| HS Code | 193471 |
| Density | 0.921 g/cm³ (ASTM D792) |
| Melt Flow Index | 2.3 g/10 min (190 °C/2.16 kg, ASTM D1238) |
| Melting Point | 123 °C (DSC) |
| Vicat Softening Temperature | 105 °C (ASTM D1525) |
| Film Tensile Strength At Yield Md | 12 MPa (ASTM D882) |
| Film Tensile Strength At Break Md | 39 MPa (ASTM D882) |
| Film Elongation At Break Md | 800% (ASTM D882) |
| Film 1 Secant Modulus Md | 200 MPa (ASTM D882) |
| Film Dart Drop Impact F50 Method A | 320 g (ASTM D1709) |
| Film Haze | 5% (ASTM D1003, 25 µm) |
| Film Gloss 60 | 80 (ASTM D2457) |
As an accredited Dow DOWLEX LLDPE 2507G factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg sealed bags as LLDPE resin pellets, Dow DOWLEX LLDPE 2507G for safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with Dow DOWLEX LLDPE 2507G polyethylene resin, palletized and secured for safe transport. |
| Shipping | DOWLEX LLDPE 2507G is shipped as free-flowing plastic pellets in 25 kg bags, octabins, or bulk tankers. It is non-hazardous under transport regulations (IMDG/ADR), but should be kept dry, away from heat and direct sunlight. Avoid excessive dust accumulation and ensure containers are clean before loading. |
| Storage | Store DOWLEX LLDPE 2507G in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and strong oxidizers. Keep bags sealed or covered to prevent moisture pickup, dust, or contamination. Maintain moderate temperatures, avoid excessive stacking or mechanical damage, and use FIFO rotation. No special hazardous storage is required under normal handling conditions. |
| Shelf Life | Shelf life is indefinite when stored in a cool, dry place away from sunlight and heat. |
In exposed geomembrane liner production, the critical raw resin selection parameter is balanced density and slow crack growth resistance under constant stress. DOWLEX 2507G, with nominal density 0.925 g/cm³ (ISO 1183-1:2019) and melt flow rate 0.85 g/10 min (ISO 1133-1:2022, 190 °C / 2.16 kg), is processed in monolayer flat-die extrusion and calendering at 100 wt% virgin resin. For UV-stabilized black sheet, 5.0–7.5 wt% of a 40% carbon black LLDPE-based masterbatch is dry-blended to achieve a final carbon black content of 2.0–3.0 wt%, as required by GRI GM13 Table 2. The extrusion line typically uses a 75 mm single-screw extruder with 30:1 L/D and a grooved feed section, barrel zone set points from 180 °C at the feed throat to 220 °C at the metering section, a coat-hanger flat die held at 220–230 °C, and a three-roll calendering stack with roll temperatures from 70 °C to 90 °C. Calendered sheet of 1.0–3.5 mm thickness is produced at line speeds from 6 m/min to 15 m/min, depending on web width and cooling capacity. Qualified sheet is evaluated under ASTM D6693 for tensile properties, ASTM D1004-13 for tear resistance, ASTM D4833 for puncture resistance, ASTM D5397 for single-point notched constant tensile load, ASTM D3895 for oxidative induction time, and ASTM D5596 for carbon black dispersion. Production-scale failure modes include carbon black macro-dispersion defects, edge bead thickness variation above ±5%, and melt temperature exceeding 240 °C at the die lip, which can deplete hindered phenolic antioxidant packages and reduce standard OIT below the typical 100 min threshold. If regrind or carbon black masterbatch has been stored at relative humidity above 70%, moisture-induced bubbles in the sheet are controlled by hopper drying at 70 °C for 2 h. The terminal products are smooth or textured geomembranes for landfill basal liners, secondary containment basins, mining heap leach pads, canal liners, and wastewater lagoon liners.
Blown film conversion for FIBC inner liners demands a formulation that preserves film toughness after high-stalk bubble cooling and high-stalk frost line control. The comonomer distribution of DOWLEX 2507G allows a monolayer formulation of 100 wt% DOWLEX 2507G for liners exposed to puncturing by granular or pelletized cargo; for improved bubble stability on lines with die diameters above 300 mm, 10–20 wt% of a high-pressure LDPE with MFR 0.2–0.8 g/10 min is melt-blended. A typical three-layer blown film line uses a 70 mm grooved-feed extruder with 30:1 L/D, barrel set points from 190 °C to 230 °C, die head temperature 220–230 °C, die gap 1.4–2.0 mm, blow-up ratio 1.8–2.8, and high-stalk frost line height 700–1,100 mm above the die. Film thickness for FIBC liners is commonly 80–200 μm, with individual layer thickness variation controlled within ±5 μm by inner bubble cooling and gauge control cages. Melt pressure at the die inlet on a 250 mm die may vary from 280 bar to 350 bar as output, die gap, and frost line setting shift, and pressure fluctuation above ±10 bar typically indicates feed throat bridging or insufficient grooved-feed temperature control. Conformance is evaluated against ISO 21898:2013 for flexible intermediate bulk containers, ISO 527-3 for tensile properties of film, ISO 6383-2 for tear resistance, and ASTM D1709-16a for dart drop impact. Terminals include form-fit liner bags for FIBCs, heavy-duty shipping sacks for polymer pellets, compression-stacked agricultural sacks, and industrial dust containment liners.
Extrusion coating and lamination onto woven polypropylene fabric for flexible intermediate bulk containers and industrial tarpaulins use DOWLEX 2507G at 70–85 wt% blended with 15–30 wt% LDPE to control neck-in and draw resonance. On a 90 mm single-screw extruder with 30:1 L/D and a coat-hanger die of 1,500–2,500 mm effective width, the melt temperature at the die exit is held between 285 °C and 310 °C to promote oxidation-induced adhesion to woven polypropylene tapes. Air gap is set at 150–300 mm, chill roll temperature at 15–25 °C, and line speed ranges from 100 m/min to 250 m/min for coat weights of 15–40 g/m². Typical production defects include edge neck-in above 35 mm per side, pinholes caused by unwind tension oscillation, and poor hot-tack adhesion when the substrate preheat is below 40 °C. Compliance testing for food-contact structures follows FDA 21 CFR 177.1520 and EU Regulation 10/2011 with overall migration under food simulants, while non-food industrial laminates use REACH Annex XVII restrictions and ISO 8256 tensile-impact for coated fabric. Terminal products include coated woven polypropylene sacks for fertilizers, chemical powder bags, industrial tarpaulins, carpet secondary backing, and extrusion-coated release layers for petrochemical packaging.
Rotational molding of closed-head storage tanks requires powder flow, particle size distribution, and a resin density low enough to prevent brittle failure at wall thickness transitions. DOWLEX 2507G is pulverized to a typical particle size distribution of 35–100 mesh, with 100 wt% of the powder blend composed of DOWLEX 2507G; UV-stabilized tanks add 0.3–0.8 wt% of a hindered amine light stabilizer masterbatch, and carbon black tank formulations add 0.5–1.5 wt% carbon black via a polyethylene-based masterbatch. The rotomolding cycle uses a biaxial carousel machine, oven air temperature 280–320 °C, mold internal air temperature reaching 180–210 °C before cooling, and a total heating time of 18–30 min for a 5–10 mm nominal wall. Undercured sections, caused by internal air temperature below 175 °C, exhibit gas bubbles, pinholing, and reduced impact strength. Compliance is verified to ASTM D1998 for upright polyethylene storage tanks, ISO 3451-1 for ash content from pigment packages, and ISO 22088-2 for environmental stress crack resistance. Terminal products include agricultural water tanks, chemical dosing tanks, road barriers, and rotationally molded kayak bodies.
On high-output cast stretch film lines used for pallet load containment, a three-layer coextruded structure with DOWLEX 2507G in the core at 70–90 wt% of total structure, and skin layers of metallocene LLDPE or LDPE at 5–15 wt% each, is processed on a cast stretch line with 75 mm extruders and 30:1 L/D, die temperature 240–260 °C, chill roll 15–20 °C, and line speed 350–700 m/min for film thickness of 30–80 μm. Elastic recovery after elongation is evaluated under ASTM D5458 for stretch wrap energy and cling, ASTM D5748 for puncture resistance and protrusion puncture, ASTM D1894-14 for coefficient of friction, and ASTM D882-18 for tensile properties. Control of neck-in below 50 mm per side and optimum cling force between 100 g/cm and 250 g/cm requires balancing core layer melt temperature and chill roll speed. Terminal products are stretch hood films for pallet unitization, heavy-duty machine films, and outdoor UV-stable transport wraps.
In flexible intermediate bulk containers and bag-in-box packaging, coextruded sealant webs use the resin as a heat-seal layer because of its low seal initiation temperature and high hot tack strength. Published peel data for DOWLEX 2507G in exact coextruded tie-layer configurations is limited; converters typically validate via ISO 11339 T-peel after 24 h conditioning. In a three-layer cast or blown film, the sealant layer comprises 80–100 wt% DOWLEX 2507G, with 0–20 wt% of an mLLDPE sealing-grade polyethylene of density 0.915–0.920 g/cm³ blended to lower seal initiation temperature below 100 °C when the converting specification demands sub-100 °C sealing. The process uses a 65 mm extruder with 30:1 L/D, die temperature 210–230 °C, chill roll 15–25 °C, and total film thickness 40–120 μm. Compliance is assessed under FDA 21 CFR 177.1520, EU Regulation 10/2011 with overall migration testing, and EC 1935/2004. Hot tack strength is measured under ASTM F1921. End products are sealant webs for liquid bag-in-box films, pasteurization pouches, and sterile barrier lidding films.
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Dow DOWLEX LLDPE 2507G is an ethylene-octene linear low-density polyethylene resin supplied as free-flowing pellets for monolayer and coextruded blown film. The solution-polymerised molecular architecture combines a linear polyethylene backbone with hexyl short-chain branches from octene incorporation. This structure differs from butene-copolymer LLDPE by placing longer branches along the chain, which influences tie-chain formation during crystallisation. The nominal density is 0.925 g/cm³ when measured under ASTM D792, and the nominal melt index is 0.75 g/10 min when measured under ASTM D1238 at 190 °C and 2.16 kg. The resin is stabilised for extrusion at melt temperatures up to 240 °C; sustained operation above 250 °C may reduce antioxidant effectiveness and increase gel formation in the extruder and die.
Because the resin is non-hygroscopic, drying is not normally required during ambient storage below 60 % RH. Condensation on cold pellet surfaces should be avoided. If pellets are transferred from refrigerated storage to a warm production area, a hopper dryer set at 70 °C to 80 °C for 2 h to 4 h can be used to remove surface moisture. Pellet geometry and bulk density affect feed-throat conveying. Bridging in hoppers with cone angles below 60° is occasionally observed when ambient humidity exceeds 75 % RH and surface moisture raises interparticle friction. Nitrogen purging or a desiccant bed is a common plant-scale corrective measure.
The principal processing constraints for DOWLEX 2507G are melt temperature, die gap, and bubble cooling. On production-scale lines with single-screw extruders of 75 mm to 120 mm diameter and L/D ratios between 30:1 and 36:1, barrel temperature profiles typically rise from 170 °C in the feed zone to 210 °C to 240 °C in the metering zone. Melt temperature at the die is commonly maintained at 190 °C to 240 °C. Below 185 °C, melt viscosity increases and die pressure rises, which can reduce output and destabilise the bubble. Above 250 °C, degradation by-products can accumulate at the die lips, generating gels and reducing film appearance. Die gap settings for heavy-duty sack film range from 1.5 mm to 2.5 mm, and blow-up ratios between 2.0:1 and 3.0:1 are used to balance machine-direction and transverse-direction tear strength. Frost line height is commonly set at 7 to 10 die diameters. These ranges are operational starting points, not guaranteed quality windows; lot-to-lot melt index variation and downstream equipment configuration require line-specific validation.
Bubble cooling performance controls the property balance. In high-output lines equipped with external air rings and internal bubble cooling, melt temperature uniformity across the die circumference should be held within ±2 °C. Larger deviations produce gauge bands at the nip and are frequently traced to blocked die gaps or damaged die heaters. Capacitance gauges on blown film lines can show gauge variation rising from ±3 % to ±6 % when die-lip polymer flow is disturbed by degraded resin accumulation. Screen-pack specification is therefore important. Extruder screens below 250 µm mesh remove carbonised resin but increase back pressure and may require lower screw speed to avoid melt temperature overshoot.
DOWLEX 2507G is used in heavy-duty shipping sacks, industrial liners, carrier films, freezer packaging, and agricultural film. In heavy-duty sack applications at thicknesses from 75 µm to 150 µm, the octene comonomer contributes to dart impact resistance measured under ASTM D1709/A and Elmendorf tear resistance measured under ASTM D1922. The material is also coextruded as the outer layer in barrier packaging where water vapour transmission rate, measured under ASTM F1249, is controlled by film thickness and orientation. Published data for the specific film property values of DOWLEX 2507G in these configurations is available in the manufacturer’s technical datasheet; converters should qualify the grade on their own blown film lines because values are strongly influenced by blow-up ratio, frost line height, and bubble cooling rate.
Because DOWLEX 2507G is designed primarily for blown film, extrusion lamination and injection moulding are not the main conversion routes. Screw design for blown film should include a barrier section with sufficient length to complete melting before the metering zone; otherwise, unmelts can appear as fish-eye defects in film. On lines with short screws of L/D 24:1, raising melt temperature to the upper end of the range may be necessary, but this can reduce melt strength and bubble stability.
Heat-seal performance of DOWLEX 2507G is governed by density and comonomer distribution. Seal initiation temperature is typically lower than that of high-density polyethylene but higher than metallocene LLDPE with high comonomer content. Seal strength measured according to ASTM F88 depends on jaw temperature, dwell time, and cooling rate. For heavy-duty sacks, hot-tack strength measured under ASTM F1921 is relevant to form-fill-seal operations. Published data for this specific grade is limited; converters should establish a seal curve on their own packaging lines rather than relying on resin supplier values alone.
In film property terms, the density of 0.925 g/cm³ places DOWLEX 2507G in a medium-low density region. Typical blown film tensile yield strength measured under ASTM D882 is in the range 10 MPa to 16 MPa depending on gauge and orientation. Ultimate tensile strength can exceed 40 MPa in machine direction at moderate blow-up ratios, but these values are fabrication-dependent. Elmendorf tear values under ASTM D1922 are thickness-dependent and should be compared only at equal gauge. Dart impact under ASTM D1709/A is also strongly dependent on film thickness, frost line height, and blending with recycled material.
DOWLEX 2507G can be processed without fluoropolymer processing aids in clean lines. If melt fracture is observed at high output, a fluoropolymer-based processing aid masterbatch may be added at 200 ppm to 500 ppm by weight. Addition of high levels of zinc stearate or certain amine-based stabilisers may interact with phenolic antioxidants and should be evaluated. Direct contact with copper or copper alloys in extruder components should be avoided because copper ions can accelerate thermo-oxidative degradation of polyethylene.
The difference between DOWLEX 2507G and a butene-copolymer LLDPE of equivalent density and melt index is not primarily visible in density or melt flow, but appears in impact and tear behaviour. Under ASTM D1709/A, octene-based films typically show dart impact values 20 % to 30 % higher than butene-based films at the same gauge, although this gap narrows above 100 µm. Elmendorf tear strength under ASTM D1922 is also improved in both machine and transverse directions. The improvement arises from the longer hexyl branches in octene LLDPE, which act as tie-chains between lamellae. Published data for this exact comparison is limited to commercial technical literature; absolute values depend on film fabrication history.
Compared with DOWLEX 2045G, which has a nominal density of 0.920 g/cm³ and melt index 1.0 g/10 min, DOWLEX 2507G has higher melt strength and higher modulus but lower drawdown in thin-gauge applications. Compared with DOWLEX 2108G, which has a nominal density of 0.935 g/cm³ and melt index 0.8 g/10 min, DOWLEX 2507G offers lower stiffness but greater impact resistance and lower risk of stress cracking under continuous load. The density difference of 0.010 g/cm³ may appear small; however, crystallinity changes associated with density variation shift the balance between stiffness and toughness.
| Grade | Nominal Density | Nominal Melt Index | Differentiating Feature |
|---|---|---|---|
| DOWLEX 2507G | 0.925 g/cm³ | 0.75 g/10 min | octene comonomer for balanced toughness and stiffness |
| DOWLEX 2045G | 0.920 g/cm³ | 1.0 g/10 min | higher melt flow for thin-gauge film |
| DOWLEX 2108G | 0.935 g/cm³ | 0.8 g/10 min | higher density and stiffness |
Compared with low-density polyethylene of equivalent melt index, DOWLEX 2507G has a narrower molecular weight distribution and lower long-chain branching. The practical consequence on a blown film line is a lower degree of shear thinning under ASTM D3835 capillary rheometry; melt viscosity at high shear rates remains higher relative to LDPE. Extruder amperage and die pressure may therefore be higher at the same screw speed, and bubble stability may require a wider die gap or a lower frost line. Coextrusion with LDPE is commonly used to improve melt strength and bubble stability while retaining the toughness of octene LLDPE.
On a three-layer ABC film line with 70 mm extruders and a 400 mm die, DOWLEX 2507G may be run in the outer layers at 90 kg/h to 120 kg/h per extruder with die temperatures of 220 °C. Bubble cooling air temperatures of 10 °C to 20 °C are common. Nip speed is adjusted to achieve final film thickness tolerance of ±5 %. These are plant-specific starting conditions; published data for this exact configuration is limited. Incoming resin lots should be tested for melt index under ASTM D1238 and density under ASTM D792 before line start-up. A variation in melt index of ±0.05 g/10 min may shift melt temperature and die pressure noticeably; lot-to-lot variation outside this range often requires adjustment of screw speed or barrel temperature profile. If film dart impact varies by more than 10 % between lots, bubble cooling and frost line height should be checked before attributing the change to the resin.
Compliance testing for food-contact use must be completed by the converter. Grade-specific certificates of compliance should be requested from the resin supplier for each production lot. For industrial non-food applications, the main regulatory requirement is often REACH and RoHS compliance of the final article. Published data for DOWLEX 2507G in specific food simulants such as 10 % ethanol or 3 % acetic acid is limited; end-use qualification is required.
| Standard or Regulation | Scope | Typical Assessment |
|---|---|---|
| FDA 21 CFR 177.1520(c) | Olefin polymers in food contact | Condition of use dependent; migration testing required |
| EU Regulation (EU) No 10/2011 | Plastic materials in contact with food | Overall migration limit 10 mg/dm²; specific migration limits apply |
| REACH Regulation (EC) No 1907/2006 | Chemical registration and authorisation | SVHC content below 0.1 wt% by article; supplier certificate required |
| RoHS Directive 2011/65/EU | Restriction of hazardous substances | Lead, mercury, hexavalent chromium, PBB and PBDE below 0.1 wt%; cadmium below 0.01 wt% |
| CONEG | Heavy metals in packaging | Combined lead, cadmium, mercury and hexavalent chromium below 100 ppm |
