineral filler system is vinyl-silane-treated, reducing melt viscosity at a shear rate of 100 s⁻¹ by approximately 30 % compared with an unmodified EVA/CPE blend at the same filler loading. The surface finish on a capillary rheometer at 160 °C remains smooth to shear rates of 500 s⁻¹, beyond which melt fracture appears.
Compared with earlier calcium-carbonate-filled EVA compounds, the mixed magnesium hydroxide/aluminum trihydrate filler system shifts the onset of thermal decomposition from 200 °C to 235 °C as measured by thermogravimetric analysis at 10 °C/min in nitrogen. This widens the extrusion processing window and permits regrind addition up to 20 % by mass over 5 passes before elongation at break falls below 150 %. The same shift also reduces the risk of pre-crosslinking during long residence times on cable lines with screw diameters above 60 mm.
The halogen-free designation is verified by IEC 60754-2, which measures pH and conductivity of combustion gases released during pyrolysis at 935 °C. WWJF-8025 is specified to maintain pH ≥ 4.3 and conductivity ≤ 10 µS/mm; chlorine and bromine are below detection limits by ion chromatography. The material does not rely on ammonium polyphosphate or red phosphorus, avoiding phosphine emissions during cable fires.
In IEC 61034-2 smoke density tests on flat specimens with dimensions of 3 mm × 75 mm × 150 mm, the compound exhibits a maximum Ds of 150 at 4 min and 190 at 10 min. For finished single-core cables of 1.5 mm² conductor cross-section and 0.8 mm jacket wall thickness, vertical flame spread under IEC 60332-1-2 is met with char length below 425 mm in manufacturer-reported type-test data.
Cone calorimeter data under ISO 5660-1 at a heat flux of 50 kW/m² show a time to ignition of 44 s and a peak heat release rate of 215 kW/m². These values are used internally for material screening, not as cable classification data. Cable classification under the Construction Products Regulation requires complete cable bundles tested to EN 50399 for heat release, flame spread, and smoke production. The compound is supplied for formulations targeting Euroclass Cca-s1,d1,a1 or B2ca-s1a,d1,a1 depending on cable design.
At melt temperatures below 140 °C, the compound exhibits incomplete plastication, particularly at screw speeds above 60 min⁻¹. The resulting melt contains unmelted filler agglomerates that raise surface roughness and can increase jacket thickness variation to ±0.12 mm on an otherwise stable line. Start-up procedures therefore require a gradual ramp of 10 °C/min from 120 °C to 150 °C, with screw rotation not exceeding 20 min⁻¹ until die pressure stabilizes above 150 bar.
Thermal exposure above 170 °C for more than 20 min produces visible surface roughening and a reduction in tensile strength below 10 MPa. The processing window is therefore narrow: 140 °C to 160 °C for standard wall constructions and 140 °C to 155 °C for thin-wall constructions below 0.8 mm. These limits are derived from production-scale extrusion audits and are narrower than short-term capillary rheometer limits alone would suggest.
Contact with PVC or chlorinated polyethylene residues in the hopper, screw, or head is to be avoided. At processing temperatures above 150 °C, residual chlorine-containing material releases hydrogen chloride, which reacts with the aluminum trihydrate filler and causes localized decomposition, foaming, and die-face deposits. Similarly, addition of amine-based processing aids is not recommended because amine groups accelerate decomposition of the vinyl-silane treatment on the mineral filler surface. The compound is suitable for cables evaluated under RoHS 2011/65/EU and applicable REACH candidate-list disclosure obligations.
