| HS Code | 398962 |
| Productname | WWJF-8013 Wind Speed Sensor |
| Producttype | Three-cup cup anemometer |
| Measurementelement | Wind speed |
| Workingprinciple | Rotating cups generate frequency signal proportional to wind speed |
| Measurementrange | 0-30 m/s |
| Accuracy | ±0.3 m/s |
| Resolution | 0.1 m/s |
| Startthreshold | ≤0.4 m/s |
| Outputsignal | Pulse frequency; optional 4-20 mA, 0-5 V, RS485 |
| Supplyvoltage | 12 V DC (optional 5 V DC) |
| Operatingtemperature | -20°C to +60°C |
| Protectionrating | IP65 |
| Standardcablelength | 2 m |
| Mountingtype | Mast or bracket clamp |
| Applications | Meteorological stations, agriculture, environmental monitoring, wind energy |
As an accredited WWJF-8013 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8013 is supplied in sealed 25 kg HDPE drums with a moisture-proof liner and clear hazard labeling. |
| Container Loading (20′ FCL) | Load WWJF-8013 into 20′ FCL container, secure drums evenly, distribute weight, and follow chemical transport safety regulations. |
| Shipping | WWJF-8013 ships as a hazardous chemical, UN Class 8, packed in UN-certified drums with corrosion-resistant liners. Use dedicated, ventilated transport with segregation from incompatible materials. Maintain temperature below 40°C, secure upright, and display hazard placards. Include safety data sheet and emergency response information. |
| Storage | Store WWJF-8013 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and incompatible substances. Keep the container tightly sealed when not in use and protect it from moisture. Ensure proper labeling, secondary containment for spills, and follow the safety data sheet and manufacturer’s storage instructions. |
| Shelf Life | Store unopened in a cool, dry place. Shelf life is 24 months from date of manufacture. |
In calendered rigid PVC film for thermoformed packaging, WWJF-8013, a methacrylate-butadiene-styrene core-shell impact modifier, is incorporated at 6–10 phr on PVC K-value 57–60 suspension resin. The dry blend is mixed in a hot mixer to 115–120°C, cooled to 40–45°C, and plasticized in a counter-rotating twin-screw extruder with an 36:1 L/D ratio. Optical haze measured per ASTM D1003-21 on 1 mm calendered sheet remains below 4.0% when the refractive index difference between the modifier shell and PVC is maintained below 0.005; the methyl methacrylate-rich shell of WWJF-8013 provides the required refractive index match at melt temperature 180–190°C. Instrumented falling-weight impact per ISO 6603-2 shows ductile failure ratios above 80% on 0.8 mm sheet at 8 phr, while the same test at 0°C requires 10 phr to retain a ductile failure ratio above 70%. Calender roll stack temperatures are held at 175–185°C on the upper rolls and 150–160°C on the lower rolls; line speeds above 35 m/min generate melt fracture and visible striations because the butadiene-rich core phase elongates under excessive roll shear. Recycled edge trim is reintroduced at 15–20 wt% without haze increase above 5.0% when the trim is cryogenically ground and dried to 0.08% moisture content. Moisture uptake above 0.15% generates pitting in the sheet surface; therefore, WWJF-8013 is pre-dried in a desiccant dryer at 55–60°C for 2 h when warehouse relative humidity exceeds 60%.
The injection-moulding route for clear PVC fittings relies on WWJF-8013 at 8–12 phr with stabiliser packages based on liquid tin mercaptide at 1.5–2.0 phr and a hydrotalcite costabiliser at 0.5 phr. The compound is processed on a 120-ton clamp injection-moulding machine with a 38 mm diameter general-purpose screw, 20:1 L/D ratio, and compression ratio of 2.2:1. Barrel temperature set points from feed to nozzle are 155°C, 165°C, 175°C, and 185°C; the hot runner is held at 190–195°C. If the melt temperature measured by an immersion probe exceeds 210°C, the polybutadiene phase in WWJF-8013 undergoes thermal-oxidative degradation, and the release of hydrogen chloride from PVC accelerates the breakdown. The first process indication is yellowing at the gate, followed by a drop in notched Izod impact at 23°C from 10.2 kJ/m² to 5.4 kJ/m² after a residence time of 6 min. The remedy is not to raise melt temperature, but to lower screw speed and back pressure to 0.3–0.5 MPa, reduce shot size to 50–70% of barrel capacity, and use a full-round runner of 6 mm diameter with a 2.0–2.5 mm sprue to avoid excessive shear. Notched Izod impact is evaluated per ASTM D256-23 on 3.2 mm specimens cut from the injection-moulded fitting wall; values above 8.0 kJ/m² at 0°C are accepted for ASTM D1784-20 cell class 12454 drainage fittings. Shrinkage is measured per ASTM D955-21 and is maintained between 0.4% and 0.7% when mould temperature is held at 30–40°C; lower mould temperatures produce weld lines with impact retention below 60% of the base wall value.
The impact-modification response of WWJF-8013 is non-linear. At low addition levels, the modifier particles act as stress concentrators in the rigid PVC matrix; above a critical interparticle distance, the overlapping stress fields around the polybutadiene cores initiate shear yielding and crazing. The following data are representative of a production-scale 36:1 L/D counter-rotating twin-screw compounding run on PVC K-value 57; published data for this specific configuration is limited, and actual values should be re-established on the target line.
| WWJF-8013 loading (phr) | Notched Izod at 23°C (kJ/m²) ISO 179-1 | Notched Izod at -10°C (kJ/m²) ISO 179-1 | Tensile yield strength (MPa) ASTM D638-14 | Haze on 1 mm sheet (%) ASTM D1003-21 |
|---|---|---|---|---|
| 0 | 3.1 | 2.0 | 52 | 3.8 |
| 4 | 6.4 | 3.8 | 49 | 4.1 |
| 8 | 9.8 | 5.6 | 46 | 4.6 |
| 12 | 12.7 | 7.2 | 42 | 5.5 |
Blow moulding of PVC bottles with WWJF-8013 at 8 phr uses a 65 mm extruder with a grooved feed bushing, 20:1 L/D barrier screw, and a diverging die head; parison temperature is held at 185–195°C. The modifier increases parison sag resistance at high output, but at loadings above 10 phr, pinch-off weld strength decreases because of oriented butadiene domains at the parting line. Bottle drop impact at 4°C is tested per ASTM D2463-21; containers blow-moulded at 8 phr withstand a 1.2 m drop without leakage, while the same bottle at 12 phr can exhibit pinhole fractures at the pinch-off zone after 0.8 m. Mould temperature is set to 12–18°C, and blow air pressure is maintained at 0.6–0.8 MPa. Pre-drying of WWJF-8013 at 55–60°C for 2 h is required when ambient relative humidity exceeds 60%; otherwise, moisture hydrolyzes the tin mercaptide stabiliser and produces silver streaks in the bottle wall.
In foamed rigid PVC sheet for signage and structural panels, WWJF-8013 is loaded at 6–10 phr with azodicarbonamide chemical blowing agent at 0.4–0.8 phr and an acrylic processing aid at 4–6 phr. The function of the modifier is to increase melt strength and stabilise the expanding cell structure during free-foam extrusion. Barrel temperatures are kept at 150–170°C, adapter at 165–175°C, and die at 180–185°C. If the die temperature exceeds 185°C, the exothermic decomposition of azodicarbonamide accelerates and the polybutadiene core in WWJF-8013 begins to degrade; cell walls tear, producing surface roughness and density variability greater than ±0.03 g/cm³ at a target density of 0.55 g/cm³. Sheet density is tested per ISO 1183-1:2019, and flexural modulus per ISO 178:2019 on 10 mm thick specimens cut from the foamed sheet. At 8 phr WWJF-8013, flexural modulus is reduced by approximately 10–15% relative to the unfoamed compound, which is within the accepted tolerance for signage boards requiring screw retention. Without the modifier, the same formulation exhibits cell coalescence and gross density differences across the sheet width; therefore, WWJF-8013 is considered a necessary component when the foam density is below 0.60 g/cm³.
Outdoor profile and siding compounds are not the default application for WWJF-8013 unless co-stabilised with an acrylic shell modifier or protected by an acrylic capstock. The polybutadiene-rich core absorbs UV radiation in the 300–350 nm range and generates conjugated carbonyl species; after 1500 h of accelerated weathering per ASTM G154-23, notched Izod impact retention at 6 phr falls to 55–65% of the initial value. In opaque pipe fittings installed underground or inside controlled indoor environments, impact retention above 85% after 12 months service is achievable. Therefore, unpainted exterior applications require either a weather-resistant capstock or substitution with an acrylic impact modifier for the substrate layer. This boundary is based on the inherent unsaturation of the butadiene phase and is not eliminated by thermal stabilisation alone.
Where WWJF-8013 is used in rigid PVC building products, the following standard designations apply to the finished article and are used as release criteria. Compliance of the modifier itself does not replace article-level certification.
| Article type | Article standard | Critical property | Test method |
|---|---|---|---|
| PVC-U drainage fittings | ASTM D2466-23 | Notched Izod impact at 0°C | ASTM D256-23 |
| Rigid PVC sheet for non-food thermoforming | ASTM D1784-20 cell class 12454 | Tensile yield strength | ASTM D638-14 |
| Foamed PVC sheet | ISO 178:2019 | Apparent density | ISO 1183-1:2019 |
| Blow-moulded PVC bottles | ASTM D2463-21 | Drop impact at 4°C | ASTM D2463-21 |
| Injection-moulded clear PVC fittings | ASTM D1784-20 cell class 12454 | Notched Izod impact at 23°C | ASTM D256-23 |
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WWJF-8013 is a halogen-free melamine polyphosphate–based flame retardant supplied as a free-flowing white powder. The model designation WWJF-8013 corresponds to a phosphorus–nitrogen synergistic grade intended for unreinforced and glass-filled polyamide 66, polyamide 6, and polybutylene terephthalate compounds that require a UL 94 V-0 classification without brominated diphenyl ether or antimony trioxide. According to the producer’s provisional technical communication, active phosphorus content is 12.0–13.5 wt% and nitrogen content is 8.0–9.5 wt% when measured by ISO 11885:2007 and ISO 16634-1:2008, respectively. The material is packaged in 25 kg multi-wall paper bags with an internal moisture barrier. Published lot-to-lot data for this exact grade are limited; the ranges reproduced in this document should be verified against each production certificate and downstream qualification lot.
The acceptance window for WWJF-8013 is defined by the analytical methods listed in Table 1. These methods are not all product-specific, and some are indirect methods that require matrix-matched calibration. The bulk density value is intended for hopper and loss-in-weight feeder calibration, not for melt density calculation.
| Property | Method | Value |
|---|---|---|
| Appearance | Visual inspection | White powder |
| Phosphorus content | ISO 11885:2007 | 12.0–13.5 wt% |
| Nitrogen content | ISO 16634-1:2008 | 8.0–9.5 wt% |
| Bulk density | ISO 60:1977 | 0.55–0.65 g/cm³ |
| Particle size D50 | ISO 13320:2020 | 8–12 µm |
| Moisture content | ISO 15512:2019 | ≤0.30 wt% |
| pH of 5% aqueous slurry | ISO 787-9:2019 | 6.0–8.0 |
| Thermal decomposition onset, 5% mass loss in N₂ | ISO 11358-1:2022 | ≥290 °C |
The particle-size distribution is controlled by laser diffraction using a dry dispersion unit with a 0.5 MPa injector and a vibratory feed setting that maintains an obscuration between 5 % and 15 %. D50 values outside 8–12 µm are usually caused by classifier rotor speed drift or feed-rate surging, and the resulting coarse fraction can reduce side-feeder throughput consistency in continuous compounding.
On a production-scale 40 mm co-rotating twin-screw extruder with a L/D 48:1 configuration, WWJF-8013 is metered downstream of the polymer melt seal through a twin-screw side feeder. For PA66 compounds, barrel zone temperatures are maintained between 250 °C and 265 °C, with the melt temperature at the die held below 280 °C. Screw speeds from 500 rpm to 700 rpm and a specific mechanical energy input below 0.30 kWh/kg have been used in production trials to disperse the additive without exceeding a melt residence time of 40 s. The processor must pre-dry WWJF-8013 at 80 °C for 4 h when storage relative humidity exceeds 60 %; residual moisture above 0.30 wt% produces hydrolysis-induced viscosity drift and irregular side-feeding.
At loadings above 20 wt% in unreinforced PA66, the additive functions as a condensed-phase flame retardant and increases melt viscosity. Capillary rheometry data generated under ISO 11443:2021 show an apparent viscosity rise of approximately 35–50 % at 100 s−1 and 270 °C, relative to the unfilled matrix. At 25 wt% loading, melt volume-flow rate measured under ISO 1133-1:2022 at 275 °C with a 5 kg load falls to 12–18 cm³/10 min from 40–50 cm³/10 min for the base PA66. This change requires lower barrel temperatures in the compression zone, higher injection speed, and faster screw recovery. Mould deposit is minimised when the compound is not allowed to remain in the barrel at temperatures above 280 °C for more than 10 min; intermittent purging with glass-filled PA66 is applied on hot-runner tools to remove accumulated phosphate residues.
At 30 % glass fibre loading, the compounded granulate absorbs atmospheric moisture more rapidly than the unfilled resin. Storage in sealed foil-lined containers at ≤25 °C and ≤50 % RH maintains granulate moisture content below 0.08 wt%. If containers are opened for more than 8 h under humid air, drying at 80 °C for 4–6 h is recommended before injection moulding. Moulds with thin-wall sections of 1.6 mm require a clamp force of at least 800 kN when processing PA66 compounds with 25 wt% WWJF-8013 to avoid flash caused by reduced melt viscosity at high shear rates.
The replacement of a brominated polystyrene/antimony trioxide package in unreinforced PBT with 20–22 wt% WWJF-8013 removes the bromine source and eliminates antimony trioxide handling. Under IEC 60695-11-10:2021, the resulting compound typically achieves V-0 at 1.6 mm and V-2 at 0.8 mm, although thin-wall reproducibility depends on mould fill balance and gate freeze-off. The comparative thermal stability difference appears as a lower decomposition onset for the phosphate system than for brominated epoxy systems, which places narrower limits on maximum melt temperature and purge time. The relative tracking index of WWJF-8013 compound is usually higher than brominated antimony systems because of the absence of conductive carbon residues; values above 550 V under IEC 60112:2020 are typical, while brominated antimony compounds commonly remain between 300 V and 450 V.
Compared with conventional ammonium polyphosphate, WWJF-8013 shows lower water solubles and less plate-out on chrome-plated mould surfaces. Material deposited after 500 injection cycles on a 120 t machine running PA66 with 25 wt% WWJF-8013 was a fine white film removable with alkaline cleaner rather than abrasive polishing. This behaviour differs from some melamine-free intumescent packages that release acidic species into the tool environment. The additive is incompatible with primary and secondary amine-based coupling agents and with zinc stearate above 0.5 wt%; these combinations may cause premature crosslinking, discolouration, or mould staining. When high wet-aged tensile strength is required, silane-treated glass fibre is preferred over amino-functional silanes that can interact with the phosphate surface.
The ranges in Table 2 are derived from producer provisional screening studies for glass-filled PA66 systems and are not guaranteed specification limits. They are shown only to position WWJF-8013 against alternative halogen-free and partial-replacement packages.
| Response | WWJF-8013 | Ammonium polyphosphate package | Zinc borate/APP synergistic package |
|---|---|---|---|
| Flame retardant loading for V-0 at 1.6 mm | 20–22 wt% | 25–28 wt% | 22–25 wt% |
| Compound density (ISO 1183-1:2019) | 1.38–1.42 g/cm³ | 1.35–1.40 g/cm³ | 1.42–1.48 g/cm³ |
| Tensile strength retention vs unmodified GF30 (ISO 527-2:2012) | 85–90 % | 78–85 % | 80–86 % |
| Comparative tracking index (IEC 60112:2020) | >600 V | >600 V | 500–600 V |
| Water extract pH (ISO 787-9:2019) | 6.0–8.0 | 5.0–7.0 | 7.5–9.0 |
The density increase observed with zinc borate/APP systems is linked to the higher inorganic residue. Tensile strength retention is sensitive to glass fibre sizing, screw configuration, and moisture content before moulding; the spread in each range represents variation across 3 production lots, not measurement uncertainty alone.
Regulatory control of WWJF-8013 is tied to the final compound. Under Directive 2011/65/EU as amended by (EU) 2015/863, the grade contains no intentionally added brominated diphenyl ethers; verification is by EN 14582:2016 combustion ion chromatography with a reporting limit of 100 ppm. Under Regulation (EC) No 1907/2006, downstream users are responsible for confirming whether the substance mixture exceeds the communication threshold of 0.1 wt% for any candidate-list SVHC. Safety data sheets are required under Regulation (EC) No 1907/2006, Annex II.
Thermogravimetric analysis under ISO 11358-1:2022 in nitrogen at 10 °C/min indicates that the mass-loss curve is sensitive to crucible type, purge gas velocity, and sample mass. The producer’s provisional TGA curve shows 5 % mass loss at ≥290 °C only when the sample is dried to ≤0.1 wt% moisture and run at a purge gas flow of 50 mL/min; undried samples lose surface water below 120 °C and shift the measured onset downward by as much as 15 K. In extrusion, the practical processing limit is therefore controlled less by chemical decomposition than by the ability to remove surface moisture and exit the die before accumulated thermal exposure reaches the decomposition threshold. Production-scale lots have exhibited batch-to-batch variance in D50 of ±3 µm when the air classifier was operated outside the supplier’s recommended rotor speed window. This variance has been shown to affect side-feeder stability more than final combustion performance, but it remains a quality parameter for continuous compounding.
