| HS Code | 288128 |
| Polymer Type | High Density Polyethylene (HDPE) |
| Grade Type | Blow Molding Grade |
| Melt Index 190c 2 16kg | 0.35 g/10 min |
| Density | 0.955 g/cm³ |
| Tensile Strength At Yield | 26 MPa |
| Elongation At Break | >600% |
| Flexural Modulus | 1100 MPa |
| Vicat Softening Temperature | 124 °C |
| Environmental Stress Crack Resistance | >1000 h |
| Brittleness Temperature | < -70 °C |
| Melting Point | 133 °C |
| Hardness Shore D | 62 |
| Crystallinity | 65% |
| Thermal Conductivity | 0.43 W/m·K |
As an accredited Bayport Polymers (Baystar) HDPE 5502 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Bayport Polymers (Baystar) HDPE 5502 is supplied as pellets in 25 kg polyethylene-lined bags, palletized, or 1,000 kg bulk bags. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Bayport Polymers (Baystar) HDPE 5502 in palletized bags, securely stowed, sealed, and ready for export shipment. |
| Shipping | Bayport Polymers (Baystar) HDPE 5502 is a non-hazardous high-density polyethylene resin. It typically ships as pellets in 25-kg bags, 1,000-kg supersacks, or bulk trucks/railcars. No DOT/IMDG placards or UN number are required. Store dry, cool, away from ignition sources and oxidizers. |
| Storage | Store Bayport Polymers (Baystar) HDPE 5502 in a cool, dry, well-ventilated area, away from direct sunlight, heat, ignition sources, and incompatible oxidizers. Keep original bags or containers closed and palletized to prevent moisture, dust, and contamination. Avoid excessive stacking and physical damage. Follow the manufacturer’s SDS and local regulations for safe handling and storage. |
| Shelf Life | Stable indefinitely when stored cool, dry, sealed, and away from direct sunlight and heat; no expiration if packaging remains intact. |
| Application | Standard or restriction | Boundary condition |
|---|---|---|
| Heavy-gauge sheet and thermoformed industrial parts | ASTM D638-14, ASTM D790-17, FDA 21 CFR 177.1520(c) where food contact is declared | Conditioning at 23±2°C and 50% RH for 40 h before destructive testing |
| Geomembrane lining and welded seams | GRI GM13, ASTM D5397-20, ASTM D3895-19 | NCTL testing in 10% Igepal CO-630 at 50°C; oxidative induction time at 200°C with 35 mL/min oxygen |
| Blow moulded UN-rated containers | 49 CFR 178.603, 49 CFR 178.604, 49 CFR 178.606 | Drop, leakproof, and stack testing on filled assemblies at 23°C and −18°C where hazard class requires |
| Spiral-wound storage tanks and fabricated fittings | DVS 2207-1, ISO 21307 | Butt-fusion interfacial pressure 0.15–0.25 MPa measured at the upset bead |
| Profile extrusion for marine and agricultural impact surfaces | ASTM D638-14, ASTM D256-10 | Notched Izod impact at −30°C where low-temperature impact is specified |
Competitive Bayport Polymers (Baystar) HDPE 5502 prices that fit your budget—flexible terms and customized quotes for every order.
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Bayport Polymers (Baystar) HDPE 5502 is a high-molecular-weight high-density polyethylene copolymer produced with a bimodal molecular weight distribution. The nominal density is 0.955 g/cm³ when measured according to ISO 1183-1, and the nominal melt flow rate at 190 °C under 2.16 kg load is 0.20 g/10 min when measured according to ISO 1133-1:2022. The grade is intended for extrusion blow molding of rigid containers, jerricans, and industrial chemical packaging, where parison melt strength and environmental stress crack resistance are more critical than short cycle-time injection molding flow.
The pelletized product is characterized by lot release data covering density, melt flow rate, and additive levels. Because mechanical properties depend on specimen molding and conditioning, incoming resin qualification should be performed under the test methods specified in the converter’s quality plan. The primary specification controls are listed below.
| Property | Test method | Nominal value |
|---|---|---|
| Density | ISO 1183-1 | 0.955 g/cm³ |
| Melt flow rate (190 °C, 2.16 kg) | ISO 1133-1:2022 | 0.20 g/10 min |
These two values define the specification envelope for many extrusion blow molding applications. Additional mechanical and rheological values are available as typical values, but repeatability is controlled by conditioning at 23 °C and 50% relative humidity.
In a bimodal HDPE, the high-molar-mass fraction contributes to impact toughness, ESCR, and melt strength; the low-molar-mass fraction reduces overall shear viscosity during die flow. This architecture is measured by gel permeation chromatography or by the ratio of high-load melt flow rate to melt flow rate. For HDPE 5502, the curve shape creates a broader molecular weight distribution than a single-reactor monomodal resin of the same density. This broadening is not a processing defect; it is the structural basis for combining high parison hang strength with acceptable die head pressure.
During capillary rheometry under ISO 11443, the grade exhibits shear thinning; apparent shear viscosity decreases as the shear rate rises through the 100 s⁻¹ to 1000 s⁻¹ range. The low-shear viscosity remains high enough to limit parison drawdown, while the high-shear viscosity drops sufficiently for accumulator-head extrusion. Published lot-specific viscosity curves for this product are limited, and converters should request capillary rheometry data before retrofitting an existing extrusion head.
On accumulator-head extrusion blow molding machines with 24:1 to 30:1 L/D single-screw extruders, start-up conditions are typically set with barrel temperatures from 180 °C to 220 °C and head tooling temperatures from 190 °C to 210 °C. The die gap for large-part parison formation commonly falls between 1.5 mm and 3.0 mm, and wall-thickness control is accomplished through parison programming rather than static die gap. Mold cooling water temperatures from 10 °C to 40 °C are used depending on part wall thickness; chillers must be sized to remove heat from a 0.955 g/cm³ high-density polyethylene with a peak melting temperature near 130 °C. At high screw speeds, the melt temperature should be monitored by an immersion probe because melt compression heating can raise actual temperature by 5 °C to 15 °C above barrel set point.
Parison sag is controlled by die swell and melt strength. The bimodal structure of HDPE 5502 produces greater sag resistance than monomodal grades with comparable melt flow rate; however, sag is also influenced by melt temperature, parison weight, and hang time. Operators should map sag versus hang time at each job setup using a video extensometer or manual length measurement. A parison length increase of more than 10% over a 20 s hang time is generally addressed by lowering melt temperature or selecting a higher-molar-mass fraction rather than by adding filler.
Tooling for HDPE 5502 requires pinch-off zones that produce a clean weld seam. Blunt pinch-off inserts or insufficient squeeze pressure cause weak welds that are detectable as a drop in burst strength and as oriented stress whitening. Pinch-off gaps for high-molecular-weight HDPE are typically 0.1 mm to 0.3 mm less than nominal parison thickness at the weld, depending on part weight and mold clamp alignment. Mold venting must remove entrapped air at the parting line; inadequate venting appears as surface dimples at the last fill point and can reduce top-load strength under ASTM D2659.
Wall thickness distribution is controlled by parison programming. For large jerricans, the program is usually divided into 20 to 50 points, with the thickest segment placed near the pinch-off and the thinnest segment near the neck or handle areas. Deviations in wall thickness of more than ±10% from the target profile can produce top-load inconsistency. On twin-station shuttle machines with two molds, cavity-to-cavity variation should be measured by sectioning finished containers at defined measurement points using ultrasonic wall thickness gauges.
Blow-up ratios in blow molding are typically maintained between 2:1 and 4:1 for this product class. Outside this range, wall-thickness control becomes difficult and the part may fail top-load under ASTM D2659 or drop impact under ASTM D2463.
Pneumatic conveying systems for HDPE 5502 should be designed to minimize angel hair. Dilute-phase conveying velocities above 25 m/s can generate fines and streamers that reduce flowability and can create melt blockages at the feed throat. Dense-phase conveying or lower conveying velocities below 18 m/s are preferred for this high-molecular-weight pellet.
Environmental stress crack resistance under ASTM D1693 is affected by comonomer type and placement, molecular weight, and the high-molecular-weight tail. Two HDPE products with identical 0.955 g/cm³ density can differ significantly because density alone does not capture tie-molecule concentration. The bimodal design of HDPE 5502 is intended to preserve tie molecules between crystalline lamellae while the lower-molecular-weight fraction improves processability. The standard bent-strip test uses a controlled surface-active environment at constant strain; failure time is recorded as F50, the time at which 50% of specimens fail, or F0, the first failure. Published lot-specific values should be obtained from the supplier certificate of analysis, because ESCR test scatter is high and results are sensitive to specimen thickness, notch geometry, and aging.
For rigid chemical containers, ESCR is a more discriminating performance indicator than tensile yield stress. A grade may pass a ASTM D638-14 tensile yield specification yet fail under stress cracking conditions in the field. When HDPE 5502 is used in containers for aggressive surfactants, the converter should pre-qualify the finished article using the relevant industry protocol, such as a filled-container exposure test at 40 °C to 60 °C for 14–30 days. No single ESCR value replaces full package compatibility testing.
Substitution of HDPE 5502 for a monomodal resin of the same nominal density is not a direct drop-in change. The bimodal molecular weight distribution typically increases die swell, parison hang strength, and low-shear viscosity at equivalent melt flow rate. The high-load melt flow rate should be compared using ISO 1133-1:2022 at 190 °C and 21.6 kg load; a lower high-load value relative to the incumbent grade indicates that the melt will require higher head pressure. On single-screw extrusion blow molding machines, this may appear as a die pressure increase of several percent at constant screw speed. If the available extruder motor load is already above 85% of nameplate capacity, the substitution should be evaluated with a rheological study before production trials.
Because HDPE 5502 is designed for blow molding, its low melt flow rate of 0.20 g/10 min under 2.16 kg makes it unsuitable for thin-wall injection molding tools requiring long flow lengths. Injection-molding HDPE grades often have melt flow rates above 5 g/10 min; using a blow molding grade in such tools can lead to short shots, high clamp force demand, and excessive orientation. The density difference relative to lower-density 0.949 g/cm³ blow molding copolymers provides higher top-load strength but may reduce low-temperature impact. Conversely, relative to higher-density 0.958 g/cm³ grades, the 0.955 g/cm³ density offers a different balance of stiffness and ESCR. These substitutions should be validated by top-load testing under ASTM D2659 and drop impact under ASTM D2463.
Material handling for HDPE 5502 is less intensive than for hygroscopic engineering resins. However, pellets exposed to condensation or stored in outdoor silos with temperature cycles can carry surface moisture that produces splay or bubbles in the parison. If the ambient relative humidity exceeds 60%, drying with a desiccant-bed hopper dryer at 80 °C for 2 h to 4 h with a dew point of -20 °C or lower is applied before extrusion. The grade is not classified as highly hygroscopic; moisture-related defects are usually intermittent and occur only when cold pellets are transferred into a warm production bay.
For food-contact packaging, converters must verify the resin formulation against the relevant regulatory instrument, such as FDA 21 CFR 177.1520(c) for olefin polymers or Commission Regulation (EU) No 10/2011 as amended. Compliance is not automatically conferred by the resin if color concentrates, processing aids, or multilayer tie resins alter the overall migration profile. For industrial chemical packaging, compatibility tests with the target chemical are required because stress cracking resistance is chemical-specific and temperature-dependent.
Post-consumer recyclate blends are possible on extrusion blow molding lines if the recyclate is clean, compatibilized olefinic material and if the melt flow rate ratio is controlled. Addition of recyclate above 30 wt% may reduce ESCR and swell consistency; published data for this specific product configuration is limited. Processors should conduct a full lot trial and measure drop impact under ASTM D2463, top load under ASTM D2659, and stress cracking under ASTM D1693 before commercial use.
Baystar HDPE 5502 is optimized for blow molding, not for high-shear compounding or cast film. On twin-screw compounding extruders with high L/D ratios and severe screw elements, the broad molecular weight distribution can generate excessive melt temperature and gel formation if local residence time is prolonged. Published data for this specific configuration is limited. If the grade is used as a base resin for masterbatch or filled compounds, the screw design should use distributive mixing elements at moderate shear rates rather than high-intensity kneading blocks, and the melt temperature should be kept below 240 °C to limit thermo-oxidative degradation. Color concentrates that catalyze oxidation can reduce oxidative induction time measured under ASTM D3895; therefore, the final compound should be tested after pigmentation if the container is intended for outdoor storage.
