| HS Code | 586091 |
| Melt Flow Rate 190 C 2 16kg | 2.0 g/10min |
| Density | 0.922 g/cm³ |
| Comonomer | Butene-1 |
| Tensile Yield Strength | 11 MPa |
| Tensile Break Strength | 17 MPa |
| Elongation At Break | 700% |
| Flexural Modulus | 380 MPa |
| Vicat Softening Temperature | 105 °C |
| Melting Point | 124 °C |
| Brittleness Temperature | -80 °C |
| Shore D Hardness | 55 |
| Molecular Weight Distribution | Narrow |
As an accredited Shanghai SECCO LLDPE LL0220AA factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Shanghai SECCO LLDPE LL0220AA is supplied in 25 kg sealed bags, as free-flowing polyethylene pellets for safe handling and storage. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): 20-foot full container load of Shanghai SECCO LLDPE LL0220AA, packed in 25 kg bags on pallets, shrink-wrapped and secured. |
| Shipping | Shanghai SECCO LLDPE LL0220AA is a non-hazardous thermoplastic resin shipped in 25 kg bags, octabins, or bulk containers. Protect from moisture, direct heat, and physical damage during transit. Use clean, dry containers or hopper trucks, and secure loads properly. Standard labeling and handling procedures for plastic pellets apply. |
| Storage | Store Shanghai SECCO LLDPE LL0220AA in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep the original sealed packaging to prevent moisture absorption and contamination. Avoid stacking excessively high to prevent deformation. No special hazardous storage requirements apply; maintain good housekeeping and handle with care to prevent pellet spillage. |
| Shelf Life | Shelf life is 12 months from manufacture if stored in original, unopened packaging in a cool, dry place. |
Heavy-duty shipping sack manufacturing with Shanghai SECCO LLDPE LL0220AA begins from the grade’s melt flow rate of 2.0 g/10 min measured under ISO 1133-1:2022 and nominal density of 0.920 g/cm³ under ISO 1183-1:2019; these values define a butene-based LLDPE with sufficient dart impact retention for industrial bag structures when extruded on blown film lines using 25:1–30:1 L/D single-screw extruders, die gap 2.0–2.5 mm, die diameter 200–350 mm, blow-up ratio 2.0:1–2.5:1, and melt temperature 185–210 °C. Compliance testing for heavy-duty sack film is anchored to ISO 527-3:2018 for tensile strength and elongation and ISO 7765-1:2004 for free-falling dart impact; film classified as food-contact FIBC liner or chemical sack inner liner is also assessed under FDA 21 CFR 177.1520(c) and EU 10/2011 where migration limits apply. The formulation addition ratio on commercial lines typically meters LL0220AA at 70–85 wt% with a low-melt-index LDPE partner at 15–30 wt% to raise melt strength and stabilise the bubble; a combined slip/antiblock masterbatch based on erucamide at 5 wt% and synthetic silica at 10 wt% is dosed at 1.5–3.0 wt% of total compound, while carbon black or titanium dioxide colour masterbatch may replace 2–4 wt% of the polymer fraction for opacity. Downstream production on high-output blown film lines uses barrier screws with mixing pins, dual-lip air rings and internal bubble cooling when gauge uniformity below ±5% is required; the frost line is held at 6–8 die diameters to avoid the bubble instability that appears above blow-up ratio 2.8:1 in butene-based LLDPE, and operators on 30:1 L/D extruders observe that high melt pressure at the screen pack raises melt temperature at the screw tip, so screen changes are scheduled before pressure exceeds 450 bar. Terminal finished product types include heavy-duty shipping sacks, valve bags for plastic resin, FIBC liners, fertiliser and chemical powder bags, and industrial refuse containers where puncture resistance is controlled by ASTM D1922 Elmendorf tear and ASTM D1709 dart impact retention.
In silage bag and mulch film operations, LL0220AA is introduced through the main feed throat with the polymer fraction set at 75–85 wt% LL0220AA and 15–25 wt% LDPE, while a UV stabiliser masterbatch is added at 3–6 wt% of total compound; the masterbatch typically contains hindered amine light stabilisers at 0.3–0.5 wt% active content in the final film, and carbon black at 2–4 wt% when UV-blocking silage covers are produced. Compliance for agricultural thermoplastic films is evaluated under EN 13206:2017; tear retention is measured by ASTM D1922, while tensile properties follow ISO 527-3:2018 and impact resistance is screened by ISO 7765-1:2004. The downstream production process uses blown film towers with 2.4–2.8 mm die gaps, blow-up ratios of 2.8:1–3.2:1, and melt temperatures of 190–210 °C; internal bubble cooling is required for large-diameter bubbles because butene-based LL0220AA has lower melt strength than hexene or octene grades, and bubble instability at high BUR appears as visible gauge bands if the frost line is not maintained above 7 die diameters. Operational boundaries include no pre-drying below 60% relative humidity; surface condensation from outdoor storage in humid regions must be removed by hot-air drying at 70 °C for 2 h before extrusion to prevent surface moisture-induced pinholes, while contact with strong oxidisers and halogenated solvents must be avoided because they degrade the polyethylene surface and reduce mechanical integrity. Terminal finished product types are silage bags, silage clamp covers, greenhouse side sheets, lightweight mulch film, and ensiling tubes.
Refuse liner extrusion, a cost-driven segment, uses LL0220AA at 30–50 wt% as a dart-impact and tear-strength modifier in blends with low-cost LDPE or post-consumer recyclate at 50–70 wt%, with carbon black masterbatch at 2–4 wt% of total compound, and the resulting film is tested under EN 13592:2017 for household waste sacks and ASTM D1709 for dart impact; production occurs on high-stalk blown film lines with 2:1–2.5:1 blow-up ratios, 1.8–2.2 mm die gaps, and melt temperatures of 160–190 °C, where the lower melt temperature reduces gel formation when recycled content carries residual catalytic metals, and terminal finished product types include household refuse sacks, bin liners, and lightweight industrial waste bags.
At cast film line speeds above 300 m/min, the butene-derived molecular structure of LL0220AA shows lower resistance to draw resonance than hexene or octene LLDPE, and line speed is therefore often capped near 400–500 m/min unless an octene metallocene LLDPE is incorporated. For machine-grade stretch film, the addition ratio is LL0220AA at 80–90 wt%, metallocene LLDPE or plastomer at 10–20 wt%, and polyisobutylene tackifier at 0.5–1.5 wt%; slip and antiblock additives are omitted or kept below 0.1 wt% because they suppress cling force. Compliance testing uses ASTM D5458 for peel cling, ASTM D5459 for machine-direction elastic recovery and permanent deformation, and ASTM D5748 for protrusion puncture resistance. The downstream process is cast film extrusion through a 0.5–0.8 mm flat die onto a polished chill roll held at 20–30 °C, with melt temperature 240–260 °C and multi-layer feedblock construction; edge trim is recycled into the core layer up to 15 wt% without loss of optical quality. Additive bloom is a known production issue: tackifier migration to the chill roll increases with roll temperature above 30 °C, and blocking on the winder is reduced by lowering winding tension to 120–180 N/m and using an oscillating lay-on roll. Terminal finished product types include hand stretch film, machine stretch film, power pre-stretch film, and agricultural bale silage wrap.
High-speed extrusion lamination subjects LL0220AA to a narrow processing window because the grade’s 2.0 g/10 min melt flow rate permits draw-down onto paper and aluminium foil but requires LDPE dilution to control neck-in and edge curl at line speeds above 200 m/min. The formulation addition ratio is 85–95 wt% LL0220AA with 5–15 wt% LDPE at 0.3–0.7 g/10 min melt flow rate, and no slip additive is used in the sealant layer when immediate secondary lamination is required; for low-seal-initiation-temperature flexible packaging, a hot-tack-promoting masterbatch may be added at 1–2 wt%. Compliance for food contact is based on FDA 21 CFR 177.1520(c), EU 10/2011 overall migration limits, and GB 9685-2016 where applicable; film adhesion to primary substrates is tested by ASTM F904 for bond strength in flexible laminates. The production process uses a 90 mm single-screw extruder with a barrier screw, melt temperature 280–310 °C, die gap 0.5–0.8 mm, air gap 150–250 mm, and coat weight 15–30 g/m²; residence time is kept below 15 min because polyethylene thermal degradation above 300 °C generates gel particles that appear as fish-eye defects in laminates. Incompatibilities include halogenated cleaning solvents and strong oxidisers, which degrade the polyethylene surface and reduce adhesion; corona treatment to 38–42 mN/m is used when the sealant layer is later printed or metallised. Terminal finished product types are laminated pouches, stand-up pouch inner sealants, lidding films for dairy cups, and paper/foil/PE sachets.
For frozen food packaging, seal initiation and cold-temperature impact retention determine the addition ratio: LL0220AA is blended at 65–80 wt% with LDPE at 20–35 wt% and a slip/antiblock masterbatch at 0.5–1.5 wt% of total compound, with final film gauges of 40–70 μm. Compliance follows FDA 21 CFR 177.1520(c) and EU 10/2011, while dart impact and tear resistance are screened by ASTM D1709 and ASTM D1922; published data for this specific configuration at -20 °C is limited, so low-temperature performance should be confirmed on the actual film line. Downstream production uses blown film with 2.0:1–2.5:1 blow-up ratio, 2.0–2.4 mm die gap, and melt temperature 180–200 °C. Terminal finished product types are frozen vegetable bags, ice cream wrapper film, frozen seafood pouches, and frozen ready-meal lidding.
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Shanghai SECCO LLDPE LL0220AA is a butene/ethylene copolymer manufactured by gas-phase fluidized-bed polymerisation on a commercial Ziegler-Natta catalyst system. The nominal melt flow rate of the pellet is 2.0 g/10 min when determined by ISO 1133-1:2022 at 190 °C under 2.16 kg, and the nominal density is 0.920 g/cm³ when determined by ISO 1183-1:2019. The material is a linear low-density polyethylene whose crystallisable backbone contains ethyl short-chain branches inserted through butene comonomer. The resulting semicrystalline solid has a density below that of high-density homopolymer and higher than most high-pressure low-density polyethylene. Film produced from this resin is used where a defined balance of stiffness, dart impact, seal initiation, and drawdown is required without the high melt strength of LDPE. The grade is not a metallocene resin and does not possess the narrow molecular weight distribution associated with single-site catalysis; that difference affects both processing and film property development.
Base-grade formulation of LL0220AA is released with a stabilisation package sufficient for pelletisation and repeated extrusion passes, but without fixed slip or antiblock loads. Because the pellet contains no significant talc or silica surface additive, coefficient of friction and blocking behavior are controlled by downstream masterbatch addition. Haze, gloss, seal strength, and blocking force must therefore be measured on the finished film after conversion rather than inferred from pellet data. Published data for this specific configuration is limited; lot-specific values for dart impact, Elmendorf tear, and seal strength require qualification on the target film line. The product is supplied as free-flowing pellets and is not hygroscopic enough to require routine drying under normal indoor storage.
At equal density and melt flow rate, a butene-based Ziegler-Natta LLDPE generally shows lower dart impact strength and lower Elmendorf tear resistance than a hexene-based LLDPE. The ethyl branch produced by butene is shorter than the butyl branch produced by hexene and is less effective in promoting tie-molecule formation across adjacent lamellar crystals. Comparative film studies using ISO 7765-2:2022 or ASTM D1709 for dart impact and ISO 6383-2:1983 or ASTM D1922 for tear resistance show this rank order at 25 µm and 50 µm gauge. The dart impact penalty for butene grades is commonly reported as 20% to 35% relative to hexene at matched density and melt flow rate, but this is a category comparison rather than a certificate value for LL0220AA.
Tensile properties measured to ISO 527-3:2018 are less affected by comonomer type than impact and tear. Films from this resin class typically show yield stress in the low-density polyethylene range and elongation at break above 500% for clean unfilled film. The density of 0.920 g/cm³ places LL0220AA below the stiffness level of medium-density polyethylene, with secant modulus at 1% strain below that of 0.935 g/cm³ resins but above that of high-pressure LDPE. Optical properties measured by ASTM D1003 and ASTM D2457 depend on extrusion temperature, cooling air temperature, and the presence of slip or nucleating additives. A metallocene hexene grade generally provides lower haze at the same gauge and processing conditions.
Blown-film lines running LL0220AA benefit from grooved-feed extruders with L/D ≥ 25:1, barrier screws, and screen packs of 60/80/100 mesh to remove agglomerates. Melt temperature is normally maintained between 190 °C and 215 °C; lower temperatures increase melt viscosity and die pressure, while higher temperatures oxidatively stress the stabiliser package and raise gel counts. Because LL0220AA is a linear polymer, extensional viscosity of the melt is higher than that of LDPE at equal melt index, and die exits are prone to sharkskin melt fracture when the die gap is below 1.5 mm. A die gap of 1.5 mm to 2.5 mm is recommended, with a land length that limits shear stress below the critical melt fracture value. Fluoropolymer polymer processing aid at 300 ppm to 800 ppm conditions the die lip over 15 min to 45 min and reduces melt fracture, but the carrier resin must be compatible with the intended film application.
Bubble stability is governed by the low melt strength of the linear architecture. At blow-up ratios above 2.5:1 or frost-line heights below 2 die diameters, bubble chatter, thickness variation, and intermittent film break may occur on high-stalk extrusion towers. Frost-line height is typically set at 2 to 6 die diameters depending on gauge, quench air temperature, and internal bubble cooling. On cast-film lines, the melt temperature can be lowered to improve quench efficiency, but feedblock and die lip temperatures must be kept within the established temperature band to avoid local cold spots. Drying is not required for normal indoor storage; however, if pellets are exposed to relative humidity above 60% and surface condensation occurs, a dry-air purge at 60 °C to 70 °C for 2 h to 4 h is applied before extrusion.
On high-output blown-film towers with internal bubble cooling and automatic gauge control, LL0220AA can be taken below 20 µm, but dart impact becomes strongly gauge-dependent. Reducing film gauge from 50 µm to 25 µm changes impact energy in a nonlinear manner because energy dissipation across the film thickness is reduced. Dart impact to ISO 7765-2:2022 and Elmendorf tear to ISO 6383-2:1983 should be retested after gauge changes rather than assumed linear. Agricultural mulch and tunnel films use the resin at typical gauges of 15 µm to 30 µm; light stabilisers and pigments are added via masterbatch, while the base resin contributes mechanical durability during installation and service. Heavy-duty packaging and carrier bags often require blending with LDPE or high-molecular-weight HDPE to restore melt strength and tear resistance.
When LL0220AA is blended with high-pressure LDPE, long-chain branching from the LDPE phase modifies shear thinning and increases melt elasticity. Blends containing 20 wt% to 30 wt% LDPE are common for heavy-gauge film and form-fill-seal structures because the LDPE component raises bubble stability and reduces draw resonance. However, the LDPE component depresses modulus and yield stress, so tensile properties measured to ISO 527-3:2018 and tear resistance measured to ISO 6383-2:1983 should determine the blend ratio. LL0220AA is not a metallocene LLDPE; its molecular weight distribution is broader than that of a typical single-site hexene grade but not as broad as LDPE. The rheological consequence is intermediate shear thinning and moderate melt elasticity. On extrusion lines with high-shear mixing sections, energy input can raise melt temperature by 5 °C to 10 °C when LL0220AA replaces LDPE at the same throughput. Barrel zone settings should be retrimmed to avoid gel formation and to preserve stabiliser activity. Production-scale failure modes reported for this class of resin include die lip deposit on untreated dies, surging after screen packs blind, and hole formation in film below 15 µm caused by low melt strength and draw resonance.
In multilayer films, LL0220AA can be used as a sealant layer, but its butene-based Ziegler-Natta architecture typically produces a higher seal initiation temperature than a metallocene hexene LLDPE and a broader sealing window conditioned by molecular weight distribution. Heat seal testing is performed according to ASTM F2029 or ASTM F88/F88M-21, with hot tack measured to ASTM F1921. Seal strength depends on film gauge, sealing temperature, dwell time, and pressure. Converters should map seal strength over a temperature range rather than relying on a single point. For LL0220AA, published data for seal initiation is limited; therefore, line-specific heat seal curves are required. The absence of fixed slip and antiblock additives allows converter-controlled surface modification without the risk of additive migration during storage. If high hot tack is required for vertical form-fill-seal packaging, a metallocene hexene grade may outperform the butene grade.
Regulatory positioning must be verified with the supplier because the base resin and the finished film are subject to different requirements. The polyolefin base is positioned for food-contact use under FDA 21 CFR 177.1520 when used within the limitations of that section. For the European Union, overall migration and specific migration limits are assessed under Commission Regulation (EU) No 10/2011. REACH SVHC declarations for LL0220AA are based on supplier information and are not expected to exceed 0.1% w/w for any substance on the Candidate List. RoHS 2011/65/EU restrictions for lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are not relevant to the base polyolefin formulation, but converters must evaluate printed films and additive masterbatches. The following matrix addresses the primary compliance reference points.
| Regulatory reference | Condition | Verification basis |
|---|---|---|
| FDA 21 CFR 177.1520 | Food-contact olefin polymers | Supplier food-contact statement; use temperature and food type determine compliance pathway |
| EU No 10/2011 | Plastic materials and articles intended to come into contact with food | Overall migration 10 mg/dm²; specific migration limits for additives evaluated on finished film |
| REACH 1907/2006 | SVHC listing and restriction | Supplier declaration of 0.1% w/w per SVHC |
| RoHS 2011/65/EU | Packaging material in electrical and electronic equipment | Absence of restricted heavy metals and brominated flame retardants in base polyolefin |
