| HS Code | 642107 |
| Density | 0.913 g/cm³ (ASTM D792) |
| Melt Index | 1.0 g/10 min (ASTM D1238, 190°C/2.16 kg) |
| Melt Flow Ratio | 7.8 (I10/I2, ASTM D1238) |
| Melting Point | 122 °C (DSC) |
| Crystallization Temperature | 105 °C (DSC) |
| Tensile Strength At Break Md | 57 MPa (ASTM D882) |
| Tensile Strength At Break Td | 48 MPa (ASTM D882) |
| Elongation At Break Md | 430% (ASTM D882) |
| Elongation At Break Td | 760% (ASTM D882) |
| Secant Modulus 1pct Md | 170 MPa (ASTM D882) |
| Secant Modulus 1pct Td | 190 MPa (ASTM D882) |
| Dart Drop Impact | 950 g (ASTM D1709, F50, 1 mil film) |
| Elmendorf Tear Md | 300 g (ASTM D1922, 1 mil film) |
| Elmendorf Tear Td | 650 g (ASTM D1922, 1 mil film) |
| Haze | 8% (ASTM D1003, 1 mil film) |
| Gloss 45 Deg | 70 (ASTM D2457, 1 mil film) |
As an accredited Dow ELITE LLDPE 5220G factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Dow ELITE LLDPE 5220G is supplied as free-flowing pellets in 25 kg multi-wall paper bags, palletized and shrink-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL loaded with Dow ELITE LLDPE 5220G in 25 kg bags, palletized, stretch-wrapped, and secured for safe transport. |
| Shipping | Dow ELITE LLDPE 5220G ships as dry, free-flowing pellets in moisture-protective bags, gaylord boxes, or bulk railcars/trucks. Keep stored in a cool, dry area away from heat, ignition sources, and direct sunlight. Use proper dust control and personal protective equipment during handling to minimize exposure. |
| Storage | Store Dow ELITE LLDPE 5220G resin pellets in a clean, dry, well-ventilated area away from direct sunlight, heat sources, and moisture. Keep containers tightly sealed to prevent contamination. Recommended storage temperature is below 50°C. Avoid prolonged outdoor exposure and stacking near ignition sources. Use within one year for optimal performance. |
| Shelf Life | Shelf life is indefinite when stored in a dry, cool place away from direct sunlight and heat sources. |
On high-output three-layer blown film lines producing industrial liners and heavy-duty shipping sacks, Dow ELITE 5220G is introduced into the core layer at a weight fraction between 70 wt% and 80 wt%; the skin layers are run from high-pressure LDPE with a melt index between 0.3 g/10 min and 0.5 g/10 min to stabilise the bubble at blow-up ratios from 2.2:1 to 2.8:1. The resin contributes a nominal melt index of 3.5 g/10 min under ASTM D1238 and a density of 0.916 g/cm³ under ASTM D792, placing the formulation in the low-density toughness segment rather than the higher-modulus MDPE segment used for rigid sacks. On a 90 mm extruder with a 30:1 L/D barrier screw, melt temperature is maintained between 193°C and 210°C; screen packs of 100–150 µm are fitted to limit visual gels, and die gaps are set at 1.8–2.4 mm. The main production bottleneck occurs at high output: above 280 kg/h, bubble instability at the frost line produces gauge-band variation exceeding ±5%, which reduces dart impact consistency. Edge-trim reintroduction above 35 wt% of the core layer depresses dart impact under ASTM D1709-16a Method A below the qualification threshold for 80 µm film, because the shear history of the recycled fraction shifts the molecular weight distribution toward the low-molecular-weight tail. Chemical regrind, especially calcium carbonate filler from demolished bags, is not compatible with this film without triple-layer allocation and screen filtration at 50 µm. Package validation includes vertical drop impact following ISO 7965-2, tear propagation under ASTM D1922-15, and puncture resistance screened by protrusion puncture. When the liner is intended for incidental food contact in bag-in-box formats, the applicable clearance is 21 CFR 177.1520 in the United States and EU Regulation 10/2011 in the European Union; industrial liner documentation typically requires REACH SVHC screening at 0.1 wt% and heavy-metal confirmation under heavy-metal packaging directives. Terminal products include FIBC inner liners, valve sacks for polymer granulate, and demolition rubble bags.
In silage cover and bale wrap constructions, the core layer formulation consists of 80–90 wt% ELITE 5220G with the balance being a branched LDPE selected for melt strength; the cling skin layers contain 5–12 wt% ethylene-vinyl acetate copolymer, while hindered amine light stabilisers are added at 0.3–0.8 wt% and a UV absorber at 0.1–0.3 wt%. Total stabiliser concentrations above 1.2 wt% produce die-lip plate-out that transfers to the film as longitudinal scoring, so separate masterbatches are metered rather than pre-compounded. On a three-layer line with 80 mm extruders and a 2,400 mm die, the frost line height is held between 2.0 and 4.0 die diameters; below this window, transverse-direction orientation is insufficient and the film exhibits low slitting resistance, while above it the bubble becomes non-axisymmetric and causes gauge variance outside ±5%. Melt temperatures are maintained from 195°C to 215°C, and blow-up ratios are typically 2.0:1 to 2.6:1. Agricultural compliance is assessed under EN 13207, with tensile properties measured according to ISO 527-3 and tear resistance under ASTM D1922-15. Terminal products include bunker silage cover film from 100 µm to 150 µm, round bale wrap at 25–40 µm, and tubular silage bags for horizontal bagging machines.
Vertical form-fill-seal conversion of frozen vegetable and cereal liner films subjects the sealant layer to a narrow thermal window that favours ELITE 5220G at 90–100 wt% of the layer formulation, with 0–10 wt% high-pressure LDPE when hot-tack must be increased. Slip and anti-block additives are kept within 0.05–0.12 wt% erucamide and 0.08–0.20 wt% synthetic silica; higher migration to the seal interface can reduce seal strength after 6 weeks of warehouse storage. The film is extruded at 35–70 µm gauge, then converted on vertical form-fill-seal equipment with seal jaw temperatures between 115°C and 130°C, dwell times between 0.6 s and 1.2 s, and jaw pressures of 2.0–3.5 N/mm². The critical failure mode is hot-tack fade rather than seal initiation: when line speed exceeds 120 pouches/min, dwell time is too short for the molten layer to develop cohesive strength, and the filled-product momentum opens the seal. Food-contact compliance is documented under 21 CFR 177.1520 for the U.S., EU Regulation 10/2011 with an overall migration limit of 10 mg/dm², and GB 9685-2016 for China. Finished pouches include frozen vegetable bags, cereal liners, and snack pillow packs.
| Regulation | Clause or method | Acceptance parameter |
|---|---|---|
| 21 CFR 177.1520 | Olefin polymer clearance, use conditions A through E | No premarket clearance outside listed use; extractables vary by food type |
| EU Regulation 10/2011 | Overall migration test, food simulant A/B/D2 | Overall migration ≤ 10 mg/dm² |
| GB 9685-2016 | Positive list for additives and resins | Additive-specific maximum usage levels |
| REACH 1907/2006 | SVHC screening | No SVHC above 0.1 wt% per article |
Adhesive lamination of metallized PET or BOPP print webs to a polyolefin sealant layer imposes a different set of constraints: the ELITE 5220G sealant film is extrusion-blown at 30–60 µm gauge, corona-treated to 38–42 mN/m, and laminated at line speeds between 200 m/min and 350 m/min with a solventless polyurethane adhesive applied at 1.5–2.0 g/m². Formulation is typically 85–100 wt% ELITE 5220G; adding 10–15 wt% LDPE increases the entanglement plateau during drawdown and reduces neck-in at the lamination nip, but raises the heat-seal initiation temperature by approximately 3–5°C. The main production line failure is not tensile failure but poor wetting of the sealant web after storage: films held longer than 3 months at ambient humidity exhibit corona decay below 36 mN/m, and the adhesive forms fish-eye defects in the peel test. Seal strength is evaluated under ASTM F88/F88M at jaw separation speeds of 200–300 mm/min. Compliance for finished pouch structures follows EU Regulation 10/2011; for the U.S. food market, the sealant resin falls under 21 CFR 177.1520. Incoming resin release testing includes melt index per ASTM D1238-20 and density per ASTM D792-20. Terminal structures include stand-up pouches for dry beverage mixes, granola pouches, and liquid detergent refill pouches.
At storage temperatures between −25°C and −18°C, the frozen seafood pack is exposed to repeated flexing, sharp shell edges, and drop impacts; the film layer is formulated with 85–95 wt% ELITE 5220G and 5–15 wt% LDPE, with anti-block and slip packages held at the lower end to avoid fissures that become crack-initiation sites during ice-glaze crushing. The film is blown at 50–90 µm, converted on VFFS machines with nitrogen flush, and sealed at 115–130°C using dwell times of 0.6–1.2 s; after filling, packs are blast-frozen at −35°C for 4–8 h before distribution. Film performance at sub-zero temperatures is measured under ASTM D882 with specimens conditioned at −20°C, and flex crack resistance is screened using ASTM F392 with 5 flex cycles; published values for this exact configuration vary with gauge and laboratory conditioning, so end-of-line filled-pack drop tests are required for each new film lot. Food-contact requirements are covered by 21 CFR 177.1520 and EU Regulation 10/2011, with particular attention to additive migration from slip agents under frozen storage. Terminal products include ice-glazed shrimp bags, seafood pouches, and poultry bags for cold-chain distribution.
Below-slab vapour barrier film produced from ELITE 5220G is extruded as monolayer at thicknesses between 250 µm and 400 µm; the resin is processed at 100 wt% or with 0.5–1.0 wt% carbon black masterbatch where the film is exposed to UV during construction staging. A 150 mm annular die with a die gap of 2.4 mm and a blow-up ratio between 1.8:1 and 2.2:1 maintains flat width and minimises gauge variation; melt temperatures are held between 195°C and 215°C, and heavy-gauge bubble cooling requires high-volume internal bubble cooling to prevent blocking. The key property is not water vapor permeance alone but puncture resistance during backfill placement; qualification includes dart impact under ASTM D1709-16a Method A and puncture resistance testing under ASTM D5748-19. Compliance is stated under ASTM E1745 for water vapor retarders, and for European projects EN 13967 may be cited where the membrane forms part of the below-ground damp-proofing system. The resin's Vicat softening point near 105°C under ASTM D1525 defines an operational boundary: the film is not compatible with direct hot-bitumen application or sustained contact with steam-cleaning equipment above 90°C. Terminal products include under-slab vapor barriers, crawl space liners, and foundation protection membranes.
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Dow ELITE LLDPE 5220G is a linear low-density polyethylene produced in a solution process using single-site catalyst technology. The product is built on an ethylene-octene copolymer backbone, which distinguishes it from butene-based linear low-density polyethylene grades produced with conventional Ziegler-Natta catalyst systems. The nominal melt index is 3.5 g/10 min determined at 190°C under 2.16 kg load per ASTM D1238, and the nominal density is 0.916 g/cm³ per ASTM D792. These values are typical design values and are not release limits; the certificate of analysis for each lot provides the controlling specification. Intended use is primarily blown film for flexible packaging, laminated structures, and sealant layers where a balance of low seal initiation temperature, puncture resistance, and optical clarity is required. The resin is supplied in pellet form with a stabilizing additive package. End users should confirm additive type and level if surface coefficient of friction, blocking, or seal performance is critical for the final structure.
The resin identity and lot acceptance are typically evaluated through melt index, density, and visual pellet inspection. A density of 0.916 g/cm³ corresponds to a moderately low crystallinity, which reduces the heat-seal initiation temperature relative to linear low-density polyethylene grades with density above 0.920 g/cm³. The melt index of 3.5 g/10 min is relatively high for blown film and predicts lower extruder head pressure than a 1.0 g/10 min grade; it also limits bubble stability at very high blow-up ratios unless cooling air and frost line height are adjusted.
| Property | Typical value | Test method |
|---|---|---|
| Nominal melt index | 3.5 g/10 min | ASTM D1238 |
| Nominal density | 0.916 g/cm³ | ASTM D792 |
| Comonomer | Octene-1 | Internal chromatographic analysis |
| Form | Pellets | Visual |
| Stabilization | Antioxidant package | Supplier formulation |
The octene-1 comonomer produces longer short-chain branches than butene-derived branches, which influences solid-state deformation behavior and seal response. Because the grade is not a high-pressure low-density polyethylene, it does not contain the long-chain branching that contributes high melt strength to autoclave or tubular LDPE. This structural difference has direct consequences for extrusion and bubble management.
On a typical monolayer blown-film line built around a 75 mm single-screw extruder with 24:1 L/D and a barrier screw with a Maddock mixing section, Dow ELITE LLDPE 5220G is usually processed with barrel zone settings rising from approximately 150°C in the feed zone to 215°C at the adapter, yielding melt temperatures in the 204–232°C band. Die gap is commonly set between 1.8 mm and 2.5 mm, and the blow-up ratio is maintained at 2.2–2.8 for balanced orientation. A frost line height of 6–10 die diameters is typical for this density and melt index class. Lower die gaps increase shear stress and may initiate sharkskin melt fracture; higher die gaps improve melt fracture resistance but decrease film cooling and may reduce optical quality. Bubble stability is sensitive to air ring configuration, exhaust ventilation, and ambient air turbulence. When a high-stalk bubble is used, the comparatively low melt strength associated with a 3.5 g/10 min melt index may require a reduction in die temperature to 200–210°C and an increase in frost line height to maintain neck geometry.
| Process parameter | Starting range | Unit |
|---|---|---|
| Feed zone barrel temperature | 150–170 | °C |
| Compression zone barrel temperature | 175–190 | °C |
| Adapter temperature | 200–215 | °C |
| Die temperature | 205–220 | °C |
| Melt temperature | 204–232 | °C |
| Die gap | 1.8–2.5 | mm |
| Blow-up ratio | 2.2–2.8 | Dimensionless |
| Frost line height | 6–10 | Die diameters |
These settings are starting points rather than universal release values. Screw speed, die diameter, air ring age, and sensing equipment condition shift the practical processing window. For incoming resin evaluation, capillary rheometry at 190°C across apparent shear rates of 100–1000 s-1 is used to detect lot-to-lot variation in extruder pressure. The melt index of 3.5 g/10 min provides a lower pressure coefficient than fractional-melt linear low-density polyethylene, but it does not eliminate shear-induced melt fracture on shallow-gap dies.
Because 5220G is an ethylene-octene copolymer, the short-chain branches are longer than those in butene-based linear low-density polyethylene. The hexyl branches derived from octene-1 increase the concentration of inter-lamellar tie molecules at equivalent density, which improves dart drop impact, Elmendorf tear, and puncture propagation resistance relative to butene-based LLDPE of similar melt index. In practice, the dart drop value measured by ASTM D1709 and the Elmendorf tear values measured by ASTM D1922 are strongly gauge dependent; published data for this specific configuration are limited unless film is produced on a standardized die with fixed blow-up ratio, frost line height, and cooling air condition. The same comonomer architecture lowers the seal initiation temperature relative to higher-density polyethylene and to many butene-based LLDPEs. Seal initiation should be evaluated under ASTM F2029 or equivalent heat-seal testing, using the exact seal pressure, dwell time, and film gauge of the final package. Incoming film qualification typically includes tensile yield and break strength per ASTM D882, dart impact per ASTM D1709, and Elmendorf tear per ASTM D1922; direct comparisons between suppliers remain invalid unless film fabrication parameters are normalized.
Primary commercial use is in blown film structures where low seal initiation and high puncture resistance are required. In coextruded film, 5220G is frequently placed as a sealant layer in multilayer laminates and as a core or skin layer in heavy-duty sacks, frozen food packaging, and form-fill-seal pouches. The sealant layer is processed on high-speed vertical form-fill-seal lines with typical sealing jaw temperatures of 110–140°C and dwell times of 0.3–1.0 s; actual values depend on film thickness, contamination, and sealing bar configuration. Film thicknesses from 25 µm to 125 µm are common for this product class. At high line speeds, the resin's 3.5 g/10 min melt index assists flow into thin gauge walls, while the low density contributes to seal integrity through a broader sealing window. Use in contact with food requires verification under FDA 21 CFR 177.1520 or EU Regulation No 10/2011 for the final article; the base polyolefin is generally recognized for such use when migration limits are met, but additives and other layers must be assessed separately.
In direct contrast to conventional butene-based Ziegler-Natta LLDPE, Dow ELITE LLDPE 5220G exhibits a more homogeneous placement of octene comonomer across the molecular weight distribution. Conventional butene-based LLDPE of similar density and melt index typically has a broader short-chain branching distribution and a higher fraction of material that contributes less to tie molecule concentration. This often appears as lower dart impact and lower Elmendorf tear at equivalent film gauge. Against single-site metallocene mLLDPE grades of equal density and melt index, 5220G may offer a broader processing window on older blown-film lines; many narrow-MWD mLLDPE grades generate higher extruder head pressure, higher motor load, and a narrower melt fracture-free output range when run on the same die and screw. Compared with high-pressure LDPE, 5220G has lower melt strength and less long-chain branching, so bubble stability is generally inferior. LDPE is often blended at 10–30 wt% to improve bubble stability and optics, though this addition raises seal initiation temperature and reduces dart impact relative to neat 5220G film.
Processors should not treat the grade as a direct drop-in replacement for fractional-melt LDPE, high-pressure LDPE, or cast-film LLDPE without adjusting die geometry and cooling air. The differences in melt strength, shear sensitivity, and comonomer architecture require line trials with defined film gauge and end-use sealing conditions.
On dies with small die gaps or worn lip surfaces, melt fracture may appear as surface roughness or sharkskin at outputs above a critical shear stress. Immediate corrective actions are to raise die temperature by 5–10°C, widen the die gap within the 1.8–2.5 mm band, reduce screw speed, or add a polymer processing aid if the formulation lacks one. Bubble instability is typically observed as vertical or horizontal oscillation when the frost line is too low or the air ring damper position is not matched to the bubble diameter. The processor can raise the frost line to 8–10 die diameters or reduce blow-up ratio to the lower end of 2.2–2.5. Because 5220G is not hygroscopic, pre-drying is generally unnecessary; surface condensation on cold pellets moved into a warm, high-humidity production area can be managed by a hot-air hopper dryer at 50°C for 2–4 h. Avoid melt temperatures above 240°C for extended residence times, as this may generate odor, gels, and discoloration. Purging with a low-melt-index LDPE or a commercial purging compound after shutdown is recommended to prevent carbonized residue in downstream runs.
Shipments should be stored in clean, dry warehouses at ambient temperatures below 40°C, protected from direct sunlight and ultraviolet exposure. The resin is not classified as hazardous under REACH or RoHS for the polymer itself, but the supplier safety data sheet and product stewardship bulletin are controlling for additive disclosures and exposure limits. In the European Union, the final plastic food-contact article must meet overall migration limits of 10 mg/dm² under EU Regulation No 10/2011; for fatty food simulants, migration testing should follow the specified simulant D1 or D2 protocols. No specific ozone-depleting substances are used in the solution polymerization process, and the product is not intentionally formulated with per- or polyfluoroalkyl substances. Processability and film property data for this exact grade should be confirmed against the lot certificate of analysis and the latest Dow technical data sheet, because variations in catalyst lot, comonomer content, and antioxidant package can shift film properties within the specification range.
