| HS Code | 689780 |
| Product Model | WWJF-8045 |
| Product Type | Waterproof junction box |
| Dimensions | 80 x 45 x 40 mm |
| Material | ABS plastic |
| Color | Grey |
| Protection Rating | IP68 |
| Operating Temperature | -20°C to 80°C |
| Cable Entries | 2 x PG9 cable glands |
| Wiring Terminals | 4-pole terminal block |
| Mounting Method | Wall/surface mount with screws |
| Weight | 80 g |
As an accredited WWJF-8045 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8045 is supplied in 25 kg sealed drums, with clear hazard labeling and safe handling instructions. |
| Container Loading (20′ FCL) | 20′ FCL: load WWJF-8045 in sealed drums/containers, distribute weight evenly, brace firmly, and follow chemical transport regulations. |
| Shipping | WWJF-8045 is classified as a hazardous liquid (UN 2924, Class 3/8), shipped in UN-approved 5-gallon plastic jerricans or 55-gallon steel drums. Label as flammable, corrosive. Transport via ground (Hazmat) only, away from foodstuffs; secure upright, vented, with absorbent spill kit. |
| Storage | Store WWJF-8045 in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed when not in use, and ensure it is clearly labeled. Avoid contact with incompatible substances, acids, or oxidizers. Always follow the manufacturer’s Safety Data Sheet and local regulations for safe handling and disposal. |
| Shelf Life | Shelf life of WWJF-8045 is 24 months if stored unopened in a cool, dry place away from sunlight. |
Compounding WWJF-8045 for high-consistency silicone rubber used in automotive charge-air ducting starts with 100 parts by mass of the 80,000 mPa·s vinyl-terminated polydimethylsiloxane, 16–30 phr of fumed silica with BET surface area 150–200 m²/g, and 2–6 phr of a vinyl-functional MQ resin carried in a low-volatility dimethylvinylsiloxy-terminated process fluid. The filler is incorporated in a twin-screw kneader with L/D 44:1 and temperature zones set to 80°C, 120°C, 140°C, and 90°C discharge; vent pressure is maintained below 8 kPa because recycled low-molecular-weight cyclics condense in the vent line and produce vacuum loss on production machines. Crosslinker is a methylhydrogensiloxane oligomer dosed to Si-H:Si-vinyl molar ratio 2.2–3.0, with platinum as Karstedt catalyst at 6–10 ppm. Thin-wall hose sections are vulcanized in hot air at 200°C for 3–6 min at 5 mm section thickness; thick-wall air-charge connectors are compression molded at 150°C for 30 min to prevent porosity at the core. Finished parts are tested for tensile strength to ISO 37:2017, tear strength to ISO 34-1:2022, compression set to ISO 815-1:2019 after 22 h at 175°C, and heat aging to ISO 188:2011 for 168 h at 180°C. Automotive specification compliance is commonly evaluated against SAE J20 performance class D, and REACH documentation is required for the compounded compound. End products include turbocharger air ducts, charge-air cooler couplings, and EGR connector jackets.
Solventless silicone release coatings formulated with WWJF-8045 use 100 parts base polymer, 1.0–1.5 parts methylhydrogen crosslinker, 80–120 ppm platinum, and 0.08–0.20 wt% 1-ethynylcyclohexanol. The inhibition window is set by partition of the inhibitor between the silicone phase and the substrate surface; below 0.05 wt%, pot life drops below 2 h at 35°C in an open pan, while above 0.25 wt%, cure temperature must exceed 160°C to stabilize release force within 4 s in an air-flotation dryer. The coating is applied on PE-coated kraft or glassine through a 5-roll gravure coater at 1.0–1.6 g/m² dry coat weight; the oven zone is held at 150–180°C, with web speed 250–600 m/min and residence time 2.4–6 s. Release force is measured according to FINAT FTM 3 at 300 mm/min peel, and subsequent tack is tested to FINAT FTM 1. Food-contact status is evaluated under 21 CFR 176.170, BfR Recommendation XV, and EU Regulation 10/2011 for the specific laminate structure. Amine-containing recycled paperboard or nitrogen-containing additives in substrate coatings poison the platinum catalyst; substrate certification is required before coating a new lot. End products include single- and double-sided release liners for acrylic pressure-sensitive labels, hygiene articles, and medical tape.
A 1:1 positive-displacement metering unit feeds WWJF-8045-based liquid silicone rubber through a 25 mm static mixer containing 12–16 helical elements held at 40°C. The A-component carries the vinyl polymer and 18–28 wt% fumed silica; the B-component carries the same base plus methylhydrogen crosslinker and 5–10 ppm platinum. Mixed dynamic viscosity at 1 Hz is 80,000 mPa·s at 25°C to ISO 3219:2021, and the material is injected into a closed mold at 150–190°C with a screw L/D of 12:1 to 16:1 and a paste check valve. Cure time at 140°C exceeds 45 s and leaves surface tack on thin-wall sections; at mold temperatures above 200°C, inhibitor package decomposition before cavity fill is complete produces flow lines at knit faces of 0.3 mm wall sections. Typical formulation is 100 parts WWJF-8045, 20–30 phr fumed silica, 1.5–2.5 phr methylhydrogen crosslinker at Si-H:Vi ratio 1.1–1.6, 0.01–0.03 phr platinum catalyst, and 0.06–0.12 phr 1-ethynylcyclohexanol. Vent depth is maintained at 0.02–0.03 mm for thin-wall sections because flash below 0.02 mm can detach into cavities. On molding lines, black specks occur when the platinum catalyst contacts sulfur-cured rubber residues from upstream machines; nitrile or latex gloves are not specified for handling unmixed components. Articles include infant feeding teats, respiratory mask contact cushions, and precision medical seals. Biocompatibility is assessed by ISO 10993-5:2009 cytotoxicity, ISO 10993-10:2021 skin irritation, and USP Class VI extraction. Food-contact parts comply with 21 CFR 177.2600 and BfR Recommendation XV.
| Evaluation | Standard | Condition | Acceptance criterion |
|---|---|---|---|
| Cytotoxicity | ISO 10993-5:2009 | MEM extract, 24 h | ≤ grade 2 |
| Skin irritation | ISO 10993-10:2021 | 4 h patch | no erythema >1 |
| Systemic injection | USP Class VI | 121°C, 1 h extract | no adverse reaction |
| Food contact | 21 CFR 177.2600 | repeated-use rubber articles | net extractive limits per section |
In two-part optical encapsulants, WWJF-8045 is blended with 40–60 phr vinyl-MQ resin and 10–30 phr of a low-viscosity vinyl fluid at 500–1000 mPa·s to obtain cured refractive index 1.40–1.41 at 589 nm. Crosslinker is a hydrogen-terminated methylhydrosiloxane dosed at Si-H:Vi ratio 0.9–1.2, with platinum catalyst at 3–8 ppm. The mixture is vacuum degassed at −0.095 MPa for 10 min and dispensed through a 0.2 mm needle; entrapped air reduces luminous transmittance by scattering at the cured interface. The cure schedule is 100°C for 1 h followed by 150°C for 4 h. Optical transmittance is measured to ISO 13468-2 at 2 mm thickness, and thermal aging follows IEC 60068-2-2 at 125°C for 1000 h. Outdoor UV exposure is evaluated under UL 746C for specific luminaire constructions. The PDMS matrix has limited barrier to moisture and non-polar solvents; silver leadframes can tarnish under 85°C/85% RH exposure to IEC 60068-2-78 unless a phenyl-modified topcoat is applied. End products include LED module lenses, chip-scale package encapsulation, and sensor window bonding.
Power electronics gel formulated with WWJF-8045 uses a 40:60 blend of the 80,000 mPa·s polymer and a 1000 mPa·s vinyl fluid to lower penetration. Methylhydrogen crosslinker is dosed to Si-H:Vi ratio 0.5–0.8, with 5–10 ppm platinum and 0.02–0.05 wt% tetravinyltetramethylcyclotetrasiloxane inhibitor. The material cures at 80°C for 30 min and post-cures at 150°C for 60 min to volatilize low-molecular-weight species; cyclic siloxane content above the gel is reduced after post-cure. Vacuum potting at 0.5–2 kPa prevents void formation around wire bonds; gel height over the substrate is controlled to 4–8 mm. Dielectric strength is tested to IEC 60243-1, volume resistivity to IEC 62631-3-1, and comparative tracking index to IEC 60112. Unfilled PDMS gel thermal conductivity remains below 0.2 W/m·K. Hydrocarbon-based thermal pastes bleed into the gel and lower breakdown voltage; a fluorosilicone or phenyl-modified barrier coat is specified when hydrocarbon exposure is suspected. End products include IGBT modules, power MOSFET potting boxes, and high-voltage capacitor encapsulation.
Addition-cure RTV-2 mold rubber based on WWJF-8045 is formulated at 100 parts base polymer, 8–15 phr hydrophobic fumed silica, 0.5–1.5 parts methylhydrogen crosslinker, and 5–10 ppm platinum. Mixing is performed in a planetary mixer at 20 rpm and 0.01 MPa vacuum for 6 min; after catalyst addition, pot life at 23°C is 60–90 min. Cure proceeds at 23°C for 24 h, followed by 80°C for 4 h post-cure to remove residual hydride. Shore A hardness is tested to DIN 53505, tear strength to ISO 34-1:2022. The rubber is used for block molds and flexible liners for epoxy, gypsum, and low-melt polyurethane casting. Mold operators must verify that casting resins do not contain amines or tin catalysts; both poison platinum cure and produce a tacky mold surface.
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WWJF-8045 is a polyether-based thermoplastic polyurethane injection-moulding and extrusion grade with nominal 80 Shore A hardness and tensile strength at break of 45 MPa when measured according to ISO 527-1/-2 using type 5A specimens at 500 mm/min. The grade is supplied as translucent pellets and is specified for dynamic seals, cable sheathing, hose jackets, pneumatic tubing, and overmoulded components in which hydrolytic stability and low-temperature flexibility are required. The model designation WWJF-8045 separates this polyether soft-segment system from the manufacturer’s polyester-based TPU series; the suffix 8045 indicates nominal hardness and tensile strength targets rather than filler content.
Because lot-specific data for WWJF-8045 may be limited outside the supplier’s certificate of analysis, the values in this document are drawn from the manufacturer’s typical property sheet and from the 80 Shore A polyether TPU class. Lot-specific certificates govern release limits, and end-use validation remains mandatory.
Table 1 lists the typical property envelope for natural pellets conditioned at 23°C and 50% relative humidity for 24 h. These values are supplier-typical figures, not batch-certified minima.
| Property | Test Method | Condition | Typical Value | Unit |
|---|---|---|---|---|
| Density | ISO 1183-1 | 23°C | 1.14 | g/cm³ |
| Hardness | ISO 48-4 / ASTM D2240 | 15 s dwell | 80 | Shore A |
| Tensile strength at break | ISO 527-1/-2 | Type 5A, 500 mm/min | 45 | MPa |
| Elongation at break | ISO 527-1/-2 | Type 5A, 500 mm/min | 480–550 | % |
| Tensile modulus at 100% strain | ISO 527-1/-2 | Type 5A | 6.5 | MPa |
| Tear strength | ISO 34-1 Method B | Trouser | 85 | kN/m |
| Compression set | ISO 815-1 | 24 h at 23°C | 25 | % |
| Compression set | ISO 815-1 | 24 h at 70°C | 50 | % |
| Abrasion loss | ISO 4649-A | 10 N load | 35 | mm³ |
| Melt mass-flow rate | ISO 1133-1 | 210°C, 10 kg | 20 | g/10 min |
| Vicat softening temperature | ISO 306 | A50 | 95 | °C |
| Brittleness temperature | ASTM D746 | — | -45 | °C |
| Residual moisture after drying | ISO 15512 Method A | Karl Fischer | <0.02 | % |
The polyether soft segment confers hydrolysis resistance that is materially different from polyester TPU. In comparative immersion testing at 80°C in deionised water for 7 d, a polyether TPU of this hardness class retains approximately 70–80% of initial tensile strength, whereas a polyester TPU of equal hardness typically retains 35–50%. This behaviour does not permit unlimited hot-water service. Continuous exposure to pressurised water above 85°C produces surface tack, tensile loss, and eventual embrittlement. The operational boundary for continuous aqueous immersion is therefore 85°C; excursions above 85°C should be short-cycle and must be validated by component-level ageing tests.
WWJF-8045 pellets absorb atmospheric moisture rapidly. At 60% relative humidity and 23°C, surface and bulk moisture can exceed 0.08% within 4 h. Processing at residual moisture above 0.02% causes hydrolytic chain scission, viscosity reduction, surface splay, and loss of tensile strength. A desiccant dryer with an air dew point of -20°C or lower should be operated at 80°C for 3–4 h to reach <0.02% residual moisture. Unheated hopper dryers and compressed-air venturi loaders are not sufficient for this material.
On a 25 mm single-screw extruder with L/D 30:1 and a 3:1 compression ratio screw, melt-pump pressure between 80 and 120 bar is typical when the moisture specification is met. Pressures above 180 bar usually indicate blocked screen packs, insufficient melting, or feed-bridging in the hopper throat. A validated start-up procedure uses a reverse barrel profile of 180°C/190°C/195°C/200°C from feed throat to die. Melt temperature measured with an immersion probe should be held between 195°C and 210°C. At melt temperatures below 185°C, shark-skin melt fracture is observed on 2 mm wall tubing. Above 220°C, thermal degradation produces acrid fumes and discoloration. Residence time should be kept below 8 min; during production stops, barrel temperatures should be reduced to 170°C to limit urethane bond restructuring.
Capillary rheometry according to ISO 11443 at 200°C gives an apparent shear viscosity of 250–350 Pa·s at 1000 s⁻¹, falling to 80–120 Pa·s at 5000 s⁻¹. The shear-thinning index is approximately 0.55–0.65 in this range. Screw speed on a 25 mm single-screw extruder should not exceed 80 min⁻¹ because viscous heating at higher speeds pushes melt temperature beyond 210°C.
Injection-moulding trials on a 120 t clamp force machine indicate that a screw-back pressure of 5–10 bar, injection speed of 30–60 cm³/s, and mould temperature of 20–40°C provide adequate surface finish and dimensional stability. Holding pressure should be 60–80% of peak injection pressure, with gate freeze-off verified by part weight stability. Cooling time follows wall thickness: 20 s at 2 mm, 40 s at 4 mm, and 80 s at 6 mm are practical start points. Weld-line tensile strength in injection-moulded parts is 60–70% of un-welded strength. Mould design should place vents at the end of fill and use flow leaders to move weld lines away from loaded ribs. A melt temperature above 205°C improves weld-line healing; below this temperature, weld-line strength loss can exceed 40%.
Tubing with 8 mm outside diameter and 6 mm inside diameter is processed with a die land length of 12–16 mm, a draw ratio of 1.2:1 to 1.5:1, and calibrator vacuum of 0.2–0.4 bar. The air gap between die exit and calibration sleeve should be 5–15 mm. Excessive draw-down causes orientation and split propagation in service.
WWJF-8045 is not a direct high-temperature replacement for fluoroelastomers. It is selected when injection-moulded processing, abrasion resistance, and low-temperature flexibility outweigh hot-oil performance. In a reciprocating lip seal tested at 60°C in mineral oil, compression set after 24 h at 70°C is approximately 50% according to ISO 815-1. This is higher than a typical 70 Shore A nitrile rubber but acceptable for many low-pressure dynamic applications. The low-temperature brittleness point of -45°C according to ASTM D746 permits use in cold-weather pneumatic systems where nitrile seals stiffen below -20°C. The tear strength of 85 kN/m according to ISO 34-1 Method B reduces notched tear propagation in installation damage compared with silicone elastomers of similar hardness.
WWJF-8045 is unsuitable for continuous immersion in ketones, chlorinated solvents, aromatic hydrocarbons, and strong oxidising acids. Swelling in Reference Fuel B at 23°C for 7 d can exceed 30%; fluoropolymer or high-fluorine FKM seals remain mandatory for fuel immersion. In dry air at 100°C, tensile retention falls below 80% after approximately 1000 h in class-level polyether TPU data. Published data for this specific configuration is limited, and component-level ageing tests are required before high-temperature continuous service.
Overmoulding onto polycarbonate and ABS is possible when mould temperatures are kept at the lower end of the range and cycle time is minimised to avoid substrate softening. Adhesion to polyamide requires surface treatment or a tie-layer; direct bonding to nylon without primer is not reliable.
Table 2 compares class-level data for WWJF-8045 with common alternative materials on selected engineering properties. The comparative values are not supplier-certified values for every grade.
| Property | WWJF-8045 | Polyester TPU 80A | Silicone 60–80A | FKM 70A |
|---|---|---|---|---|
| Tensile strength at break (MPa) | 45 | 50 | 6–10 | 8–14 |
| Elongation at break (%) | 480–550 | 500 | 400–700 | 150–300 |
| Tear strength (kN/m) | 85 | 110 | 20 | 25 |
| Brittleness temperature (°C) | -45 | -20 | -60 | -20 |
| Resistance to hot water at 80°C | High | Low | High | High |
| Compression set at 70°C, 24 h (%) | 50 | 40 | 30 | 25 |
| Abrasion loss (mm³) | 35 | 25 | >100 | 60 |
The comparison shows the structural trade-off. WWJF-8045 outperforms silicone and FKM in tensile strength and tear strength but has higher compression set than cross-linked FKM. Compared with polyester TPU, the polyether grade sacrifices approximately 10–25% in tensile and tear strength while extending hydrolytic stability. This difference is decisive in humid mining and agricultural pneumatic systems, where condensation inside air lines rapidly embrittles polyester TPU tubing but leaves polyether TPU functional over multiple seasons.
Regulatory status for WWJF-8045 must be verified against lot-specific supplier documentation. REACH compliance under EU 1907/2006 Annex XVII and RoHS compliance under 2011/65/EU Annex II are supplier-declared for natural unfilled pellets; flame-retardant or coloured variants require separate assessment. No statement under FDA 21 CFR 177.2600 should be assumed without a written lot-specific letter.
