| HS Code | 532672 |
| Materialtype | High Density Polyethylene (HDPE) |
| Density | 0.964 g/cm³ |
| Meltflowrate | 8.0 g/10 min (190°C/2.16 kg) |
| Tensilemodulus | 1500 MPa |
| Tensilestressatyield | 30 MPa |
| Tensilestrainatyield | 8% |
| Tensilestrainatbreak | >100% |
| Charpynotchedimpactstrengthat23c | 5 kJ/m² |
| Charpynotchedimpactstrengthatminus30c | 3 kJ/m² |
| Vicatsofteningtemperature | 128°C (A50) |
| Meltingtemperature | 135°C |
| Crystallizationtemperature | 115°C |
| Ballindentationhardness | 65 MPa |
| Thermalconductivity | 0.4 W/m·K |
| Coefficientoflinearthermalexpansion | 1.2E-4 /°C |
| Waterabsorption | <0.01% |
| Volumeresistivity | >1E14 ohm·cm |
| Dielectricconstant | 2.3 |
As an accredited Borealis HDPE MG9641S factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE MG9641S is supplied in 25 kg polyethylene bags, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | Borealis HDPE MG9641S in 25 kg bags, floor-loaded into 20′ FCL containers, approximately 25 MT net, securely stowed for export. |
| Shipping | Borealis HDPE MG9641S is a non-hazardous polyethylene resin shipped as pellets in 25 kg PE bags or 1,000 kg octabins, palletized and stretch-wrapped. Transport in clean, dry trucks or containers at ambient temperature. Avoid moisture, direct sunlight, and extreme heat; no ADR/IMDG/IATA special provisions apply. |
| Storage | Store Borealis HDPE MG9641S in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original packaging closed and elevated off the floor to protect from moisture, dust, and UV light. Avoid excessive stacking, static buildup, and incompatible materials. Follow the supplier SDS and local regulations for safe handling. |
| Shelf Life | Borealis HDPE MG9641S: store dry below 50°C in original sealed packaging; typical shelf life is 2 years, protected from sunlight and moisture. |
Borealis HDPE MG9641S is a high-flow injection moulding grade with nominal density 0.964 g/cm³ per ISO 1183-1:2019 and nominal melt flow rate 26 g/10 min at 190°C/2.16 kg per ISO 1133-1:2022. In thin-wall single-serve dairy packaging this material is processed on stack moulds with cavity counts of 24 to 48 and valve-gated hot runners. At wall thicknesses of 0.38 mm to 0.55 mm, the flow length-to-wall ratio routinely exceeds 150:1. Melt temperature is maintained at 225°C to 245°C and injection velocity at 180 mm/s to 300 mm/s; below 180 mm/s the frozen skin thickens until the effective flow channel closes and short shots appear, while above 300 mm/s parting-line vent clearances must be 0.02 mm to 0.03 mm to prevent burn marks from adiabatic compression of trapped gas. Mould temperature is held at 8°C to 15°C. Holding pressure is set at 40 MPa to 55 MPa for 2.5 s to 4.5 s, and melt cushion is kept at 3 mm to 5 mm to maintain gate sealing and compensate for post-fill shrinkage. Regulatory compliance for dairy contact includes EU Regulation (EU) No 10/2011 overall migration limit 10 mg/dm², FDA 21 CFR 177.1520(c) 3.1b, and EC 1935/2004. Formulation addition ratio: base resin typically 94.0 wt% to 96.5 wt%; white LDPE masterbatch with 60 wt% TiO₂ at 3.0 wt% to 5.0 wt%; erucamide slip masterbatch at 0.5 wt% to 1.0 wt%, yielding 500 ppm to 900 ppm erucamide in the final part; antioxidant masterbatch at 0.2 wt% to 0.4 wt% when post-industrial trim exceeds 5 wt%. Final products are 125 ml to 500 ml injection moulded yoghurt cups, sour cream tubs, dessert pots, and snap-on lids.
Monolayer screw closures moulded from MG9641S are produced in 28 mm and 38 mm formats with tamper-evident bands. In this geometry, melt flow rate is not the limiting variable; bridge-to-bridge thickness variation and anisotropic shrinkage around the gate generate out-of-round caps and uneven tear-band release. The melt temperature is restricted to 225°C to 240°C because residence times above 12 minutes at 255°C cause oxidative chain scission that lowers bridge tear strength. Mould temperature below 5°C freezes gate-area orientation and produces eccentric annular slitting, whereas above 18°C cooling time extends beyond 6 s and reduces output on high-cavitation stack moulds. Injection speed is set at 80 mm/s to 120 mm/s; holding pressure 30 MPa to 45 MPa; cooling time 4 s to 6 s. Closure slit dimensions are typically 0.8 mm to 1.0 mm wall with bridge count configured by brand-specific tooling; published torque retention thresholds for MG9641S-specific bridge geometry are limited because torque is dominated by slit length, bridge land thickness, and residual stress state rather than by resin melt flow rate alone. Compliance: EU Regulation (EU) No 10/2011, FDA 21 CFR 177.1520(c) 3.1b for aqueous and dairy contact, and good manufacturing practice under EC 2023/2006. Formulation addition ratio: base resin 96.0 wt% to 98.0 wt%; high-purity white masterbatch 1.5 wt% to 2.5 wt%; erucamide slip 400 ppm to 800 ppm by final part weight; process stabiliser masterbatch 0.3 wt% to 0.5 wt% when in-house regrind exceeds 15 wt%. Final products are still-water, dairy-drink, and dry-grocery screw caps with tamper-evident bands.
Disc-top and flip-top closures for personal care formulations are injection moulded from MG9641S in two-plate tools with edge gating, where the gate is located on the side wall rather than directly opposite the hinge. This placement forces melt flow parallel to the hinge axis and avoids transverse molecular orientation that reduces flexural endurance. The hinge web thickness is 0.25 mm to 0.35 mm; if it drops below 0.25 mm, incomplete filling occurs in multi-cavity tools when injection speed is under 40 mm/s, while thickness above 0.35 mm generates excessive hinge stiffness and white-blooming on first flexure. Melt temperature is held at 215°C to 235°C; mould temperature 12°C to 18°C; holding pressure 35 MPa to 45 MPa; cooling time 4 s to 6 s. Published MG9641S-specific hinge endurance data are limited; processors validate flexural fatigue through in-house repeated-actuation fixtures rather than resin-level ISO data. Compliance is primarily REACH 1907/2006 for packaging articles and, where the closure contacts cosmetic formulations, the packaging must not release substances that alter product stability under EU Regulation (EC) No 1223/2009. Formulation addition ratio: base resin 96.5 wt% to 98.5 wt%; glycerol monostearate antistat at 0.10 wt% to 0.25 wt%; silicone masterbatch at 0.5 wt% to 1.0 wt% to reduce friction during cap tightening; colour masterbatch 0.5 wt% to 1.5 wt%. Final products are 24 mm disc-top caps, flip-top lids, and push-pull closures for shampoo, body wash, conditioner, and dilute homecare bottles. Sustained contact with concentrated anionic surfactants above 40°C is an operational boundary because environmental stress cracking can initiate at the hinge if moulded-in stress is not controlled through pack pressure and cooling uniformity.
Domestic storage boxes and drawer organisers moulded from MG9641S use wall thickness 2.5 mm to 4.0 mm. In these thicker sections, semicrystalline HDPE shrinkage of 1.5% to 2.5% after cooling from 130°C to 40°C dictates rib-to-wall ratio: ribs are capped at 0.5:1 to 0.6:1; any rib root thicker than 0.8 of the adjoining wall produces sink marks visible on the outer surface. Bosses are designed with cored walls 60% of nominal and are spaced at least 2.5 mm apart to avoid bridging. Melt temperature is lowered to 210°C to 225°C and injection speed to 25 mm/s to 45 mm/s to avoid jetting in deep-draw cavities. Holding pressure is raised to 45 MPa to 60 MPa and held for 8 s to 15 s to compensate for volumetric shrinkage; mould temperature is 10°C to 25°C. Processing is conducted on 250 t to 400 t hydraulic injection machines with accumulator-assisted screws. Compliance for food-contact storage uses EU Regulation (EU) No 10/2011, FDA 21 CFR 177.1520(c) 3.1b, and GB 4806.7-2016 for export to China. Formulation addition ratio: base resin 88.0 wt% to 94.0 wt%; calcium carbonate masterbatch 5.0 wt% to 10.0 wt% to reduce post-mould shrinkage to 0.8% to 1.4% and increase flexural modulus; colour masterbatch 1.0 wt% to 2.0 wt%; slip additive is generally excluded to preserve print and label adhesion. Products include stackable storage boxes of 5 L to 25 L, cutlery trays, kitchen drawer organisers, and under-bed utility bins.
Closed-loop regrind use in injection moulded non-food logistics containers imposes a stabilisation-limited processing window. MG9641S is formulated with a nominal melt flow rate of 26 g/10 min, but post-industrial regrind exposed to more than one thermal cycle above 240°C can exhibit an upward MFR shift of 2 g/10 min to 5 g/10 min due to chain scission. When regrind fraction exceeds 30 wt%, the moulder must reduce melt temperature by 5°C to 10°C and increase holding pressure by 5 MPa to 10 MPa to maintain consistent fill and packing. Pre-drying is not applied because HDPE is hygroscopic; it is applied at 70°C to 80°C for 2 h to remove surface condensation from outdoor storage of regrind flake, which would otherwise produce splay and dimensional scatter. Wall thickness ranges from 3.0 mm to 5.0 mm; cooling time is 18 s to 30 s; injection pressure is 70 MPa to 95 MPa; mould temperature 10°C to 20°C. Compliance for these non-food industrial articles falls under REACH 1907/2006 and, for black logistics containers intended for waste collection, EN 840-1:2020 may apply to dimensional and lifting features when part design aligns with bin standards. Formulation addition ratio: virgin base resin 50.0 wt% to 80.0 wt%, post-industrial regrind 20.0 wt% to 50.0 wt%; antioxidant masterbatch 0.5 wt% to 1.0 wt% to restore melt stability; carbon black masterbatch 1.0 wt% to 2.0 wt% for UV resistance. Final products are stackable tote boxes, warehouse trays, and distribution containers.
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Borealis HDPE MG9641S is a high-density polyethylene injection-moulding grade supplied as natural pellets or in selected pigment masterbatch versions. The grade is identified in the Borealis olefin portfolio by a nominal melt flow rate of 8.0 g/10 min at 190 °C/2.16 kg under ISO 1133-1:2022, and a nominal density of 0.964 g/cm³ under ISO 1183-1:2019. Tensile yield stress is reported at 28 MPa when measured on Type 1A specimens at 50 mm/min according to ISO 527-2:2012. Tensile modulus is reported at 1,300 MPa. Charpy notched impact strength at 23 °C under ISO 179-1:2010 is reported at 4.0 kJ/m². Vicat softening temperature, Method A50 under ISO 306:2022, is reported at 126 °C. These values are nominal lot averages and do not constitute specification limits; the certificate of analysis for the specific production batch remains the controlling document.
The nominal property set can be supplemented by differential scanning calorimetry under ISO 11357-3:2018; the peak melting temperature is typically in the range 130 °C to 135 °C, and crystallization onset is observed near 117 °C at a cooling rate of 10 K/min. These values influence gate-freeze and hold-pressure timing more than the melt flow rate alone. For high-speed production, the solidification rate is governed by the temperature difference between the mould wall and the crystallization onset, not solely by the mould temperature setpoint. A mould temperature increase from 15 °C to 30 °C extends gate freeze-off time but also increases cycle time by approximately 0.8 s per 1 mm of wall thickness. This trade-off is critical in multi-cavity tools with hot-runner valve gates.
From a processing-equipment perspective, MG9641S is used on high-cavitation injection moulding machines with clamp forces from 1,500 kN to 4,500 kN. Barrel zones are typically set from 180 °C to 230 °C, with nozzle temperature between 210 °C and 230 °C. Mould surface temperatures of 10 °C to 30 °C are maintained for wall sections between 0.8 mm and 2.5 mm. Screw plasticating units with L/D ratios of 20:1 to 24:1 and compression ratios from 2.0:1 to 2.5:1 are adequate. Injection pressures of 60 MPa to 90 MPa are typical on balanced cold-runner layouts, with holding pressure set at 40% to 70% of peak injection pressure. Back pressure is held at 0.5 MPa to 1.5 MPa, and screw circumferential speed is limited to 0.3 m/s to 0.6 m/s to avoid excessive shear heating.
In thin-wall packaging tools, the high melt flow of MG9641S reduces flow-length sensitivity to temperature, but it also shortens the available holding-pressure window. For a spade gate of 1.0 mm thickness and a nominal wall of 1.2 mm, hold time of 4 s to 7 s is sufficient at a mould temperature of 20 °C. If velocity-to-pressure switch-over is delayed beyond 0.1 s after volumetric filling, cavity pressure can overshoot above 45 MPa and produce flash at the parting line. If switch-over occurs too early by more than 0.1 s, sink marks form over bosses and rib intersections. This processing conflict is more severe with MG9641S than with lower-flow HDPE grades because the lower melt viscosity provides less compressibility for pressure transmission after the gate begins to freeze.
Direct substitution of MG9641S into an extrusion blow-moulding tool designed for fractional-melt HDPE is contraindicated. Blow-moulding HDPE grades typically have melt flow rates below 1.0 g/10 min, which generate the die-head pressure and melt strength needed for parison sag resistance. MG9641S, at 8.0 g/10 min, has reduced shear viscosity and less parison stability under continuous extrusion. In injection moulding, the same viscosity reduction shortens plastication time. A 35 mm diameter screw with 22:1 L/D operating at 120 min⁻¹ and a shot weight of 120 g can be expected to recover in approximately 3.5 s if HDPE melt density is taken as 0.78 g/cm³ and throughput is 130 kg/h. Lower-flow closure-grade HDPE at the same screw speed requires longer recovery because of higher melt viscosity. The limiting equipment issue is usually non-return valve sealing: ring non-return valves with radial clearance greater than 0.05 mm show shot-weight variability above ±1.5%. Ball-check or poppet non-return valves with sealing angles of 45° to 60° are preferred for high-cavitation operation.
Gate freeze-off is affected by fast crystallization. Melt temperature should not fall below 190 °C, otherwise surface flow marks and inconsistent gate sealing occur. At 240 °C melt temperature, gate sealing proceeds rapidly once the mould extracts latent heat; a 1.0 mm gate freezes before the distant flow path can be packed if hold time is less than 3 s. The practical window of 4 s to 7 s is narrower than that of fractional-melt grades because the lower molecular weight reduces the time that the gate remains molten under pressure.
MG9641S is positioned as an injection-moulding HDPE for stiff, thin-walled articles. Its property set differs from closure-grade BorPure MB6561 and pipe-grade BorSafe HE3490-LS in three areas: melt viscosity, stress-crack resistance, and long-term hydrostatic strength. The following comparison is based on published nominal datasheet values and is intended for screening; the current revision of each grade datasheet should be consulted before specification.
| Grade | Nominal density (g/cm³) | Nominal melt flow rate | Standard/condition | Main processing route | Controlling requirement |
|---|---|---|---|---|---|
| MG9641S | 0.964 | 8.0 g/10 min | ISO 1133-1:2022, 190 °C/2.16 kg | High-speed injection moulding | Short cycle, thin-wall fill, dimensional stability |
| BorPure MB6561 | 0.956 | 1.9 g/10 min | ISO 1133-1:2022, 190 °C/2.16 kg | Injection and compression moulding of closures | Stress-crack resistance, hinging, organoleptic performance |
| BorSafe HE3490-LS | 0.959 | 0.23 g/10 min at 190 °C/5 kg | ISO 1133-1:2022 | Pipe extrusion | Long-term hydrostatic strength, slow crack growth, rapid crack propagation |
Compared with BorPure MB6561, MG9641S offers higher melt flow at the cost of lower stress-crack resistance because the lower molecular weight reduces the tie-molecule density that bridges crystallites. Environmental stress-crack resistance is inversely related to melt flow; therefore MG9641S should not be used for articles in continuous contact with polar surfactants or hydrocarbon-based stress-cracking agents unless article-specific validation under ASTM D1693-15, Condition B has been completed. Published data for MG9641S under this specific configuration is limited; article-level data must be generated for the final part geometry. Compared with BorSafe HE3490-LS, MG9641S is not suitable for pressurised water or gas distribution pipe; it lacks the required long-term hydrostatic strength verified by ISO 9080:2022 and rapid crack propagation performance assessed by ISO 13477:2008. Conversely, pipe-grade HE3490-LS is unsuitable for thin-wall injection moulding due to its high melt viscosity and high shear heating in small gates.
MG9641S can be evaluated for food-contact use under the olefin polymer monograph of FDA 21 CFR 177.1520 when the final article is produced under conditions that do not introduce non-compliant additives or degradation products. The European framework is Commission Regulation (EU) No 10/2011; the final article must be tested under its specific geometry and end-use conditions because resin data alone do not establish overall migration or specific migration compliance. For heavy metals and restricted substances in electrical and electronic components, the resin may be assessed against Directive 2011/65/EU, Annex II, with verification that cadmium, lead, mercury, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers do not exceed the specified maximum concentration values. REACH registration obligations under Regulation (EC) No 1907/2006 apply at the substance and article level; suppliers of the final article must communicate substances of very high concern above 0.1% w/w under Article 33.
For potable-water contact, approval is not automatic. The final article must be tested according to national acceptance schemes such as EN 12873-1, BS 6920, or equivalent local requirements. The use of recycled or regrind material in potable-water articles should be excluded unless the specific regulatory scheme permits closed-loop recyclate. Melt temperature excursions beyond 260 °C during processing may introduce oxidative degradation products that affect organoleptic and food-contact suitability; such excursions should be recorded and investigated as non-conformance events.
Although HDPE is not hygroscopic, surface moisture condenses on cold pellets when material is transferred from an unheated silo or warehouse into a warm production hall. At ambient relative humidity above 60%, moisture-induced splay marks can appear in thin-wall parts because water vapour is trapped at the melt front. The corrective measure is not to raise melt temperature above 260 °C; instead, pellets should be pre-dried in a desiccant dryer at 70 °C to 80 °C for 2 h to 3 h with a dew point of -30 °C or lower. At relative humidity below 40%, drying is typically unnecessary.
The melt-temperature ceiling is 260 °C. Above that threshold, oxidative chain scission accelerates and can generate odour, discolouration, and reduction of Charpy notched impact strength. The recommended heat-hold interval is not more than 5 min at melt temperatures above 240 °C. If the machine is stopped for more than 10 min at processing temperature, the barrel should be purged with a thermally stable polypropylene purge compound at 180 °C to 220 °C. Avoid combining the grade with unapproved nucleating agents or metallic stearates that alter crystallinity or yellowing behaviour. Contamination with PET or PVC in recycled feedstocks should be limited; PET particles create visible undispersed contamination because PET melts above 250 °C and does not plasticate at HDPE barrel temperatures, causing gate blockages in hot-runner tips.
In injection-moulded articles, post-mould dimensional stability is influenced by cooling rate and density gradients. With a part ejected at 80 °C, subsequent shrinkage at 23 °C can reach 1.5% to 2.0% over 24 h. Fixture checks should therefore be delayed until thermal equilibration is complete. This is especially relevant for stackable containers and crates where interlocking dimensions are specified to ±0.2 mm.
