| HS Code | 694552 |
| Density | 0.963 g/cm³ |
| Meltflowrate | 0.3 g/10 min (190°C/2.16 kg) |
| Tensilestrengthatyield | 30 MPa |
| Elongationatbreak | >600% |
| Flexuralmodulus | 1400 MPa |
| Charpynotchedimpactstrength | 10 kJ/m² (23°C) |
| Vicatsofteningtemperature | 125°C |
| Shoredhardness | 65 |
| Thermalconductivity | 0.4 W/m·K |
| Waterabsorption | <0.01% |
| Meltingtemperature | 130-135°C |
| Crystallinity | 70-80% |
| Oxidationinductiontime | >20 min (200°C) |
| Brittlenesstemperature | < -70°C |
As an accredited Borealis HDPE HE2630 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE HE2630 is packaged in 25 kg moisture-resistant polyethylene bags, suitable for safe storage and transport. |
| Container Loading (20′ FCL) | Borealis HDPE HE2630 high-density polyethylene resin, 25 kg bags, palletized and stretch-wrapped; 20′ FCL loading, approx. 20 MT net, non-hazardous. |
| Shipping | Borealis HDPE HE2630 is a non-hazardous polyethylene resin. It is shipped as pellets in 25 kg PE bags, octabins, or bulk containers. Transport in clean, dry vehicles or containers at ambient temperature. Protect from moisture, sunlight, heat, and contamination. No special dangerous goods classification; follow standard handling and stacking instructions. |
| Storage | Store Borealis HDPE HE2630 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original bags or containers closed, palletized, and protected from moisture, dust, and contamination. Avoid prolonged high temperatures and open flames. Store separately from incompatible materials. Maintain good housekeeping and follow the supplier’s SDS and local regulations. |
| Shelf Life | Borealis HDPE HE2630 has a 2-year shelf life when stored dry, in original packaging, under cool conditions and protected from direct sunlight. |
Accumulator-head blow moulding of 10–30 L UN jerricans for dangerous liquid fillings uses HE2630 at shot weights between 700 g and 1,200 g; the process conflict centres on the use of cleaned post-industrial regrind, because each additional heat history narrows the notched impact window at low temperature without changing melt mass-flow rate under ISO 1133-1:2022 in a proportional manner. On a 30:1 L/D extruder with a 2.5–5 kg accumulator head, melt temperature is held at 200–215 °C; raising the melt above 220 °C increases the low-molecular-weight tail and produces visible parison sag variation, especially when regrind content exceeds 20 wt%. The addition level of sorted regrind is therefore limited to 20–25 wt% for 3H1 packaging, with the regrind fraction screened through a 200 μm mesh pack before blending and dried at 70–80 °C for 1–2 h if stored above 60% RH. Higher fractions reduce weld-line integrity at the handle pinch-off and fail the -18 °C drop test per ADR 6.1.5.3 for packing group II liquids at 1.2 m drop height. Parison programming uses 14–18 points to compensate for 15–25% die swell, and the mould is chilled to 10–15 °C to achieve cycle times of 60–90 s on a double-station jerrican line. Stacking resistance is validated per ISO 2234, and finished 20 L containers are subjected to hydraulic pressure according to ISO 16104 and leakproofness tests under the applicable ADR 6.1.5.4 procedure. The terminal articles are filled with solvents, agrochemical diluents, and corrosive liquids where the HDPE wall must survive contact at 40 °C for 28 days without environmental stress cracking; batch-to-batch variance in regrind gel content remains the primary rejection cause on production scale.
For barrier containers intended for organophosphate and pyrethroid formulations, HE2630 forms both structural layers in a five-layer EVOH coextrusion rather than being processed as a monolayer package. In a typical 5-layer blow moulding die head, the weight distribution is set to 22–28 wt% inner HDPE, 2–3 wt% adhesive, 4–6 wt% EVOH barrier containing 32–38 mol% ethylene, 2–3 wt% second adhesive, and the balance outer HDPE; the outer layer may incorporate 10–20 wt% clean regrind if the crop comes from the same container line and is sieved below 200 μm. Melt temperature at the HDPE extruder is held at 210–225 °C, while the EVOH extruder is kept at 200–215 °C because residence times above 12 min at 230 °C initiate gel formation and layer instability. The die gap is set at 1.5–2.2 mm and parison programming uses 12–16 points to maintain barrier-layer continuity in the pinch-off and shoulder regions; blow pressure is 0.8–1.2 MPa with mould temperatures of 10–15 °C. Finished articles from 200 mL to 5 L are used for plant protection products and veterinary ectoparasiticide concentrates; oxygen transmission is measured per ASTM D3985 at 23 °C/0% RH, while water vapour transmission is measured per ASTM F1249. Published permeation coefficients for this specific configuration with aromatic solvent mimics are limited; sorption and dimensional change are therefore tested per ASTM D543 on coupons cut from produced bottles before filling-line qualification.| Parameter | Monolayer household cleaner bottle | UN-certified jerrycan | Five-layer agrochemical container |
|---|---|---|---|
| Melt temperature (°C) | 195–205 | 200–215 | 210–225 |
| Die gap (mm) | 1.3–1.8 | 1.5–2.2 | 1.5–2.2 |
| Parison programming points | 10–14 | 14–18 | 12–16 |
| Regrind upper limit (wt%) | 20–30 | 20–25 | 10–20 outer layer |
| Mould temperature (°C) | 12–18 | 10–15 | 10–15 |
| Critical standard | ASTM D1693-21 | ADR 6.1.5.3 | ASTM D3985 |
Continuous rotary wheel blow moulding of 500 mL to 2 L pasteurized milk bottles uses HE2630 at melt temperatures of 190–200 °C, with moulds chilled to 10–15 °C to achieve 7–10 s cycle times on 14 to 18 station wheels. The polymer is dry-blended with 1–2 wt% white concentrate; no drying is required for sealed virgin pellets, but storage in hoppers at relative humidity above 60% can produce surface moisture that appears as pinholes at the pinch-off and is controlled by maintaining hopper temperature 2–3 °C above ambient. Top load stability is governed by wall thickness distribution in the hand-grip and base corners; for a 1 L bottle at 500 μm average sidewall thickness, compression testing per ASTM D2659 is applied to unfilled containers, with the specification set relative to pallet stacking at 3 high. Compliance with food-contact requirements is anchored to EU Regulation (EC) No 10/2011 with overall migration limited to 10 mg/dm², and to FDA 21 CFR 177.1520(c), item 3.1a for polyolefins, provided the precolour concentrates meet the same food-contact additive requirements. The terminal articles are filled under clean-fill conditions rather than aseptic ultrapasteurization lines because monolayer HDPE does not provide sufficient oxygen barrier for extended shelf-life; refrigerated distribution is limited to 7–14 days, and longer shelf-life requires a multilayer structure or light-shielded formulation. Published oxygen transmission data for this specific grade and bottle geometry is limited, so shelf-life trials are conducted at 4 °C storage with periodic sensory scoring rather than relying solely on permeation modelling.
On high-gloss personal-care bottle lines, the limiting defect is not parison sag but residual stress whitening at the pinch-off weld zone, which becomes visible when the mould is polished to an SPI/SPE finish of A-2 or higher and the container is tinted with 2–4 wt% pearlescent or carbon-black masterbatch. HE2630 is processed at melt temperature 195–205 °C and blow pressure 0.8–1.1 MPa; mould temperature is deliberately raised to 20–25 °C to preserve gloss, but this reduces heat-transfer-driven cooling and requires an extended blow time of 10–14 s on a shuttle blow moulder. Preblow delay is set at 0.2–0.8 s and preblow pressure at 0.4–0.6 MPa; premature inflation of the parison causes frosty patches on the outer surface, while delayed inflation produces a thickened pinch-off that whitens during demoulding. The finished articles from 100 mL to 500 mL are used for hair conditioner, facial toner, and cosmetic oil packages; each container is drop tested per ASTM D2463 at -10 °C to quantify brittle failure, and the pinch-off flash is subjected to a 90° bend test to detect microcracks. Migration constraints follow EU Regulation (EC) No 1223/2009 only for the cosmetic formulation, but the packaging must not release heavy metals or colorants under the intended storage condition; leachable screening is conducted using 95% ethanol and isopropyl myristate as food simulants per EU 10/2011 when the marketer places the same package on the boundary of food and personal-care use.Injection blow moulding of 50–250 mL oral-dose bottles from HE2630 is performed on 12–24 cavity machines with a first-stage injection melt temperature of 200–215 °C, injection pressure of 80–110 MPa, and second-stage blow mould temperature of 8–12 °C; the preform design uses a 3:1 length-to-wall-thickness ratio at the neck to avoid core shift and wall thinning under high fill speed. The resin is specified without slip agents of plant origin and without amine-based processing aids, because pharmacopoeial extractables testing under USP <661> and Ph.Eur. 3.1.3 includes UV absorbance, acid–base consumption, and residue after evaporation that are sensitive to low-molecular-weight additives. For dry oral solids such as chewable tablets and powder sachets, the bottle body thickness is maintained above 0.8 mm to provide moisture protection; desiccant-filled closures compensate for monolayer HDPE water vapour transmission, measured per ASTM F1249. Compliance is anchored to FDA 21 CFR 177.1520(c), item 3.1a and EU Regulation (EC) No 10/2011; the finished article is also evaluated under ICH Q3D for elemental impurities if the fill is an oral liquid. The terminal package is used for vitamins, antihistamine syrups, and reconstitutable oral suspensions, where the bottle must withstand 5–10 N closure torque without stress whitening in the neck finish and remain dimensionally stable through 50 °C accelerated stability storage for 6 months.
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Borealis HDPE HE2630, supplied under the BorPure HE2630 grade designation, is a bimodal high-density polyethylene developed for injection-moulded caps, closures and thin-wall containers. The resin is characterised by a melt flow rate of 6.3 g/10 min at 190 °C under a 2.16 kg load in accordance with ISO 1133-1:2022 and a density of 0.963 g/cm³ determined by ISO 1183-1:2019. The Borstar bimodal polymerisation route creates a higher-molecular-weight fraction that contributes to notched impact and environmental stress-crack resistance and a lower-molecular-weight fraction that governs melt flow; this combination is not readily obtained in conventional unimodal Ziegler-Natta HDPE at equivalent density and melt flow rate. Pre-drying is not required while the original packaging remains intact, but surface condensation formed on cold pellets during handling at relative humidity above 60 % should be removed by pre-drying at 80 °C for 2 h to prevent splay and surface defects in thin-wall parts. Typical application fields include beverage closures, mineral water caps, and food-supplement closures in which sensory neutrality and dimensional precision are specified on the finished article.
| Property | Test standard | Typical value |
|---|---|---|
| Melt flow rate | ISO 1133-1:2022 | 6.3 g/10 min at 190 °C, 2.16 kg |
| Density | ISO 1183-1:2019 | 0.963 g/cm³ |
| Tensile modulus | ISO 527-2:2012 | 1400 MPa |
| Tensile stress at yield | ISO 527-2:2012 | 30 MPa |
| Tensile strain at yield | ISO 527-2:2012 | 8 % |
| Charpy notched impact strength at 23 °C | ISO 179-1:2010 | 6.0 kJ/m² |
| Vicat softening temperature A50 | ISO 306:2022 | 128 °C |
| Shore D hardness | ISO 868:2003 | 68 |
The values reported in the table are typical lot values, not specification limits; the certificate of analysis issued with each lot provides the actual control data. Specimen preparation and conditioning follow ISO 1872-2 and ISO 291 at 23 °C and 50 % relative humidity unless otherwise noted. The melt flow rate is a low-shear indication of average molecular weight; it does not capture the high-shear viscosity response in thin-wall injection moulding. Density influences part stiffness and barrier contribution, but increasing density in HDPE normally reduces notched impact and environmental stress-crack resistance. The tensile modulus of 1400 MPa and notched Charpy impact of 6.0 kJ/m² at 23 °C therefore represent the stiffness-impact balance for thin-wall closures. The Vicat softening temperature of 128 °C is a short-term thermal softening datum and should not be interpreted as a continuous-use temperature. Published environmental stress-crack resistance data under ASTM D1693 for this specific grade are limited; stress-crack performance is more reliably compared on the finished closure under the packaged-product contact conditions.
The bimodal molecular weight distribution also affects crystallisation kinetics and shrinkage. The higher-density lamellar structure supports closure top-load performance without requiring proportionally thicker walls. In closure applications, top-load strength is measured on the finished closure by force-deflection testing; the tensile modulus datum is an input to buckling estimation under axial load. Melt flow rate, density, and tensile yield stress are therefore used together in incoming material inspection because they detect gross lot drift before processing begins.
On high-cavitation hot-runner tools, the usable melt temperature band for BorPure HE2630 is 210 °C to 250 °C. The lower boundary is imposed by melt viscosity and cavity pressure demand; in tools with more than 64 cavities, moulders report a sharp rise in injection pressure below 210 °C, with outer cavities susceptible to short shots when manifold balance is imperfect. The upper boundary is governed by thermo-oxidative chain scission; melt residence above 250 °C raises melt flow rate and generates low-molecular-weight oxidation products that can compromise organoleptic performance. A maximum residence time of 10 min at the upper melt temperature is applied on production lines to limit molecular weight drift. Barrel capacity is matched to shot weight so that material does not remain stagnating in the compression zone.
For wall thicknesses of 0.4–1.2 mm, fill speed is set to complete cavity filling before freeze-off; production experience indicates that fill times of 0.3–0.8 s are typical for high-cavitation cap tooling. Mould surface temperature is held between 10 °C and 30 °C. Below 10 °C, condensation in humid production buildings can produce surface blush at the gate and weak knit lines. Above 30 °C, cycle time increases without proportional improvement in shrinkage isotropy. Gate freeze time controls sink marks and closure ovality; early gate freeze produces sink marks, whereas late gate freeze increases cycle time. Packing pressure is then reduced after gate freeze to minimise cycle time.
The melt flow rate is a single-point low-shear measurement; injection moulding is dominated by shear rates of 10³–10⁴ s⁻¹ in thin-wall gates. Under high shear, viscosity decreases, but the degree of shear thinning depends on the molecular weight distribution. The bimodal distribution in HE2630 provides stronger shear thinning than a narrow unimodal grade of the same melt flow rate, which reduces pressure loss in hot-runner channels. No single-point melt flow rate value should be used to calculate injection pressure; moulders use capillary rheometry data or commercial flow simulation software with pressure-volume-temperature and viscosity coefficients.
Screw recovery time can become the throughput bottleneck when running HE2630 in high-cavitation tooling. A medium-shear screw of 20:1 L/D with a non-return valve and a stable melt cushion is used to maintain shot-weight uniformity. Electric toggle machines with closed-loop injection pressure control typically hold cavity-to-cavity weight variation below 1 % when the hot-runner manifold is balanced; hydraulic machines with slower pressure response may require wider tolerances. Hot-runner manifold temperature is maintained 10–20 K above the nozzle temperature to offset pressure loss, but localised manifold superheat above 280 °C can cause molecular weight degradation and discolouration at valve-gate dead spots.
Dimensional control in thin-walled closures is influenced by post-moulding shrinkage and gate location. HDPE exhibits anisotropic shrinkage after ejection; closure ovality is best controlled through uniform cooling and adequate packing rather than by increasing mould temperature. Process-capability studies on high-cavitation tools usually monitor closure weight, sealing surface flatness, and internal diameter as critical quality characteristics. Batch-to-batch variation in melt flow rate is controlled through the supplier’s production specification, and converters verify incoming lots by melt flow rate and density before production campaigns.
Tethered closure hinges are subjected to repeated flexural loading and must carry the hinge through repeated open-close cycles without stress-whitening or crack propagation. The notched Charpy impact of 6.0 kJ/m² at 23 °C provides a comparative impact ranking; it does not directly predict hinge fatigue life. Published data for hinge-specific fatigue life under repeated flexure is limited for HE2630; closure manufacturers validate the final geometry using their own flexural fixture and cycle protocols. The tensile yield stress of 30 MPa measured by ISO 527-2:2012 is used in finite-element stress analysis for hinge design. Hinge thickness, radius, and molecular orientation are critical; if the flow front meets at the hinge, the resulting weld line can reduce flexural fatigue life. Valve-gated tooling is therefore preferred when the gate position must be moved away from the hinge.
The organoleptic character of the grade is relevant for mineral water and juice closures. Off-taste transfer is controlled by the base resin additive package and by limiting melt temperature and residence time; processing-induced degradation products are often the source of organoleptic failure. Polypropylene closure grades may provide higher flexural modulus and higher heat deflection temperature, but HDPE is selected when low-temperature notched impact and environmental stress-crack resistance against fats, oils, and packaging liquids are the controlling constraints. Continuous exposure above 80 °C is outside the normal design envelope for this HDPE grade; application-specific ageing studies are required.
Environmental stress-crack resistance is relevant for closures exposed to aggressive packaged media. HDPE is generally resistant to aqueous systems, but stress cracking can occur under residual stress in the presence of surfactants, oils, or certain essential oils. The base resin should be evaluated on the finished closure under representative contact conditions; a material that passes standard ESCR tests on a plaque may still crack at a sharp hinge or gate vestige. The enclosure design should avoid sharp transitions and excessive packing-induced residual stresses.
For food-contact and pharmaceutical closure applications, conformance is evaluated against European Commission Regulation (EU) No 10/2011 as amended and FDA 21 CFR 177.1520. The FDA citation covers olefin polymers for food-contact use, subject to conditions of use specified in 21 CFR 176.170(c); the base polymer must be combined with compliant additives and pigments. Under EU Regulation (EU) No 10/2011, overall migration is limited to 10 mg/dm² for food-contact plastics, and specific migration limits for authorised substances in Annex II apply. Base resin compliance does not automatically confer compliance on the finished closure; converters must repeat migration testing after adding masterbatch colourants, slip agents, or recycled material. Where recycled content is introduced, additional requirements under EU Regulation (EU) 2022/1616 apply to ensure that the decontamination process is validated and the final closure continues to meet the overall migration limit.
Organoleptic neutrality is partly determined by the additive package, and the processing lubricants used in the base resin are selected to limit taste and odour transfer. If a converter adds external lubricants, antistatic agents, or colourants, the final closure must be re-evaluated for sensory and migration compliance. The base resin lot certificate does not cover additive changes introduced during compounding or masterbatch dilution.
| Framework | Scope | Key value or condition |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymer base resin | Conditions of use per 21 CFR 176.170(c) |
| Regulation (EU) No 10/2011 | Overall migration and specific migration | OML 10 mg/dm²; Annex II SMLs |
| REACH Regulation (EC) No 1907/2006 | SVHC Candidate List | Supplier confirmation for article supply |
Compared with a unimodal HDPE at equivalent melt flow rate of 6.3 g/10 min and density of 0.963 g/cm³, the bimodal resin shifts the stiffness-impact trade-off. In a unimodal grade, increasing density to attain tensile modulus near 1400 MPa is usually accompanied by reduced notched Charpy impact and lower environmental stress-crack resistance because tie-chain concentration and short-chain branching are more uniform. The bimodal chain architecture in HE2630 permits a higher concentration of tie chains in the high-molecular-weight fraction without raising low-shear viscosity to the level of a blow-moulding grade; this allows thin-wall injection moulding while retaining impact properties that are more often associated with lower-density HDPE. The high-molecular-weight mode increases entanglement density and tie-chain concentration between lamellae, while the low-molecular-weight mode reduces high-shear viscosity and improves filling.
The molecular weight distribution of a bimodal grade is not simply broadened; it contains two distinguishable modes whose chain lengths are independently controlled. The short-chain branching distribution is also different from a unimodal grade. These differences do not always appear in a standard datasheet, and they explain why two HDPE grades with identical density and melt flow rate can behave differently in a hot-runner tool or in a hinge fatigue test.
Against extrusion blow-moulding HDPE, HE2630 has a substantially higher melt flow rate. Blow-moulding grades frequently operate at melt flow rates below 1 g/10 min to maintain parison melt strength; HE2630 is not intended for continuous extrusion blow moulding of bottles because parison sag resistance is insufficient. The grade is also not suitable for pressure pipe applications where long-term hydrostatic strength under ISO 9080 is required; those applications use dedicated PE100 materials with validated creep rupture behaviour. Compared with impact copolymer polypropylene, HE2630 has lower flexural modulus and lower heat deflection temperature, but is selected where environmental stress-crack resistance, low-temperature notched impact, or organoleptic requirements dominate the closure specification.
