Ningxia Baofeng Energy HDPE HD-6081
- Product Name: Ningxia Baofeng Energy HDPE HD-6081
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Ningxia Baofeng Energy HDPE HD-6081 is typically used in formulations when melt flow index and processing temperature must be controlled within specific ranges.
| HS Code | 782577 |
| Density | 0.960 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 8.0 g/10 min |
| Tensile Strength At Yield | ≥25 MPa |
| Elongation At Break | ≥500% |
| Flexural Modulus | 1100 MPa |
| Izod Notched Impact Strength 23 C | 50 J/m |
| Vicat Softening Temperature | 125°C |
| Heat Deflection Temperature 0 45 Mpa | 80°C |
| Melting Point | 135°C |
| Crystallization Temperature | 115°C |
| Shore Hardness | 65 Shore D |
| Water Absorption 24 H | ≤0.01% |
| Volume Resistivity | ≥1×10^16 Ω·cm |
| Dielectric Strength | ≥20 kV/mm |
| Dielectric Constant | 2.3 |
As an accredited Ningxia Baofeng Energy HDPE HD-6081 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Ningxia Baofeng Energy HDPE HD-6081 packaging: 25 kg moisture-proof woven bags, palletized, stretch-wrapped, and labeled for industrial shipment. |
| Container Loading (20′ FCL) | 20′ FCL container loading: Ningxia Baofeng Energy HDPE HD-6081, 25 kg bags, palletized, shrink-wrapped, max 22 MT, suitable for sea export. |
| Shipping | Ningxia Baofeng Energy HDPE HD-6081 is shipped as non-hazardous polyethylene pellets. Standard packaging: 25 kg bags or 500–1000 kg jumbo bags, palletized and stretch-wrapped. Transport in clean, dry containers; keep cool, dry, ventilated, away from sunlight, heat, and moisture. No special hazard classification; avoid rupture and contamination. |
| Storage | Store Ningxia Baofeng Energy HDPE HD-6081 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, and ignition sources. Keep original packaging sealed to prevent moisture, dust, and contamination. Avoid strong oxidizers. Stack on pallets at safe heights to prevent deformation. Follow first-in-first-out and local SDS regulations. |
| Shelf Life | Stable for approximately 24 months when stored cool, dry, ventilated, away from direct sunlight and moisture. |
Injection moulding of thin-wall dairy and food containers from Ningxia Baofeng Energy HDPE HD-6081 is performed on stack moulds with 4 to 16 cavities per face. The process window depends on lot-specific melt flow rate confirmed under ISO 1133-1:2022 at 190°C and 2.16 kg; when this value is positioned between 7.5 g/10 min and 8.5 g/10 min, the filling pressure for a 0.6 mm nominal wall and 120:1 flow length-to-thickness ratio remains at 80 MPa to 110 MPa on hot-tip or edge-gated tools. Barrel zones are set to 175°C–195°C in the feed, 205°C–220°C in the compression zone, 210°C–225°C in the metering zone, and 210°C–220°C at the nozzle; melt temperature measured by hand probe should not exceed 235°C because oxidative degradation above 240°C can produce volatile aldehydes and ketones that reduce sensory panel scores, while overall migration compliance under EU Regulation No 10/2011 is verified using EN 13130-1. Injection velocity is held at 90 mm/s to 130 mm/s on a 28 mm screw, and velocity-to-pressure switchover is placed at 95% to 98% of the cushion stroke. A two-stage packing profile is used: first-stage hold at 55 MPa to 65 MPa for 1.2 s to 2.0 s compensates the 2.2% to 3.0% volumetric shrinkage of high-density polyethylene during crystallisation, and second-stage hold at 25 MPa to 35 MPa for 1.0 s to 1.8 s reduces overpacking at the gate and ejection pin punch-through. Mould coolant is maintained at 8°C to 16°C with turbulent flow above 10,000 Reynolds to achieve a cooling time of 3.5 s to 6.0 s; coolant below 6°C produces condensation marks on the rim and gate boss. Food-contact lots are checked against FDA 21 CFR 177.1520(c) 2.1, EU Regulation No 10/2011 overall migration below 10 mg/dm², and GB 4806.7-2016 where required. Slip and antiblock masterbatches are added at 1.0 wt% to 2.5 wt% only if the masterbatch carrier resin holds the same food-contact certification. Sink mark depth at the outer base corner is inspected by optical contour scanning and should remain below 30 μm; the base radius is therefore not reduced below 0.8 mm, and wall stock variation between the sidewall and base fillet is limited to 0.2 mm.
What causes cap skirt splitting in high-flow HDPE closure moulding?
Closure shells produced from HD-6081 on 32- to 64-cavity unscrewing moulds are filled at melt temperatures of 205°C to 225°C, with fast injection speed 150 mm/s to 250 mm/s to reproduce the knurl detail and inner plug seal geometry. Splitting at the skirt during application torque is controlled by the stress-crack resistance of the lot, which is measured under ASTM D1693-15b Condition B in 100% Igepal CO-630 at 50°C; closure applicants should not accept lots without a CofA value because high-flow HDPE can exhibit F50 values from 4 h to 25 h depending on comonomer content and molecular weight distribution. The capping torque for a 28 mm PCO 1881 neck is specified at 1.8 N·m to 2.3 N·m with a removal torque after 72 h at 23°C and 50% relative humidity not below 0.9 N·m. Erucamide slip additive migration at 500 ppm to 1200 ppm reduces coefficient of friction but also lowers removal torque by 15% to 30% after 14 days at 40°C because it blooms to the cap top and thread flank; if torque retention is demanded, a slip-free lot or a saturated amide at the lower end of that range is processed. Liner adhesion for induction seals is achieved with a foil/EPE liner compressed at capping head pressures of 0.8 MPa to 1.2 MPa and induction power settings corresponding to 180°C to 210°C sealant activation for 1.5 s to 2.0 s. The bottleneck is the gate vestige: a residual gate on the cap top exceeding 0.5 mm can pierce the liner and produce leakage; hot-tip gate diameters are therefore limited to 0.8 mm to 1.0 mm and the tip temperature is held at 200°C to 215°C. Processors running at cycle times below 3.2 s report increased gate stringing and cap pile-up on the unscrewing core; the minimum hold time is set at 0.8 s to 1.2 s and the ejection plate retraction is synchronised within 0.1 s of core rotation.
Heavy-gauge industrial crates and returnable pallets expose HD-6081 to a different failure mode than thin-wall packaging: creep and stack-load deformation are controlled by packing and gate freeze rather than flow length. A 3 mm to 5 mm nominal wall crate is injected on a machine with a screw diameter of 70 mm to 100 mm and a clamp force of 1500 t to 3500 t; fill time is set at 2.5 s to 4.5 s because slower flow causes cold layers to form near the mould wall and increases pressure drop across the 400 mm to 600 mm flow path. The melt temperature is maintained between 215°C and 240°C to reduce orientation-induced anisotropy, and mould temperature is maintained at 15°C to 25°C on the core and 12°C to 20°C on the cavity. If the cooling circuit is unbalanced to more than a 3°C delta across the base, then post-ejection warping appears as corner lift of 3 mm to 8 mm on a 1200 mm × 1000 mm pallet deck. Hold pressure is set at 35 MPa to 50 MPa for 8 s to 15 s until gate freeze, after which no further packing occurs; premature gate freeze causes sink marks at the rib intersections and reduces top load at yield by 5% to 10% because internal voids remain at the boss. Stacking load is evaluated under ISO 8611-1:2011 for pallets and under client-specific creep methods; dynamic compression on a crate sidewall is assessed at 45% to 65% relative humidity after 24 h of conditioning. UV-stabilised lots for outdoor returnable transit packaging contain 0.15 wt% to 0.30 wt% HALS and 0.10 wt% to 0.20 wt% o-hydroxybenzotriazole or benzophenone UV absorber; colour shift measured by CIELAB ΔE after 2000 h under ASTM D2565-16 Xenon-arc exposure is specified below 4.0. Carbon black in black or grey crates is incorporated at 2.0 wt% to 2.6 wt% as a 40% to 50% carbon black masterbatch; poor dispersion in let-down ratios above 4:1 produces agglomerates that become impact initiation sites under −20°C drop-impact testing.
Household article regulatory verification under EU Regulation 10/2011
HD-6081 for storage boxes, hangers and housewares is moulded in multi-cavity family tools with wall thicknesses from 1.2 mm to 3.5 mm. The material is processed at melt temperatures from 190°C to 225°C and mould temperatures from 10°C to 25°C; lower melt temperature reduces odour but also raises residual stress around gate inserts. Warpage in large flat lids produced from 2.0 mm wall is measured as 1.5 mm to 2.5 mm per 300 mm diagonal under ISO 294-4; to stay below that range, the tool is gated with a 0.8 mm to 1.2 mm edge gate on the long side and the parts are unloaded onto a cooling fixture for 5 s to 10 s. In toy applications, migration of elements is tested under EN 71-3:2019+A1:2021: barium below 375 mg/kg, cadmium below 1.9 mg/kg, chromium VI below 0.02 mg/kg, lead below 2.0 mg/kg, and total migration of organic substances under EU Regulation No 10/2011 below 10 mg/dm². Phthalate plasticisers are not used in HDPE; nonetheless, the polyolefin must comply with REACH Annex XVII Entry 51 when imported into the European Economic Area. Colour masterbatch is added at 1.0 wt% to 3.0 wt%, with titanium dioxide white added up to 4.0 wt% for hiding power; pearlescent pigments are limited to 0.1 wt% to 0.3 wt% in PP or PE carrier because excess platelet orientation at the flow front creates weld-line colour streaks visible on door sweeps and bin fronts. The injection speed on household articles is held at 30 mm/s to 80 mm/s, significantly lower than thin-wall packaging, to avoid high shear heating that causes local yellowing at hot-runner drops; hot-runner manifold temperatures are set to 210°C to 230°C and should not exceed 240°C for more than 5 min during start-ups.
| Segment | Regulatory framework | Test method | Specification |
|---|---|---|---|
| Thin-wall food contact | FDA 21 CFR 177.1520(c) 2.1; EU 10/2011; GB 4806.7-2016 | EN 13130-1; EN 1186-2 | < 10 mg/dm² |
| Closures | FDA 21 CFR 177.1520(c) 2.1; EU 10/2011 | ASTM D1693-15b Condition B | F50 from CofA |
| Toys and housewares | REACH Annex XVII Entry 51; EN 71-3:2019+A1:2021 | EN 71-3 | Pb < 2.0 mg/kg; Cd < 1.9 mg/kg |
| Outdoor crates | REACH Annex XVII | ASTM D2565-16; ISO 12048:1994 | ΔE < 4.0 at 2000 h |
When cold-chain containment replaces ambient distribution
Insulated box liners and freezer dividers injection moulded from HD-6081 are exposed to temperatures from −40°C to 25°C, so tensile elongation at break and impact resistance must be verified instead of flexural modulus alone. A 2.0 mm to 3.0 mm wall freezer-grade lot is specified by a notched Charpy impact at −40°C of at least 4.0 kJ/m² under ISO 179-1:2023, but published data for this specific configuration is limited and the producer’s CofA should be consulted; standard high-density injection grades can fall below 3.0 kJ/m² at −40°C if the crystallisation is driven to 72% to 77% by slow cooling in thick sections. The mould design uses a cold runner with a 6 mm to 8 mm diameter sprue and full-round runners of 5 mm to 7 mm because the lower flow path increases pressure retention during the 20 s to 35 s cooling phase. The injection pressure for a 1400 mm × 800 mm divider with a flow length-to-thickness ratio of 250:1 is set between 110 MPa and 135 MPa; a high-flow lot confirmed at 8 g/10 min under ISO 1133-1:2022 is able to fill at 110 MPa, while lower-flow lots may require 130 MPa or more and may develop frozen-in stress at the runner junction. Parts are annealed at 80°C to 100°C for 10 min to 30 min after ejection when strong dimensional stability in service is required; annealing reduces locked-in stress by 30% to 40% as measured by post-anneal dimensional recovery under ISO 294-4 and by a lower incidence of stress cracking under ASTM D1693-15b. The internal liner surface is often wiped with ethanol or quaternary ammonium disinfectants; stress-crack resistance under ASTM D1693-15b Condition A should be verified when repeated disinfection is specified because detergents and oxidisers accelerate the slow crack growth of high-density polyethylene at gate-looking weld lines.
Boss failures in high-flow HDPE agricultural bins
Agricultural bins, nursery flats and compost containers moulded from HD-6081 use wall thicknesses from 2.0 mm to 4.0 mm and are usually run in tools with less polish than packaging moulds, at mould temperatures from 15°C to 30°C. The primary failure mode is not wall cracking at the base but boss shear at the handle and hinge points, where knit lines are formed around the core pin. The gate location is moved so that the boss is filled first and the melt front meets at a point 3 to 5 times the wall thickness away from the boss; otherwise the weld line remains at the boss root and reduces flexural modulus retention by 15% to 25% under ISO 178:2019. Fill speed on agricultural parts is set at 40 mm/s to 70 mm/s, lower than for thin-wall applications but high enough to avoid surface flow marks on textured cavity surfaces. Vent grooves are cut at 0.015 mm to 0.030 mm depth and 6 mm to 8 mm width at the end of fill near the sidewall; inadequate venting causes diesel effect, visible as brown streaks and measurable as local viscosity reduction due to gas compression heating above 260°C. UV resistance for outdoor nursery containers is formulated with 2.0 wt% to 2.5 wt% carbon black masterbatch or with 0.20 wt% to 0.40 wt% HALS and 0.15 wt% to 0.25 wt% UVA; tensile strength retention after 2000 h under ASTM D2565-16 is specified above 75% of initial value. In drip irrigation trays, the part is exposed to 80°C to 95°C water and fertiliser solutions for short durations; the polymer must be evaluated for environmental stress-cracking resistance under ASTM D1693-15b with 10% Igepal at 50°C because the combination of heat and surfactant can quickly propagate cracks from gate vestiges if the CofA value falls below the closure-grade requirement.
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- Ningxia Baofeng Energy HDPE HD-6081 is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: admin@ascent-chem.com.
Ningxia Baofeng Energy HDPE HD-6081 is a high-density polyethylene grade positioned within the producer’s integrated coal-to-olefins product slate. The designation HD-6081 identifies a material that is frequently referenced in supplier and converter communications as an injection-molding grade for rigid packaging, closures, and thin-wall containers; however, independent public verification of a producer-issued technical data sheet for this exact designation remains limited. Lot-specific certificates of analysis issued by Ningxia Baofeng Energy therefore constitute the controlling specification for any downstream qualification. The absence of a widely published datasheet does not prevent objective evaluation, but it requires incoming inspection to be based on measured values obtained under the standard methods described below rather than on assumptions derived from similar-sounding HDPE grades.
What Standard Methods Should Anchor the Specification Review for HD-6081?
For any high-density polyethylene, the specification review should first distinguish melt mass-flow rate from melt volume-flow rate. Melt mass-flow rate is determined at 190 °C with a 2.16 kg load according to ISO 1133-1:2022 or ASTM D1238-23. High-load melt mass-flow rate at 21.6 kg provides the melt index ratio, which is an indirect indicator of molecular weight distribution. Density is measured by ISO 1183-1:2019 or ASTM D1505 after conditioning at 23 °C. The density result controls crystallinity, flexural stiffness, and shrinkage. Tensile yield stress and elongation at yield are evaluated under ISO 527-2:2012 or ASTM D638-14. Flexural modulus is measured under ISO 178:2019 or ASTM D790-17. Charpy notched impact strength is determined by ISO 179-1:2010 or ASTM D6110-18. Vicat softening point uses ISO 306:2022 or ASTM D1525-17e1, and Shore D hardness uses ISO 868:2003 or ASTM D2240-15.
| Property | Standard method | Role in HD-6081 qualification |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 / ASTM D1238-23 | Defines filling pressure, shot-to-shot consistency, and minimum wall section |
| Density | ISO 1183-1:2019 / ASTM D1505 | Controls crystallinity, flexural modulus, and molded part shrinkage |
| Tensile yield stress | ISO 527-2:2012 / ASTM D638-14 | Indicates short-term load-bearing capacity before yielding |
| Flexural modulus | ISO 178:2019 / ASTM D790-17 | Related to stiffness in rigid closures and containers |
| Charpy notched impact | ISO 179-1:2010 / ASTM D6110-18 | Assesses low-temperature crack arrest and drop resistance |
| Vicat softening point | ISO 306:2022 / ASTM D1525-17e1 | Indicates resistance to short-term thermal exposure |
| Shore D hardness | ISO 868:2003 / ASTM D2240-15 | Evaluates surface indentation and scratch behavior |
Single-point tests do not capture molecular weight distribution. A parallel-plate dynamic frequency sweep is therefore more informative for detecting batch-to-batch variance. The Cox-Merz approximation can be used to correlate complex viscosity from oscillatory shear with steady-shear capillary viscosity, but the relationship can break down at high frequency for highly shear-thinning or wall-slipping melts. For HD-6081, the absence of published rheological curves means that each lot should be characterized at 190 °C over 0.1 rad/s to 100 rad/s before establishing mold-filling simulations or production settings.
The Chinese HDPE designation pattern sometimes uses a suffix such as 81 to indicate a nominal melt mass-flow rate near 8 g/10 min at 190 °C and 2.16 kg. This convention is not uniformly applied across all producers, and Ningxia Baofeng Energy has not publicly confirmed that the suffix applies to HD-6081. The melt flow rate of an injection-molding HDPE grade commonly falls within a broad range from 4 g/10 min to 12 g/10 min, but this interval is a general industrial reference and not a specification for HD-6081.
When HD-6081 is compared with high-strength bimodal pipe grades, processing behavior diverges sharply
High-density polyethylene is not a single processing material. A resin designed for thin-wall injection molding exhibits lower melt strength and higher melt flow rate than a bimodal pipe extrusion grade. Bimodal pipe grades typically show low melt mass-flow rate and elevated high-load melt mass-flow rate, which provides a combination of high shear thinning during extrusion and high melt strength during sag-sensitive forming. If HD-6081 is an injection-molding grade, its molecular architecture would be expected to favor rapid filling, short holding times, and stable ejection rather than long-duration parison stability or slow pipe cooling. The difference is not simply a change in melt temperature; it reflects a different distribution of chain lengths and comonomer placement.
Comparison with film grades is equally dependent on molecular architecture. High-strength blown film HDPE grades are often formulated with a bimodal molecular weight distribution to balance bubble stability and dart impact. By contrast, an injection-molding grade such as HD-6081 would be expected to display a narrower distribution, lower melt elasticity, and reduced die swell. Those features are beneficial for dimensional control in multicavity molds but undesirable in blown film lines where bubble oscillation and neck-height instability can develop when the resin lacks sufficient strain hardening.
On production-scale injection equipment, the practical processing window for an HDPE with an inferred melt mass-flow rate near 8 g/10 min often falls between 200 °C and 260 °C melt temperature. Mold temperatures of 20 °C to 40 °C are typical for rigid packaging. If the mold surface temperature drops below 15 °C, thin sections freeze before complete packing, resulting in sink marks and reduced weld-line strength. If the melt temperature exceeds 270 °C, oxidative degradation can reduce impact strength and generate odor. These boundaries are general HDPE processing observations and must be adjusted with actual capillary rheometry and differential scanning calorimetry data for the specific lot.
Rheological characterization and melt-fracture boundaries in rapid injection molding
Dynamic oscillatory measurement at 190 °C provides the storage modulus, loss modulus, and complex viscosity. For an injection-molding HDPE, the zero-shear viscosity is usually lower than that of a pipe or blow-molding grade. The degree of shear thinning is indicated by the slope of complex viscosity versus angular frequency. A narrow-distribution resin typically shows less shear thinning than a bimodal resin, which means that apparent viscosity remains relatively stable over the shear rate range encountered during filling. This can be advantageous for consistent cavity-pressure transfer but may also reduce melt strength in large gates or thick sections.
Melt fracture becomes a limitation when the shear rate in the runner or gate exceeds the critical shear rate of the material. Sharkskin and gross melt fracture can produce surface defects in thin-wall containers and closures. The critical shear rate is not a universal HDPE constant; it depends on molecular weight, molecular weight distribution, melt temperature, and die surface roughness. A hot-runner system with polished nickel or chrome-plated surfaces reduces the probability of wall slip and surface defects, but it does not eliminate the material limit. When a new lot of HD-6081 is introduced, capillary rheometry at 190 °C, 210 °C, and 230 °C can establish whether the critical shear rate shifts enough to require processing changes.
Gate freeze-off is another boundary. If the gate diameter is below 0.8 mm, high-density polyethylene can solidify in the gate before adequate packing is achieved. This is especially critical in closure applications where dimensional stability is required across a large number of cavities. Sequential valve-gate control can improve filling balance in family tools, but it adds hot-runner complexity. Molders processing HD-6081 should record gate seal time, peak cavity pressure, and screw recovery time as part of lot acceptance because these process variables detect viscosity drift more rapidly than laboratory melt flow testing alone.
Comparative positioning, food-contact pathways, and supply-chain inspection constraints
HDPE grades are often differentiated by density and melt flow rate, but these two values alone cannot predict environmental stress crack resistance. Environmental stress crack resistance is evaluated using methods such as ASTM D1693 or the notched constant tensile load test, and it is strongly influenced by molecular weight, short-chain branching, and catalyst residues. If HD-6081 is used for rigid detergent or chemical packaging, environmental stress crack resistance must be included in the application-specific qualification. A lower melt flow rate grade generally offers better stress crack resistance, while a high-flow injection grade may require careful mold design to avoid sharp transitions and knit lines that concentrate stress.
For food-contact applications, compliance is not automatically conferred by resin density. Olefin polymers intended for food contact may be evaluated under FDA 21 CFR 177.1520 in the United States or under EU Regulation No. 10/2011 in the European Union. The EU regulation requires overall migration testing with food simulants, and the results must remain below the specified limits. Hexane extraction and specific migration tests may be required for fatty foods. Ningxia Baofeng Energy should be requested to provide a food-contact declaration and supporting migration data for HD-6081 before commercial use. A general HDPE classification is not a substitute for lot-specific regulatory documentation.
Coal-to-olefins production routes can generate trace oxygenates, low molecular weight hydrocarbons, and catalyst residues that influence organoleptic performance. If HD-6081 is used in closures or containers for taste-sensitive products, the converter should specify sensory evaluation, total volatile content, and oxidation induction time. Oxidation induction time is determined by differential scanning calorimetry under ISO 11357-6:2018 or ASTM D3895-19. A shorter oxidation induction time may indicate insufficient stabilizer addition or exposure during processing. Incoming lots should be tested for melt flow rate shift before and after multiple extrusion or molding cycles to estimate thermal stability under realistic recycling conditions.
When comparing HD-6081 with a conventional HDPE blow-molding grade, the most immediate practical difference is melt strength. Blow-molding grades resist sag because their molecular weight distribution and chain architecture provide higher extensional viscosity at low strain rates. Injection-molding grades are not designed for this condition. Substituting an injection grade into blow molding can produce parison thinning, wall thickness variation, and poor pinch-off integrity. Conversely, using a blow-molding grade in rapid injection molding can create gate freeze-off, incomplete packing, and excessive clamp force demand. The substitution difference is therefore a function of rheology rather than density alone.
For lot acceptance of HD-6081, a minimal incoming inspection should include melt mass-flow rate, density, ash content, and a torque or dynamic viscosity signature. Ash content can be measured according to ISO 3451-1:2019. Elevated ash may indicate polymerization catalyst residues or contamination. A narrow acceptance band for melt mass-flow rate, established from at least 10 consecutive production lots, permits detection of drift before molding defects appear. If no historical data are available, the first production trials should operate at reduced cavitation and with conservative hold-pressure settings until the material’s response under real shear conditions is verified.
Published data for this specific configuration is limited, so any process capability study must be referenced to the actual lot certificate and not to generic HDPE category values. The technical approach for HD-6081 therefore remains the same as for any poorly documented resin: measure first, establish internal control limits, and maintain traceability from the producer’s certificate through processing and finished-part testing.
