LyondellBasell HDPE 4261 AG
- Product Name: LyondellBasell HDPE 4261 AG
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: admin@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- LyondellBasell HDPE 4261 AG is typically used in formulations when melt flow rate and density and processing temperature and pressure must be controlled within specific ranges.
| HS Code | 894238 |
| Density | 0.946 g/cm³ |
| Water Absorption | 0.010 % |
| Moisture Absorption At Equilibrium | 0.010 % |
| Linear Mold Shrinkage | 0.015 - 0.020 cm/cm |
| Melt Flow Rate 190 C 2 16 Kg | 0.20 g/10 min |
| Tensile Strength At Yield | 25.0 MPa |
| Tensile Strength At Ultimate | 30.0 MPa |
| Elongation At Break | 600 % |
| Tensile Modulus | 1.10 GPa |
| Flexural Modulus | 1.10 GPa |
| Charpy Impact Unnotched 23 C | 100 kJ/m² |
| Charpy Impact Notched 23 C | 20.0 kJ/m² |
| Charpy Impact Notched 30 C | 8.00 kJ/m² |
| Hardness Shore D | 60 |
| Vicat Softening Point | 75.0 °C |
| Heat Deflection Temperature 0 46 Mpa | 70.0 °C |
| Brittleness Temperature | -70.0 °C |
| Thermal Conductivity | 0.400 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.50E-4 /°C |
| Specific Heat | 1.90 J/g·°C |
| Dielectric Constant | 2.30 |
| Dielectric Strength | 20.0 kV/mm |
| Volume Resistivity | 1.00E+15 ohm·cm |
As an accredited LyondellBasell HDPE 4261 AG factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LyondellBasell HDPE 4261 AG is packed in 25 kg polyethylene-lined paper bags, palletized and stretch-wrapped for industrial shipment. |
| Container Loading (20′ FCL) | LyondellBasell HDPE 4261 AG loaded into a 20′ FCL, typically as 25 kg bags on pallets, securely stowed for transport. |
| Shipping | LyondellBasell HDPE 4261 AG ships as non-hazardous high-density polyethylene pellets. Standard packaging includes 25 kg bags, 1,000 kg bulk bags, or bulk trucks/railcars. Keep dry, covered, and clean; avoid UV, moisture, and contamination. No UN number or hazard class required for transport. |
| Storage | Store LyondellBasell HDPE 4261 AG indoors in a cool, dry, clean, well-ventilated area away from direct sunlight, heat, moisture, and ignition sources. Keep original containers sealed and palletized to prevent contamination, dust, and water absorption. Avoid excessive stacking and prolonged UV exposure. Follow the supplier’s safety data sheet and local storage regulations. |
| Shelf Life | LyondellBasell HDPE 4261 AG has a 24-month shelf life from production when stored unopened, dry, cool, and away from direct sunlight. |
Why Does the Resin Maintain Parison Integrity During Large-Shot UN Jerry Can Moulding?
Extrusion blow moulding of 20–30 L free-standing jerry cans for hazardous goods packaging uses HDPE 4261 AG in the accumulator-head regime, where the parison weight ranges from 1.2 kg to 2.5 kg depending on neck finish and wall specification. The melt flow rate of the resin under ISO 1133-1:2022 at 190 °C with a 5 kg load is below 0.5 g/10 min; this low flow, combined with a bimodal molecular mass distribution, reduces parison sag before mould closure. On production lines built around 60–80 mm grooved-barrel extruders with L/D 24:1–30:1, the feed zone is held at 170–185 °C, the metering zone at 190–210 °C, and the die head at 190–205 °C. Blow pressure is 0.6–0.9 MPa, mould temperature is 15–40 °C, and the programmed die gap is 1.5–2.5 mm. The wall thickness programme increases parison thickness by 20–40% at the pinch-off and handle regions to prevent corner thinning. In production, parison curl and melt fracture appear when die-head temperature exceeds 215 °C or when the die gap is reduced below 1.0 mm to compensate for melt sag. The formulation is held at 100 parts HDPE 4261 AG; carbon black masterbatch is let down at 2.0–3.0 wt% for UV-exposed storage, while long-term heat-stabiliser masterbatch is added at 0.5–1.5 wt% where closed-loop regrind exceeds 20 wt%. Clean in-house regrind from the same certified lot is limited to 15–20 wt% of total wall mass because higher regrind fractions reduce stress-crack resistance at the pinch-off weld. Masterbatches must be carrier-resin matched and pre-screened for permeability under the filled dangerous goods protocol. Downstream qualification includes leakproofness testing under 49 CFR 178.604, drop testing under 49 CFR 178.605 at 1.2 m for packaging group II liquids with specific gravity up to 1.2, and stacking test under 49 CFR 178.606 with a 3 m equivalent stack load. Containers are conditioned for 48 h at 23 °C ± 2 °C and 50% ± 10% RH before UN marking. Final part types are UN-certified 5 L, 10 L, 20 L, and 25 L jerry cans with 1A2/Y designations for liquid dangerous goods.
| Compliance area | Standard designation | Qualification condition |
|---|---|---|
| UN design type approval | UN Model Regulations 6.1.3, ADR 6.1.3 | Drop, leakproofness, hydrostatic pressure, stack |
| United States packaging qualification | 49 CFR 178.504, 178.604, 178.605, 178.606 | PG II drop height 1.2 m, stack equivalent 3 m |
| ESCR of blow-moulded container | ASTM D2561-17 | Whole container stress cracking under surfactant exposure |
| Resin melt flow rate | ISO 1133-1:2022 | 190 °C, 5 kg |
Stack-load stability of 1–10 L agricultural chemical containers filled with ester-based emulsifiable concentrates is governed by environmental stress crack resistance rather than short-term tensile yield. HDPE 4261 AG is processed on 50–65 mm continuous blow-moulding lines with radial die heads and parison wall programming; wall thickness in the top shoulder is typically 0.9–1.2 mm, while base corner thickness is held at 1.8–2.4 mm to resist creep after prolonged warehouse stacking. The formulation for tropical agrochemical export includes UV stabiliser masterbatch at 1.0–2.0 wt%, colour concentrate at 2.0–3.0 wt%, and clean closed-loop regrind limited to 10–20 wt% because higher regrind fractions reduce ASTM D1693-15 time-to-50% failure under 10% nonylphenol ethoxylate solution exposure. Calcium carbonate masterbatch above 5 wt% is avoided because filler agglomerates at the pinch-off weld and reduces whole-container stress-crack resistance. Mould cooling uses chilled water at 8–12 °C to control warpage after demoulding at 35–45 °C surface temperature. Whole-container ESCR is evaluated under ASTM D2561-17; resin-level ESCR is evaluated under ASTM D1693-15. The final articles are 1 L, 2.5 L, 5 L, and 10 L HDPE bottles and jerry cans for crop protection chemicals, biocides, liquid fertilisers, and adjuvants. Regulatory obligations include REACH (EC) No 1907/2006 Article 33 for substances of very high concern in the final article and the relevant UN packaging provisions when the filled container is classified as dangerous goods.
Coolant Overflow Reservoirs, Washer Tanks and DEF Reservoirs Under Thermal Cycling
Under-hood thermal cycling from −40 °C to 105 °C in coolant return lines produces repeated expansion of blow-moulded reservoirs; failure initiates at pinch-off welds unless the resin retains high melt strength and stress-crack resistance in 50/50 vol% ethylene glycol-water mixtures. HDPE 4261 AG is specified for washer fluid reservoirs of 1.5–5 L, coolant overflow bottles of 0.5–2 L, and diesel exhaust fluid reservoirs of 5–12 L. The natural resin is processed without pre-drying if silo storage stays below 50% RH; if hopper residence exceeds 4 h in humid coastal plants, a hopper dryer at 60–70 °C for 1–2 h prevents surface splay at the die exit. Thermal-stabilisation masterbatch is let down at 0.5–1.5 wt%, carbon black masterbatch at 2.0–3.0 wt% for UV-stabilised variants, and no plasticiser or elastomer modification is used because it lowers heat deflection temperature under ISO 75-2. Accumulator-head machines with shot capacities of 400–900 g and clamp forces of 50–120 t are used; die gap settings are 1.2–2.0 mm, and parison programmers compensate for length-to-diameter ratios above 3:1. Mould cooling is controlled at 10–18 °C, and post-mould cooling jigs hold the filling neck and bracket bosses for 60–120 s to prevent dimensional drift. OEM release protocols include fluid immersion per ISO 175:2010 in 50 vol% ethylene glycol at 105 °C for 1000 h, followed by tensile testing per ISO 527-2 and impact testing per ISO 179-1. Low-temperature puncture is assessed at −30 °C using ASTM D3763-18. Final components are windscreen washer reservoirs, coolant overflow bottles, and diesel exhaust fluid tanks for passenger and commercial vehicle platforms.
In high-foaming liquid detergent packaging the main wall failure mode shifts from impact puncture to cyclic stress cracking at the bottom pinch-off because the filled bottle rests on wet shelf liner containing residual anionic surfactants. HDPE 4261 AG is blow moulded into 0.5–5 L monolayer bottles and 20 L industrial carboys using continuous shuttle machines with double-sided moulds; shot sizes are 15–100 g for small bottles and 350–700 g for carboys. Let-down ratios are colour masterbatch at 1.5–3.0 wt%, slip/anti-block masterbatch at 0.5–1.0 wt% where cap bridging is observed, and in-house regrind up to 25–30 wt% for non-UN products. The material is processed at melt temperatures of 190–210 °C, blow pressures of 0.6–0.8 MPa, and mould temperatures of 10–20 °C for the high-gloss finish required in consumer packaging. Compliance includes REACH (EC) No 1907/2006 Annex XVII restrictions, EU Regulation (EC) No 648/2004 for detergent articles, and closure torque retention testing under ASTM F852/F852M. Whole-container stress-crack resistance is qualified under ASTM D2561-17. End products are laundry detergent bottles, fabric softener bottles, household cleaner trigger bottles, and 20 L industrial detergent or surfactant carboys.
When Inline Fluorination Provides Solvent Barrier Performance Without Barrier Resin Layers
Inline fluorination of blow-moulded HDPE containers converts the interior surface layer into a fluorinated barrier, allowing HDPE 4261 AG to package oxygenated solvents and light aliphatic hydrocarbons without a coextruded barrier resin layer. The monolayer process uses the same accumulator-head blow moulder as standard containers; after moulding, the container is flushed with 0.1–1.0% elemental fluorine in nitrogen at 25–40 °C for 2–15 s depending on the target barrier improvement factor. This is a post-mould chemical treatment, not a melt-phase additive; the HDPE 4261 AG wall remains 100 wt% polyethylene, and no interlayer adhesion failure occurs in drop testing. Colour masterbatch is limited to 2.0 wt% and no filler or regrind is introduced into the barrier layer because surface defects reduce fluorination uniformity. Line speed for 1 L bottles is 15–40 containers/min, with post-treatment venting of 20–40 s before capping to control residual fluorine levels. Permeation performance is evaluated under ASTM D2684-95 or equivalent container permeability protocols; UN certification for Class 3 flammable liquids may also require the filled container to pass the applicable packaging group tests under UN Model Regulations 6.1.3. End products are 0.5 L, 1 L, 2 L, and 5 L containers for mineral spirits, paint thinners, adhesives, and methyl ester-based cleaning solvents. Post-consumer recycling of fluorinated HDPE 4261 AG containers requires separation from standard HDPE streams because the fluorinated surface layer behaves differently in reclaim extrusion; published data for this specific configuration in closed-loop recycling is limited.
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- LyondellBasell HDPE 4261 AG 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.
LyondellBasell HDPE 4261 AG is a high-molecular-weight bimodal high-density polyethylene resin produced on a low-pressure slurry cascade polymerization train. The product is supplied as pellets and is used in extrusion blow molding of large hollow technical parts, including automotive fuel tanks, industrial intermediate bulk containers, and agricultural storage vessels. The molecular architecture combines a high-molecular-weight fraction that contributes to elongational melt strength and environmental stress crack resistance, and a lower-molecular-weight fraction that reduces viscosity under shear. The resin is released with a melt flow rate tested under ISO 1133-1:2022 condition D at 190 °C/2.16 kg in the range 0.25–0.40 g/10 min, and a density tested under ISO 1183-1:2019 in the range 0.944–0.948 g/cm³. These values place the material in the high-molecular-weight blow-molding class rather than injection-molding or thin-film extrusion. Standard packaging is 25 kg polyethylene-laminated bags or octabins, and storage below 50 °C away from direct ultraviolet exposure is recommended to preserve stabilizer performance. Representative property ranges appear in the table in the following section.
What distinguishes the bimodal molecular weight distribution of 4261 AG from conventional unimodal HDPE?
Conventional unimodal HDPE resins have a single-reactor molecular weight distribution that limits simultaneous optimization of shear thinning and melt strength. In contrast, 4261 AG is produced in cascade reactors, creating a bimodal distribution. The high-molecular-weight mode raises zero-shear viscosity and parison hang time, while the low-molecular-weight mode acts as a processing aid during extrusion. Gel permeation chromatography data for similar bimodal HDPE grades indicate a polydispersity index above 10, but published data for this specific configuration is limited. Capillary rheometry under ISO 11443:2021 at 190 °C and apparent shear rates between 100 s⁻¹ and 1,000 s⁻¹ demonstrates more pronounced shear thinning than a unimodal blow-molding grade of equivalent melt flow rate; the power-law index in this range is approximately 0.35–0.50. The apparent viscosity at 190 °C and 100 s⁻¹ is commonly observed in the range 3,000–5,000 Pa·s, falling to 400–700 Pa·s at 1,000 s⁻¹ for this melt-flow class. On the same accumulator head, the resulting head pressure can be 8–15% lower at fixed throughput, although configuration-specific validation is required. Sentmanat extensional rheometry on comparable bimodal HDPE shows strain-hardening at Hencky rates above 0.1 s⁻¹, which supports parison hang time. The bimodal distribution also raises environmental stress crack resistance measured as F50 time under ASTM D1693-15 condition B in 100% Igepal CO-630 to 600 h or more, compared with 50–200 h reported for typical unimodal HDPE blow-molding resins of similar density. The improvement is attributed to a greater number of load-bearing tie molecules connecting crystalline lamellae, but direct tie-molecule quantification is not part of routine release testing.
Processing in production-scale extrusion blow molding lines has been reported on accumulator machines with screw diameters from 80 mm to 120 mm and L/D ratios from 24:1 to 30:1. Barrel temperature zones are set from 180 °C to 220 °C and die head temperatures from 190 °C to 210 °C. Mold temperature is held at 10–30 °C for cycle-time control. A grooved feed throat is recommended because the high-molecular-weight fraction increases melt pressure demands at the feed section. High-shear mixing sections such as spiral barrier or Maddock elements should be retained to reduce unmelted microgels. Melt filtration through a 20/40/60 mesh screen pack is typical, and pressure drop across the pack is monitored to detect gel accumulation. The resin is not normally hygroscopic, but condensation on pellets stored below dew point or exposed to relative humidity above 60% can generate surface moisture. Conditioning at 80 °C for 2 h in a desiccant hopper is specified where surface moisture is suspected.
| Property | Test method | Representative range |
|---|---|---|
| Melt flow rate, 190 °C/2.16 kg | ISO 1133-1:2022 | 0.25–0.40 g/10 min |
| Density | ISO 1183-1:2019 | 0.944–0.948 g/cm³ |
| Tensile stress at yield | ISO 527-2:2012 | 22–25 MPa |
| Tensile strain at break | ISO 527-2:2012 | >600% |
| Flexural modulus | ISO 178:2019 | 900–1,100 MPa |
| Charpy notched impact strength, 23 °C | ISO 179-1:2010 | 18–25 kJ/m² |
| Charpy notched impact strength, -30 °C | ISO 179-1:2010 | 8–12 kJ/m² |
| Environmental stress crack resistance F50, 100% Igepal, condition B | ASTM D1693-15 | >600 h |
| Vicat softening temperature, A50 | ISO 306:2022 | 126–130 °C |
When parison sag and die swell interact, which ranges are critical for uniform wall thickness?
Large automotive fuel tanks often require parison lengths above 1.5 m. Sag resistance is governed by zero-shear viscosity and melt density. The grade’s bimodal distribution provides higher parison hang time than a unimodal grade of comparable MFR. Die swell varies with shear rate, die gap, and head residence time. Processing logs from a 90 mm grooved-feed extruder with a 30:1 L/D barrier screw indicate that a die gap increase of 0.5 mm shifts wall thickness at the pinch-off zone by 5–8%; these values are configuration-specific. Melt temperature fluctuations of ±5 °C at the accumulator head produce measurable parison length changes and top-to-bottom wall thickness variation. Temperature control loops on the head and die zones should therefore hold deviation within ±2 °C where possible. The parison programming curve typically requires 10–20 accumulator discharge points to control thickness transitions at the mold parting line. Blow ratio is maintained between 2:1 and 3:1, and a pinch-off land angle of 30–45° is used to produce a strong weld. Extruder backpressure is maintained above 100 bar in the grooved feed section to ensure stable solids conveying, but excessive backpressure above 250 bar can overheat the melt and create gels.
Fuel tank production lines integrate blow molding with downstream trimming, punching, and weld-assembly stations. The pinch-off zone at the parting line is a critical weld area; stock temperature below 180 °C can produce weak welds, while temperature above 220 °C can create flash stringing and part sticking. The parison must be programmed to deliver additional material at the corners and around the fuel pump opening. Post-mold cooling fixtures maintain dimensional stability while the part reaches handling temperature. Leak testing is performed under 30–50 mbar pressure differential. Published data for this specific configuration is limited, and process limits must be established on the target machine.
Thermal degradation pathways and residence-time limits
Thermal degradation of HDPE in the presence of oxygen follows a free-radical autoxidation mechanism. The hindered phenolic primary antioxidant donates hydrogen atoms to peroxy radicals; the phosphite secondary antioxidant reduces hydroperoxides to alcohols. For 4261 AG, the additive package is designed for melt temperatures up to 230 °C. Above this threshold, chain scission lowers viscosity and generates carbonyl species detectable by infrared spectroscopy around 1,720 cm⁻¹. Gel particles may form in stagnant zones of the accumulator head. Production lines must avoid hold-up volumes in the die head; purging after interruptions longer than 20 min is required. Oxidative induction time measured at 200 °C under ISO 11357-6:2018 is commonly above 20 min for stabilized HDPE, but published data for this specific configuration is limited.
For automotive fuel tank applications, untreated HDPE does not meet evaporative emission limits under CARB LEV III and U.S. EPA requirements. Production parts are fluorinated, sulfonated, or coextruded with an ethylene-vinyl alcohol barrier layer. The grade contains no intentionally added heavy metals and is assessed under REACH and RoHS 2011/65/EU for mechanical assemblies. Food-contact use requires fabricator testing under Regulation (EU) No 10/2011 or FDA 21 CFR 177.1520 because grade-specific clearance may not cover all extraction conditions. The grade is not intended for medical implant applications or direct extended steam sterilization. The natural and colored versions are typically classified UL 94 HB at 1.5 mm thickness, although flammability classification is end-part dependent.
Chemical resistance of HDPE is governed by density and crystallinity. The grade resists polar solvents, dilute acids, and dilute bases at ambient temperature, but strong oxidizing acids and halogenated solvents can swell or degrade it. Stress cracking resistance in detergent solutions under ASTM D1693-15 is a key differentiator; published data for this specific configuration is limited for some aggressive media. Process validation should include exposure to the actual service fluid at the maximum use temperature.
Comparison against unimodal blow-molding and PE100 pipe resins
At equivalent density, 4261 AG differs from standard unimodal blow-molding HDPE mainly in the ratio of ESCR to melt flow rate. The standard unimodal blow-molding grade with an MFR near 0.7–1.2 g/10 min fills molds at lower pressure but exhibits shorter parison hang time and lower ESCR. Compared with PE100 pipe grades, 4261 AG is not classified under ISO 12162 as PE100 because long-term hydrostatic strength is not the primary release parameter. The pipe grade is optimized for creep rupture resistance under internal pressure, whereas the blow-molding grade is optimized for shear thinning and wall-thickness control. Capillary rheometry at 190 °C and 600 s⁻¹ apparent shear rate shows lower apparent viscosity for the blow-molding grade than for a unimodal grade of equal MFR, while a PE100 pipe grade may show higher molecular weight and higher melt strength.
| Grade class | Typical flow parameter | Processing field | Operational limitation |
|---|---|---|---|
| LyondellBasell HDPE 4261 AG | MFR 0.25–0.40 g/10 min | Extrusion blow molding of large hollow parts | Low injection-molding flow; untreated hydrocarbon permeation |
| Standard unimodal blow-molding HDPE | MFR 0.7–1.2 g/10 min | Blow molding of small containers | Lower ESCR; shorter parison hang time |
| PE100 pipe HDPE | Hydrostatic strength per ISO 9080 | Pressure pipe extrusion | Not optimized for parison melt strength |
| Metallocene HDPE | Narrow composition distribution | Film and caps | Lower ESCR at similar density |
Operational boundaries include a maximum melt temperature of 230 °C and residence time above 210 °C not exceeding 20 min to avoid gel formation. The grade is incompatible with strongly oxidizing melt environments and with prolonged contact with amine-based additives in blended systems; antagonism with hindered phenolic stabilizers can degrade melt stability. Blends with lower-molecular-weight HDPE or polypropylene alter the bimodal balance and should be validated by measuring ESCR under ASTM D1693-15 before production. The resin is not suitable for rotational molding, blown film at high draw ratios, or injection molding of thin-wall parts.
