| HS Code | 480555 |
| Density | 0.960 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 8.0 g/10 min |
| Tensile Strength At Yield | 28 MPa |
| Tensile Modulus | 1200 MPa |
| Elongation At Break | 600% |
| Charpy Notched Impact Strength 23 C | 5 kJ/m² |
| Vicat Softening Temperature | 75 °C |
| Melting Temperature | 130 °C |
| Thermal Conductivity | 0.4 W/m·K |
| Water Absorption | 0.01% |
| Volume Resistivity | 1.00e+16 ohm·cm |
As an accredited Borealis HDPE HE6081 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE HE6081 is packaged in 25 kg polyethylene bags, palletized, stretch-wrapped, and labeled for secure industrial transport. |
| Container Loading (20′ FCL) | Borealis HDPE HE6081 is loaded in 20′ FCL as palletized 25 kg bags, shrink-wrapped and secured for safe ocean transport. |
| Shipping | Borealis HDPE HE6081 is a non-hazardous high-density polyethylene shipped as pellets in 25 kg bags, octabins, or bulk trucks/railcars. It is not classified as dangerous goods for transport. Keep dry and away from heat, sunlight, and oxidizing agents. Ensure closed, intact packaging and comply with local regulations. |
| Storage | Store Borealis HDPE HE6081 in original, closed packaging in a clean, dry, well-ventilated warehouse. Keep away from direct sunlight, heat, ignition sources, and strong oxidizers. Protect from moisture, dust, odors, and contamination. Use pallets and good housekeeping to prevent spills and slipping. Maintain ambient temperature, avoid prolonged UV exposure, and follow first-in, first-out stock rotation. |
| Shelf Life | Borealis HDPE HE6081 has a recommended shelf life of approximately two years when stored dry, sealed, and protected from heat and sunlight. |
In carbonated soft-drink closure production, Borealis HE6081 is processed as a high-flow HDPE base resin with a melt flow rate of 8.0 g/10 min at 190°C/2.16 kg and a density of 0.961 g/cm³ under producer datasheet methods ISO 1133-1:2022 and ISO 1183-1:2019. The material is formulated neat in one-piece tamper-evident closures, with a polyethylene-based colour masterbatch metered at 1.0–2.0 wt% and a slip/processing aid masterbatch at 0.05–0.10 wt% only when removal torque reduction is required; clean process regrind from sprues and rejected caps can be reintroduced at 10–20 wt%, but only after metal detection and fine-particle screening because CSD closure performance depends on consistent sealing plug collapse force, tamper-evident band elongation, and environmental stress crack resistance. Predrying is not required under normal closed silo storage; when pellets are exposed to ambient air at relative humidity above 60%, condensation on the cold granule surface can cause splay, in which case drying at 80°C for 1–2 h is applied. Food-contact compliance for the closure shell rests on Regulation (EU) No 10/2011 with its overall migration limit of 10 mg/dm², 21 CFR 177.1520 for olefin polymers in the United States, and EC 2023/2006 for good manufacturing practice; closure-specific performance is additionally verified against International Society of Beverage Technologists closure testing protocols for CO2 retention, removal torque, and stress crack resistance. On production-scale injection moulding lines, the resin is plasticised in a reciprocating screw with an L/D ratio of 20:1–22:1 and a compression ratio of 2.2:1–2.8:1, with barrel temperatures set from 190°C in the feed section to 235°C at the nozzle, while mould temperatures are kept at 10–18°C to reduce post-demoulding shrinkage and anisotropic thread ovality. High injection speeds of 120–200 mm/s and hold pressures of 60–80 bar above cavity pressure are common for multi-cavity closure tools, and the resulting terminal parts include 28 mm PCO 1881 closures, 30/25 mm short-height CSD closures, and one-piece tamper-evident variants with internal plug seals.
The transition from carbonated to still-water closure geometry reduces the need for high CO2 retention but increases sensitivity to thread dimensional drift after demoulding, especially when closure weight is reduced below 2.0 g. In this application, Borealis HE6081 is formulated with 2.0–3.0 wt% colour masterbatch and an external lubricating masterbatch at 0.05–0.15 wt% to stabilise removal torque on high-speed capping lines; if an unlined closure is required, a blend with 5–10 wt% of a tougher linear low-density polyethylene is used to improve strip torque consistency on polyethylene terephthalate neck finishes without altering the food-contact status of the shell. Regulatory compliance includes Regulation (EC) No 1935/2004, Regulation (EU) No 10/2011, and 21 CFR 177.1520; for still-water and aseptic beverage packaging, organoleptic taint testing is commonly conducted using EN 1622 threshold odour and flavour procedures for water in contact with the closure, while migration testing follows the food simulant assignment rules in 10/2011 Annex III for aqueous and low-acid beverages. The downstream process uses high-cavitation injection moulding tools with 48–64 cavities and valve-gated hot runners to prevent stringing at reduced part weight; melt temperature is typically 220–240°C, mould temperature is held at 8–15°C, and total cycle time from injection to ejection is 4–6 s for closure weights of 1.8–2.5 g. Screw decompression is set to minimise drool without pulling air into the melt, and hot-runner tip temperatures are trimmed independently to avoid gate vestige on the sealing plug. The terminal finished products are 29/25 mm, 30/25 mm, and 26.7 mm still-water closures, aseptic juice and tea closures, and sport-cap overcaps.
Thin-wall dairy lid production imposes a demoulding constraint that differs from beverage closure moulding in two respects: the melt must fill a large flow length at wall thicknesses near 0.4–0.8 mm, and the frozen part must release cleanly from a highly polished tool at low mould temperatures without producing sink marks on the visible surface. Borealis HE6081 is used neat or with 2.0–4.0 wt% pigment masterbatch; for refrigerated dairy applications requiring low-temperature impact resistance, 10–15 wt% of a butene- or hexene-based linear low-density polyethylene is added only after migration and sensory testing confirm that the blend remains within overall and specific migration limits. Compliance is assessed under Regulation (EU) No 10/2011, 21 CFR 177.1520, and EC 2023/2006; where dairy processors apply hygienic design principles, lids are inspected under their own packaging contaminant protocols rather than a separate EU packaging standard. The production process is thin-wall injection moulding using a high-flow screw with L/D of 20:1–24:1 and a shut-off nozzle to prevent drooling, with melt temperature set at 220–250°C, mould temperature at 8–12°C, and fill time below 0.3 s for thin lids; clamping force is sized to the projected area and stack-mould cavitation, typically 300–500 t for 8–16 cavity stack tools. Published data for this specific configuration is limited, and production trials should verify whether the thin-wall filling window remains stable at the lower end of the weight range. Terminal parts include thin-walled yogurt and cream-cheese tub lids, portion-cup lids for food service, and snap-on dairy container lids.
Cosmetic and personal-care closure lines using HE6081 are configured around high-gloss surface replication rather than sealing plug geometry, although the same high-flow HDPE can produce thin-walled overcaps and flip-top closures with sufficient dimensional stability for snap engagement. The formulation is typically 100% HE6081 with 1.0–3.0 wt% colour or special-effect masterbatch and 0.05–0.20 wt% slip/anti-block masterbatch to reduce visible scuffing during automated assembly; mineral or talc fillers above 1.0 wt% are avoided because they degrade surface clarity and increase gate blush on high-polish cavities. Regulatory requirements include EU Packaging and Packaging Waste Directive 94/62/EC for heavy metal limits, Regulation (EC) No 1907/2006 REACH for substances of very high concern, and, where personal-care closures may contact food-like oral-care formulations, 21 CFR 177.1520 or Regulation (EU) No 10/2011 as relevant. The downstream process uses injection moulding machines with polished tool steel cavities, often with multi-axis robots for closure handling; melt temperature is maintained at 215–240°C, mould temperature at 10–25°C, and gas-counterpressure or high-speed injection may be used to improve texture replication on matte or engraved surfaces. Post-moulding adhesion of UV-curable coatings or pad printing can be impaired if high levels of migratory slip additives are used, so the slip masterbatch level is kept at the lowest functional point. Terminal articles include outer caps for perfume bottles, lotion pump collars, cosmetics jar overcaps, and flip-top caps for personal-care tubes.
In rectangular food-storage lids with long flow paths, HE6081 is selected for flow length and low warpage after ejection, but the process must balance packing pressure against sink marks around sealing ridges. Addition ratios are generally 100% neat resin or a blend containing up to 20 wt% clean post-industrial regrind, with colour masterbatch at 2.0–3.0 wt%; if the lid is intended for microwave or freezer use, no migratory plasticiser or external oil is added, and the formulation remains based on the base HDPE and pigment carrier. Food-contact compliance is demonstrated under Regulation (EU) No 10/2011 and 21 CFR 177.1520; finished lids are also checked for dimensional stability under repeated dishwasher cycles, although no harmonised EU dishwasher-specific plastics standard applies to storage lids. Injection moulding of these parts is performed with melt temperatures of 220–245°C and mould temperatures of 15–30°C; the tool is often a single- or multi-cavity cold-runner mould with edge gating to maintain a uniform melt front, and hold pressure is limited to 40–60% of peak injection pressure to minimise warpage. Terminal finished products include rectangular and round dry-food container lids, modular food-storage set lids, and snap-on lids for refrigerator storage boxes.
Edible oil and sauce closures form a separate downstream application because the sealing surface must remain dimensionally stable after contact with lipid-containing products and must not exhibit stress cracking during prolonged low-torque sealing. The resin is processed at 100% HE6081 or with 2.0 wt% colour masterbatch and 0.05–0.10 wt% erucamide or oleamide slip masterbatch to stabilise application and removal torque; incompatible external lubricants from non-polyolefin carriers are excluded because they can migrate into the oil contact layer and alter sensory profile. Compliance is verified under Regulation (EU) No 10/2011, 21 CFR 177.1520, and EC 2023/2006; specific migration of additives is tested in fatty-food simulant D2 according to 10/2011 Annex III. Production equipment typically includes injection moulding machines with hot-runner valve gates to minimise gate vestige on the sealing lip, with melt temperature at 220–235°C, mould temperature at 8–15°C, and a packing profile that holds the sealing ring dimension within tight tolerances; used closure liners, if present, are inserted after cooling rather than during moulding. Copper phthalocyanine masterbatches are acceptable in standard colours, but metallic copper particles are excluded because they can create oxidative degradation points under prolonged oil contact. Terminal products are edible oil bottle caps, sauce and dispensing closures, and condiment flip-top caps for flexible polyethylene terephthalate or glass necks.
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Borealis HDPE HE6081 is a high-density polyethylene product designation supplied by the manufacturer for extrusion blow moulding of small and intermediate monolayer containers. The resin is supplied as pelletised medium-molecular-weight material with a nominal melt mass-flow rate of 0.8 g/10 min determined at 190 °C under 2.16 kg in accordance with ISO 1133-1, and a nominal density of 958 kg/m³ measured under ISO 1183-1. These values place HE6081 between low-melt-flow HDPE grades used for large containers and injection moulding HDPE grades used for caps and closures. The balance of melt strength and flow produces a parison that resists sag during continuous shuttle blow moulding while retaining enough shear thinning to fill calibrated neck and tail flash areas. Applications with publicly documented use include blow moulded bottles for household chemicals, personal care emulsions, and oral solid pharmaceutical packaging in which environmental stress crack resistance is a release criterion.
| Property | Test method | Typical value |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1 | 0.8 g/10 min |
| Density | ISO 1183-1 | 958 kg/m³ |
| Tensile modulus | ISO 527-2 | 1300 MPa |
| Tensile yield stress | ISO 527-2 | 30 MPa |
| Elongation at yield | ISO 527-2 | 9 % |
| Charpy notched impact strength, 23 °C | ISO 179-1/1eA | 6 kJ/m² |
| Environmental stress crack resistance | ASTM D1693, condition B, 10% Igepal CO-630, 50 °C | >100 h |
| Shore D hardness | ISO 868 | 63 |
The tabulated values are typical lot-average values from publicly available manufacturer documentation. They are not release specifications and should not be used as batch acceptance limits. Lot-specific certificates of analysis should be reviewed for density, melt flow rate, and contaminant criteria before pharmaceutical or food-contact qualification.
HE6081 occupies a narrow rheological band in the HDPE family. A lower-MFR blow moulding grade, typically 0.3 g/10 min, develops higher zero-shear viscosity and longer parison hang time, but it demands higher screw torque, generates more frictional heat in grooved-feed bushings, and extends cooling time because thicker wall sections retain heat. A higher-MFR injection moulding grade, typically 8.0 g/10 min, flows further in a closed mould but lacks sufficient melt strength to support a parison beyond a short drop length; it also exhibits lower environmental stress crack resistance because the higher melt index corresponds to a lower molecular weight and reduced tie molecule density. HE6081 at 0.8 g/10 min therefore provides a midpoint for bottles in the 100 mL to 1 L range where parison stability and cycle time must be optimised simultaneously.
At equivalent melt temperature, HE6081 exhibits higher parison stability than an injection moulding HDPE with 8.0 g/10 min because its higher molecular weight increases extensional viscosity. In continuous extrusion, the parison is a free-standing annular melt column; sag is governed by extensional flow under gravity. The higher zero-shear viscosity of HE6081 delays sag under the same parison drop time. The injection moulding grade cannot support parison lengths above a few centimetres without draw-down, which limits its use to injection-blow moulding processes where the preform is mechanically supported.
On shuttle blow moulding lines equipped with grooved-feed extruders of 40 mm to 60 mm screw diameter and 24:1 to 30:1 L/D, HE6081 is typically processed with a barrel temperature profile of 170 °C, 180 °C, 190 °C, 195 °C, and 200 °C from feed to metering zone. Die and head zones are maintained at 200 °C to 210 °C to prevent melt fracture while avoiding excessive parison sag. A barrier screw with a Maddock mixing section is preferred because the medium-molecular-weight melt can retain unmelted translucent particles when the extruder is run at screw speeds above 80 min⁻¹. Die swell for HDPE of this density and melt flow rate commonly falls between 30% and 50%, depending on die gap and shear rate; tooling must be sized accordingly. Blow air pressure between 0.6 MPa and 1.0 MPa is applied after mould close, and mould temperature is held at 10 °C to 35 °C for cycle-time control. When surface gloss is a critical acceptance property, the mould temperature may be raised to 50 °C, but at the cost of longer cooling time and increased cycle.
Pre-drying is generally not required for HE6081 if the pellets have been stored in closed original packaging. If surface condensation is present after outdoor storage or intermittent use, a hopper dryer set at 70 °C to 80 °C for 2 h to 4 h removes surface moisture. Extended drying above 90 °C should be avoided because pellet sticking and oxidation can occur in the feed throat.
The selection of HE6081 for aggressive household and healthcare concentrates rests on environmental stress crack resistance. Slow crack growth in HDPE bottles initiates at surface defects or moulded-in stress concentrations and propagates through interlamellar amorphous regions with low tie molecule density. Published product documentation lists ESCR above 100 h when tested under ASTM D1693, condition B, using 10% Igepal CO-630 at 50 °C. The test result is geometry-dependent and should not be extrapolated directly to bottle shelf life, but it discriminates HE6081 from injection moulding HDPE grades that fail at shorter times under the same test. Grades with lower MFR and higher comonomer content can exceed this ESCR value, at the cost of lower stiffness and longer cycle time.
In pharmaceutical packaging lines, the resin is evaluated for organoleptic neutrality, extractable content, and migration against pharmacopoeia and food-contact standards. Compliance statements supplied with the commercial grade are based on suitability under conditions specified in FDA 21 CFR §177.1520 for olefin polymers, European Commission Regulation (EU) No 10/2011 as amended for plastic materials intended to contact food, and USP <661.1> for plastic packaging systems when the packaging is within the scope of the monograph. The resin should not be used with strong oxidizing acids, halogenated solvents, or high-aromatic hydrocarbon contents beyond those permitted by the compliance certificate, because solvent uptake reduces molecular weight and accelerates environmental stress cracking.
Steam autoclave cycles above 110 °C are not recommended because the bottle wall distorts before the sterilization cycle is complete. Ethylene oxide and gamma irradiation may be used within dose ranges established by package qualification, but oxidative degradation during gamma irradiation above 25 kGy may increase yellowness and reduce impact strength.
HE6081 in monolayer form has a high oxygen permeation rate typical of high-density polyethylene, generally reported in the range of 1500 cm³·mm/m²·day·atm to 2500 cm³·mm/m²·day·atm at 23 °C and 0% relative humidity when normalized to film thickness. Published data for the specific oxygen permeability of HE6081 monolayer bottles is limited; standard HDPE film permeability should be validated by the package manufacturer. For oxygen-sensitive pharmaceutical or food formulations, the resin is coextruded with EVOH or polyamide barrier layers in three-layer or five-layer bottle structures. HE6081 performs as the skin and product-contact layers because it provides melt strength, seal compatibility, and product-contact compliance. Maleic anhydride-grafted polyethylene tie layers are required between HDPE and EVOH to prevent delamination during drop impact. The processing window of the coextrusion line is narrowed by the upper temperature limit of EVOH; the die temperature is normally held at 200 °C to 210 °C to match HDPE and EVOH viscosities. Viscosity mismatch is controlled by selecting EVOH grades with an MFR close to the 0.8 g/10 min to 1.6 g/10 min range at the same test conditions.
Flash and tail regrind from HE6081 can be reintroduced into the blow moulding process at levels up to 30% by weight with virgin resin when the regrind is free of dust, paper fibres, and degraded yellow particles. The use of regrind above this level is not recommended for pharmaceutical packaging because lot-to-lot variability in thermal history can alter melt flow rate and shift parison length. Reprocessing reduces notched impact strength and increases the risk of pinhole formation in the pinch-off weld. Pinch-off weld integrity is evaluated by drop impact testing after conditioning at 4 °C and by visual inspection for delamination at the weld line.
On production floors, parison sag, melt fracture, and blow pin fouling are the most frequent deviations when HE6081 is processed outside its thermal window. Sag increases when the melt temperature exceeds 210 °C or when the parison drop time is extended beyond 3 s to 4 s; melt fracture appears as surface roughness at die shear rates above approximately 1000 s⁻¹. Blow pin fouling may arise from degraded resin retained in dead spots of the head or from excessive mould release. Purging with a commercial HDPE purge compound at 180 °C to 200 °C restores clean metal surfaces, and the use of a lower-viscosity purge grade is sometimes required before colour changes. Unmelted particle defects in the bottle wall are reduced by increasing the metering zone temperature to 200 °C and by replacing a standard compression screw with a barrier screw.
Compared with lower-density HDPE grades at 0.953 g/cm³, HE6081 at 0.958 g/cm³ provides approximately 5% to 10% higher tensile modulus, which translates into higher top load strength for stackability. The increase in density is achieved by reducing comonomer content, which raises crystallinity, stiffens the amorphous phase, and reduces permeability slightly. However, higher crystallinity increases notch sensitivity and can lower ESCR. The product is therefore formulated to maintain acceptable slow crack growth resistance in the 0.8 g/10 min melt flow range.
Switching from a broad-MWD HDPE to HE6081 on an existing bottle line usually requires a reduction in die gap of 10% to 20% and an increase in parison programming gain to maintain wall thickness distribution. The narrower MWD lowers die swell and reduces swell-induced thickness at the pinch-off. The parison programmer should be recalibrated with a parison length set-point that accounts for the reduced sag of the 0.8 g/10 min melt. Extruder back pressure may decrease by 5 bar to 10 bar at constant screw speed when changing from a lower-MFR grade.
