| HS Code | 769075 |
| Polymer Type | High Density Polyethylene (HDPE) |
| Density | 962 kg/m³ |
| Melt Flow Rate 190 C 2 16 Kg | 21 g/10 min |
| Tensile Modulus | 1500 MPa |
| Tensile Stress At Yield | 30 MPa |
| Tensile Strain At Yield | 8% |
| Charpy Notched Impact Strength At 23 C | 6 kJ/m² |
| Charpy Notched Impact Strength At 30 C | 4 kJ/m² |
| Ball Indentation Hardness | 60 MPa |
| Vicat Softening Temperature | 127 °C |
| Heat Deflection Temperature | 75 °C |
| Melting Temperature | 133 °C |
| Mold Shrinkage | 1.5-2.0% |
| Water Absorption | <0.01% |
| Environmental Stress Crack Resistance Escr | >1000 h |
| Uv Stabilization | Yes |
| Colour | Black |
As an accredited Borealis HDPE MG9621S factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis HDPE MG9621S is supplied in 25 kg polyethylene bags, stacked on pallets with 55 bags per pallet (1,375 kg). |
| Container Loading (20′ FCL) | Borealis HDPE MG9621S is loaded into 20′ FCL as palletized 25 kg bags, stretch-wrapped and secured for safe ocean transport. |
| Shipping | Borealis HDPE MG9621S is a non-hazardous high-density polyethylene solid. It is typically shipped in 25 kg bags on pallets or in bulk containers. Not regulated for transport under DOT, ADR, IMDG, or IATA. Keep dry, avoid UV exposure, and prevent package damage during transport. |
| Storage | Store Borealis HDPE MG9621S in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep bags or containers sealed, palletized, and protected from moisture, dust, and contaminants. Avoid contact with strong oxidizing agents. Maintain moderate temperatures and use first-in, first-out stock rotation. Do not expose to UV; keep away from incompatible materials. |
| Shelf Life | Shelf life: two years from production date when stored dry, cool, ventilated, away from direct sunlight, in original packaging. |
Borealis HDPE MG9621S is a high-density polyethylene grade positioned for injection moulding operations where melt flow stability and thin-wall fill behaviour determine scrap rates. Published datasheet values for this grade include a nominal density of 0.962 g/cm³ measured under ISO 1183-1, a melt flow rate of 21 g/10 min at 190 °C under a 2.16 kg load in ISO 1133-1:2022, a Vicat softening temperature of approximately 126 °C under ISO 306/A50, and a tensile modulus of approximately 1,300 MPa under ISO 527-2. The grade is typically processed without drying unless surface condensation occurs during transition from cold storage to warm production environments; in that case, pre-drying at 80 °C for 2 h is applied. Injection moulding screws with an L/D ratio of 20:1 to 25:1 and a compression ratio of 2.5:1 are suitable. The material is used where high stiffness, rapid solidification, and consistent production speed are required, and the following downstream application segments are differentiated by their process controls, compliance anchors, and formulation practices.
The regulatory anchors for the downstream applications are summarised in the following compliance matrix.
| Application | Primary compliance anchor | Migration / condition |
|---|---|---|
| Thin-wall dairy containers | Commission Regulation (EU) No 10/2011; FDA 21 CFR 177.1520 | 10 mg/dm² overall migration limit; food simulants A, B, D2 |
| Caps and closures | EU Regulation (EC) No 1935/2004; FDA 21 CFR 177.1520 | Overall migration 10 mg/dm²; conditions of use A–H |
| Logistics crates | REACH; RoHS Directive 2011/65/EU; ISO 11469 | No food-contact default; EU 10/2011 only if direct food contact |
| Industrial pails | UN Model Regulations 6.1.5; 49 CFR 178.509 | Drop, leakproofness, stack tests per packaging group II/III |
| Housewares | FDA 21 CFR 177.1520; REACH | Food-contact only for non-fatty aqueous simulant unless tested |
| Masterbatch carrier | REACH Article 33; ISO 11469 | Final article classification under Commission Regulation (EU) 2020/878 SDS requirements |
In thin-wall dairy and deli container manufacture, the limiting production variable is not plastication throughput but solidification time in the cavity. Borealis HDPE MG9621S is processed on high-speed injection moulding machines with clamp forces typically in the 2,000 kN to 3,500 kN range, using melt temperatures between 200 °C and 240 °C, mould temperatures held at 10 °C to 30 °C, and cooling times of 5 s to 9 s. The high melt flow rate of 21 g/10 min under ISO 1133-1:2022 permits filling of wall sections below 0.8 mm without excessive injection pressure, but the same flow characteristic reduces melt viscosity and requires shot-to-shot variation below ±0.5%. Compliance for these containers is governed by Commission Regulation (EU) No 10/2011 and its amendments, with an overall migration limit of 10 mg/dm² for food-contact plastic materials, and by FDA 21 CFR 177.1520 for olefin polymers under conditions of use A through H. In production formulations, the grade is dosed at 96 wt% to 98 wt%, combined with 2 wt% to 4 wt% white TiO₂ masterbatch; where denesting or slip function is required, a silicone-based or amide-based slip masterbatch is added at 0.5 wt% to 1.5 wt%. The process produces 250 mL to 1,000 mL dairy, deli, and convenience food tubs and their complementary thin-wall lids, with the restriction that amide-based slip packages must be validated under EU Regulation (EC) No 1935/2004 for organoleptic compatibility before use in high-fat or long-shelf-life products.
Beverage and dairy closure moulding with Borealis HDPE MG9621S is dominated by gate freeze-off timing and the maintenance of tamper-evident bridge dimensions. The grade is processed in high-cavitation tools of 48 to 96 cavities, using hot runner systems with valve gate pins of 0.8 mm to 1.4 mm diameter. Melt temperature is typically kept between 220 °C and 245 °C, mould temperature between 8 °C and 15 °C, and total cycle time between 8 s and 15 s. Dimensional control for the tamper-evident band requires outside diameter variation within ±0.08 mm and bridge thickness variation within ±0.03 mm, measured by optical coordinate measuring systems on production lines. The closure formulation commonly consists of 97 wt% to 98.5 wt% MG9621S, 1 wt% to 2 wt% colour masterbatch, and 0.5 wt% to 1.0 wt% of a nucleating or slip masterbatch. The nucleating package raises crystallisation temperature and can shorten gate freeze-off time, but it must not reduce bridge elongation below the values required by ASTM D638-14 for tamper-evident failure. Food-contact compliance is covered by Commission Regulation (EU) No 10/2011, with an overall migration limit of 10 mg/dm², and by FDA 21 CFR 177.1520. The process yields 28 mm and 38 mm tamper-evident closures for non-carbonated beverages, dairy products, liquid food products, and personal care packaging, with linerless designs requiring a smooth sealing surface finish of Ra 0.8 µm or better on the closure bore.
In high-cavitation logistics crate moulding, the use of a 21 g/10 min melt flow HDPE changes the acceptable gate count and flow-length threshold. Borealis HDPE MG9621S is dry-blended with post-consumer recycled HDPE at 75 wt% to 80 wt% prime resin and 15 wt% to 20 wt% recycled material with a melt flow rate of 4 g/10 min to 10 g/10 min. Colour masterbatch is added at 1 wt% to 2 wt%; for outdoor stacking trays, a hindered amine light stabiliser masterbatch is added at 0.3 wt% to 0.8 wt%, with accelerated weathering acceptance testing under ISO 4892-2 cycle 1 method A. The moulding equipment is typically a two-platen injection machine with clamp force from 6,000 kN to 12,000 kN, using multi-point direct sprue or sequential valve gating to prevent knit lines in handle areas. Melt temperature is set between 230 °C and 250 °C, mould temperature between 10 °C and 20 °C, and cooling time between 25 s and 40 s. Compliance for general logistics crates is anchored to REACH, RoHS Directive 2011/65/EU, and polymer marking under ISO 11469; when the crate is used as a bakery or fruit tray with direct food contact, Commission Regulation (EU) No 10/2011 applies and the recycled fraction must meet food-contact purity. The final parts are 600 mm × 400 mm Euro stack/nest crates, bread trays, fruit crates, and distribution totes with load ratings commonly verified by static stack testing under ISO 2233 rather than by resin datasheet values alone.| Processing segment | Melt temperature | Mould / extruder temperature | Cycle / specific parameter |
|---|---|---|---|
| Thin-wall injection moulding | 200 °C–240 °C | 10 °C–30 °C | 5 s–9 s cooling |
| Closure injection moulding | 220 °C–245 °C | 8 °C–15 °C | 8 s–15 s cycle time |
| Crate injection moulding | 230 °C–250 °C | 10 °C–20 °C | 25 s–40 s cooling |
| Pail injection moulding | 200 °C–235 °C | 10 °C–20 °C | 18 s–35 s cycle |
| Houseware injection moulding | 200 °C–230 °C | 15 °C–30 °C | 12 s–22 s cycle |
| Twin-screw carrier compounding | 180 °C–220 °C | Die 190 °C–210 °C | Specific energy 0.18 kWh/kg–0.28 kWh/kg |
Industrial pail production from Borealis HDPE MG9621S is constrained by environmental stress crack resistance after filling with surface-active liquids and by drop-impact performance at low temperatures. The pail moulding process uses injection moulding machines with clamp forces from 3,500 kN to 8,000 kN, side-entry or direct hot runners, melt temperatures of 200 °C to 235 °C, and mould temperatures of 10 °C to 20 °C. Cycle times for 5 L to 20 L pails typically fall between 18 s and 35 s depending on wall thickness from 1.6 mm to 2.8 mm. For UN-certified packaging, the finished pail must satisfy the stacking, leakproofness, and drop tests described in 6.1.5.6, 6.1.5.3, and 6.1.5.4 of the UN Model Regulations, and marking under 49 CFR 178.509 for US shipments. Converters must run internal qualification for packaging group II or III liquids because published data for this specific grade in all packaging groups is limited. The formulation is 98 wt% MG9621S with 2 wt% carbon black or white masterbatch; for outdoor-stored pails, 0.3 wt% to 0.5 wt% UV stabilizer masterbatch is added, and for detergent pails an anti-static package is used at 0.5 wt% to 1.0 wt%. Since the resin has a high density near 0.962 g/cm³, stress cracking resistance is lower than that of medium-density PE; corner radii below 2 mm and excessive handle insert preload should be avoided unless ESCR testing under ASTM D1693 Condition B demonstrates adequate field performance. End products are 5 L, 10 L, 15 L, and 20 L open-head pails for detergents, building chemical compounds, and industrial liquids.
For household storage articles and small appliance components, medium-tonnage injection machines running Borealis HDPE MG9621S require careful attention to shrinkage, texture depth, and ejection forces. The flexural modulus of the material is approximately 1,300 MPa under ISO 178, which provides stackability but also increases ejection load when mould polish is insufficient or draft angles drop below 1° to 2°. Mould surfaces are specified according to VDI 3400 texture classes between 24 and 36, balancing scratch masking against release. The processing window on machines of 1,500 kN to 4,000 kN clamp force uses melt temperatures of 200 °C to 230 °C and mould temperatures of 15 °C to 30 °C, with cycle times of 12 s to 22 s. Formulation addition ratios are 97 wt% to 99 wt% MG9621S with 1 wt% to 3 wt% colour masterbatch; special-effect masterbatches containing pearlescent or metallic pigments are used at 2 wt% to 4 wt% and require static mixers to prevent flow lines. Food-contact housewares are covered by FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011 when intended for direct contact, while general-purpose articles are placed on the market under REACH and marked under ISO 11469. The downstream product range includes stackable storage boxes, buckets, hangers, appliance housings, and seating components, with the restriction that continuous exposure to strong oxidising acids or aromatic hydrocarbons at temperatures above 60 °C is outside the practical chemical resistance window.In compounds where Borealis HDPE MG9621S functions as the carrier resin, the free-flowing pellet geometry and high melt flow permit efficient pigment and additive wetting in co-rotating twin-screw extruders with L/D ratios from 36:1 to 44:1. Extrusion temperatures are set between 180 °C and 220 °C across nine to twelve barrel zones, with die temperatures from 190 °C to 210 °C. Specific mechanical energy input is typically in the range of 0.18 kWh/kg to 0.28 kWh/kg, and operators monitor drive torque to avoid exceeding the gearbox nameplate rating during high-load carbon black dispersion. The carrier is added at 50 wt% to 70 wt%, the active pigment or functional additive at 20 wt% to 40 wt%, and a wax or fatty acid salt dispersant at 5 wt% to 10 wt%. Compliance requirements for masterbatch feedstock include communication under REACH Article 33 for substances of very high concern, polymer identification under ISO 11469, and Directive 2011/65/EU when the final masterbatch enters electrical or electronic equipment. For carbon black masterbatches, melt filtration uses screen packs of 200 µm to 400 µm, and pressure drop across the screen changer is maintained below 120 bar to avoid degradation. The extrudate is strand pelletised or underwater pelletised. The resulting masterbatches are let down at 2 wt% to 5 wt% in HDPE and LDPE film, blow moulding, and injection moulding applications, with published data for this specific carrier configuration under all twin-screw operating points being limited; conversion trials must confirm pigment dispersion under EN 13900-5 and filter pressure rise per batch.
Competitive Borealis HDPE MG9621S prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8618136850665 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8618136850665
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Borealis HDPE MG9621S is a high-density polyethylene injection-moulding grade produced on a Borstar dual-reactor cascade. The grade is typically supplied as natural spherical pellets for thin-wall closures, caps, over-caps, and small technical mouldings where cycle time, dimensional stability, and resistance to environmental stress cracking are joint constraints. Nominal lot-average properties include a density of 0.962 g/cm³ under ISO 1183-1 and a melt flow rate of 2.1 g/10 min under ISO 1133-1 at 190°C and 2.16 kg. The molecular architecture is bimodal: a low-molecular-mass fraction reduces melt viscosity during injection, while a high-molecular-mass fraction raises solid-state toughness and creep resistance. This structural arrangement differs from single-reactor unimodal HDPE of identical density and flow because the usual inverse relationship between density and slow crack growth performance is partially decoupled. The grade is not intended for extrusion blow moulding or film; its melt strength and drawability are lower than blow-moulding HDPE grades, and parison wall-thickness stability is therefore less forgiving. In injection moulding, the resin is specified for hot-runner tools with high cavitation density and short flow-path-to-wall-thickness ratios below approximately 150:1.
The mechanical and thermal data in Table 1 are representative values reported in supplier technical literature; they should be read as lot-average guidance, not as guaranteed minimum specification. The test methods are the current ISO designations at the time of publication.
| Property | Typical value | Test method |
|---|---|---|
| Density | 0.962 g/cm³ | ISO 1183-1 |
| Melt flow rate (190°C/2.16 kg) | 2.1 g/10 min | ISO 1133-1 |
| Tensile modulus (1 mm/min) | 1300 MPa | ISO 527-2 |
| Tensile stress at yield (50 mm/min) | 28 MPa | ISO 527-2 |
| Tensile strain at yield | 8% | ISO 527-2 |
| Vicat softening temperature A50 (10 N) | 128°C | ISO 306 |
| Shore D hardness (15 s) | 64 | ISO 868 |
The melt rheology of MG9621S under capillary flow shows pronounced shear thinning. At typical melt temperatures of 200°C to 250°C, the viscosity is sufficiently low to fill thin-wall sections in multi-cavity tools while retaining adequate melt homogeneity for stable hot-runner valve-gate operation. The upper processing limit of 250°C is applied to limit oxidative chain scission and colour development. The solid-state density of 0.962 g/cm³ places the resin in the upper region of the HDPE density range; this contributes stiffness but also increases mould shrinkage anisotropy compared with lower-density grades. Mould shrinkage is typically 1.5% to 2.5% in the flow direction and 1.0% to 2.0% transverse, depending on gate geometry and holding pressure. Published data for this specific configuration is limited, and cavity-specific shrinkage studies are required for critical dimensions.
The Borstar dual-reactor cascade polymerises MG9621S in a slurry-loop reactor followed by a gas-phase reactor. The first reactor produces a low-molecular-mass polymer fraction with crystallinity and flow, and the second reactor produces a high-molecular-mass fraction with controlled short-chain branch content. In contrast, conventional unimodal HDPE made in a single slurry or gas-phase reactor has a narrower molecular weight distribution and a comonomer distribution that is not segregated by chain length. The consequence in the solid state is that the high-density lamellae of MG9621S contain a larger number of tie molecules connecting crystalline lamellae. Those tie molecules increase the resistance to slow crack growth under constant load, as evaluated by the full notch creep test under ISO 16770:2019. Published data for this specific configuration is limited, but comparative testing on bimodal HDPE pipe and closure grades has shown failure time improvements of one to two orders of magnitude over unimodal HDPE at the same density when tested at 50°C in 2% nonylphenol ethoxylate surfactant at an initial stress of 3.0 MPa. The low-molecular-mass fraction contributes a similar melt flow rate to a unimodal grade but with lower extruder torque and lower melt-pressure fluctuation. This is particularly relevant in all-electric injection machines with load-sensitive servo drives, where melt-pressure stability below ±0.5 MPa influences shot-to-shot consistency.
Relative to metallocene-catalysed HDPE of similar density and melt flow rate, MG9621S generally has a broader molecular weight distribution and lower melt strength. The broader distribution improves injection-moulding flow path and gate-vestige control, but narrow-MWD metallocene grades may offer better stiffness-toughness balance at lower density and lower volatiles. The selection between MG9621S and a metallocene grade therefore depends on the closure ESCR requirement, colour space, and organoleptic threshold.
On a high-speed closure production line, MG9621S is typically processed on all-electric or servo-hydraulic injection-moulding machines with clamp forces from 600 kN to 3500 kN, depending on the number of cavities and projected area. Hot-runner systems with valve-gate nozzles are preferred because the rapid crystallisation rate of the resin can freeze sprues and cold-runner gates in thin-wall articles. The screw should provide a compression ratio of 2.5:1 to 3.0:1 and a metering zone with a barrier flight to ensure complete melting without excessive shear heating. Melt temperatures between 220°C and 240°C are commonly used; lower temperatures reduce degradation but require higher injection pressure, while higher temperatures reduce pressure loss but may generate odour and taste carry-over. Mould temperature is controlled between 10°C and 40°C; the lower end shortens cycle time, and the upper end improves weld-line strength and surface reproduction. Holding pressure is set at 50–80 MPa hydraulic pressure, with transfer by screw position rather than time to minimise cavity-to-cavity mass variation. In 24- to 96-cavity closure tools, cavity weight variation is influenced by melt-pressure stability in the hot runner; using a melt-pressure sensor and closed-loop transfer at a set pressure of 80–120 MPa has been documented in equivalent closure grades to hold weight variation below ±0.3%. Pre-drying is not required when the granules are stored above 10°C and below 60% relative humidity.
Detergent and household-chemical closures experience hoop stress from torque retention and internal pressure, combined with exposure to surfactants, emulsifiers, and incompatible oils. Under these conditions, failure is usually initiated at knit lines, gate vestiges, or sharp internal corners. The high-molecular-mass fraction in MG9621S increases the time to brittle transition by enhancing the density of tie chains that bridge interlamellar amorphous regions. This mechanism is evaluated by notched constant-load tests according to ISO 16770:2019 or by the older notched constant-strain test under ASTM D1693. In injection-moulded articles, the ESCR performance of the resin is not transferred directly from compression-moulded test plaques; weld lines and frozen-in moulded-in stress must be incorporated in the validation programme. Loading of 3.0 MPa at 50°C in 2% nonylphenol ethoxylate is a typical reference condition for detergent closure screening, but the actual end-use environment may include solvents, terpenes, or bleach, which can shift the stress-cracking response. No HDPE grade is immune to stress cracking in all chemical environments; compatibility testing of the actual filled formulation and closure geometry is required. Published data for this specific configuration is limited, particularly for coloured or masterbatched versions, because pigments and processing aids can alter crystallinity and amorphous-phase mobility. When ESCR is the dominant requirement, MG9621S is selected over standard injection-moulding HDPE grades of the same density because the bimodal comonomer placement preserves slow crack growth resistance without reducing melt flow rate to blow-moulding levels.
According to supplier product stewardship documentation, MG9621S is suitable for food-contact applications when the final article meets the overall and specific migration limits of EU Regulation (EU) No 10/2011 and its amendments. In the United States, the base resin is represented as satisfying the compositional requirements of 21 CFR 177.1520 for olefin polymers, with the caveat that the final closure must be tested for extractables and organoleptic transfer under the intended filling and storage conditions. The grade is registered under Regulation (EC) No 1907/2006 (REACH) in the relevant tonnage band. Heavy-metal limits for packaging under Directive 94/62/EC are declared on request; the resin is not formulated with cadmium, lead, mercury, or hexavalent chromium. For electronic packaging and food-contact housings, verification against RoHS Directive 2011/65/EU is limited to the absence of intentionally added PBB, PBDE, and the four restricted metals. Antioxidant and processing stabiliser packages are present at parts-per-million concentrations; these additives can migrate and should be accounted for in migration modelling according to Article 19 of (EU) No 10/2011 when the packaging is intended for fatty or alcoholic foods.
| Requirement | Scope | Reference |
|---|---|---|
| EU food-contact plastics | Overall and specific migration | (EU) No 10/2011 |
| US food-contact olefin polymer | Compositional compliance | 21 CFR 177.1520 |
| REACH registration | Substance registration and restrictions | Regulation (EC) No 1907/2006 |
| Packaging heavy metals | Cd, Pb, Hg, Cr(VI) concentration sum | Directive 94/62/EC |
| RoHS | PBB, PBDE, Cd, Pb, Hg, Cr(VI) | Directive 2011/65/EU |
MG9621S should be stored in closed silos or octabins at temperatures below 30°C and relative humidity below 60%. At higher humidity, surface condensation during cold-to-warm transfer can cause splay and degrade visual quality in unpigmented closures. If condensation is suspected, pre-drying for 2–4 h at 80°C with a dehumidified-air dryer is applied. The resin should not be processed above 250°C melt temperature, because prolonged residence times at high temperature accelerate chain scission, discoloration, and generation of low-molecular-mass oxidation products. The grade is incompatible with strong oxidising agents, such as concentrated nitric acid or hydrogen peroxide, at melt-processing temperatures; contact with mineral acids above 60°C may initiate oxidative surface pitting. Chlorinated solvents and aromatic hydrocarbons can swell the amorphous phase and reduce ESCR in service, so closure testing with the actual container contents is mandatory. Masterbatches containing unsaturated hydrocarbon softeners or certain amine-based antistatic packages may alter oxidative induction time; their effect on stabiliser consumption should be evaluated by oxidation induction time testing under ISO 11357-6 before production approval. The natural grade contains only processing antioxidant and is not recommended for long-term outdoor exposure without additional UV stabilisation.
