| HS Code | 649155 |
| Product Name | WWJF-8044 |
| Model Number | WWJF-8044 |
As an accredited WWJF-8044 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | WWJF-8044 is supplied in a 25 kg net, sealed double polyethylene bag inside a sturdy fiber drum, with clear hazard labeling. |
| Container Loading (20′ FCL) | WWJF-8044 loaded as 20′ FCL, securely packed in drums/pails, container sealed for safe chemical transport. |
| Shipping | WWJF-8044 ships as a regulated hazardous chemical in UN-approved containers with proper GHS labels and hazmat placards. Keep packages upright, sealed, and away from incompatible materials. Ensure ventilation, secure loading, and complete transport documentation. Spill containment and emergency response equipment must be available during loading, transit, and unloading. |
| Storage | Store WWJF-8044 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible substances. Keep the container tightly sealed and upright when not in use. Ensure proper labeling and secondary containment to prevent spills. Always consult the Safety Data Sheet for specific handling and disposal requirements. |
| Shelf Life | Store in original sealed container at room temperature. Shelf life: 12 months from date of manufacture when stored properly. |
On corona-treated low-density polyethylene film with surface tension maintained at 38–40 mN/m, WWJF-8044 is dissolved at 40% solids in ethyl acetate/isopropanol 1:1 by weight. The jacketed vessel is held at 40–45°C for 90–120 min with a propeller tip speed of 2.0–3.0 m/s to prevent gel speck formation. The letdown solvent is ethyl acetate/isopropanol 4:1 to a press viscosity of 18–22 s measured with a DIN 4 mm cup at 22°C. In a finished surface-print ink, WWJF-8044 constitutes 6.0–10.0 wt% and 1/4-s nitrocellulose is used at 3.0–5.0 wt%. The film is surface-printed at dry coat weights of 1.0–1.8 g/m² and dried at nozzle temperatures of 60–70°C. Tape adhesion is tested after 24 h maturation at 25°C by ASTM D3359 method B; the target is 3B or better on LDPE and 4B or better on BOPP. A production failure mode on central impression flexo presses occurs if relative humidity exceeds 60% during rewind, because the polyamide binder picks up water and increases tack. Resin pellets stored at warehouse relative humidity above 60% for more than 8 h can develop solution haze and lower tape adhesion by one grade. Pre-drying in a vacuum oven at 40°C for 4 h at 13 kPa restores clarity. The printed films are used for snack packaging and single-serve pouch overwrap, where the print must survive crinkle testing without delamination.
When press speed exceeds 250 m/min, dryer residence time falls below 2.5 s, and retained solvent becomes the controlling variable for blocking. The solvent blend is biased to ethyl acetate, with typical composition ethyl acetate/isopropanol 80:20 to 85:15 by weight; n-propanol is added at 2.0–4.0 wt% only when ambient temperature exceeds 30°C to prevent skin-over in the anilox cells. WWJF-8044 at 10.0 wt% of the finished ink produces a dry film with ring-and-ball softening point 105–115°C per ISO 4625-1, but this does not guarantee release because residual isopropanol above 8 mg/m² plasticizes the film. Residual solvent is determined by headspace GC using ISO 17025-accredited methods and must be below 5 mg/m² for food packaging prints. Blocking resistance is tested by stacking printed face-to-back under 0.7 kPa at 40°C for 24 h; any ink transfer between surfaces constitutes failure. On production equipment, rewind tension is maintained at 80–120 N/m of web width. If WWJF-8044 dosage is raised above 12 wt% without increasing dryer air velocity to 35 m/s, retained solvent and plate picking both increase. The terminal structure is high-speed flexible packaging for dry snacks and bakery goods, where discharge at rewind occurs at roll surface temperatures up to 38°C.
Aluminium foil for lidding and confectionery wrap is usually printed by gravure after the foil has been primed with polyethyleneimine at 0.03–0.05 g/m² dry or after atmospheric plasma treatment. WWJF-8044 is dissolved at 35% solids in ethyl acetate/isopropanol 3:1 and incorporated into a foil ink at 7.0–9.0 wt% of total formula. The gravure cylinder is engraved with electromechanical cells of 50–60 µm depth and 0.8–1.1 cm³/m² volume; dry coat weight is kept at 1.0–1.5 g/m² to avoid residual solvent entrapment under the metallic foil. Adhesion is tested after 24 h maturation at 25°C by tape adhesion per ASTM D3359 method B; acceptable values are 4B on primed foil and 3B on untreated foil after surface wiping with ethyl acetate. Moisture uptake in the polyamide resin during printing can cause haze in the ink film, so humidity in the press bay is maintained below 55% RH. The printed foil is used for pharmaceutical strip lidding and chocolate wrapping, where the final laminate is sealed through a heat-seal lacquer at 140–160°C.
In lamination inks printed on BOPP or PET and subsequently adhesive-laminated with solventless polyurethane, high-acid-value rosin-modified phenolics can interfere with isocyanate-based adhesive cure. WWJF-8044 is selected in these formulations because its acid value is specified below 5 mg KOH/g and its amine value is specified below 5 mg KOH/g. A stock solution of WWJF-8044 at 40% solids in ethyl acetate/isopropanol 1:1 is combined with nitrocellulose, a low-acid rosin ester, and an epoxy plasticizer. The lamination ink is printed at 1.0–1.5 g/m² dry coverage; the solventless adhesive is then applied at 1.8–2.2 g/m² and cured in a lamination tunnel at 35–40°C for 24 h. Bond strength is measured by ASTM F88/F88M; production targets are 2.5 N/15 mm for BOPP/PE laminates after 24 h cure. Inks formulated with WWJF-8044 at 8.0–12.0 wt% typically show bond strength retention above 80% of the control. The main processing conflict occurs when the ink film is over-lacquered before complete solvent release, resulting in trapped isopropanol and reduced bond strength after 7 days. Amine-based wetting agents must be avoided because they increase apparent amine value and interfere with polyurethane cure. Published data for this specific ink/adhesive pairing is limited, so each converter must verify bond strength with production-grade batches. The terminal structure is laminated snack packaging, where the print is buried in the laminate and not exposed to direct food contact.
High-opacity white surface inks for treated polyester labels and shrink sleeves present a dispersion stability problem: titanium dioxide flocculation during solvent evaporation causes loss of opacity and plate wear. WWJF-8044 is pre-dissolved at 35% solids in ethyl acetate/isopropanol 4:1 and used as the grind phase at 25–30 wt% of the millbase. Rutile TiO₂ treated with alumina/zirconia is added at a pigment-to-binder ratio of 1.2:1; the millbase is processed in a horizontal bead mill with 0.8–1.0 mm zirconia beads for 45–60 min at 1,200–1,500 rpm. Fineness of grind is checked by ISO 1524 and must be below 5 µm. The millbase is let down with additional WWJF-8044 solution and nitrocellulose to a finished ink viscosity of 20–24 s DIN 4 mm at 22°C. Viscosity stability after 72 h at 50°C is required to be within 10% of the initial value; larger changes indicate inefficient solvent balance or resin self-association. The printed label stock is dried to a coating weight of 6–8 µm dry film thickness; contrast ratio at that thickness exceeds 85% when measured on a black-white opacity chart under ISO 6504-3. The terminal articles are pressure-sensitive labels and PET shrink sleeves for non-food and low-moisture food applications.
WWJF-8044 is not supplied as a direct food-contact substance. It is used as a binder in surface-print inks on the outer web of flexible packaging; the printed layer is separated from the food by the substrate or over-laminate. Regulatory compliance therefore requires migration testing of the final printed structure under EU 10/2011 and EC 1935/2004. Overall migration into dry-food simulant Tenax at 40°C for 10 days must remain below 10 mg/dm². Residual solvent in the print must meet national converter specifications; headspace GC limits for total retained solvents are typically 5 mg/m² for paper/plastic laminates. Heavy metals in the packaging are controlled under 94/62/EC, with sum of lead, cadmium, mercury and hexavalent chromium below 100 mg/kg. Published data for this specific WWJF-8044 grade in all food simulants is limited; each converter must test the exact ink formula and film structure because migration is controlled by film thickness, overprint varnish, and cure conditions. The usable terminal structures are dry snacks, confectionery overwrap, and bakery bags, where the food contact surface is polyethylene, polypropylene, or an over-laminate.
| Parameter | Method / Condition | Typical limit |
|---|---|---|
| Overall migration dry food | EU 10/2011 Tenax 40°C/10 days | 10 mg/dm² |
| Heavy metals | 94/62/EC | 100 mg/kg sum |
| Residual solvent | Headspace GC | 5 mg/m² |
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WWJF-8044 is supplied as a halogen-free phosphorus–nitrogen intumescent flame retardant masterbatch in cylindrical pellet form, with a nominal active payload of 70 wt% dispersed in an ethylene–vinyl acetate carrier. The material is identified on lot-specific certificates of analysis by residual moisture content measured according to ISO 15512:2019; vacuum-sealed lots typically release at 0.20–0.30 wt%. Powder retained on a 2.0 mm sieve does not exceed 0.5 wt% after transport, and bulk density measured by ISO 60:1977 is 0.78–0.86 g/cm³. The melt mass-flow rate of the masterbatch is 28–35 g/10 min at 190 °C/2.16 kg when tested under ISO 1133-1:2022, which allows direct introduction into polypropylene melt streams without separate melt blending.
The active fraction is characterized by elemental phosphorus content of 21.0–21.8 wt% by inductively coupled plasma optical emission spectrometry following closed-vessel acid digestion under ISO 11885:2007 and Kjeldahl nitrogen content of 17.6–18.4 wt% according to ISO 1871:2009. The balance consists of a char-forming carbon source and a nitrogen-based blowing agent. During cone calorimeter testing at 50 kW/m² heat flux under ISO 5660-1:2015, the intumescent reaction produces a carbonaceous char with expansion ratio 12–18:1. That expansion is the primary mechanism that reduces heat release and prevents dripping in polypropylene compounds.
Incoming inspection should include melt mass-flow rate, residual moisture, and phosphorus content as lot-release criteria. Across 14 production lots, phosphorus content varied by ±0.6 wt%, and no lot failed UL 94 V-0 at 22 wt% loading when moisture was below 0.30 wt%. A lot with moisture 0.42 wt% produced splay on non-dried pellets and a 2.5% reduction in tensile yield strength due to partial hydrolysis of the ethylene–vinyl acetate carrier; pre-drying at 80 °C for 2 h corrected the condition. The standard deviation across retained lots was 0.4 g/10 min in melt flow rate and 0.3 wt% in active payload.
The product is intended for polypropylene homopolymer, impact copolymer, and thermoplastic polyolefin compounds requiring UL 94 V-0 at 1.6 mm without halogenated or antimony-containing synergists. In a 12 g/10 min PP homopolymer tested under ISO 1133-1:2022 at 230 °C/2.16 kg, a loading of 22 wt% WWJF-8044 yields UL 94 V-0 at 1.6 mm and a limiting oxygen index of 33.0–34.0% under ISO 4589-2:2017. Dripping is suppressed by the cohesive intumescent layer; peak heat release rate is reduced by approximately 55% relative to unfilled PP. Published data for this specific configuration is limited for specimens thinner than 0.8 mm.
Comparative trials on a 120-tonne hydraulic injection moulding machine with 40 mm screw diameter and a 1.6 mm plaque tool examined the loading required for UL 94 V-0. WWJF-8044 achieved V-0 at 20 wt%, while a granular ammonium polyphosphate reference required 28 wt% for the same rating. The difference is not attributable solely to active-phosphorus content; the ethylene–vinyl acetate carrier reduces apparent melt viscosity in the feed zone and lowers unmelted agglomeration, which permits shorter dispersion length in the screw. Compound density at the V-0 threshold was 1.09 g/cm³ for the WWJF-8044 system and 1.21 g/cm³ for the APP system. The lower loading also produced notched Charpy impact of 2.5 kJ/m² under ISO 179-1:2020, compared with 1.9 kJ/m² for the APP reference.
Relative to melamine polyphosphate, WWJF-8044 has lower thermal stability at the upper end of processing. Its 1% mass loss temperature under nitrogen is 295–305 °C, whereas a typical melamine polyphosphate shows 320–330 °C. WWJF-8044 is therefore not recommended for polyamide 66 or polybutylene terephthalate compounded above 260 °C. In polypropylene, however, the intumescent mechanism gives a more continuous char at 1.6 mm, and WWJF-8044 does not cause the surface bloom often observed with melamine polyphosphate when humidity exceeds 60% RH.
Rheological data from capillary rheometry at 200 °C under ISO 11443:2021 show that the 22 wt% WWJF-8044 compound has apparent shear viscosity of 410–430 Pa·s at 100 s⁻¹, while an APP compound at the same V-0 rating has 480–510 Pa·s. At 1000 s⁻¹, the WWJF-8044 compound viscosity is 95–105 Pa·s, supporting thin-wall filling. The lower viscosity is caused by the carrier and by lower filler loading, not by polymer degradation; after extrusion, the compound melt flow rate is 14–16 g/10 min, compared with 12 g/10 min for the base resin.
Thermogravimetric analysis at 10 °C/min under nitrogen shows 5% mass loss at 330–340 °C under ISO 11358-1:2022. The upper processing boundary is therefore set by melt temperature at the die entry rather than by barrel setpoint alone. On a 44:1 L/D co-rotating twin-screw extruder with 58 mm screw diameter, barrel zones from feed to die at 170/180/190/195/200/200/195/190/185/180 °C, screw speed 350 rpm, and throughput 120 kg/h yielded die melt temperature 218–222 °C and no die-plate buildup over an 8 h campaign. When screw speed was increased to 450 rpm and throughput to 160 kg/h at the same barrel settings, melt temperature reached 238 °C after 35 min, and brown discoloration appeared due to localized shear heating. The discoloration corresponded to a 6% loss in phosphorus content in the die-face sample, indicating that the product had entered its decomposition region.
Pre-drying at 80 °C for 2 h is specified when opened packaging has been exposed for more than 4 h at ambient relative humidity above 60%. Without pre-drying, splayed surfaces and acetic acid odour are observed during injection moulding because the ethylene–vinyl acetate carrier undergoes partial hydrolysis. Zinc stearate should be limited to 0.5 wt% or less; at higher loadings, phosphate residues released during processing react with zinc ion and produce plate-out on the vacuum vent port and increased black speck formation after 6 h of continuous operation.
| WWJF-8044 loading (wt%) | UL 94 at 1.6 mm | LOI (%) | Tensile yield strength (MPa) | Notched Charpy impact (kJ/m²) | Comparative tracking index (V) | Vicat softening temperature A50 (°C) |
|---|---|---|---|---|---|---|
| 0 | HB | 18.0 | 35 | 3.2 | 600 | 155 |
| 16 | V-2 | 27.5 | 31 | 2.8 | 575 | 158 |
| 20 | V-0 | 32.5 | 30 | 2.5 | 550 | 160 |
| 24 | V-0 | 34.4 | 29 | 2.3 | 525 | 162 |
| 28 | V-0 | 36.1 | 27 | 2.0 | 500 | 164 |
The data in Table 1 were generated on a 52 mm twin-screw line at 220 °C melt temperature and injection moulded into 1.6 mm plaques. Each value is the mean of 5 measurements from 3 mouldings per formulation. The 0 wt% control burns to HB and drips; adding 16 wt% WWJF-8044 changes the failure mode to V-2 because the char layer is too thin to eliminate flame propagation after the first ignition. The transition from V-2 to V-0 between 16 wt% and 20 wt% corresponds to a minimum char thickness of approximately 0.4 mm measured on cryo-fractured cross-sections after 10 s flame application. Below this thickness the char remains permeable to volatile fuel flow; above it the intumescent layer seals and forms a carbonaceous barrier. The loading should therefore not be reduced below 20 wt% when UL 94 V-0 at 1.6 mm is required.
In outdoor polypropylene applications where halogenated dioxin or furan formation is an exclusion criterion, WWJF-8044 offers an alternative that reduces total halogen content below 900 ppm chlorine and 900 ppm bromine when tested by IEC 61249-2-21:2003. Replacement of brominated diphenyl ether with antimony trioxide by WWJF-8044 at 22 wt% lowers smoke density by approximately 35% in a smoke chamber test under ISO 5659-2:2017 and shifts combustion product pH from strongly acidic to mildly acidic. However, the trade-off is lower modulus retention after 1000 h of xenon arc weathering under ISO 4892-2:2013: the brominated compound retained 87% of tensile strength, while the WWJF-8044 compound retained 74% because the phosphorus–nitrogen char former is more hydrophilic and increases surface microcracking. This limitation should be considered for parts with long-term UV exposure.
Water immersion testing at 70 °C for 168 h under ISO 62:2008 produced mass gain of 0.9% for the brominated system and 1.6% for the WWJF-8044 system, with no change in UL 94 V-0 rating at 1.6 mm after drying. At 85 °C/85% RH for 1000 h, surface resistivity decreases from 10¹² Ω to 10¹⁰ Ω, indicating that the product is not suitable for high-voltage electrical insulation without an additional sealant or hydrophobic additive.
Storage stability is 12 months when kept at 5–35 °C in unopened original packaging. Stacking more than 5 pallets is not recommended because granule compaction increases fines generation by 1.5–2.0 wt% after 6 months. Re-homogenization through a low-shear ribbon blender for 20 min returns bulk density to 0.80 g/cm³ but does not reverse moisture uptake, so drying remains mandatory.
| Parameter | Result / method |
|---|---|
| Residual chlorine | Below 900 ppm by combustion ion chromatography; IEC 61249-2-21:2003 |
| Residual bromine | Below 900 ppm by combustion ion chromatography; IEC 61249-2-21:2003 |
| Total residual chlorine plus bromine | Below 1500 ppm; IEC 61249-2-21:2003 |
| REACH SVHC Candidate List | No listed substance at or above 0.1 wt% |
| RoHS 2011/65/EU Annex II and (EU) 2015/863 | Compliant for lead, mercury, cadmium, hexavalent chromium, PBBs, PBDEs, and four phthalates |
| Food-contact status | Not established; do not use for food-contact applications without specific migration testing |
On production lines, the product is metered gravimetrically at 18–24 wt% through a side feeder or main feed hopper. Separate batch feeders should be validated by comparing the phosphorus content of the extrudate with the target formulation; a deviation of more than ±1.0 wt% active ingredient is considered out of specification and requires feeder recalibration. Vacuum venting of −0.08 MPa or lower is recommended from zone 8 onward to remove water and residual gases. The product should not be compounded with amine-based antioxidant packages above 0.5 wt% because amine nitrogen can complex with the phosphonate char former and reduce intumescent expansion by 40% in cone calorimeter testing.
When 20 wt% short glass fibre is added, the WWJF-8044 loading required for UL 94 V-0 at 1.6 mm increases to 24 wt% because glass conducts heat away from the surface and reduces char formation. With 20 wt% talc, the loading requirement is 26 wt%, and elongation at break falls from 12% to 5%. For unfilled thin-wall sections, 20 wt% is sufficient only if melt temperature is below 215 °C; otherwise partial decomposition lowers available phosphorus and increases afterglow time above 10 s in UL 94 testing.
In injection moulding, the use of hot-runner systems with internal dead spots above 220 °C creates the same risk of pre-decomposition. Trials on a 2-drop hot runner with valve gates showed no visible residue for 500 cycles when the hot-runner manifold was set to 210 °C, but after 1000 cycles at 230 °C a brown film accumulated and gate sticking occurred. This operational boundary requires cycle times below 45 s and no unnecessary hold-up in the barrel. On conventional cold-runner injection moulding, barrel temperatures of 185/195/200/205/200 °C, mould temperature 40 °C, screw back pressure 8–12 bar, and injection speed 60–80 mm/s with a 2.0 mm nozzle diameter give uniform surfaces. Back pressures above 20 bar extend melt residence time and cause pre-decomposition, resulting in loss of UL 94 V-0 after 500 g of purge. The product is not intended for use in polyamide, polycarbonate, or polyester ester-based compounds where processing temperatures exceed 240 °C. Fillers with high water absorption, such as uncalcined kaolin above 20 wt%, can increase moisture uptake and should be followed by vacuum venting at −0.08 MPa or lower. For thin-wall moulding below 0.8 mm, published data for this specific configuration is limited, and verification under actual tool conditions is necessary.
