| HS Code | 108289 |
| Density | 0.964 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 4.1 g/10 min |
| Tensile Modulus | 1500 MPa |
| Tensile Stress At Yield | 30 MPa |
| Tensile Strain At Yield | 9% |
| Tensile Strain At Break | >100% |
| Charpy Notched Impact Strength 23 C | 6 kJ/m² |
| Charpy Notched Impact Strength 30 C | 4 kJ/m² |
| Shore D Hardness | 64 |
| Vicat Softening Temperature A50 | 128°C |
| Melting Temperature | 135°C |
| Crystallization Temperature | 115°C |
| Thermal Conductivity | 0.40 W/m·K |
| Water Absorption | <0.01% |
As an accredited Borealis HDPE MG9641B factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE MG9641B is supplied in 25 kg polyethylene bags, palletized and shrink-wrapped for industrial handling and shipment. |
| Container Loading (20′ FCL) | Borealis HDPE MG9641B, palletized 25 kg bags, evenly loaded into 20-foot FCL container, braced and safely secured for sea transport. |
| Shipping | Borealis HDPE MG9641B is a non-hazardous high-density polyethylene resin, shipped as solid pellets in 25 kg bags, octabins, or bulk containers. It is not regulated for transport by DOT, ADR, IMDG, or IATA. No UN number, hazard class, labels, or placards required. Store dry, away from heat. |
| Storage | Store Borealis HDPE MG9641B in a cool, dry, well-ventilated area, preferably indoors. Keep in original sealed packaging on pallets, away from direct sunlight, heat, ignition sources, moisture, and incompatible materials. Avoid dust generation and contamination. Maintain good housekeeping and spill control; use first-in, first-out stock rotation. Follow local regulations and supplier recommendations. Do not store near food or drinking water. |
| Shelf Life | Borealis HDPE MG9641B has a 24-month shelf life when stored in original unopened packaging, cool, dry, away from direct sunlight. |
The conversion of Borealis HDPE MG9641B into thin-wall dairy spread containers with nominal sidewall thickness of 0.45–0.65 mm depends on high injection velocity and sequenced pack pressure rather than elevated melt temperature alone. Technical datasheet values for this grade list melt flow rate at 16 g/10 min under ISO 1133-1:2022 and density of 964 kg/m³ under ISO 1183-1:2019, placing it in the high-flow injection moulding domain required for flow length-to-wall thickness ratios above 200:1 in multi-cavity tools. The recommended melt temperature for thin-wall containers is 220–260 °C, with mould temperature held at 10–40 °C to shorten cooling time; lower mould temperatures reduce sink marks but increase differential shrinkage at thickness transitions exceeding 2:1. A hot runner system with valve-gated drops in 24- to 64-cavity tools is normally used, because open hot-tip systems produce gate stringing and uneven crystallisation that drives post-mould bowing. Food-contact conformity is evaluated under Commission Regulation (EU) No 10/2011 with overall migration limit of 10 mg/dm² using EN 1186-1 and EN 1186-3, and under FDA 21 CFR §177.1520 for olefin polymers in contact with aqueous, acidic, and fatty foods. The tensile modulus of approximately 1300 MPa measured per ISO 527-2:2012 reduces sidewall deflection during automatic filling and lidding, while the density of 964 kg/m³ supports stackability. Warpage on rectangular tubs with a diagonal of 150 mm is controlled by sequential valve gate opening; unsynchronised gate opening can induce post-mould bowing above 1.2 mm. Pellets stored at relative humidity above 60% are hopper-dried at 80 °C for 2 h because surface moisture generates splay on polished cavity surfaces. Mould shrinkage is typically 1.5–2.0%, and cavity dimensions for a 0.6 mm sidewall are cut to a predicted post-mould shrinkage of 1.8%. No nucleating masterbatch is required; addition of 2% of an incompatible nucleating package may raise crystallinity and create non-uniform shrinkage in thin sections.
| Measured property or compliance item | Standard or regulation | Typical value / requirement |
|---|---|---|
| Melt flow rate | ISO 1133-1:2022 | 16 g/10 min at 190 °C / 2.16 kg |
| Density | ISO 1183-1:2019 | 964 kg/m³ |
| Tensile modulus | ISO 527-2:2012 | 1300 MPa |
| Tensile yield stress | ISO 527-2:2012 | 28 MPa |
| Flexural modulus | ISO 178:2019 | 1450 MPa |
| Charpy notched impact | ISO 179-1:2023 | 6 kJ/m² at 23 °C |
| Vicat softening temperature | ISO 306:2022 | 126 °C |
| EU food contact overall migration | (EU) No 10/2011 | 10 mg/dm² |
| US food contact | FDA 21 CFR §177.1520 | Conditions of use B through H |
In industrial pail production with nominal fill volume of 5 L and sidewall thickness of 1.2–1.8 mm, substituting MG9641B for a blow-moulding HDPE with MFR below 2 g/10 min changes the relationship between gate pressure and solidification morphology. Injection moulding through a single central gate on a 700–1,000 t clamp force machine requires injection pressure of 70–100 MPa; the higher MFR of MG9641B reduces gate pressure drop by approximately 25–35% compared with 4 g/10 min HDPE at the same melt temperature. Stack-load capacity for a standard pail footprint exceeds 300 kg when the top rim thickness is maintained above 1.5 mm. Non-food industrial pails are validated under UN 6HA1 certification for solids and inner packaging for liquids, where drop testing at -18 °C after 24 h conditioning is specified. The notched Charpy impact of 6 kJ/m² at 23 °C per ISO 179-1:2023 is sufficient for single-use chemical packaging, but pails exposed to aggressive surfactants or oxidising agents should be stress-crack tested under ASTM D1693 with 10% Igepal CO-630 at 50 °C. Handle-mount sink marks occur when the rib-to-wall ratio exceeds 0.75:1; to limit overpacking, injection profile uses hold time of 4–6 s and cooling time of 10–14 s. Pigmented masterbatch addition of 1.5–3.0% narrows the processing window unless the carrier is LDPE or LLDPE. Mould texture of 12–25 µm Ra is applied to prevent vacuum adhesion during automatic demoulding; polished surfaces in this thickness range increase ejection force and can cause pin puncture.
Core pin deflection in 48- and 96-cavity closure tools running cycle times below 4.5 s is the dominant failure mode because thin tamper-evident band slots of 0.35–0.50 mm must be filled at high injection velocities up to 300 mm/s. Water-flow-regulated core pins with diameter of 10–15 mm and coolant temperature of 8–12 °C stabilise solidification of the band. Subgate diameter should be 0.8–1.2 mm to prevent premature freeze-off at the tamper bridge base. Removal torque after 24 h at 23 °C for closures moulded with thread engagement of 1.2 mm is typically above 1.5 N·m, although published data for this specific closure geometry and grade configuration is limited. Organoleptic conformity for beverage closures is assessed under (EU) No 10/2011 with sensory testing per EN 1622, and linerless closures fall under FDA 21 CFR §177.1520. Stress cracking in the tamper-evident hinge is tested under ASTM D1693 at 50 °C; silicone-containing mould release agents accelerate hinge cracking and should be replaced with non-silicone ester-based systems. Flexural modulus of approximately 1450 MPa per ISO 178:2019 provides thread engagement stiffness. For bridge width below 0.30 mm, injection speed is reduced to 120–160 mm/s and pack pressure reduced to 35–45 MPa to avoid jetting-induced knit lines. Production experience on 64-cavity electric moulding machines indicates that three-stage hold pressure reduces cap diameter variation to ±0.08 mm, while single-stage hold produces ±0.15 mm. Drying is not required for pellets stored below 50% RH; above that, hopper drying at 75–85 °C for 1–2 h eliminates surface moisture streaks.
For housewares and storage crates, a melt temperature of 230 °C and mould temperature of 20 °C are adequate for ejection after 12–18 s in wall sections of 2.0–3.0 mm.
Personal care jars and caps moulded from MG9641B do not receive the same food-contact migration testing as dairy tubs, but the finished article must be safe under Regulation (EC) No 1223/2009 for cosmetic products. HDPE is a poor barrier to non-polar fragrance and terpene components; oxygen transmission through a 1 mm wall is typically 150–200 cm³·mm/(m²·day·atm) under ASTM D3985 at 23 °C and 0% relative humidity, but the grade is not suitable for oxygen-sensitive active packaging. Containers for massage oils with high terpene content may lose more than 2% of fill weight over 90 days at 40 °C through wall permeation. Thick-walled cosmetic caps of 3.0–5.0 mm require reduced pack pressure of 25–35 MPa and extended cooling time of 20–30 s to prevent vacuum voids. Mould temperature of 15–25 °C balances surface gloss against sink mark formation. Tensile yield stress of 28 MPa per ISO 527-2:2012 provides snap-fit recovery, but cyclic assembly beyond 50 cycles may produce creep strain above 3%. Silicone-free mould release is necessary where post-mould painting or metallisation is required; silicone transfer above 0.1 µg/dm² is sufficient to cause adhesion failure.
Toy components moulded from MG9641B require conformity to EN 71-3:2019+A1:2021 migration limits for 19 elements; unpigmented HDPE grades typically show extractable lead below 0.5 mg/kg and cadmium below 0.1 mg/kg, but heavy-metal colour masterbatches are excluded. The high melt flow is favourable for miniature parts with wall thickness of 0.8–1.5 mm; however, impact at sub-zero temperatures is lower than MDPE, so outdoor winter toys are drop-tested per EN 71-1 from 850 mm at -20 °C. Residual odour is controlled with phthalate-free processing aids. Production-scale moulding of building-block inserts uses electric machines of 120–250 t clamp force, mould temperature of 20–30 °C, injection speed of 80–120 mm/s, and cooling time of 8–12 s. Gate vestige height below 0.1 mm is required for child-safe edges; valve-gated hot runner systems or automatic tunnel gates are specified. The high crystallinity of the grade causes haze, so transparent toy designs are not within the material’s capability envelope and an opaque or translucent pigmentation strategy is used.
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Borealis HDPE MG9641B is a high-density polyethylene injection-moulding grade supplied as natural or custom-coloured pellets. The grade designation contains a nominal density marker of 0.964 g/cm³, and lot-specific density is certified according to ISO 1183-1. The melt flow rate at 190 °C under 2.16 kg load is typically reported as 4.1 g/10 min when tested to ISO 1133-1. Articles produced from the material are intended for rigid packaging, closures, crates, and technical components in which stiffness, dimensional stability, and short cycle times are specified. The material is supplied with antioxidant and processing stabilisation. Grade-specific conformity statements for food contact, medical use, and drinking water are not uniform across production sites and must be obtained from the current Borealis product safety datasheet.
Relative to high-molecular-weight HDPE film and blow-moulding grades, MG9641B is positioned for injection moulding by a lower molecular weight, a controlled molecular weight distribution, and a melt flow rate that supports multi-cavity filling. Blow-moulding HDPE grades typically show melt flow rates below 1.0 g/10 min and higher melt strength; MG9641B is formulated to reduce die swell and fill long flow paths at lower hydraulic pressure. The density of 0.964 g/cm³ is higher than that of medium-density polyethylene and lower than that of highly filled or nucleated PP grades. The density increase relative to MDPE raises tensile modulus and top-load resistance but lowers low-temperature notched impact and environmental stress-crack resistance. The notched Charpy impact at -20 °C is therefore lower than that of a comparable 0.935 g/cm³ MDPE grade.
In closure and thin-wall packaging applications, MG9641B differs from general-purpose HDPE injection-moulding grades by the combination of density, flow, and additive package. The nominal density contributes to strip torque consistency and panel rigidity in caps, while the melt flow rate of 4.1 g/10 min allows short injection times in tools with 32 to 64 cavities. These processing characteristics are evaluated on single-screw reciprocating injection units with screw L/D ratios of 20:1 to 25:1 and compression ratios between 2.0:1 and 2.5:1. No twin-screw compounding is required. The grade is not intended for extrusion blow moulding or blown film because of insufficient melt strength for bubble stability.
| Property | Test method | Typical value | Unit |
|---|---|---|---|
| Density | ISO 1183-1 | 0.964 | g/cm³ |
| Melt flow rate (190 °C/2.16 kg) | ISO 1133-1 | 4.1 | g/10 min |
| Tensile modulus (1 mm/min) | ISO 527-2 | 1250 | MPa |
| Tensile stress at yield | ISO 527-2 | 28 | MPa |
| Tensile strain at yield | ISO 527-2 | 9 | % |
| Flexural modulus | ISO 178 | 1350 | MPa |
| Charpy notched impact strength at 23 °C | ISO 179-1/1eA | 5.0 | kJ/m² |
| Vicat softening temperature A/50 | ISO 306 | 128 | °C |
| Shore D hardness | ISO 868 | 64 | — |
Values in the table are typical for natural material and are not specification limits. Lot certificates issued against ISO 1183-1 and ISO 1133-1 should be used for acceptance testing. Mechanical data reported without specimen conditioning are not comparable; test specimens are conditioned at 23 °C and 50 % relative humidity for at least 40 h according to ISO 291 unless otherwise specified.
| Requirement | Standard or regulation | Typical grade status |
|---|---|---|
| Food contact for repeated use | FDA 21 CFR 177.1520 | Compliant per supplier declaration |
| EU food contact | Regulation (EU) No 10/2011 | Compliant per supplier declaration |
| REACH | Regulation (EC) No 1907/2006 | Monomer and additive registration required |
| RoHS hazardous substances | Directive 2011/65/EU | No restricted substances above threshold |
| Biological evaluation for medical use | ISO 10993 | Not tested at grade level |
Regulatory conformity is application-dependent. A grade-level statement for FDA 21 CFR 177.1520 is typically supplied for food-contact uses, but it does not cover migration limits for specific food simulants or processing conditions. Regulation (EU) No 10/2011 requires migration testing on the finished article; raw-material compliance alone is insufficient. Medical-grade use is outside the default specification of MG9641B unless explicitly identified under a separate healthcare product designation. Drinking water approval must be evaluated under the applicable national standard, such as AS/NZS 4020 or BS 6920, and cannot be inferred from food-contact status.
Melt temperature in the barrel should be maintained between 220 °C and 260 °C. At melt temperatures above 260 °C, residence time should be limited to 5 min to prevent molecular weight loss, discolouration, and off-taste formation. Mould temperature should be controlled from 10 °C to 40 °C; lower mould temperatures shorten cycle time but reduce weld-line strength and surface gloss. The injection velocity is set according to flow-length-to-wall-thickness ratio. For wall thicknesses below 1.0 mm, available filling time before flow-front solidification can fall below 0.5 s; published data for this specific configuration is limited. High injection speeds, in the range of 100 mm/s to 200 mm/s screw advance, are used to prevent premature freeze-off in thin-walled closures, with injection pressures typically between 60 MPa and 120 MPa hydraulic.
Pre-drying is not normally required when pellets are stored at relative humidity below 60 % and remain in sealed packaging until use. If surface condensation forms, a desiccant dryer at 80 °C for 2 h to 4 h removes surface moisture without causing pellet oxidation. Regrind from sprues and runners can be added to virgin material at levels up to 20 % by weight, provided that the regrind is dry, free of contamination, and not degraded by previous processing. Higher regrind percentages should be validated by measuring notched Charpy impact according to ISO 179-1/1eA and melt flow rate according to ISO 1133-1.
Industrial use of MG9641B includes closures, overcaps, thin-wall containers, crates, and technical mouldings. In closure production, the material’s 0.964 g/cm³ density supplies the top-load stiffness required for press-on and screw closures, while the melt flow rate allows stable filling of hot-runner tools with valve-gate nozzles. The material is used with hydraulic and electric injection moulding machines; clamp force requirements are calculated from the projected area and cavity pressure, typically 2.5 kN/cm² to 5.0 kN/cm². For multi-cavity closure tools, cavity-to-cavity mass variation below 0.3 % is achievable when the hot runner is balanced and the screw cushion is maintained between 2 mm and 5 mm.
Compared with low-density polyethylene grades, MG9641B has lower transparency, higher crystallinity, and higher softening temperature. The Vicat softening point of 128 °C permits brief contact with warm-fill liquids but does not allow retort conditions; continuous service under mechanical load should remain below 60 °C to 80 °C unless the application is validated. Compared with polypropylene closure grades, MG9641B has lower heat resistance and lower elastic modulus but provides better low-temperature impact and is less sensitive to mould temperature for crystallinity development. It is not a direct replacement for polypropylene in hot-fill or microwave applications where sustained temperatures exceed 100 °C.
The material should not be blended with amine-based nucleating agents or strong oxidising agents that can consume the antioxidant package and shift crystallisation kinetics. Avoid prolonged contact with hydrocarbon solvents and chlorinated solvents, which plasticise the amorphous phase and reduce environmental stress-crack resistance. For coloured compounds, masterbatches based on polyethylene carriers are preferred; polyester- or polystyrene-based carriers can create delamination and inconsistent impact. Environmental stress-crack resistance is generally lower than for HDPE grades with density below 0.950 g/cm³ and higher molecular weight. Where continuous contact with surfactants or oils is specified, ESCR performance should be tested according to ISO 22088-3 or ASTM D1693 using the actual service fluid. If the application requires long-term creep resistance, hydrostatic design stress data are not available for this grade, and it should not be used for pressure piping under ISO 4427.
Batch-to-batch consistency is controlled through melt flow rate and density release testing. Processing lots may show melt flow rate variation of ± 0.3 g/10 min around the nominal value; tools with very thin walls should be qualified on more than one lot to confirm that cavity filling and dimensional stability remain inside the specified process window. Shrinkage of MG9641B after injection moulding is anisotropic. Mould shrinkage in the flow direction is typically lower than in the transverse direction, and grade-level data should be supplemented by tool trials because shrinkage is influenced by gate geometry, packing pressure, and mould temperature.
Custom-coloured formulations are available with pre-compounded pigments. If the moulder introduces a masterbatch at the press, the carrier resin must be HDPE-compatible and the let-down ratio should not exceed 4 %. High let-down ratios of low-molecular-weight waxes can reduce melt viscosity and alter screw recovery. For applications requiring uv stability, a hindered amine light stabiliser package is supplied in weatherable variants; the standard MG9641B grade is designed for indoor or short-term outdoor exposure only.
In comparison with lower flow HDPE injection-moulding grades, MG9641B requires lower injection pressure to fill the same cavity, but the higher melt flow can increase flash sensitivity in tools with worn parting lines. Tool maintenance should therefore include verification of parting line flatness and clamp force. The grade also shows faster crystallisation than lower-density PE grades, which reduces moulded-in part temperature at ejection but increases warpage risk in flat lids with non-uniform wall thickness. Warpage can be mitigated by using a mould temperature of 20 °C to 30 °C and by optimising gate location to balance flow-front advancement.
