| HS Code | 609327 |
| Polymertype | High Density Polyethylene |
| Density | 0.954-0.956 g/cm³ |
| Meltflowrate | 5.5-8.0 g/10 min (190°C/2.16 kg) |
| Tensilestrengthatyield | 26-31 MPa |
| Tensileelongationatbreak | 600-800% |
| Tensilemodulus | 1200-1500 MPa |
| Flexuralmodulus | 1000-1400 MPa |
| Charpynotchedimpactstrength23c | 5-8 kJ/m² |
| Charpynotchedimpactstrengthminus30c | 2-4 kJ/m² |
| Vicatsofteningtemperature | 125-128°C |
| Meltingtemperature | 130-135°C |
| Shoredhardness | 60-65 |
| Waterabsorption | <0.01% |
| Thermalconductivity | 0.40-0.45 W/m·K |
| Electricalresistivity | >10^15 ohm·cm |
| Dielectricconstant | 2.3 |
| Crystallinity | 70-80% |
| Molecularweightdistribution | Bimodal |
| Environmentalstresscrackingresistance | Good |
| Foodcontactcompliance | Yes |
As an accredited Borouge HDPE BORPURE factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borouge HDPE BORPURE is supplied in 25 kg polyethylene bags, typically stacked on shrink-wrapped pallets for transport and storage. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): Borouge HDPE BORPURE packed in 25 kg bags, palletized and loaded into a 20-foot container. |
| Shipping | Borouge HDPE BORPURE is shipped as a non-hazardous HDPE polymer in pellet form. Standard packaging includes 25 kg bags, 500–1000 kg jumbo bags, or bulk trucks/containers. It has no UN number or dangerous goods classification. Store dry, away from heat, ignition sources, and UV. |
| Storage | Store Borouge HDPE BORPURE in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, flames, and strong oxidizers. Keep original bags or containers closed, clean, and palletized off the floor. Avoid moisture, contamination, and excessive stacking. Maintain stable temperatures and use first-in, first-out stock rotation. Protect from UV degradation and odorous contaminants. Follow the manufacturer’s SDS and local regulations. |
| Shelf Life | Shelf life is typically 24 months from production when stored sealed in original packaging, cool, dry, and away from direct sunlight. |
Carbonated soft drink closure production places a singular demand on high-density polyethylene: the polymer must retain vent-slit geometry under internal CO2 pressure while resisting environmental stress cracking in the presence of carbonic acid, diluted syrup residues, and neck-finish thread lubricants. In closure-grade Borouge HDPE BORPURE, the bimodal molecular weight distribution produced by the Borstar loop-slurry process is matched to the short flow path from hot-runner valve gate to thread core; this controls warpage in closures intended for the PCO 1881 neck finish and similar PET bottle finishes. The regulatory set for food-contact olefin polymers includes EU Regulation (EU) No 10/2011 as amended by Regulation (EU) 2020/1245, FDA 21 CFR 177.1520, and converter-specific CSD closure performance protocols where pressure retention, removal torque, and slit venting are measured after carbonation at 4.0 ± 0.5 vol CO₂. In unpigmented CSD cap formulations, Borouge HDPE BORPURE is typically loaded at 98.5–99.0 wt%, with a polyethylene-based masterbatch at 0.5–1.0 wt% and an erucamide slip masterbatch at 0.05–0.2 wt%; addition above 0.2 wt% can reduce vent-slit friction to the point of premature vent closure during bottle drop. Injection moulding on Sacmi, Husky, or Netstal high-cavitation closure systems uses a melt-temperature window of 220–250°C and chilled mould surfaces held at 8–15°C; gate freeze-off must occur before crystallisation at the mould surface slows flow, otherwise microgates in 96- or 128-cavity tools shear-heal incompletely and the tamper-evident band tears along the slit path. Terminal product types include one-piece tamper-evident CSD closures for PET and glass bottle finishes, two-piece overcap-shell configurations, and colour-coded variants with embossed date coding.
| Application segment | Typical Borouge HDPE BORPURE loading | Principal standards |
|---|---|---|
| CSD closures | 98.5–99.0 wt% | EU No 10/2011; FDA 21 CFR 177.1520; ISBT CSD closure protocols |
| Still water closures | 99.0–100 wt% | EU No 10/2011; FDA 21 CFR 177.1520; EC 1935/2004 |
| Personal care flip-top closures | 95.0–98.0 wt% | EU No 1223/2009; FDA 21 CFR 177.1520; REACH Annex XVII |
| Edible oil and condiment closures | 99.0–100 wt% | EU No 10/2011; FDA 21 CFR 177.1520; ASTM D1693-15 |
| Pharmaceutical closures | 100 wt% | USP <661.1>; Ph. Eur. 3.1.3; FDA 21 CFR 177.1520 |
| Dairy and UHT closures | 100 wt% | EU No 10/2011; FDA 21 CFR 177.1520 |
Gate freeze-off in high-cavitation still water closure tools is governed less by resin viscosity than by the thermal gradient between the molten core and the chilled thread plate. Borouge HDPE BORPURE grades intended for still water closures are processed on 128-cavity or 192-cavity hot-runner systems with chilled mould surfaces maintained at 6–12°C and melt temperatures between 210°C and 235°C. The governing exposure framework includes EU Regulation (EU) No 10/2011, FDA 21 CFR 177.1520, and EC 1935/2004; no carbonation-pressure retention test applies, but compression seal force and linerless plug geometry are measured on the filling line. The typical formulation is 99.0–100 wt% virgin Borouge HDPE BORPURE; where colour is required, a polyethylene-based masterbatch is added at 0.5–1.0 wt%. Production uses precision valve gating, post-mould cooling plates, and automated vision inspection for thread ovality. Finished product types include 30/25 mm and 29/25 mm linerless still water closures, sports-cap bases with push-pull valves, and closures for aseptic cold-filled beverages.
In personal care flip-top closures, the hinge region is the controlling design feature because HDPE undergoes repeated flexing with a deformation amplitude approaching 180° during consumer opening, and stress whitening at the hinge root becomes an immediate visual rejection criterion. Borouge HDPE BORPURE is compounded at 95.0–98.0 wt%, with a polyethylene-based colour masterbatch at 1.0–4.0 wt% and, where required for cap-on-cap assembly, an antistatic masterbatch at 0.1–0.5 wt%; the antistatic loading is kept below the level that would introduce surface tack. Compliance references include EU Regulation (EC) No 1223/2009 for cosmetic product compatibility, FDA 21 CFR 177.1520 as a purity benchmark for olefin polymers, and REACH Annex XVII for restricted substances. Injection moulding is performed with unscrewing or collapsible cores for internal thread formation, side-gated or sub-gated entries placed away from the hinge root, and extended cooling time to avoid hinge warpage; tools are typically run on toggle-clamp machines with clamp force scaled to the projected area of multi-cavity layouts. Terminal product types include flip-top caps for shampoo and lotion bottles, disc-top closures for viscous cosmetic products, and colour-matched overfits for glass cosmetic jars.
Edible oil closure moulding shifts the acceptance criterion from short-term removal torque to long-term environmental stress crack resistance, because migrated unsaturated fatty acids act as stress-crack accelerants in HDPE when the polymer is under residual hoop stress from thread engagement. Under EU Regulation (EU) No 10/2011, fatty food contact is assessed with food simulant D2 or the authorised substitute 95% ethanol, which produces more aggressive extraction than aqueous simulants; FDA 21 CFR 177.1520 covers the olefin polymer itself. Borouge HDPE BORPURE is loaded at 99.0–100 wt% virgin resin; colour masterbatch is limited to 0.5–1.0 wt%, and closed-loop regrind is restricted to 0–15 wt% where national food-contact legislation permits reuse of uncontaminated sprues and runners. Production uses high-cavitation injection moulding with extended holding pressure to compensate for volumetric shrinkage, followed by cooling on temperature-controlled plates at 10–15°C. Quality control relies on ASTM D1693-15 for environmental stress crack resistance and ISO 1133-1:2022 for melt flow rate. Terminal product types include screw caps for edible oil bottles, linerless soy sauce and vinegar closures, and wide-mouth caps for condiment jars.
When pharmaceutical closure moulding shifts to USP <661.1> validation, the resin must demonstrate extractable and leachable behaviour within the plastic packaging monograph expectations without relying on post-mould washing. Borouge HDPE BORPURE is stored and conveyed under closed dry-air handling and processed in cleanroom injection moulding cells operating at ISO 14644-1 Class 8 or tighter; closed-loop material handling prevents particulate and external lubricant contamination. The formulation is 100 wt% virgin resin; no regrind, no colour masterbatch, and no external slip additive are used unless the packaging component dossier explicitly covers them. Compliance references include USP <661.1> and USP <661.2>, Ph. Eur. 3.1.3, FDA 21 CFR 177.1520, and extractable assessment aligned with USP <1663>. Process parameters are maintained at 210–240°C melt temperature and 10–15°C mould temperature; mould release is limited to volatile-free coatings because silicone oil on mould surfaces can become an extractable. Finished product types include child-resistant closures for solid oral dose bottles, HDPE vial caps with tamper-evident breakaway rings, and desiccant-sealed pharmaceutical closures.
Managing organoleptic carryover in dairy and UHT closure moulding means controlling both resin-derived oxidation by-products and process-related thermal degradation species that would cross the sensory threshold of milk, flavoured dairy drinks, or UHT-treated formulations. Borouge HDPE BORPURE is used at 100 wt% natural; no re-pigmented masterbatch or reclaimed material is introduced because dairy bottlers treat taint and odour uniformity as a lot-release parameter. The regulatory references include EU Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520; sensory conformity is evaluated under ISO 13302:2003, and the closure specification defines residual torque behaviour on the filling line capping head, because backing off after pasteurisation or UHT processing is a process failure rather than a material property failure. Injection moulding uses melt temperatures of 220–240°C and mould temperatures of 8–12°C; barrel residency is managed through shot-size discipline and purge protocols, and the absence of colour-change pigments simplifies internal surface smoothness. Terminal product types include HDPE closures for fresh milk bottles, UHT milk caps, flavoured dairy drink closures, and tamper-evident dairy closures with foil-seal support rims.
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Borouge HDPE BORPURE MB5567 is a Borstar-process bimodal high-density polyethylene supplied in pellet form for injection-moulded beverage closures. The resin combines a low-molecular-mass fraction, which lowers capillary viscosity and permits short cycle times at moderate melt temperature, with a high-molecular-mass fraction that carries the comonomer and increases tie-chain density. This architectural separation reduces the historical trade-off between flow length and environmental stress-cracking resistance encountered with unimodal HDPE. Representative datasheet values for MB5567 include a density of 0.956 g/cm³ (ISO 1183-1), a melt flow rate of 0.55 g/10 min at 190 °C/2.16 kg (ISO 1133-1), a tensile modulus of 1050 MPa (ISO 527-2/1B), a notched Charpy impact strength at 23 °C of 13 kJ/m² (ISO 179/1eA), and a Vicat softening temperature A50 of 127 °C (ISO 306). These values are typical manufacturer data and do not function as specification limits.
Borstar bimodal polymerisation uses two reactors in series: a slurry-loop reactor for the low-molecular-mass homopolymer fraction and a gas-phase reactor for the high-molecular-mass copolymer fraction. This sequencing places comonomer in the high-molecular-mass chains, where short-chain branching raises tie-chain concentration, rather than in the low-molecular-mass fraction, where it would depress melting temperature and stiffness without improving slow crack-growth resistance. The low-molecular-weight fraction is essentially an ethylene homopolymer, while the high-molecular-weight fraction contains a controlled level of alpha-olefin comonomer. Differential scanning calorimetry (ISO 11357-3:2018) typically places the main melting peak near 132 °C, with crystallinity in the range 65% to 75%. In unimodal HDPE, the molecular-weight and comonomer distributions are less segregated, so an increase in density for stiffness can simultaneously reduce ESCR because fewer tie molecules survive.
Carbonated soft-drink closures are subjected to internal pressure and top-load forces during capping and storage. The cap shell must retain circumferential stiffness at the thread root while the tamper-evident band absorbs axial force during first-opening; therefore density and melt flow are deliberately balanced. For BORPURE MB5567, the density of 0.956 g/cm³ provides sufficient crystalline fraction for stiffness, while the 0.55 g/10 min melt flow rate permits filling of narrow thread sections without excessive injection pressure. Tensile properties are tested according to ISO 527-2/1B, and impact behaviour according to ISO 179/1eA. The property profile is compared against unimodal HDPE grades with equivalent melt flow rate; the bimodal distribution in BORPURE shifts ESCR measured under ASTM D1693-15 condition A to longer failure times while maintaining similar spiral-flow length. Published data for a specific closure geometry should be confirmed on the production line because gate design and wall thickness alter the relationship between laboratory ESCR and cap cracking.
| Property | Standard | Typical value |
|---|---|---|
| Melt flow rate (190 °C/2.16 kg) | ISO 1133-1 | 0.55 g/10 min |
| Density (23 °C) | ISO 1183-1 | 0.956 g/cm³ |
| Tensile modulus | ISO 527-2/1B | 1050 MPa |
| Tensile yield stress | ISO 527-2/1B | 26 MPa |
| Elongation at yield | ISO 527-2/1B | 9% |
| Charpy notched impact strength (23 °C) | ISO 179/1eA | 13 kJ/m² |
| Vicat softening temperature A50 | ISO 306 | 127 °C |
| Shore D hardness | ISO 868 | 63 |
On 250-tonne injection moulding machines with general-purpose polyolefin screws of 20:1 to 25:1 L/D and compression ratio 2.0:1 to 3.0:1, BORPURE MB5567 is processed at barrel temperatures from 180 °C to 230 °C, with hot-runner and nozzle temperatures maintained in the same range. Mould temperatures between 10 °C and 30 °C are used to freeze closure dimensions and maintain short cycle time. Back pressure is set from 5 bar to 15 bar hydraulic to homogenise the melt without excessive shear heating. If pellet surface moisture exceeds 0.1% by ISO 15512, drying in a desiccant-bed dryer at 80 °C for 1 h is applied; routine closed-loop storage of undamaged bags does not require pre-drying. Mould shrinkage for this grade is in the range 1.5% to 2.5% according to ISO 294-4, requiring cavity compensation in cap outside diameter and thread flank geometry.
Barrel profiles are commonly set with the feed zone at 180 °C, compression zone at 220 °C, metering zone at 230 °C, and nozzle at 225 °C. Hot-runner manifold zones are also set to 225 °C to 230 °C, with tip temperatures adjusted downward for gates below 0.8 mm. The melt stream temperature measured by infrared pyrometer at the nozzle exit is maintained in the 210 °C to 230 °C band. Screw speed is normally limited to 100 rpm to 150 rpm for 50 mm to 80 mm screw diameters to prevent excessive shear heating. First-stage injection pressure is typically capped at 100 MPa to prevent flash in high-cavitation tools. Batch-to-batch variation in melt flow rate is controlled by the manufacturer, but converters monitor screw recovery time and cushion position to detect lot changes before dimensional faults appear. A reduction in melt viscosity due to an incoming lot at the upper MFR limit can shift switch-over point and cause sink marks on the cap top deck.
Weld lines generated in multi-gated cap designs are evaluated by sectioning the thread area. The weld-line zone must not exhibit surface delamination after torque testing. Torque-test fixtures are typically operated at 0.5 rev/min to 2 rev/min, measuring first-opening torque values in the range 0.5 N·m to 2.5 N·m depending on cap diameter and tamper-evident band design. These values are geometry-dependent and are not resin-specific; the resin contributes consistency rather than the absolute torque level.
Beverage closures require low taste and odour contribution. Unimodal HDPE grades with narrow molecular-weight distribution often require high melt temperature to fill thin-wall caps; thermal oxidation at elevated melt temperature generates aldehydes and ketones that migrate into packaged water or carbonated beverage. The bimodal molecular weight distribution in BORPURE MB5567 permits lower melt temperature and lower screw energy input. The high-molecular-mass fraction contributes shear thinning, while the low-molecular-mass fraction lowers viscosity at high injection shear rates. Volatile organic compounds are assessed by headspace gas chromatography with detection in the µg/kg range, and sensory odour is evaluated by EN 1622:2006 for threshold odour number. For closures moulded at 200 °C, total odour scores are typically below the manufacturer's release limit; however, migration kinetics depend on cap geometry, beverage type, filling temperature, and storage time, so final closure validation is required.
The difference from other Borouge HDPE grades is primarily in flow and impact balance. BORPURE MB5567 is formulated for still and sparkling water closures where cycle time and dimensional consistency dominate. Grades intended for aggressive carbonated soft-drink closures may use a lower melt flow rate and a higher comonomer content in the high-molecular-mass fraction to extend slow crack-growth resistance. In comparison with chromium-catalysed unimodal HDPE, Borstar-process BORPURE does not use chromocene-based catalysts, which reduces metallic residue concerns and simplifies compliance with food-contact regulations. Residual catalyst metal values are batch-specific and are documented on the supplier certificate of analysis.
Although the nominal processing band is 180 °C to 230 °C, moulders may encounter local melt temperatures above 230 °C in hot-runner systems, particularly at gate diameters below 0.8 mm and high shear rates. Prolonged residence time above 230 °C accelerates oxidative chain scission, reduces melt viscosity, broadens shot-weight variation, and raises the concentration of low-molecular-mass oxidation products. High-cavitation hot-runner tools with unbalanced flow paths can amplify residence-time distribution. Cavity-to-cavity weight variation is controlled by balancing manifold zones to ±5 °C and maintaining screw recovery time variation below ±0.3 s. If the machine is stopped for more than 15 min, residual melt in the barrel should be purged before automatically moulding closures, and the first 5 to 10 shots discarded to prevent off-spec closures with reduced impact strength.
For food-contact use, BORPURE MB5567 is positioned to meet the following declarations when processed without unauthorised additives. Compliance is established only against the final closure, because colourants, masterbatch carriers, and lubricants alter migration behaviour.
| Standard or regulation | Scope | Status as declared by supplier |
|---|---|---|
| U.S. FDA 21 CFR 177.1520 | Olefin polymers for food contact | Compliant for beverage closures under conditions of use applicable to the final article; conditions of use should be confirmed on the finished closure. |
| EU Regulation (EU) No 10/2011 | Plastic materials intended to come into contact with food | Overall migration limit 10 mg/dm² for food simulants; final closure testing required if masterbatch or additive loadings change. |
| REACH Regulation (EC) No 1907/2006 | Substances of very high concern | No SVHC above 0.1% w/w in resin as supplied. |
| RoHS Directive 2011/65/EU | Restriction of hazardous substances | Resin portion typically compliant; final assembly components must be assessed separately. |
Compared to standard unimodal HDPE blow-moulding grades, BORPURE MB5567 is not intended for extrusion blow-moulded bottles. Its formulation and molecular architecture are tuned for high-shear injection filling of thin-walled closures. Using this grade in blow moulding would generate parison sag and poor diameter control because the high-shear flow properties do not translate to low-shear melt strength. Conversely, extrusion blow-moulding HDPE grades formulated for high melt strength may produce underfilled or dimensionally unstable injection-moulded closures due to lower flow length at equivalent melt temperature. This distinction is the principal operational boundary separating BORPURE MB5567 from other HDPE grades in the Borouge portfolio.
