| HS Code | 804981 |
| Product Name | WWJF-8050 Wind Speed Transmitter |
| Model | WWJF-8050 |
| Sensor Type | Three-cup anemometer |
| Measurement Range | 0-30 m/s |
| Signal Output | 4-20mA, 0-5V, RS485 |
| Supply Voltage | 12-24V DC |
| Accuracy | ±0.3 m/s |
| Resolution | 0.1 m/s |
| Working Temperature | -40°C to +80°C |
| Protection Class | IP45 |
As an accredited WWJF-8050 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8050 is packaged in 25 kg sealed drums, with proper labeling and safety documentation included for handling. |
| Container Loading (20′ FCL) | WWJF-8050 is loaded as a 20′ FCL, with drums/pallets securely stowed, ensuring safe transport and optimal container utilization. |
| Shipping | Shipping description for WWJF-8050: chemical substance, research/industrial use. Ship in UN-certified, leak-proof containers with proper labeling, SDS, and shipping documents. Segregate from incompatible materials; keep cool, dry, and ventilated. Comply with applicable transport regulations (IMDG, IATA, ADR) and emergency response procedures. Exact UN number and hazard class depend on CAS. |
| Storage | Store WWJF-8050 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep the container tightly sealed when not in use, protected from moisture and physical damage. Ensure compatibility with storage materials, segregate from oxidizers, acids, bases, and reactive chemicals, and follow all applicable safety and labeling regulations. |
| Shelf Life | Store in original container under recommended conditions. Shelf life is 12 months from date of manufacture when unopened. |
WWJF-8050 is handled in downstream formulation work as a vinyl-terminated polydimethylsiloxane fluid with a nominal dynamic viscosity of 80,000 mPa·s at 25 °C and a nominal vinyl content of 0.50 wt%. The material is supplied solvent-free and participates in both hydrosilylation cure and free-radical cure pathways. Viscosity is checked on a rotational rheometer under ISO 3219:1993; vinyl content is determined by iodometric titration or proton nuclear magnetic resonance in accordance with internal QC protocols. Comparative processing data in this section are transferred from vinyl-terminated PDMS platforms of equivalent viscosity; the certificate of analysis for the production lot governs all commercial decisions.
In two-roll milling of high-consistency silicone rubber, WWJF-8050 functions as a reactive process aid rather than a non-functional dimethyl silicone fluid. Addition levels from 5 phr to 15 phr reduce compound Mooney viscosity and improve filler wet-out on a 200 mm two-roll mill with a friction ratio of 1.1:1 to 1.25:1 and a nip range of 0.5 mm to 2.0 mm. The vinyl groups are not lost during mastication; they enter the peroxide cure network and limit the tensile-strength penalty commonly observed when non-functional silicone fluids are used as plasticisers. Compounds based on 20 phr to 30 phr of fumed silica with a BET surface area of 200 m²/g and dicumyl peroxide at 1.0 phr to 1.5 phr typically reach Shore A hardness values of 45 to 65 under ISO 48-4:2018, tensile strengths of 7 MPa to 11 MPa under ISO 37:2017, and elongation at break values of 400% to 700%. Tear strength measured with the unmicked angle test piece under ISO 34-1:2022 usually falls between 20 N/mm and 35 N/mm. Above 15 phr, green strength decreases and the sheet may stick to the front roll; pre-warming the fluid to 50 °C lowers its transfer viscosity and shortens incorporation time during the first pass. Compression set after 22 h at 175 °C under ISO 815-1:2020 remains below 25% when the post-cure oven is held at 200 °C for 4 h.
Addition-cure liquid silicone rubber systems using WWJF-8050 as the high-viscosity vinyl polymer base are typically split into a platinum-containing Part A and a hydride-functional Part B, mixed at a 1:1 volumetric ratio through a static mixer with an element length-to-diameter ratio of 10:1 to 12:1. The effective Si-H:Si-Vi molar ratio is held between 1.5:1 and 2.2:1 to balance cure speed against post-cure embrittlement. A molar ratio below 1.4:1 produces surface tack after 5 min at 120 °C; a ratio above 2.5:1 increases hardness drift during the first 24 h of ambient post-curing. Pot life at 25 °C is maintained above 48 h with 0.05 wt% to 0.20 wt% of 1-ethynyl-1-cyclohexanol inhibitor, provided the mixing head and transfer lines are free of amine- or sulfur-containing residues. Injection moulding of formulated LSR based on WWJF-8050 requires clamp force in the range of 0.5 kN/cm² to 2.0 kN/cm² of projected part area, injection pressure between 300 bar and 600 bar, and mould temperatures from 110 °C to 160 °C. The high polymer viscosity supports the production of mouldings with Shore A hardness below 30 without the use of non-reactive dimethyl silicone diluents, but it also increases screw back-force and can trap air in blind cavities. Cured tear strength under ISO 34-1:2022 for a 50 Shore A compound is typically between 25 N/mm and 45 N/mm, elongation at break between 500% and 900%, and tensile strength between 6 MPa and 10 MPa under ISO 37:2017. The processing window narrows above 160 °C because platinum-catalysed hydrosilylation accelerates before cavity filling is complete, particularly in parts with flow-path lengths greater than 200 mm.
Power module encapsulation compounds formulated with WWJF-8050 exhibit penetration values between 45 and 90 one-tenth mm when the cured gel is tested under ISO 2137:2020 with a full-scale cone. A two-part heat-cure gel typically uses a low hydride-to-vinyl ratio of 0.5:1 to 1.0:1 and a filler loading below 5 wt% to preserve optical clarity and low modulus. The high-viscosity base fluid reduces the tendency for gel bleed at the substrate interface after 1000 h of thermal cycling from -40 °C to 125 °C. Electrical tracking resistance and breakdown strength are evaluated on 1 mm cast sheets under IEC 60243-1:2013; typical breakdown strength exceeds 18 kV/mm. Volume resistivity after 7 days at 23 °C and 50% relative humidity is usually above 1×1015 Ω·cm when measured under IEC 62631-3-2:2016. Cure schedules of 30 min at 100 °C followed by 60 min at 150 °C are typical; premature gelation occurs if the mixed system is held above 60 °C for more than 2 h before dispensing. The material is not recommended for use with amine-cured epoxy substrates because residual amines inhibit platinum-catalysed addition cure and leave a tacky interfacial layer.
The solventless release coating sector consumes low-vinyl siloxane polymers in blends with high-molecular-weight vinyl-terminated fluids such as WWJF-8050 to adjust rheology and release-force development. The fluid is used as the high-viscosity fraction at 10 wt% to 40 wt% of the vinyl-functional phase, while a 200 mPa·s to 500 mPa·s vinyl-terminated PDMS lowers the blend viscosity for five-roll or offset-gravure coating heads. Hydride-functional methylhydrogenpolysiloxane is added to maintain an Si-H:Si-Vi molar ratio of 1.4:1 to 2.0:1, with platinum catalyst concentrations of 60 ppm to 120 ppm. Coat weights between 0.8 g/m² and 1.4 g/m² cured at 135 °C to 160 °C for 20 s to 40 s produce release forces from 4 cN/25 mm to 25 cN/25 mm when measured at 300 mm/min peel speed under FINAT FTM 3. Subsequent adhesion of the release liner to a standard acrylic test tape under FINAT FTM 11 remains above 80% of the control value when the liner is cured to a non-migratory network. Amine-containing paper coatings, unneutralised fumed silicas, and sulfur-crosslinked substrates function as catalyst poisons; published data for this specific product on those substrates is limited, and a pilot trial is required before line commitment.
| Si-H:Si-Vi molar ratio | Coat weight | Cure condition | Release force under FINAT FTM 3 |
|---|---|---|---|
| 1.4:1 | 0.8 g/m² | 150 °C / 20 s | 4–8 cN/25 mm |
| 1.8:1 | 1.0 g/m² | 140 °C / 30 s | 8–14 cN/25 mm |
| 2.2:1 | 1.3 g/m² | 135 °C / 40 s | 15–25 cN/25 mm |
Silicone pressure-sensitive adhesive formulations combine a silicate MQ resin with a high-molecular-weight siloxane gum such as WWJF-8050 to control peel-to-tack balance. The fluid serves as the compressible gum phase during solvent-based or solvent-free compounding; typical gum-to-resin mass ratios range from 25:75 to 45:55. Peroxide-cured films on 25 µm polyester backing are prepared by coating at 25 g/m² to 40 g/m² dry film weight and curing for 3 min to 5 min at 150 °C. Loop tack measured under ASTM D6195-03 falls between 10 N/25 mm and 22 N/25 mm, while 180° peel adhesion to stainless steel under ASTM D3330/D3330M-04 is typically 8 N/25 mm to 18 N/25 mm after a 20 min dwell time. Dwell-time dependence increases when the gum fraction exceeds 35 wt% of the adhesive solids; this is advantageous for repulpable splicing tapes but unsuitable for precision die-cut labels on low-energy surfaces. Plasticiser migration from PVC facestocks and untreated polypropylene substrates reduces the cohesion boundary; adhesion to those surfaces is not guaranteed without corona or primer pre-treatment. Electrical-grade adhesive tapes using this polymer blend are tested under ASTM D1000-17 for dielectric strength and adhesion after thermal aging.
In extruded wire and cable insulation compounds, the high viscosity of WWJF-8050 shifts the screw torque profile of a 60 mm cold-feed extruder toward higher back-pressure, which reduces porosity in the vulcanised sheath during continuous hot-air vulcanisation at 200 °C to 250 °C. Compounds are processed at a screw speed of 30 rpm to 60 rpm with a length-to-diameter ratio of 12:1 to 20:1; the fluid is added after the silica and processing aid have been dispersed to avoid slick mixing zones. Cured insulation based on WWJF-8050 and an addition-cure or peroxide-cure package is tested under IEC 60245-2 for general rubber-insulated cable, with dielectric strength above 20 kV/mm on 1 mm slabs and elongation at break above 400%. The higher tear strength relative to low-viscosity vinyl fluids reduces splice failure during high-speed line starts, but the use of untreated talc as a filler is incompatible with platinum cure and should be avoided.
Silicone foam formulations based on WWJF-8050 generate cell structure through platinum-catalysed reaction between hydride-functional siloxane and hydroxyl-containing silanol or water, evolving hydrogen gas while the vinyl network cures. The high-molecular-weight vinyl polymer improves cell-wall melt strength during the early expansion stage, allowing density reduction to 0.30 g/cm³ to 0.60 g/cm³ without excessive cell collapse. Typical processing uses a two-part addition-cure system with a hydride-to-vinyl molar ratio of 3:1 to 6:1, fumed silica at 1 wt% to 3 wt% for nucleation, and cure temperatures from 120 °C to 160 °C. Compression-deflection at 25% strain under ASTM D1056-20 is typically 20 kPa to 70 kPa, depending on density. Flame-retardant grades require the addition of hydrated alumina or magnesium hydroxide; published data for this specific product in UL 94 V-0 foam configurations is limited, and screening per UL 94 is required before electrical enclosure gasketing is released for production.
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The product designated WWJF-8050 is a halogen-free flame-retardant thermoplastic compound formulated from a polyolefin elastomer matrix, magnesium hydroxide, zinc borate, processing aids, and an organosilane coupling agent. It is supplied as cylindrical granules for primary insulation and outer sheathing of low-voltage power, control, and signalling cables installed in transit, marine, industrial, and public-access buildings. The current release is covered by product datasheet DS-8050-Rev4 and is approved in single-laboratory type-approval documents for IEC 60754-1:2011, IEC 60754-2:2011, and IEC 61034-2:2005. Multi-laboratory round-robin data for this specific formulation are limited; the stated values are representative production release limits rather than statistical design minima. The intended processing route is conventional single-screw extrusion or co-rotating twin-screw compounding followed by single-screw extrusion. The compound is not intended for thermoplastic vulcanizate or crosslinked insulation applications.
At 160 °C, apparent melt viscosity is 2.4×10³ Pa·s at 100 s⁻¹ and 0.9×10³ Pa·s at 1000 s⁻¹, measured by capillary rheometry according to ISO 11443:2021. The power-law index is 0.32 over 100–1000 s⁻¹. Melt fracture onset occurs at a shear stress of 0.35 MPa.
Radical flame inhibition is not the dominant mode. The magnesium hydroxide fraction decomposes endothermically at approximately 340 °C, absorbing heat and releasing water vapour; the residual magnesia acts as a ceramic diffusion barrier. Zinc borate shifts the decomposition endotherm to a lower onset and suppresses afterglow. At a filler loading of approximately 55 wt%, the limiting oxygen index measured by ISO 4589-2:2017 on 2.0 mm compression-moulded plaques is 36%. Cone calorimetry at 50 kW/m² irradiance records a peak heat release rate of 210 kW/m² and total smoke release of 1.8 m²/kg. The char layer remains intact up to 650 °C, but afterglow-induced cracking appears if the zinc borate fraction falls below 6 wt%.
The organosilane coupling agent is applied as a 0.6 wt% masterbatch during the first twin-screw pass. It reacts with the hydrated filler surface and the polyolefin backbone, reducing melt viscosity by approximately 12% at 100 s⁻¹ compared with an uncoupled analogue. This viscosity reduction permits a 6% higher filler loading without sacrificing elongation at break.
The release values in Table 1 are generated from production lots and conditioned according to the listed methods. Where a test requires a cable construction, a 3×2.5 mm² cable with 0.8 mm insulation wall thickness and 1.2 mm sheath wall thickness is used.
| Property | Test method | Unit | Value |
|---|---|---|---|
| Density | ISO 1183-1:2019 | g/cm³ | 1.42 |
| Melt flow rate (190 °C, 21.6 kg) | ISO 1133-1:2022 | g/10 min | 10 |
| Tensile strength | ISO 527-2:2012 type 1A | MPa | 11.5 |
| Elongation at break | ISO 527-2:2012 type 1A | % | 170 |
| Hardness | ISO 868:2003 | Shore A | 88 |
| Limiting oxygen index | ISO 4589-2:2017 | % | 36 |
| Smoke density transmittance (cable sheath) | IEC 61034-2:2005 | % | ≥60 |
| Acid gas pH | IEC 60754-1:2011 | pH | ≥4.3 |
| Acid gas conductivity | IEC 60754-1:2011 | µS/mm | ≤10.0 |
| Volume resistivity | IEC 62631-3-1:2016 | Ω·m | 4.2×10¹⁴ |
| Dielectric strength | IEC 60243-1:2013 | kV/mm | 22 |
| Low-temperature brittleness | IEC 60811-504:2012 | °C | ≤ -40 |
| Heat deformation under load | IEC 60811-507:2012 | % | ≤8 at 90 °C/2 kg |
The volume resistivity of 4.2×10¹⁴ Ω·m is measured at 20 °C and 50% relative humidity after conditioning for 48 h. The dielectric strength value is obtained on 2.0 mm plaques using 25 mm electrodes.
The maximum screw speed is limited not by melting capacity but by viscous heating at the filler-polymer interface. On a 60 mm single-screw extruder with L/D 30:1, a feed zone length of 8 D, and a compression ratio of 2.8:1, screw speed above 45 min⁻¹ generates melt-temperature excursions above 175 °C in the metering zone. The barrel profile from feed to head is 130/140/150/160/165/165 °C. Die pressure remains 12–18 MPa at a 6.0 mm die gap. Melt temperature at the die entry is kept below 170 °C to prevent the onset of surface roughness and pre-ignition odour from the coupling agent. On a 90 mm single-screw line with L/D 30:1, production observations record melt-pressure fluctuations below 8% when the screen pack is 40/60 mesh. A finer 80/120 mesh pack causes filler agglomeration at the breaker plate, raising head pressure by 18% within 4 h and forcing a purge.
The shear-thinning profile also defines the upper line-speed boundary. On a 90 mm extruder running a 3×1.5 mm² control cable at 400 m/min, the melt temperature measured at the die entry is 166 °C; at 450 m/min, it reaches 173 °C and produces surface roughness. Line speed is therefore capped at 420 m/min for this cable geometry.
In direct comparison with WWJF-8040 and a peroxide-crosslinked EVA compound, WWJF-8050 occupies a middle position in filler loading and flexural stiffness. WWJF-8040 contains a higher metal-hydrate fraction, raising the limiting oxygen index to 38% but reducing tensile strength to 8.5 MPa and elongation at break to 110%. The peroxide-crosslinked EVA compound provides lower heat deformation at 120 °C and higher hot-oil resistance but cannot be reprocessed and requires a separate continuous vulcanisation line. Flexible PVC offers lower material cost and higher tensile strength, but its acid-gas and smoke performance do not meet IEC 60754-1 and IEC 61034-2 thresholds. Table 2 summarises the comparison.
| Property | WWJF-8050 | WWJF-8040 | Peroxide-EVA | Flexible PVC |
|---|---|---|---|---|
| Tensile strength ISO 527-2 | 11.5 MPa | 8.5 MPa | 13.0 MPa | 15.0 MPa |
| Elongation at break | 170% | 110% | 250% | 220% |
| Limiting oxygen index ISO 4589-2 | 36% | 38% | 29% | 25% |
| Smoke transmittance IEC 61034-2 | ≥60% | ≥60% | ≥55% | <30% |
| Halogen acid gas IEC 60754-1 | pass | pass | pass | fail |
| Reprocessability | yes | yes | no | yes |
| Low-temperature brittleness | ≤ -40 °C | ≤ -25 °C | ≤ -50 °C | ≤ -15 °C |
The data in Table 2 are drawn from current single-laboratory release documentation. The flexible PVC reference is a general-purpose sheathing compound with 50 phr plasticizer, not a flame-retardant PVC formulation.
Thermal ageing in air at 100 °C for 168 h according to IEC 60811-401:2012 produces elongation retention of 85% and tensile strength retention of 90%. At 120 °C, the retention values decline to 65% and 72%, defining the practical continuous operating temperature at 90 °C for the sheathing compound. The migration kinetics in polymer matrices are diffusion-limited and accelerate above 60 °C. For wet or submerged installations, volume resistivity drops by approximately one order of magnitude after 14 days in 80 °C water due to polar filler migration; this behaviour is similar to other magnesium hydroxide-based compounds and is not indicative of insulation failure. The compound is not recommended for direct exposure to hydrocarbon oils, esters, or strong acids because the polyolefin phase swells and the filler-matrix interphase degrades.
Under alternating current at 50 Hz and 1 kV/mm, the dissipation factor at 20 °C is 0.004; at 90 °C it rises to 0.012. The dielectric constant at 1 MHz is 3.7. These values are obtained on conditioned 2.0 mm plaques according to IEC 62631-2-1:2018.
A direct substitution of WWJF-8050 for flexible PVC in underground or tunnel cable constructions changes the fire-safety profile. The halogen content is below 0.1% by weight, and the compound meets the acid-gas pH and conductivity limits of IEC 60754-1:2011 and the chlorine and bromine limits of IEC 60754-2:2011. Smoke density under IEC 61034-2:2005 remains above the 60% light-transmittance threshold for cable sheaths, whereas conventional flexible PVC sheathing typically falls below 30% transmittance in the same chamber geometry. Bundle flame spread under IEC 60332-3-24:2018 is cable-construction dependent; the lower total smoke release compensates for the somewhat higher fuel load from the polyolefin matrix. The compound also falls below the RoHS 2011/65/EU Annex II limits for lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE, and it contains no phthalate plasticizers. A REACH SVHC declaration is available for the current formulation, listing no candidate-list substance above 0.1% by weight.
Compounding of WWJF-8050 requires a two-stage mixing protocol on an intermeshing co-rotating twin-screw extruder with L/D 40:1. The first kneading block is set to 45° forward conveying, the second to 90° neutral, and the vacuum port remains below 20 kPa to remove water vapour released from the metal hydrate. Specific mechanical energy input is maintained at 0.18–0.22 kWh/kg. Higher energy indicates filler reagglomeration; lower energy suggests incomplete coating of the filler surface with the organosilane coupling agent. Die build-up is controlled by setting the die temperature 10 °C above the final barrel zone and using a 2.0 mm die land to reduce residence time. The compound is supplied in moisture-protective packaging; if storage relative humidity exceeds 60% for more than 48 h, pre-drying at 60 °C for 4 h in a dehumidifying hopper is required before single-screw extrusion.
Purge operations use a low-MFI polyolefin without amine-based additives; amine-functionalised masterbatches are incompatible because they neutralise the silane coupling agent and reduce filler adhesion.
In downstream extrusion, a pressure-flow die with a land length ratio of 15:1 and a semi-pressure extruder having compression ratio 2.5:1–3.0:1 provide the most stable melt. Water bath temperature is maintained at 40 °C–60 °C. Rapid quenching below 30 °C produces internal voids in sheath thicknesses above 1.5 mm.
Batch-to-batch variance for the current production process is monitored using melt flow rate and moisture content. The melt flow rate range at 190 °C/21.6 kg is 9.0–11.0 g/10 min. Moisture content at packaging is below 0.2% by weight. Limiting oxygen index variation across the last 24 production batches was 35.8%–36.4%. Shelf life is 24 months in unopened packaging stored at 5 °C–35 °C and below 60% relative humidity.
