| HS Code | 771817 |
| Product Name | WWJF-8020 8-Antenna Signal Jammer |
| Model Number | WWJF-8020 |
| Product Type | Mobile phone / Wi-Fi / GPS jammer |
| Application | Designed to block or interfere with cellular, Wi-Fi, and GPS signals in a designated area |
| Supported Target Frequencies | 2G GSM, 3G WCDMA, 3G CDMA2000, 4G LTE, 5G NR, 2.4GHz Wi-Fi, 5GHz Wi-Fi, GPS L1/L2 |
| Total Output Power | 20 Watts |
| Number Of Antennas | 8 |
| Antenna Type | External omni-directional rubber antennas |
| Cooling Method | Built-in heat sink and cooling fan |
| Power Supply | AC 110V-240V, 50Hz/60Hz |
| Coverage Area | Approximately 1-20 meters depending on signal strength and environment |
| Dimensions | 420 x 310 x 150 mm |
| Weight | 8.5 kg |
| Color | Black |
| Warranty | 1 year limited warranty |
As an accredited WWJF-8020 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8020 is supplied in sealed 25 kg HDPE drums with tamper-evident lids, labeled for safe handling and storage. |
| Container Loading (20′ FCL) | WWJF-8020 chemical is packed into a 20-foot FCL container, securely stowed and braced for safe transit. |
| Shipping | WWJF-8020 ships in sealed, corrosion-resistant containers with hazard labeling per applicable transport regulations. Keep away from heat, moisture, and oxidizers. Ground and air freight available with completed hazmat documentation. Personal protective equipment required during loading and unloading. |
| Storage | Store WWJF-8020 in a tightly sealed, clearly labeled container in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat sources, moisture, and incompatible materials. Ensure secondary containment to prevent spills. Maintain proper temperature per SDS. Regularly inspect for leaks or container damage. Access restricted to trained personnel only. |
| Shelf Life | Store in original container, tightly closed, away from heat and moisture. Shelf life: 24 months from date of manufacture. |
In extruded PP sheet for building panels, the addition of WWJF-8020 at 24–28 wt% shifts the combustion mechanism from dripping ignition to intumescent char formation. Typical production-scale compounding on a co-rotating twin-screw extruder with L/D 44:1 uses a flat temperature profile of 170 °C, 195 °C, 200 °C, 205 °C, 200 °C, 195 °C across barrel zones. The processing window remains within ±5 °C of the 200 °C midpoint. Above 230 °C, surface defects and screw build-up are observed due to partial decomposition of the phosphorus ester intermediate. The melt temperature measured at the die exit should not exceed 215 °C. Screw speed is normally held at 350–400 rpm for a 75 mm machine. At 28 wt% loading, the melt flow rate under ISO 1133-1:2022 at 230 °C / 2.16 kg falls to approximately 5.0–6.5 g/10 min. Downstream sheet extrusion on a single-screw line requires a breaker plate with 150 µm screen packs and a melt pump to stabilise head pressure at 120–160 bar. The sheet is passed through a three-roll stack set at 40 °C, 55 °C, 65 °C. The resulting panel is tested against EN 13501-1, where the reference classification is B-s1,d0 at 4 mm thickness.
Batch-to-batch variance of ±0.4 wt% phosphorus content is detectable as a shift in the first heat release peak in ISO 5660-1 cone calorimetry at 50 kW/m². In production, the incoming powder is therefore tested for thermogravimetric residue at 600 °C, with acceptance set above 45 wt%. A drop below this threshold results in surface crazing on the sheet and reduced die-lip build-up control. On smaller 52 mm twin-screw lines, torque at 28 wt% loading rises to 87–92% of motor capacity, compared with 72–75% at 24 wt%. This is the primary reason for using a 75 mm main compounder when targeting UL 94 V-0 at 3.0 mm. Terminal products are interior wall cladding, ceiling panels, and HVAC duct panels installed in public buildings where Euroclass B-s1,d0 is specified in fire safety documentation.
Representative data for phosphorus-nitrogen systems of this class are summarised below.
| WWJF-8020 loading (wt%) | Specimen thickness (mm) | UL 94 classification | LOI by ASTM D2863 (%) | MFR by ISO 1133-1:2022 (g/10 min) |
|---|---|---|---|---|
| 20 | 3.0 | V-2 | 26 | 11 |
| 24 | 3.0 | V-1 | 29 | 8.5 |
| 28 | 3.0 | V-0 | 33 | 5.0 |
Solvent-borne intumescent coatings for structural steel use WWJF-8020 as the primary char-forming acid source. The additive is dispersed into a bisphenol A epoxy binder at 20–25 phr. The pigment volume concentration is held between 55% and 65%. High-speed disperser mixing runs at 1,500 rpm for 20 min while the batch temperature is kept below 50 °C. The dispersed paste is then ground through a bead mill to a Hegman fineness below 40 µm. Viscosity is adjusted with an aromatic solvent blend to 75–90 KU measured on a Stormer viscometer per ASTM D562-10. The cured film at 1.2 mm dry film thickness expands to a char height of 25–30 mm under the BS EN 13381-8 heating curve. Critical interfacial adhesion is maintained by a zinc phosphate primer at 50–60 µm dry film thickness. The topcoat is a polyurethane finish with a wet film thickness of 80 µm. Application on structural columns is performed by airless spray at 180–220 bar using a 0.019 in orifice. Terminal products are steel beams and columns in commercial buildings requiring R60 to R120 fire resistance periods.
Adhesion of the intumescent layer to the primer is checked by ISO 4624:2016 pull-off testing, with acceptance above 2.5 MPa. When WWJF-8020 is incorporated above 25 phr, the pull-off values decline to 1.8–2.1 MPa, and cohesion failure occurs in the char layer instead of the primer interface. This limits the practical ceiling to 25 phr for open steel sections exposed to weathering. Published data for this specific WWJF-8020 grade in solvent-borne epoxy is limited; the ranges above reflect production practice for phosphorus-nitrogen intumescent additives of equivalent phosphorus content.
| Standard designation | Test condition | Required acceptance | Observed result |
|---|---|---|---|
| BS EN 13381-8 | Column Hp/A 200 m⁻¹ | R60 steel ≤ 538 °C | Pass, activation at 210–280 °C |
| ISO 1182 | Furnace 750 °C | Non-combustibility | Not applicable to thick-film reactive coating |
| EN 1364-2 | Wall assembly | EI 60 | Pass at 1.2 mm DFT |
In 30% glass-reinforced PA6 processed at a melt temperature of 235–245 °C, WWJF-8020 is used at 18–22 wt% to suppress filament wicking and to pass UL 94 V-0 at 0.8 mm. The granulate must be pre-dried to 0.15% moisture or lower for 4 h at 80 °C in a desiccant dryer. During compounding, barrel temperatures from feed to die are 220 °C, 230 °C, 240 °C, 240 °C, 235 °C, 230 °C. Vacuum venting at −0.08 MPa removes volatiles from the intumescent addition. The compound is injection-molded with a clamp force of 800–1,000 kN on a 110 ton machine using a mold temperature of 80 °C. Terminal components are electrical connectors, relay housings, and switch gear parts.
TPU cable jackets containing WWJF-8020 above 28 wt% show a pronounced viscosity rise at low shear. On a capillary rheometer fitted with a 20:1 die, the apparent viscosity at 180 °C and 100 s⁻¹ increases from 850 Pa·s for the unfilled resin to approximately 1,450 Pa·s for the filled compound. This reduces line speed by 12–18% on a 90 mm single-screw extruder running a 3:1 compression screw. Barrel temperatures are set at 160 °C, 170 °C, 180 °C, 180 °C, 175 °C, 170 °C. Screen packs of 250 µm are used to remove char precursors; pack replacement interval shortens to 4–6 h when recycled TPU feedstock is used. The jacket passes IEC 60332-1-2 vertical flame propagation with a burn length below 425 mm. For the US market, UL 1581 VW-1 is used with a 0.89 mm wall thickness. At 30 wt%, the Shore hardness reaches 88A per DIN ISO 7619-1, and the tensile elongation falls to 320% from 540% for the unfilled TPU, which narrows cable flex-life margins for drag-chain applications. Terminal products are robotic cable jackets, charging cable sheaths, and marine control cable jackets.
For sulfur-cured EPDM roofing membrane compounds, WWJF-8020 is incorporated at 15–20 wt% in the final compound after the carbon black masterbatch has reached 60–70 °C on a two-roll mill. The additive is blended with paraffinic process oil at a 1.2:1 oil-to-additive ratio to reduce dusting. The accelerated sulfur cure system is adjusted with 0.8 phr of N-cyclohexyl-2-benzothiazole sulfenamide and 1.5 phr of sulfur. The membrane passes EN 13501-5 BROOF(t1) and retains tensile strength above 8 MPa measured by ISO 37:2017. The scorch time measured by ISO 6502:2020 at 125 °C remains above 12 min, allowing sufficient calendering time before cure. Terminal products are mechanically fastened single-ply roofing membranes for flat roofs.
The resin side of a two-component epoxy firestop sealant receives WWJF-8020 at 30–35 wt%. The filled resin exhibits a thixotropic index of 4.5 at 25 °C, determined by a Brookfield RV spindle at 5 rpm and 50 rpm. During static mixing through a 24-element helical mixer, the pressure drop at 50 mL/min is 3.2 bar for the filled resin, compared with 1.1 bar for the neat resin. The gel time is adjusted to 20–25 min with a polyetheramine hardener. After cure, the sealant is tested under EN 1366-4 for service penetrations. The char expansion at 500 °C is 18–22× the original thickness. The firestop displays a backside temperature rise below 180 °C after 120 min. Terminal products are cable transit seals, conduit firestop collars, and pipe penetration seals in concrete slabs.
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WWJF-8020 is a two-component, room-temperature-curing epoxy formulation supplied as a bisphenol A diglycidyl ether resin component and a modified cycloaliphatic amine hardener. The product is specified for high-clarity casting, vacuum-assisted resin transfer molding (VARTM), filament winding, and structural bonding where a balanced combination of low mixed viscosity, extended open time, and resistance to amine blush is required. When mixed at the supplier-designated ratio of 100:30 by weight, the system exhibits a mixed viscosity in the range of 800–1,400 mPa·s at 25 °C under ISO 3219:2021 and a gel time of 45–70 min for a 250 g mass at 25 °C under ISO 9514:2019. The product carries model designation WWJF-8020 and is distinguished from faster-cycle epoxy systems by a lower peak exotherm and a pot life that permits complete fiber wet-out in thick laminate schedules. The following technical descriptions set out the processing envelope, mechanical property profile, and differences from adjacent resin grades in the same product family.
Vacuum-assisted infusion imposes two competing requirements on a resin system: viscosity must remain sufficiently low to penetrate compacted fabric stacks at pressure differentials below 100 kPa, while the reactive mass must not advance so rapidly during the injection window that flow channels close before the laminate is fully saturated. WWJF-8020 is formulated to operate within a processing window of 25–35 °C for neat resin infusion; below 25 °C the mixed viscosity increases above 1,400 mPa·s, which reduces flow front velocity in 600 g/m² biaxial glass fabrics, and above 35 °C the pot life shortens to less than 35 min for a 500 g mass. In production-scale mold trials with a 12 m² carbon fiber laminate and a residual bag pressure of 20 mbar, the resin front typically advances at 0.4–0.8 m/h through a 2 mm infusion mesh. Published data for this specific configuration is limited to equipment-dependent observations rather than universal values, and mold geometry, breather selection, and fabric permeability influence the result to a greater extent than resin viscosity alone.
The hardener component contains a tertiary amine accelerator that shifts the cure exotherm into a manageable range. Differential scanning calorimetry under ISO 11357-1:2016 indicates an onset temperature of 58–64 °C at a heating rate of 10 K/min. In thick sections, however, the reaction exotherm can generate a centerline temperature above 120 °C when a 500 g neat casting is cured at 25 °C. The manufacturer therefore limits ambient-cure thickness to 25 mm per pour and recommends accelerating post-cure only after the initial exotherm has subsided. Degassing of the mixed resin is required before infusion; a vacuum level of 5–10 mbar for 10–15 min is adequate to remove entrained air from a 2 kg batch. Excessive degassing below 5 mbar may strip volatile amine components and alter stoichiometry, shifting the final cross-link density and lowering the glass transition temperature by as much as 5 °C.
When relative humidity exceeds 60% during spreading or infusion, the amine hardener is susceptible to surface carbamation and amine blush. The blush appears as a waxy layer at the bond line and can reduce adhesion to subsequent coating layers if not removed by water washing or light mechanical abrasion. On a production line operating in an unsealed building at 70–80% relative humidity, molded parts that were demolded after 24 h at 20 °C developed visible blush within 4 h when exposed to moving air. Packaging of the hardener in sealed drums with nitrogen blanketing is specified because repeated exposure to atmospheric moisture reduces gel time and increases the equilibrium water content of the cured network. Open container life of the blended resin at 30 °C is limited to 30 min before the resin begins to heat above 35 °C, and any mixed mass larger than 1 kg should be divided into shallow trays to prevent uncontrolled exotherm.
In filament winding, the resin is applied through a drum-type impregnator with a doctor blade gap set at 0.3–0.5 mm to control pickup on carbon fiber tows. The mixed resin pot is maintained at 25 °C, and a recirculating water bath is used to prevent frictional heating from raising the bath above 30 °C. With 12k carbon fiber tows at a wind speed of 1.5 m/min, wet-out inspection must occur within 120 s of contact because low resin tack can allow slip between plies if the mandrel temperature exceeds 35 °C. For closed-loop resin bath systems, the resin inventory is limited to 5 L under continuous recirculation to prevent heat accumulation and a premature gel at the pickup roll.
Table 1 consolidates the quality-control values supplied for WWJF-8020 after a cure schedule of 24 h at 23 °C followed by 2 h at 80 °C. The values should be verified against the lot-specific certificate of analysis because filler content and cure protocol shift the properties by measurable margins. Tensile and flexural data are generated on cast plaques machined to standard test geometries, and the test speed is 1 mm/min for tensile modulus and 5 mm/min for tensile strength.
| Property | Test standard | Typical range | Unit |
|---|---|---|---|
| Mixed viscosity at 25 °C | ISO 3219:2021 | 800–1,400 | mPa·s |
| Gel time, 250 g mass at 25 °C | ISO 9514:2019 | 45–70 | min |
| Mixed density at 25 °C | ISO 1675:2022 | 1.08–1.12 | g/cm³ |
| Tensile strength | ISO 527-2:2012 | 58–66 | MPa |
| Tensile modulus | ISO 527-2:2012 | 2.6–3.1 | GPa |
| Elongation at break | ISO 527-2:2012 | 3.0–4.5 | % |
| Flexural strength | ISO 178:2019 | 95–115 | MPa |
| Flexural modulus | ISO 178:2019 | 2.8–3.3 | GPa |
| Glass transition temperature | ISO 11357-2:2020 | 75–85 | °C |
| Hardness | ISO 868:2003 | 82–86 | Shore D |
| Water absorption, 24 h at 23 °C | ISO 62:2008 | 0.15–0.25 | % |
The cured network is rated for continuous service up to 85 °C under dry conditions. Wet exposure above 60 °C accelerates moisture uptake and produces a plasticized state; immersion in water at 80 °C for 7 days can reduce the glass transition temperature by 8–12 °C. The resin is not formulated for continuous aqueous immersion above 60 °C or for contact with polar solvents such as methanol and acetone in stressed applications. Electrical insulation values measured on 2 mm cast plaques after dry post-cure give a volume resistivity of 1×1015 Ω·cm under IEC 62631-3-1:2023 and a dielectric strength of 18–22 kV/mm under IEC 60243-1:2013. These values are typical for unfilled DGEBA-based formulations and are not intended as material certification limits.
The coefficient of linear thermal expansion of WWJF-8020 below the glass transition temperature is 65–75 ppm/K under ISO 11359-2:2021. This places the system closer to cast aluminum than to steel, and joint design must accommodate thermal expansion mismatch when the resin is used as a structural adhesive on low-expansion alloys. The use of silane-primed interfaces and filled bond-line spacers is required where ambient thermal cycles exceed 40 °C peak-to-peak.
Compared with legacy DGEBA systems cured with unmodified aliphatic amines, WWJF-8020 shows lower mixed viscosity and reduced susceptibility to carbamation, but it does not match the thermal stability of anhydride-cured networks. The primary substitution considerations are obtained by comparing the cured-state properties of WWJF-8020 against those of the faster-curing WWJF-7015 and a flexible WWJF-6010 resin in the same product line. Table 2 sets out the distinctions relevant to production scheduling, coefficient of linear thermal expansion, and adhesion to aluminum and glass. The fast-curing WWJF-7015 achieves demold at 4–6 h at 23 °C, but its 250 g gel time is 18–25 min, which restricts its use in large-area infusion. WWJF-8020, by contrast, provides a 45–70 min gel time and is therefore preferred for laminates exceeding 4 m² when a single injection port is used. The flexible WWJF-6010 provides higher elongation at 12–15% but sacrifices tensile strength and glass transition temperature, making it suitable for potting compounds with high thermal-cycle demands but not for structural laminates requiring high modulus.
| Parameter | WWJF-8020 | WWJF-7015 | WWJF-6010 | Test standard |
|---|---|---|---|---|
| Mixed viscosity at 25 °C | 800–1,400 mPa·s | 350–600 mPa·s | 1,200–1,800 mPa·s | ISO 3219:2021 |
| Gel time, 250 g at 25 °C | 45–70 min | 18–25 min | 50–80 min | ISO 9514:2019 |
| Tensile strength | 58–66 MPa | 45–52 MPa | 28–35 MPa | ISO 527-2:2012 |
| Elongation at break | 3.0–4.5% | 1.5–2.5% | 12–15% | ISO 527-2:2012 |
| Glass transition temperature | 75–85 °C | 60–68 °C | 35–45 °C | ISO 11357-2:2020 |
| Best processing window | 25–35 °C | 20–30 °C | 25–40 °C | — |
The substitution of WWJF-8020 for a standard DGEBA resin in clear casting is generally process-compatible, but the optical clarity requirement demands careful control of moisture and bubble release. Because WWJF-8020 has a refractive index of approximately 1.54 after full cure, it matches soda-lime glass sufficiently for decorative embedding of glass fragments and LED encapsulant layers up to 10 mm thickness. However, extended UV exposure produces yellowing; the system is not specified for outdoor weathering without a UV-blocking topcoat. The color shift under indoor accelerated aging at 60 °C and 0.68 W/m² for 500 h is typically ΔE 2–4 by ISO 11664-4:2011, but published data for this specific configuration is limited and end-use approval must be based on component-level testing.
For structural bonding, surface preparation governs adhesion more than resin selection. Aluminum substrates should be degreased with a non-polar solvent, grit-blasted or chemically etched, and primed with a silane-based primer before application of WWJF-8020. Under lap-shear testing according to ISO 4587:2003, bonded aluminum coupons prepared with a chromic acid etch and silane primer typically fail in the substrate or show mixed-mode failure at 18–22 MPa, while unprepared surfaces may fall below 8 MPa due to boundary-layer contaminant failure. The actual value for WWJF-8020 on any given surface is strongly preparation-dependent, and the supplier does not publish a universal shear strength for unprimed metal.
Field data from production-scale dual-cartridge dispensing lines indicate that the resin component settles during storage; a 200 kg drum should be rolled for 30 min before use, and viscosity of the first 2 L drawn from an unshaken container can be 10–15% below the target value. When the filler is added, high-shear dispersion through a Cowles blade at 1,500–2,000 rpm for 15 min is required to achieve a Hegman gauge reading of 50 µm or finer. Avoid combination with amine-based accelerators beyond the supplied hardener ratio, because excess tertiary amine accelerates the cure ahead of the flow front and can generate localized gel particles in the mixing head.
Unlike moisture-curing polyurethane systems, WWJF-8020 does not rely on ambient humidity to initiate cure, which makes gel time less sensitive to seasonal humidity variation. Unlike UV-curable acrylic blends, WWJF-8020 develops full mechanical properties in shadowed areas of a bond line or laminate because cure is thermal rather than photoinitiated. These differences are relevant when a production line moves from open-face bonding to closed-mold infusion, where light access is limited and moisture control can vary across shifts.
Unopened components stored in dry conditions at 10–30 °C have a supplier-stated shelf life of 24 months. The resin component should not be stored below 5 °C because crystallization of DGEBA oligomers can occur. If chilled, restore at 30 °C for 24 h before use and mix thoroughly. The hardener is moisture-sensitive and should be consumed within 6 months after opening. Do not return unused hardener from a working container to the original drum, because the working container atmosphere may have introduced enough water to reduce gel time by 10–15%.
For regulatory submissions, the resin component and hardener should be accompanied by a lot-specific REACH SVHC declaration and a RoHS recast 2011/65/EU Annex II screening report. Unless explicitly stated in the supplier certificate, WWJF-8020 does not carry a general FDA 21 CFR 175.300 food-contact letter, and use in indirect food-contact coatings must be validated against the intended food type, temperature, and contact duration. No Substance of Very High Concern is intentionally added above 0.1 wt%.
