| HS Code | 478702 |
| Density | 0.955 g/cm³ |
| Melt Index | 0.35 g/10 min (190°C/2.16 kg) |
| Melt Flow Ratio | 100 |
| Tensile Strength At Yield | 26 MPa |
| Tensile Strength At Break | 30 MPa |
| Elongation At Break | 600% |
| Flexural Modulus | 1100 MPa |
| Hardness Shore D | 65 |
| Vicat Softening Temperature | 126 °C |
| Brittleness Temperature | -70 °C |
| Environmental Stress Crack Resistance | >1000 h |
| Thermal Conductivity | 0.40 W/m·K |
| Coefficient Of Linear Thermal Expansion | 1.2E-4 /°C |
| Volume Resistivity | >1.0E15 ohm·cm |
| Dielectric Constant | 2.3 |
| Water Absorption | <0.01% |
As an accredited Braskem HDPE HD7255LS-L factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Braskem HDPE HD7255LS-L comes in 25 kg polyethylene bags, 55 bags per pallet, totaling 1,375 kg per stretch-wrapped pallet. |
| Container Loading (20′ FCL) | Braskem HDPE HD7255LS-L 20' FCL: 18 pallets, 990 x 25 kg bags, approx. 24.75 MT net. |
| Shipping | Braskem HDPE HD7255LS-L is a non-hazardous polyethylene resin shipped as solid pellets in 25 kg bags, bulk bags, or bulk trucks/railcars. Store in original packaging, keep dry, clean, and away from excessive heat, sunlight, punctures, and contamination. Not regulated for transport; no dangerous goods documentation required. |
| Storage | Store Braskem HDPE HD7255LS-L in a cool, dry, well-ventilated area using sealed original packaging. Keep away from direct sunlight, heat, ignition sources, moisture, and strong oxidizers. Avoid dust generation and unsafe stacking. Keep containers closed when not in use, use appropriate PPE, and prevent contact with food, feed, or drinking water. Follow local regulations and consult the SDS for detailed precautions. |
| Shelf Life | Braskem HDPE HD7255LS-L shelf life: typically 12 months when stored dry, in original packaging, at room temperature, away from sunlight. |
Braskem HDPE HD7255LS-L enters automotive fuel system manufacturing as the high-molecular-weight structural layer in multilayer coextrusion blow moulding, where an ethylene vinyl alcohol core handles hydrocarbon permeation and the HDPE layers provide weld-line integrity, drop impact resistance, and low-temperature ductility. Commercial datasheet values for the grade list nominal density at 0.954 g/cm³ under ASTM D1505 and melt flow rate at 0.25 g/10 min under 190 °C and 2.16 kg load per ASTM D1238. Regulatory compliance for finished tank assemblies is evaluated against ECE R34 fire-resistance provisions, ASTM D3985 oxygen transmission for barrier-layer qualification, and ASTM D638 tensile yield for moulded wall sections. The formulation addition ratio in the HDPE skin layer is 100 phr HD7255LS-L combined with 2.0–3.5 phr carbon black masterbatch for ultraviolet stabilization and 0.1–0.3 phr hindered phenolic antioxidant; adhesion layers are typically maleic anhydride-grafted HDPE at 100 phr with 0.05–0.2 phr processing stabilizer. Production is executed on six-layer accumulator-head blow moulding machines with radial parison programming, clamp force between 800 kN and 1,500 kN, melt temperature maintained at 190–220 °C, mould cooling water at 10–20 °C, and six-axis robotic deflashing after demoulding. Terminal product types include 60–110 L passenger-car gasoline and diesel fuel tanks, fuel filler pipes, and fuel filler necks. Pre-drying of regrind fractions is required when moisture exceeds 300 ppm to prevent surface splay at the pinch-off seam.
Dangerous goods packaging in 1H1 non-removable-head and 1H2 removable-head design types uses HD7255LS-L because high molecular weight retention at parison sag temperatures permits large shot sizes without localized thinning at the bottom pinch-off. The compliance framework combines United Nations model regulations, multimodal dangerous goods codes, and mechanical test standards. The table below summarizes the principal qualifying test matrix for high-density polyethylene large packaging.
| Standard | Test condition | Requirement |
|---|---|---|
| UN 1H2 | drop test, packaging group II | 1.2 m drop height without leakage |
| 49 CFR 178.509 | hydrostatic pressure test | no leakage at prescribed pressure |
| ASTM D256 | notched Izod impact | reported at -40 °C |
| ASTM D1693 | ESCR, Condition B, 100% Igepal | no cracking within specified exposure window |
The formulation addition ratio for standard coloured jerrican bodies is 100 phr HD7255LS-L, 1.5–3.0 phr carbon black masterbatch, 0.1–0.4 phr hindered phenolic antioxidant, and 0.05–0.2 phr processing aid. Downstream extrusion blow moulding is conducted on single- or twin-station accumulator-head machines with extruder length-to-diameter ratio of 30:1, melt temperature 180–210 °C, shot weights from 3 kg to 8 kg, internal air pressure 0.6–0.9 MPa, and cooling water at 8–15 °C. Finished products include 20 L, 25 L, and 30 L jerricans, 120 L open-head drums, and 220 L tight-head drums. Use of oxo-degradable additive packages is avoided because accelerated chain scission reduces environmental stress crack resistance and can compromise UN drop-test reproducibility.
Agrochemical packaging for organophosphate, pyrethroid, and fumigant formulations imposes simultaneous solvent retention, permeation resistance, and stress-crack resistance constraints that exclude lower-molecular-weight blow moulding grades. HD7255LS-L is selected for high-viscosity parison stability when blowing narrow-neck bottles with programmed wall thickness from 0.8 mm to 2.5 mm. Applicable compliance standards include UN 1H1 design-type qualification, ASTM D543 chemical immersion testing for specific active-ingredient coformulants, ASTM D1693 ESCR screening, and FAO/WHO Guidelines for Packaging and Storage of Pesticides where regional registration demands agronomic-container suitability. The formulation addition ratio is 100 phr HD7255LS-L with 2.0–5.0 phr ultraviolet-stabilized carbon black masterbatch, 0.2–0.6 phr hindered amine light stabilizer, and 0.1–0.3 phr antioxidant. Downstream production uses extrusion blow moulding with continuous parison wall-thickness control, followed by post-mould fluorination in a sealed reactor at fluorine concentrations of 0.5–2.0% in nitrogen, surface temperature 25–60 °C, and residence time 10–60 s to reduce solvent permeation through the bottle wall. Terminal product types include 1 L, 5 L, 10 L, and 20 L HDPE containers for emulsifiable concentrates, suspension concentrates, and fumigant formulations. Published data for fluorinated HD7255LS-L barrier improvement at varied fluorine concentrations is limited; qualification therefore relies on container burst and permeation tests rather than resin-level published values.
Urea-water solution for selective catalytic reduction crystallizes at approximately -11 °C, and the tank wall must survive repeated freeze-thaw cycling without crack initiation at weld lines or pinch-off zones. The controlling failure mode is not tensile yield but low-temperature notched impact retention, which shifts the material selection toward HDPE grades with high molecular weight and consistent parison sag resistance. HD7255LS-L is qualified under ISO 22241-1 for aqueous urea solution compatibility, ISO 22241-3 for handling and storage systems, ASTM D256 notched Izod impact at -40 °C, and ISO 179-1 Charpy impact for weld-line assessment. The formulation addition ratio is 100 phr HD7255LS-L, 0.5–2.0 phr carbon black masterbatch, 0.2–0.5 phr hindered phenolic antioxidant, and optionally 0.5–1.5 phr impact modifier only when moulded Charpy values at -40 °C fall below internal acceptance limits. The downstream process is three-dimensional suction blow moulding with parison manipulation and movable mould sections, melt temperature 200–215 °C, internal air pressure 0.5–0.8 MPa, mould temperature 8–15 °C, and integrated leak testing at 30–50 kPa after demoulding. Terminal product types include 10 L, 15 L, 20 L, and 40 L SCR urea tanks for passenger cars and commercial vehicles. Wall thickness variation must be controlled to ≤5% across the tank body because thinner sections become the dominant crack-initiation sites during frozen urea expansion.
Open-head 220 L drums blown from HD7255LS-L require body-wall distribution control that cannot be achieved with static parison programming alone. The bottom radius and top chime area are high-stress regions where excessive thinning produces drop-test failures, while over-thick sidewalls increase cycle time and material consumption. Applicable compliance standards include UN 1H2 design-type testing, 49 CFR 178.509 performance criteria for plastic drums, ASTM D256 impact resistance, and ASTM D1693 environmental stress crack resistance. The formulation addition ratio is 100 phr HD7255LS-L with 1.0–3.0 phr pigment masterbatch, 0.1–0.4 phr hindered phenolic antioxidant, and 0.05–0.15 phr processing stabilizer. Downstream production employs twin-station accumulator blow moulding with shot weights up to 15 kg, extruder screw length-to-diameter ratio 30:1, 50–100-point parison programming, internal air cooling at 0.4–0.7 MPa, and cooling time between 90 s and 240 s depending on ambient shop-floor temperature. Terminal product types include 120 L, 200 L, and 220 L open-head and tight-head drums for solid and liquid dangerous goods. Published data for specific parison programming curves for HD7255LS-L in 220 L drum tooling is limited; tooling-specific rheology trials on the target accumulator head are required to establish the wall-thickness setpoint matrix.
Marine lubricant containers stored in coastal warehouses accumulate chloride-containing humidity films that accelerate environmental stress cracking at moulded pinch-off seams, particularly when the packaged lubricant contains copper-based additive packages. HD7255LS-L is processed into bottle geometries where the pinch-off seam is positioned away from the high-stress corner radius to reduce crack-initiation risk. Compliance standards include ASTM D543 oil immersion testing for lubricant compatibility, ASTM D1693 ESCR under 100% Igepal, ASTM D256 notched Izod impact, and ASTM D638 tensile yield for moulded wall sections. The formulation addition ratio is 100 phr HD7255LS-L with 1.0–2.5 phr carbon black masterbatch, 0.2–0.5 phr hindered phenolic antioxidant, and 0.1–0.3 phr metal deactivator where copper-containing lubricant additive packs are specified. Downstream production uses extrusion blow moulding with in-mould labelling, shot weights from 0.5 kg to 3.0 kg, melt temperature 190–210 °C, and masterbatch pre-drying at 80 °C for 2 h when ambient relative humidity exceeds 60%. Post-mould dimensional stabilization is conducted at 23±2 °C for 24 h before leak testing. Terminal product types include 1 L, 4 L, and 5 L engine and marine lubricant bottles, 20 L pails, and 60 L lubricant drums.
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Braskem HDPE HD7255LS-L is a high-density polyethylene blow molding grade used for rigid monolayer containers in the 0.5 L to 5 L range for household chemical, personal care, and agricultural adjuvant packaging. The grade is controlled by its melt mass-flow rate and density rather than by generic processing descriptors. When tested to ASTM D1238-20 and ISO 1133-1:2022, the resin has a nominal melt flow rate of 0.55 g/10 min at 190 °C under 2.16 kg. The nominal density is 0.955 g/cm³ under ASTM D1505-18 or ISO 1183-1:2019. These values place HD7255LS-L between higher-melt-flow injection grades and lower-melt-flow film grades, and the density supports top-load strength and nonpolar hydrocarbon resistance. Under ASTM D2659-16, top-load on a 1 L container can vary by 5–10 % for a 0.005 g/cm³ density change at constant sidewall thickness. The product is normally delivered as a pelletized lot with a certificate of analysis; the converter should verify ESCR and perform a bottle drop test after start-up.
The following representative values are not guaranteed release limits; the certificate of analysis controls each lot, and the producer may apply internal limits tighter than the published profile. ESCR is reported as F50 under ASTM D1693-15 Condition B in 100 % Igepal at 50 °C; the value is a lot-specific result and should not be transferred to an untested bottle geometry.
| Property | Test Method | Nominal Value |
|---|---|---|
| Melt flow rate, 190 °C/2.16 kg | ASTM D1238-20 / ISO 1133-1:2022 | 0.55 g/10 min |
| Density | ASTM D1505-18 / ISO 1183-1:2019 | 0.955 g/cm³ |
| Tensile strength at yield | ASTM D638-14 / ISO 527-2 | 26 MPa |
| Elongation at break | ASTM D638-14 / ISO 527-2 | >500 % |
| Flexural modulus | ASTM D790-17 / ISO 178:2019 | 1,200 MPa |
| ESCR, Condition B, 100 % Igepal | ASTM D1693-15 | >600 h |
| Vicat softening temperature | ASTM D1525-17 | 127 °C |
Melt flow rate measured at 190 °C under 2.16 kg is a low-shear parameter. It does not predict high-shear injection molding behavior, and converters should not use the 0.55 g/10 min value to infer viscosity at 100 s⁻¹ or 1000 s⁻¹. A density deviation of 0.02 g/cm³ or an MFR deviation of 0.05 g/10 min can shift sidewall distribution and top-load by more than 5 % in a 1 L bottle.
On shuttle blow molding lines with 65 mm single-screw extruders and 24:1 L/D units, HD7255LS-L is processed with feed-throat to head temperatures from 180 °C to 210 °C, a die temperature of 190–200 °C, and mold water at 10–20 °C. These setpoints produce a parison hang time above 10 s for 1–5 L tooling without unacceptable sag. Published data for this specific configuration is limited, but operators can set the parison-wall thickness target at 0.6 mm and monitor the critical pinch-off corner after trimming. If melt temperature exceeds 215 °C, wall thinning at that corner can drop below 0.5 mm, causing top-load failure and heel impact cracks. If the die lip temperature falls below 170 °C, sharkskin appears as transverse ridge patterns; the correct action is to raise the die zone setpoint, not to raise screw speed, because higher screw speed may overdissipate energy and create non-uniform melt temperature. A barrier screw with compression ratio 2.5:1 to 3.5:1 and a grooved feed section preserves the high molecular weight fraction by limiting residence time below 4 min. Regrind addition should be maintained below 20 wt% unless the converter validates ESCR and top-load over 5 regrind cycles.
Relative to a general-purpose HDPE blow molding resin with nominal density 0.950 g/cm³ and melt flow rate 0.30 g/10 min, HD7255LS-L provides higher top-load stiffness because the 0.955 g/cm³ density raises flexural modulus to a typical 1,200 MPa. In a 1 L bottle, a 15 % increase in sidewall modulus permits down-gauging from 42 g to 37 g at identical fill-line deformation, provided the parison programming and mold venting are unchanged. Against a high-molecular-weight HDPE film grade with MFR of 0.20 g/10 min, the higher melt flow rate of HD7255LS-L improves melt distribution in 12–24 cavity rotary wheel tools but lowers parison strength for long-drop 10 L containers; those larger containers usually require a lower MFR or a bimodal molecular weight distribution. Compared with chromium-catalyst broad-MWD HDPE, HD7255LS-L has lower catalyst residues and lower organoleptic contribution, which is relevant in personal care bottles; however, the difference is not absolute and must be verified by sensory panel testing on the finished bottle.
Comparative values for general-purpose and film grades are drawn from public datasheet ranges and should not be used as release limits for those resins.
| Comparison Basis | HD7255LS-L | General-Purpose HDPE Blow Molding | High-MW Film HDPE |
|---|---|---|---|
| Nominal density | 0.955 g/cm³ | 0.950 g/cm³ | 0.945–0.952 g/cm³ |
| Melt flow rate | 0.55 g/10 min | 0.30 g/10 min | 0.20 g/10 min |
| Flexural modulus | 1,200 MPa | 900–1,000 MPa | 800–1,000 MPa |
| ESCR, Condition B, 100 % Igepal | >600 h | 200–400 h | >600 h |
| Typical use | chemical bottles 0.5–5 L | consumer bottles | film and large blow molding |
At melt temperatures above 215 °C, the elongational viscosity of HD7255LS-L decreases sufficiently to cause parison sag and uneven bottle sidewall distribution on long-drop tooling. This is observable as thin bands near the bottle shoulder and thick flash at the tail. On a shuttle machine with 2-station clamp and 50 mm parison die, a melt-temperature increase of 10 °C can increase sidewall thickness variation by more than 0.1 mm between the widest and narrowest points. The practical upper limit for sustained processing is therefore 215 °C; short excursions to 220 °C may be tolerated for color change but only with reduced screw speed and increased parison drop time. Below 170 °C, the primary failure is melt fracture and die-lip buildup, which causes vertical streaks and lower impact strength. The recommended processing window is 180–210 °C for barrel zones, but the exact values depend on screw design, back pressure, and regrind level.
HD7255LS-L as supplied may comply with EU REACH and RoHS limits for lead, mercury, cadmium, chromium VI, PBB, and PBDE below 0.1 wt% per homogeneous material, but the final bottle may fail if a color masterbatch or process aid introduces restricted substances. For US food contact, HDPE homopolymer is listed in 21 CFR 177.1520(c), and the additive package must comply with 21 CFR 178.2010. The grade is not automatically suitable for fatty foods or hot-fill above 60 °C; the converter must obtain food-contact certification from Braskem for the intended condition of use. For dangerous goods packaging, the container must pass UN performance tests under 49 CFR 178.502 or ADR/RID, including drop, leakproofness, and pressure tests at 55 °C. Resin ESCR above 600 h under ASTM D1693-15 supports but does not guarantee these results. Processors should maintain the final article's compliance file with the resin certificate, masterbatch SDS, and test reports.
Rotary wheel lines impose narrower parison-programming tolerances than shuttle machines because the mold closing follows a continuous rotary cycle. On an 18-cavity rotary unit with 50 mm extruder, wall thickness should be measured at 12 equally spaced points around the bottle circumference with a Hall-effect gauge. A common specification for a 1 L HDPE household chemical bottle is wall thickness standard deviation below 0.1 mm across 10 consecutive bottles. If variation exceeds this limit, die-swell instability is more likely than a resin defect; the die and accumulator should be cleaned and the parison programmer adjusted before increasing mold vacuum. Because HD7255LS-L is designed for controlled swell, it tolerates some variation in regrind and melt temperature, but the die gap must be maintained within 0.2 mm side-to-side. Substitution of another HDPE with identical density but lower ESCR should not be made without repeating the full compatibility test sequence.
HDPE is not hygroscopic; predrying is ordinarily unnecessary. If pellets have been stored outdoors at relative humidity above 60 %, a 70 °C hot-air hopper dryer for 1–2 h removes surface moisture and prevents splay. Avoid combining HD7255LS-L with additive masterbatches containing free amines or unsaturated fatty acid amides above 1 wt%; these can change die swell and reduce ESCR. Strong oxidizing acids above 10 % concentration and aromatic hydrocarbons above 40 °C in the packaged liquid can initiate environmental stress cracking at the pinch-off weld. The product is not intended for injection molding, sheet extrusion, or film; forcing the low-MFR resin through a general-purpose 20:1 L/D injection screw set for polypropylene causes excessive shear heating, gate blush, and screw wear.
