LyondellBasell HDPE LP552-01 NARROW
- Product Name: LyondellBasell HDPE LP552-01 NARROW
- 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 LP552-01 NARROW is typically used in formulations when melt flow rate/density and melt temperature/shear rate must be controlled within specific ranges.
| HS Code | 779730 |
| Density | 0.955 g/cm³ |
| Melt Index 190 C 2 16 Kg | 0.35 g/10 min |
| Tensile Strength At Yield | 26 MPa |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1240 MPa |
| Environmental Stress Crack Resistance Escr | >1000 h |
| Vicat Softening Temperature | 127°C |
| Melting Temperature | 130°C |
| Crystallization Temperature | 115°C |
| Hardness Shore D | 66 |
| Brittleness Temperature | < -73°C |
| Thermal Conductivity | 0.45 W/m·K |
| Specific Heat Capacity | 1.9 kJ/kg·K |
| Water Absorption | <0.01% |
| Dielectric Constant | 2.3 |
| Volume Resistivity | >10^16 Ω·cm |
| Coefficient Of Linear Thermal Expansion | 1.4 × 10⁻⁴ /°C |
As an accredited LyondellBasell HDPE LP552-01 NARROW factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | LyondellBasell HDPE LP552-01 NARROW is packaged in 25 kg polyethylene bags, 55 bags per pallet (1,375 kg). |
| Container Loading (20′ FCL) | A 20′ FCL container is loaded with LyondellBasell HDPE LP552-01 NARROW resin, palletized, dry, clean, and ready for ocean shipment. |
| Shipping | LyondellBasell HDPE LP552-01 NARROW ships as non-hazardous polyethylene resin pellets. It is not DOT/IMDG/IATA regulated. Use clean, dry 25 kg bags, bulk bags, octabins, or bulk hopper cars. Protect from moisture, contamination, and direct sunlight. Store sealed at ambient temperature; avoid prolonged heat and UV exposure. |
| Storage | Store LyondellBasell HDPE LP552-01 NARROW in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original containers or bags closed, palletized, and off the floor to prevent moisture, dust, and contamination. Protect from physical damage and follow SDS, local regulations, and first-in, first-out stock rotation. Use appropriate PPE when handling. Do not store near incompatible materials. |
| Shelf Life | Typically 24 months from manufacture when stored dry, in unopened original packaging, away from direct sunlight and heat. |
Thin-wall dairy and frozen-food container production using LyondellBasell HDPE LP552-01 NARROW is centred on hot-runner multi-cavity injection moulding where wall thicknesses between 0.5 mm and 0.9 mm compress the processing window to a narrow solidification range. The resin is introduced as the 100 wt% base olefinic carrier; masterbatch additions are restricted to 1–3 wt% white TiO₂ concentrate and 0.05–0.2 wt% slip/antiblock concentrate because higher additive loadings disturb the narrow molecular weight distribution and increase gate blush. Food-contact compliance for the finished article is established through FDA 21 CFR 177.1520 and EU Regulation No 10/2011, with an overall migration limit of 10 mg/dm²; lot release data are generated against ASTM D1238-23, ISO 1183-1:2019, ASTM D638-14, and ASTM D790-17. Production-scale injection moulding is run on accumulator-assisted presses with clamp force from 2,500 kN to 6,500 kN and screw L/D ratios of 20:1–24:1. Melt temperature is held at 200–230 °C, mould temperature at 10–25 °C, and injection speed is profiled from 150 mm/s to 250 mm/s for sections below 0.7 mm. Switchover is triggered by cavity pressure at 45–55 MPa, after which a short hold spike at 50–60 MPa decays to 30–40 MPa; a melt cushion of 3–5 mm is maintained because cushion loss below 3 mm produces check-ring leakage and shot weight drift. No predrying is required when closed-hopper storage is below 60% RH; open storage above that threshold requires 2–4 h hopper drying at 70–80 °C. Finished terminal products include 125–500 ml dairy cups, frozen dessert tubs, and snap-on deli lids.
| Wall thickness | Melt temperature | Mould temperature | Hold pressure | Injection speed |
|---|---|---|---|---|
| 0.5–0.7 mm | 200–220 °C | 10–20 °C | 40–55 MPa | 180–250 mm/s |
| 0.8–1.0 mm | 210–230 °C | 15–25 °C | 45–60 MPa | 120–200 mm/s |
| 1.1–1.5 mm | 215–240 °C | 20–30 °C | 50–70 MPa | 80–150 mm/s |
Why does cavity filling in snap-fit and tamper-evident closures require injection-speed profiling rather than a single-stage velocity?
Closure moulding with LP552-01 NARROW typically takes place in 16-cavity to 32-cavity valve-gated hot-runner tooling with unscrewing or collapsing-core ejection. The recurring production-scale failure mode is not short shots but skirt wall thickness variation between 0.35 mm and 0.7 mm caused by velocity-dependent jetting and gate freeze. Closure-grade formulations use 100 wt% virgin LP552-01 NARROW, 1–4 wt% custom colour concentrate, and 0.02–0.08 wt% external lubricant; amide-based slip additives are maintained below 0.15 wt% because excessive torque reduction compromises child-resistant removal torque. Regulatory conformity for pharmaceutical and nutraceutical closures is anchored to USP <661.1> physicochemical testing, FDA 21 CFR 177.1520 for food-contact caps, and EU Regulation No 10/2011 for caps sold into EU food-contact applications; child-resistant packaging is certified under ISO 8317:2015. The injection velocity profile is split into three segments: the gate region is filled at 80–120 mm/s, the skirt wall is filled at 180–250 mm/s, and the top panel is packed with a decaying profile from 45 MPa to 25 MPa. Hot runner nozzle temperature is held 5–10 °C above the melt temperature of 200–240 °C to prevent premature gate solidification; mould temperature is maintained at 10–30 °C. Cycle time is 6–10 s for 38 mm closures depending on wall thickness and hot-runner balance. Terminal closures include 28 mm and 33 mm tamper-evident beverage caps, 38 mm pharmaceutical caps, child-resistant caps, and nutraceutical closures.
Stackable storage totes and rigid housewares produced in high-cavity injection tools are the most warp-sensitive downstream segment for this narrow-MWD grade because thick ribs, bosses, and long flow lengths create differential shrinkage that cannot be corrected after demoulding. LP552-01 NARROW is used at 100 wt% virgin content or with 5–20 wt% closed-loop regrind for non-food articles, 1–3 wt% colour concentrate, and 0.1–0.5 wt% antioxidant masterbatch in outdoor service; polypropylene contamination is kept below 2 wt% because dispersed PP domains reduce weld-line strength in ribbed bases. Food-storage articles are evaluated under FDA 21 CFR 177.1520 and EU Regulation No 10/2011; general household articles fall under REACH (EC) No 1907/2006. The production process uses presses with clamp force from 3,500 kN to 12,000 kN, melt temperature 210–240 °C, mould temperature 15–35 °C, and shot volumes up to 2.5 L. Multi-stage hold pressure of 35–55 MPa is held for 15–35 s to pack large ribs and prevent sink marks; sequential valve gating or gas counter-pressure is employed when rib thickness exceeds 60% of nominal wall. Terminal products include stackable storage totes, drawer organizers, cutlery trays, shelf bins, and hangers.
When −20 °C drop impact governs cold-chain distribution containers
Cold-chain containers manufactured from LP552-01 NARROW are specified against sub-zero drop impact after 24 h conditioning at −20 °C. Published data for this specific container configuration is limited; therefore, lot qualification generally uses the Gardner impact method ASTM D5420-21 or the container drop test ASTM D5276-19, while cold-chain handling is assessed under ISTA 7E. The formulation for sub-zero service uses 100 wt% virgin LP552-01 NARROW, 2–4 wt% UV masterbatch, 0.05–0.1 wt% slip/antiblock concentrate, and regrind limited to 10 wt% because repeated heat histories tend to reduce low-temperature ductility. Food-contact requirements for fish boxes, meat trays, and dairy crates are established by FDA 21 CFR 177.1520 and EU Regulation No 10/2011. Process settings deliberately use the lower end of the melt temperature range, 190–210 °C, to limit thermal degradation, with mould temperature 15–25 °C; however, reduced melt temperature lowers weld-line strength, so injection speed is raised to 150–200 mm/s and vent depth is increased to 0.02–0.04 mm to avoid trapped gas burn marks. Corner wall thickness is held below 4 mm to control differential shrinkage and dimensional stability. Terminal products include fish boxes, dairy crates, cold-chain food-service totes, and distribution trays.
Regrind reincorporation and UN pail certification
Open-head pail and lid manufacturing is the high-shot-volume injection moulding segment in which LP552-01 NARROW functions either as the 100 wt% base resin or as the virgin portion in blends with 10–30 wt% in-house regrind. Non-food industrial pails can incorporate up to 30 wt% regrind, while food-grade pails are kept at or below 20 wt% regrind to preserve migration and mechanical consistency; colour concentrate is added at 2–3 wt%, and external processing lubricant at 0.1–0.2 wt%. Polypropylene contamination is limited to 2 wt% to avoid weld-line embrittlement at handle bosses. Regulatory compliance includes UN dangerous goods packaging under ADR/RID/IMDG, US DOT 49 CFR, FDA 21 CFR 177.1520 for food-grade pails, and EU Regulation No 10/2011 for food-contact pails sold into the EU; mechanical acceptance often references ISO 16101:2004 for transport packaging for dangerous goods. Production-scale equipment comprises large-tonnage injection presses with clamp force from 12,000 kN to 30,000 kN, shot volumes of 2,000–8,000 cm³, accumulator-assisted injection, melt temperature 210–240 °C, and mould temperature 15–30 °C. Sequential valve gating and multi-stage hold pressure at 45–60 MPa are required to control sink marks at the handle bosses; cooling time ranges from 18 s for 2.5 mm walls to 35 s for 4 mm walls. Terminal products include 5 L, 10 L, and 20 L open-head pails, pail lids with elastomeric gaskets, and industrial transport containers.
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- LyondellBasell HDPE LP552-01 NARROW 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 LP552-01 NARROW is a high-density polyethylene grade manufactured by LyondellBasell under a narrow molecular weight distribution specification. The resin is supplied as pellets for extrusion blow molding and is identified by the supplier as a narrow-MWD product, which indicates a lower weight-average to number-average molecular weight ratio than conventional broad-MWD blow molding HDPE at equivalent density. Published datasheet values include a melt flow rate of 0.55 g/10 min at 190°C under 2.16 kg load in accordance with ISO 1133-1:2022, and a density of 0.955 g/cm³ per ISO 1183-1:2019. The combination places the material in the medium-stiffness HDPE range used for small containers, bottles, and technical packaging, rather than large accumulator-head drum applications.
How Does Narrow MWD Modify Blow Molding Rheology Compared with Broad-MWD HDPE?
At constant density and melt flow rate, a narrow distribution reduces the elastic component of the melt during die exit. This produces lower parison swell, less curl, and a smoother parison surface when extruded through a convergent blow molding die. On shuttle machines, the lower swell permits a wider die gap for a given container neck calibration, reducing shear heating at the die lip. The trade-off is reduced extensional viscosity and melt strength; parison sag at a given parison weight and hang time is higher than that of broad-MWD grades with the same melt flow rate. Capillary rheometry data specific to this grade are limited in the standard datasheet, but published comparisons for narrow-MWD HDPE frequently show die swell reductions of 10–25% relative to broad-MWD resins at shear rates of 100–500 s⁻¹. Equipment selection therefore shifts toward single-station shuttle or rotary blow molders with parison programming, while accumulator-head machines used for containers above approximately 5 L are not the primary target.
On single-station shuttle blow molding lines with 24:1 L/D barrier screws, LP552-01 NARROW is run at melt temperatures between 180°C and 210°C, with die head temperatures set 5–10°C below the front barrel zone to stabilize parison dimensions. Mold temperatures between 10°C and 40°C are typical, with the lower end used to reduce cycle time and the upper end to improve surface gloss and reduce residual stress. The grade is not hygroscopic; absorbed moisture is typically below 0.01 wt%, so pre-drying is unnecessary unless pellets are stored in unheated silos where condensation can produce free surface moisture. Under these conditions, a desiccant hopper at 80°C for 2–3 h removes surface water before extrusion. Regrind from flash and tails is normally re-introduced at 10–20 wt%; regrind above 30 wt% on shuttle lines has been associated with greater MFR drift and parison tack variability.
Thermal Degradation Thresholds and Regrind Instability in HDPE LP552-01 NARROW
The processing window of LP552-01 NARROW is bounded at the upper end by the same chain-scission sensitivity that narrow-MWD polyethylenes exhibit after repeated extrusion. At melt temperatures above 210°C and residence times exceeding 5 min, the MFR can increase by 0.05–0.10 g/10 min per pass in continuous shuttle operation, an increase that shifts the material out of the specified melt flow range. This drift is more visible in narrow-MWD product because there is no high-molecular-weight tail to mask viscosity loss. Extruder barrel profiles should therefore avoid feed-zone temperatures below 140°C and melt-zone temperatures above 210°C, with screw speeds selected to keep melt pressure below the maximum rating of the extruder drive and back pressure below 25 MPa. The grade does not require pre-compounding; direct dry blending with HDPE-compatible pigment masterbatch at 2–4 wt% is common, but the use of high-shear static mixers in the die head can increase shear heating and reduce parison strength.
Environmental stress crack resistance testing follows ASTM D1693-15, with F50 failure times measured in 100% Igepal CO-630 at 50°C. Because narrow-MWD HDPE has fewer long-chain molecules available to form tie molecules between lamellae, ESCR at equivalent density is often lower than that of broad-MWD blow molding grades. Published F50 data for LP552-01 NARROW are lot-dependent and appear in the certificate of analysis rather than the generic datasheet; applications requiring aggressive detergent or surfactant storage should therefore be qualified by bottle compression and drop impact tests after storage. The material is not recommended for direct contact with strongly acidic oxidizers or polar solvents at elevated temperature unless converted parts are subjected to specific migration testing under the end-use conditions described in EU Regulation (EU) No 10/2011.
When Dimensional Tolerances and Shrinkage Outweigh ESCR in Small Technical Containers
In narrow-MWD HDPE, the absence of a high-molecular-weight tail reduces internal stress accumulation during cooling, so shrinkage after demolding is lower and more isotropic than in broad-MWD grades. This property is most relevant for technical containers requiring stackability, label registration, or snap-fit dimensions. For LP552-01 NARROW at 0.955 g/cm³ density, mold shrinkage is typically specified by the grade data in the range of 1.5–2.5%, with the final value governed by mold temperature and part thickness. Where a conventional broad-MWD blow molding grade may show differential shrinkage across a flat panel, the narrow distribution tends to produce less warpage in angular containers. The trade-off is that impact strength at low temperature and ESCR remain lower than broad-MWD grades at equal density; therefore, broad-MWD HDPE is substituted when freezer-temperature drop impact or prolonged surfactant contact is the dominant requirement.
Top-load compression tests on converted containers are performed in accordance with ASTM D2659 after conditioning at 23°C and 50% RH for 48 h. Typical applications include non-food detergent bottles below 1 L, technical oil containers, and thin-wall chemical packaging where container mass must be minimized while retaining stacking stiffness. The lower die swell allows neck calibration and thread formation with lower reject rates than broad-MWD blow molding grades. Published data for this specific configuration is limited for hot-filled applications; hot fill above 60°C is not recommended without dimensional stability testing because the modulus of HDPE declines measurably above the alpha transition temperature.
Regrind-induced gel formation on blow molding lines is a batch-to-batch variance issue with narrow-MWD HDPE when transition from a broad-MWD grade is incomplete. Purging with a lower-viscosity HDPE at 200–220°C and 10–20 rpm screw speed is recommended before feeding LP552-01 NARROW. Failure to purge can produce black specks and unmelts at the die exit, especially if the previous grade contains carbon black masterbatch or processing aid residues. A purge displacement of 2–3 barrel volumes is generally sufficient, verified by measuring the MFR of extrudate at 190°C/2.16 kg until the value stabilizes within 0.50–0.60 g/10 min.
| Regulatory domain | Standard or directive | Relevant provision | Status |
|---|---|---|---|
| European food contact | EU Regulation (EU) No 10/2011 as amended | Overall migration limit ≤ 10 mg/dm² | Manufacturer compliance statement required |
| United States food contact | FDA 21 CFR 177.1520(c) | Olefin polymer provisions | Compliance depends on end-use conditions and migration testing |
| Restricted heavy metals | RoHS Directive 2011/65/EU Annex II | Pb ≤ 0.1 wt%; Hg ≤ 0.1 wt%; Cd ≤ 0.01 wt%; CrVI ≤ 0.1 wt% | No intentional addition of restricted metals |
| Substances of very high concern | REACH Regulation (EC) No 1907/2006 | Candidate List SVHC ≤ 0.1 wt% | Supplier declaration of no SVHC above threshold |
When parison programming is unavailable on twin-station rotary machines, the lower melt strength of LP552-01 NARROW can produce unacceptable parison thinning at hang times greater than 2 s. Tooling changes from broad-MWD grades generally require die gap reductions of 0.2–0.5 mm to hold container mass within ±0.5 g. Processors should monitor melt temperature at the die exit with an immersion probe rather than relying on barrel set-points, because shear heating in the die head can raise the actual melt temperature by 3–8°C above the front barrel zone. Batch-to-batch variation in MFR outside the ±0.05 g/10 min window should trigger a reduction in regrind fraction or a decrease in screw speed.
