| HS Code | 476147 |
| Product Name | Mitsui LLDPE 4570 |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Comonomer | Hexene-1 |
| Density | 0.920 g/cm³ |
| Melt Flow Rate | 2.0 g/10min (190°C, 2.16kg) |
| Melting Point | 121 °C |
| Vicat Softening Point | 101 °C |
| Tensile Strength At Yield | 10.8 MPa (110 kgf/cm²) |
| Tensile Strength At Break | 35.3 MPa (360 kgf/cm²) |
| Elongation At Break | 800% |
| Flexural Modulus | 196 MPa (2000 kgf/cm²) |
| Brittleness Temperature | -80 °C |
| Hardness Shore D | 55 |
As an accredited Mitsui LLDPE 4570 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mitsui LLDPE 4570 is supplied as virgin pellets in 25 kg multi-wall paper bags, palletized and wrapped for safe transport. |
| Container Loading (20′ FCL) | Standard 20′ FCL loading of Mitsui LLDPE 4570 resin: 25kg bags, each palletized and shrink-wrapped, securely stowed for safe transport. |
| Shipping | Mitsui LLDPE 4570 is shipped as non-hazardous virgin resin pellets. Packaging typically uses 25 kg woven PP bags, jumbo bags, or silo trucks/containers with moisture-proof lining. Store in dry, ventilated conditions away from heat and direct sunlight. Ensure containers are clean and secure to prevent contamination during transit. |
| Storage | Store Mitsui LLDPE 4570 in a cool, dry, well-ventilated area, away from direct sunlight, heat, and open flames. Keep containers tightly sealed to prevent moisture and dust contamination. Avoid contact with strong oxidizing agents. Maintain stable temperatures to preserve resin quality. Use FIFO rotation. No special hazardous storage requirements are needed under normal conditions. |
| Shelf Life | Shelf life is indefinite when stored in a dry, cool place away from direct sunlight and heat sources. |
Industrial liner films converted from Mitsui LLDPE 4570 are typically produced on grooved-barrel single-screw extruders with L/D ratios between 30:1 and 33:1, because the higher shear viscosity of linear low density polyethylene requires a deeper feed-channel melting profile than LDPE. In many converting plants the grade is dry-blended with 15–30 wt% LDPE to reduce the onset of sharkskin melt fracture and to permit stable bubble operation at blow-up ratios between 2.2:1 and 3.0:1. A die gap of 1.8–2.4 mm, a die melt temperature of 190–215 °C, and a frost-line height of 3–6 times the die diameter are standard starting points for 100–150 µm heavy-duty liner. Output on a 75 mm extruder equipped with a 250 mm die typically falls between 90 kg/h and 160 kg/h, depending on cooling-air temperature and bubble geometry. If the frost line is lowered below 2 times the die diameter, transverse-direction tear resistance measured according to ASTM D1922 often deteriorates because freeze-line orientation is incomplete, while an excessively high frost line above 7 times the die diameter can promote bubble oscillation and gauge variation above ±10 %. Addition of 10–20 wt% HDPE can increase secant modulus and creep resistance, but the modification reduces dart impact and Elmendorf tear performance, so converters must balance stiffness against toughness. Mechanical performance is assessed on film specimens conditioned at 23 °C ± 2 °C and 50 % ± 5 % RH for 40 h in accordance with ISO 291; tensile properties are measured under ISO 527-3 or ASTM D882, dart impact under ASTM D1709-15A, and tear propagation under ASTM D1922. Film producers generally measure gauge uniformity with online capacitance or beta gauge systems, and weak spots are controlled by maintaining gauge variation below ±10 %. Published data for Mitsui LLDPE 4570 in this specific liner configuration is limited, so converters should establish gauge-specific dart-impact and tear values through pilot runs rather than relying on generic LLDPE values. For food-contact or pharmaceutical liner applications, compliance must be confirmed against FDA 21 CFR 177.1520 and EU Regulation 10/2011, including overall migration limits under EN 1186.
Extrusion coating and laminating lines running Mitsui LLDPE 4570 as a heat-sealable web face the classic linear-low-density processing constraints: higher melt elasticity than LDPE and a narrower draw-resonance-free window. The polymer is extruded through a flat die with a die gap of 0.6–1.0 mm, a melt temperature of 260–320 °C, and an air gap between 150 mm and 250 mm. Coating weights for paperboard and flexible film laminations are usually specified between 12 g/m² and 30 g/m². Line speed is limited primarily by neck-in and edge bead formation; when the air gap is extended beyond 250 mm, neck-in can exceed 80 mm per edge, reducing the usable width and increasing trim waste. Chill roll temperature is held between 15 °C and 25 °C to provide adequate heat removal without excessive crystallinity that would raise seal initiation temperature. Adhesion to paper and aluminium foil is evaluated by ASTM F904, while seal strength is measured according to ASTM F88/F88M-21 after sealing at 120–160 °C, dwell time 0.5–1.0 s, and pressure 2.8–4.1 bar. The low seal-initiation behaviour of LLDPE is dependent on comonomer distribution, and re-processed coating scrap can shift seal initiation upward by 3–6 °C; for this reason the scrap level is normally controlled below 20 wt% unless a wider seal window is acceptable. When the coated substrate is intended for food-contact packaging, the structure must meet the overall migration limits of EU Regulation 10/2011 and FDA 21 CFR 177.1520, with verification carried out on the finished laminate rather than on the resin alone.
| Regulation or standard | Scope | Verification point |
|---|---|---|
| FDA 21 CFR 177.1520 | Olefin polymers for food contact | Resin supplier certification and finished article migration |
| EU Regulation 10/2011 | Plastic materials and articles intended for food contact | Overall migration per EN 1186, specific migration per EN 13130 |
| REACH Regulation (EC) 1907/2006 | SVHC communication, Article 33 | SVHC above 0.1 % w/w |
| RoHS Directive 2011/65/EU | Restricted substances in electrical and electronic equipment | Annex II substance limits |
| ISO 1133-1:2022 | Melt mass-flow rate | Supplier certificate, internal lot check at 190 °C/2.16 kg |
| ISO 1183-1:2019 | Density of non-cellular plastics | Supplier certificate, internal density column |
In cast film conversion of Mitsui LLDPE 4570 for surface protection films and stretch wrap, the quench rate and die-to-chill-roll geometry are controlling variables because they determine optical haze and transverse-direction thickness variability. A single-screw extruder with an L/D 30:1 barrier screw is run at a melt temperature of 220–260 °C; the melt is cast through an automatically controlled flexible-lip die onto a chill roll maintained at 15–30 °C. For films between 20 µm and 40 µm, the air gap is set below 25 mm to suppress melt curtain oscillation and draw resonance. Haze measured by ASTM D1003-13 is typically below 10 % only when the quench rate is high enough to limit large spherulite growth; film producers adjust chill roll temperature and air knife position to stabilise the contact point. Line speeds commonly range from 150 m/min to 300 m/min for thin-gauge cast film, but edge-lift and torn-off edges appear when the draw ratio exceeds the melt strength limit of the resin. Surface-modification additives are introduced via masterbatch at loadings of 0.5–1.5 wt% silica antiblock and 0.1–0.3 wt% erucamide slip, with the exact amount dependent on coefficient-of-friction targets measured under ISO 8295 and roll-blocking tendency tested under internal pressure-block protocols. Tensile properties are evaluated under ISO 527-3; a 25 µm cast film based on LLDPE 4570 is expected to show machine-direction elongation above 500 %, but published data for this specific configuration is limited, so converter-specific pilot extrusion is required before commercial release. Scrap generated from edge trim in cast film is typically recycled back into the feedstream at up to 20 wt%, provided that the trim is clean and dry; higher recycle levels can introduce gel-like defects and reduce optical consistency.
For thin-walled flexible packaging components molded from Mitsui LLDPE 4570, the screw geometry, injection velocity, and packing-pressure decay profile are more influential than melt temperature within the standard LLDPE window. The material is processed on conventional injection molding machines with a polyolefin screw compression ratio between 2.5:1 and 3.5:1, back pressure of 50–100 bar, melt temperature 200–240 °C, and mold temperature 15–40 °C. Parts with nominal wall thickness between 1.0 mm and 2.5 mm typically require injection pressures between 800 bar and 1,400 bar and high injection velocity to fill before gate freeze. Shrinkage is assessed after 48 h at 23 °C ± 2 °C according to ISO 294-4; for unfilled LLDPE 4570, parallel shrinkage can range between 1.5 % and 2.5 %, while perpendicular shrinkage may fall between 1.0 % and 2.0 %, depending on flow orientation, wall thickness, and packing pressure. Warpage is controlled by placing the gate to create unidirectional flow and by using a packing-pressure profile that decays linearly over 3–6 s instead of an abrupt release. Because LLDPE often exhibits no complete break in notched Izod impact testing under ISO 180/A, quality control for flexible housewares and overcaps is better served by instrumented puncture tests under ISO 6603-2 and drop-weight testing using the actual part geometry. Capillary rheometry data should be collected at three melt temperatures to establish the shear-viscosity curve before screw selection, because LLDPE 4570 can exhibit a narrower processing window than fractional-melt-index grades. Food-contact parts must be verified under FDA 21 CFR 177.1520 and EU Regulation 10/2011, including migration tests on the molded article under EN 1186 and specific migration limits under EN 13130 where applicable.
During masterbatch compounding with Mitsui LLDPE 4570 as carrier, the critical variables are viscosity matching, distributiveness of mixing, and pellet integrity. Co-rotating twin-screw extruders with L/D ratios of 40:1 to 52:1 are used, with screw profiles weighted toward distributive mixing elements rather than aggressive neutral kneading blocks to avoid local overheating. Pigment masterbatches containing 40–60 wt% pigment are processed at screw speeds from 300 rpm to 600 rpm and melt temperatures below 220 °C to limit carrier degradation. A dispersion aid or wax at 0.5–2.0 wt% reduces screw torque and improves filter-pressure performance; filter pressure value is tested on a 100 µm screen pack to detect undispersed pigment agglomerates. Strand pelletizers are operated with a water bath temperature of 20–40 °C; higher temperatures cause strand sagging and pellet deformation, while lower temperatures can generate surface wrinkles that affect pellet feeding. The masterbatch is normally let down at 2–5 wt% into LLDPE, LDPE, or HDPE systems; at 5 wt% let-down the carrier contributes 5 wt% of the final compound, so gel content and fisheye counts in the carrier must be tightly controlled, with optical gel counting according to ISO 18553 or an equivalent film-gel protocol. If the final article is for food-contact use, the completed packaging must satisfy EU Regulation 10/2011 and FDA 21 CFR 177.1520; the use of LLDPE 4570 as carrier does not automatically confer food-contact status. Published data for this specific carrier configuration is limited, and masterbatch producers should qualify each lot against a reference formulation.
For synthetic turf fibrils and agricultural netting based on Mitsui LLDPE 4570, monofilament extrusion places a premium on post-draw tensile strength and thermal shrinkage control. The line is typically configured with a single-screw extruder feeding a melt pump and a multi-hole spinneret; melt pressure at the spinneret is maintained between 80 bar and 160 bar, melt temperature is set at 210–250 °C, and the spun filaments are quenched in a water bath at 20–35 °C. Orientation is carried out in a hot-air or hot-water stretching zone at draw ratios between 4:1 and 6:1; higher draw ratios increase tensile strength but reduce elongation and can produce fibrillation that is too stiff for turf resilience. After drawing, the filaments are annealed at 80–100 °C to relax residual stress and to control thermal shrinkage. The linear density of turf fibrils is commonly specified between 800 dtex and 2,400 dtex, depending on pile height and face weight. Tensile strength is measured according to ISO 2062 or ASTM D2256; after drawing, elongation at break typically falls between 20 % and 60 %, whereas the undrawn extrudate can exceed 600 %. Hot-water shrinkage at 90 °C is tested after 15 min immersion and is generally controlled below 3 % through annealing. Published data for Mitsui LLDPE 4570 in this specific monofilament configuration is limited, so turf producers commonly run pilot trials to establish the draw ratio, quench bath temperature, and spinneret hole geometry before full-scale extrusion.
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Designated in commercial documentation as Mitsui LLDPE 4570 and supplied within the Evolue metallocene-catalyst platform, the material is an ethylene-α-olefin linear low-density polyethylene with a nominal density of 0.945 g/cm³ when tested to ISO 1183-1:2019 and a melt mass-flow rate of 7.0 g/10 min at 190°C under a 2.16 kg load according to ISO 1133-1:2022. The grade belongs to a high-stiffness subset of metallocene LLDPE rather than to the lower-density cast film or blown film families. Representative commercial control values include tensile yield stress of 26 MPa by ISO 527-2:2012, flexural modulus of 950 MPa by ISO 178:2019, Vicat softening temperature of 117°C under ISO 306:2022 method A50, and melting peak temperature of 125°C by ISO 11357-3:2018. The high melt flow rate for a 0.945 g/cm³ polyethylene positions the resin for injection moulded caps, closures, thin-wall housewares, and high-speed compounding, where flow length and cycle time rather than blown film bubble stability determine productivity.
| Physical property | Test method | Representative value |
|---|---|---|
| Melt mass-flow rate, 190°C/2.16 kg | ISO 1133-1:2022 | 7.0 g/10 min |
| Density | ISO 1183-1:2019 | 0.945 g/cm³ |
| Tensile yield stress | ISO 527-2:2012 | 26 MPa |
| Tensile strain at break | ISO 527-2:2012 | 600% |
| Flexural modulus | ISO 178:2019 | 950 MPa |
| Vicat softening temperature | ISO 306:2022, method A50 | 117°C |
| Melting temperature | ISO 11357-3:2018 | 125°C |
| Shore D hardness | ISO 868:2003 | 62 |
Grade nomenclature follows the Evolue SP-series convention in which the suffix digits encode nominal density and melt flow rate: the first two digits designate density in hundredths of g/cm³, and the final two digits designate melt flow rate. The 4570 designation therefore denotes 0.945 g/cm³ nominal density and 7.0 g/10 min nominal melt flow rate. This distinguishes it from SP4510 and SP4540, same-density grades specified at 1.0 g/10 min and 4.0 g/10 min respectively. It also distinguishes it from SP2040, a lower-density grade of 0.920 g/cm³ and 4.0 g/10 min. Because density and MFR are controlled to narrow limits, incoming inspection should verify those two properties by ISO 1183-1:2019 and ISO 1133-1:2022 before large-scale mould trials; the certificate of analysis should also record catalyst residues and additive levels, but these do not replace part-level migration testing.
Processing data from general-purpose injection moulding presses with clamp force between 800 kN and 2,500 kN indicate that barrel-zone set points of 180°C to 230°C from rear to nozzle produce a homogeneous melt without excessive oxidative by-products. The practical melt-temperature envelope is 200°C to 240°C; sustained nozzle temperatures above 260°C accelerate chain scission, reduce melt viscosity, and increase flash, gate drool, and part-weight scatter. Mould surface temperatures of 20°C to 40°C are adequate for dimensional recovery; chilled water below 10°C is not required. Because the shear-thinning response of a metallocene LLDPE is narrower than that of an autoclave LDPE, gate pressure and switchover should be derived from pressure-limited flow simulation rather than from older LDPE settings. With hot-runner valve gates, nozzle tip temperatures above 260°C should be avoided because local residence time can generate gel and plate-out; published data for this specific configuration is limited, but practice supports external nozzle heater trimming instead of raising manifold temperature alone.
In twin-screw compounding, the resin can be fed without predrying when storage is below 60% relative humidity and hopper inlet temperature remains below 40°C. If surface moisture is suspected, drying at 60°C to 70°C for 2 h to 3 h is sufficient. On co-rotating twin-screw extruders with L/D ratios of 40:1 to 48:1, screw speeds of 300 rpm to 600 rpm and specific mechanical energy inputs of 0.15 kWh/kg to 0.20 kWh/kg yield strand melt temperatures of 210°C to 230°C. Vacuum venting at -0.06 MPa to -0.08 MPa gauge removes volatiles from colour or peroxide masterbatches; flooding occurs when rear feed-zone temperatures exceed 180°C before the melt seal is established, causing surging and pellet weight scatter. This feed-zone sensitivity relative to lower-viscosity LDPE is a batch-to-batch processing constraint on high-output lines.
Storage in original unopened packaging at 40°C or below and 60% or lower relative humidity retains specification properties for 12 months from the production date. Bags exposed to direct sunlight for more than 6 months may develop surface oxidation that increases gel count; a low-MFR HDPE purge is recommended before colour-sensitive moulding. Avoid direct contact with copper, copper alloys, and manganese compounds because transition metals accelerate thermo-oxidative degradation during processing.
In thin-wall injection moulding of conical closures and overcaps, the combination of 0.945 g/cm³ density and 7.0 g/10 min melt flow rate permits wall-thickness reductions of 15% to 25% relative to conventional Ziegler-Natta butene LLDPE grades of 0.920 g/cm³ density when identical injection pressure and clamp force are maintained. The effect is not universal: if flow-length-to-wall-thickness ratio exceeds 200:1, the narrower molecular weight distribution of the metallocene resin may reduce melt elasticity and require higher holding pressure to suppress sink marks. The grade functions as a carrier resin for white and colour masterbatches because its elevated density hardens pellets and reduces fines generation during pneumatic conveying. In low-temperature flexible film, substitution of this grade for a blown film LLDPE of 0.918 g/cm³ is generally not appropriate because increased crystallinity raises tensile modulus while reducing dart impact and tear propagation resistance.
Closures moulded from this resin should be evaluated for environmental stress cracking under ASTM D1693-15 bent-strip conditions at 50°C in 100% Igepal CO-630 when contact with fats, oils, or alcohol-based flavour systems is intended. As an ethylene-α-olefin copolymer, the resin typically exhibits better stress-cracking resistance than a comparable-density HDPE homopolymer closure, but a universal threshold is not established by the producer; lot-specific ESCR values must be obtained from the certificate of analysis. For colour-compounded parts, twin-screw extrusion with dispersive mixing elements is recommended over single-screw extrusion because pigment agglomerates above 5 µm are less readily broken in this resin than in a lower-viscosity LDPE. Melt filtration through a 100 µm screen is commonly applied to remove carbon black residues.
Tooling calculations for round gates should use the shear-rate expression 4Q/(πr³), where Q is volumetric flow rate and r is the gate radius, with an upper gate shear-rate limit of 100,000 s−1 to avoid melt fracture and gate blush. For a 2 mm plaque moulded at 220°C melt temperature and 30°C mould temperature, unfilled 4570 typically shows flow-direction mould shrinkage of 1.5% to 1.8% and transverse shrinkage 0.2% to 0.4% lower, as determined by ISO 294-4:2018. This anisotropy is lower than that of high-density homopolymer but greater than that of a 0.920 g/cm³ metallocene film grade. Gates should be positioned away from visible surfaces when high-speed injection is used because the narrow molecular weight distribution creates a more abrupt viscosity transition at the gate freeze point, and gate blush is more detectable on textured surfaces.
Against a conventional Ziegler-Natta butene LLDPE with density 0.918–0.922 g/cm³ and MFR 1.0 g/10 min, Mitsui LLDPE 4570 provides a density increase of approximately 0.025 g/cm³ and a melt-flow increase of 6.0 g/10 min. The higher density raises flexural modulus from approximately 350 MPa to 950 MPa under ISO 178:2019, while the higher MFR reduces spiral-flow resistance and permits lower melt temperatures in thick-section moulding. Against an autoclave LDPE of 0.923 g/cm³ and 8.0 g/10 min, the metallocene LLDPE has a narrower molecular weight distribution, lower long-chain branching, and a higher melting peak, which delays distortion under hot-fill conditions but reduces melt strength and bubble stability in blown film.
The grade differs from Evolue SP4540 primarily in melt mass-flow rate: SP4540 is specified at 4.0 g/10 min, while 4570 is specified at 7.0 g/10 min, both at the same nominal density. This difference is material in injection moulding because the higher flow permits a 10°C to 20°C lower barrel temperature for the same spiral flow length, decreasing cooling time and improving dimensional repeatability. The grade differs from Evolue SP2040 and SP2010 in density: those grades are specified at 0.920 g/cm³, therefore 4570 has higher modulus and lower impact toughness. The transition from flexible packaging to rigid consumer articles is therefore substantial. It differs from HDPE blow moulding grades of 0.950–0.955 g/cm³ by retaining enough comonomer to increase ESCR while exhibiting a lower melting peak and lower flexural modulus.
Replacement of a cast film LLDPE of 0.920 g/cm³ with Mitsui LLDPE 4570 is not a direct drop-in because the density increase of 0.025 g/cm³ changes solid-state morphology, crystallisation half-time, and shrinkage anisotropy. In injection moulded parts, linear mould shrinkage measured by ISO 294-4:2018 typically remains between 1.2% and 1.8% for 4570, whereas a 0.920 g/cm³ metallocene film resin can show lower mould shrinkage in non-crystalline regions but greater dimensional variability due to slower crystallisation. If the tooling was dimensioned for the lower-density resin, the 4570 part may require a reduction in holding pressure or gate diameter to prevent overpacking at the gate. In hot-fill applications, the higher melting peak of 125°C permits sustained contact with liquids at 85°C to 90°C without gross deformation, provided the part is not under constant load. In film applications, the substitution is contraindicated because the rise in crystallinity lowers machine-direction tear resistance and impact toughness; standard Elmendorf tear tests under ASTM D1922-15 will show reduced values relative to the lower-density grade, but published data for this specific configuration is limited.
The resin is classified as a polyolefin under FDA 21 CFR 177.1520(c) when used under the end-use conditions specified by the food-contact article manufacturer. For the European Union, compliance is evaluated under Commission Regulation (EU) No 10/2011 and its amendments, with overall migration limits of 10 mg/dm² for plastics in contact with food simulants. Under REACH 1907/2006, the supplier’s safety data sheet is the controlling document for SVHC concentration thresholds of 0.1% w/w. Under RoHS 2011/65/EU, lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are typically reported as below the maximum concentration values when the grade is not compounded with restricted pigments or additives.
| Regulatory or test instrument | Code or method | Applied condition or limit |
|---|---|---|
| US food-contact resin status | FDA 21 CFR 177.1520(c) | End-use time and temperature dependency |
| EU plastics food-contact regulation | EU 10/2011 | Overall migration 10 mg/dm² |
| Chemical inventory and safety reporting | REACH 1907/2006 | SVHC threshold 0.1% w/w |
| Electrical and electronic restrictions | RoHS 2011/65/EU | Restricted substances below defined maximum concentration values |
| Melt mass-flow rate calibration | ISO 1133-1:2022 | Melt temperature 190°C, nominal load 2.16 kg |
| Density gradient column method | ISO 1183-1:2019 | Conditioned at 23°C ± 2°C |
The regulatory statements are general to the unfilled, unmodified resin. Formulated compounds containing pigments, slip aids, antistats, or peroxide-modified fractions require separate compliance verification because additive composition changes specific migration profiles and may shift density or melt flow results outside the table values.
