| HS Code | 211352 |
| Density | 0.920 g/cm³ |
| Melt Flow Index | 0.6 g/10 min (190°C, 2.16 kg) |
| Melting Point | 122 °C |
| Vicat Softening Point | 105 °C |
| Tensile Strength At Yield | 11 MPa |
| Tensile Strength At Break | 25 MPa |
| Elongation At Break | 800 % |
| Flexural Modulus | 260 MPa |
| Dart Drop Impact | 600 g |
| Elmendorf Tear Strength | 200 g (MD) / 500 g (TD) |
As an accredited Dow DOWLEX LLDPE 2645G factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as 25 kg polyethylene-lined bags on shrink-wrapped pallets, or 500 kg bulk bags of DOWLEX LLDPE 2645G. |
| Container Loading (20′ FCL) | 20′ FCL: Dow DOWLEX LLDPE 2645G loaded in 25 kg bags on pallets, approximately 20 MT per container. |
| Shipping | Dow DOWLEX LLDPE 2645G is a linear low-density polyethylene resin, shipped as free-flowing pellets. It is non-hazardous under normal transport conditions. Product is typically supplied in 25 kg bags, octabins, or bulk containers. Keep dry, avoid excessive heat and direct sunlight, and store in a clean, ventilated area. |
| Storage | Store Dow DOWLEX LLDPE 2645G in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers sealed and protected from moisture and contamination. Avoid generating dust and static electricity. Store away from strong oxidizing agents and incompatible materials. No special temperature control is required, but maintain good housekeeping to minimize fire risk. |
| Shelf Life | Dow DOWLEX LLDPE 2645G has no specified shelf life; if stored properly in dry, cool conditions, it remains usable indefinitely. |
DOWLEX 2645G is an ethylene-octene linear low density polyethylene with a nominal density of 0.9185 g/cm³ per ASTM D792 and a melt flow rate of 0.90 g/10 min at 190°C/2.16 kg per ASTM D1238. In heavy-duty industrial sack film of 80–120 µm gauge, three-layer coextrusion on a 250 mm spiral mandrel die with 30:1 L/D grooved-feed extruders is the standard production configuration. The core layer is compounded with 60–80 wt% DOWLEX 2645G; the outer layers are formulated with HDPE or MDPE to raise modulus, reduce blocking, and improve sack stiffness after filling. The die gap is maintained between 1.8 mm and 2.2 mm, and the blow-up ratio is set between 2.0:1 and 2.6:1 to balance machine-direction and transverse-direction tear. Melt temperature at the die is held between 210°C and 230°C. Below 205°C, the melt pressure on a 90 mm grooved-feed extruder can exceed 420 bar, accelerating screw and barrel wear in the feed zone. Above 240°C, oxidation gel counts increase and melt strength falls, destabilizing the bubble at high frost line heights. Output rates on a 90 mm main extruder generally range from 150 kg/h to 180 kg/h when the frost line is controlled at 500–700 mm. The formed sack film is tested for drop dart impact per ASTM D1709A, Elmendorf tear per ASTM D1922, tensile properties per ASTM D882, and slow puncture resistance per ASTM D5748. The finished sacks are used for 25–50 kg resin, chemical, mineral, and construction material packaging where puncture failure during freight handling is the dominant rejection mode.
Greenhouse and silage wrap structures built around DOWLEX 2645G typically require gauge bands of 150–200 µm and are extruded at melt temperatures of 200–220°C to limit degradation of UV stabilizer packages. The resin is not processed as a neat polymer in agricultural film. A core layer containing 70–85 wt% DOWLEX 2645G is combined with metallocene LLDPE or EVA skin layers to improve cling, bubble stability, and low-temperature flexibility at blow-up ratios of 2.5:1 to 3.0:1. The die gap is widened to 2.0–2.5 mm because narrow die gaps create excessive shear heating that can deactivate hindered amine light stabilizers. UV protection is introduced as a masterbatch containing 0.5–1.0 wt% active HALS and 0.1–0.3 wt% benzotriazole UV absorber. Compatibility with DOWLEX 2645G must be verified before production because some amine-based additive packages can form gel specking when carrier resins contain elevated catalyst residues; although DOWLEX 2645G is produced by solution polymerization with low residual catalyst content, incoming masterbatch carriers and recycled edge trim can still generate melt pressure fluctuations above ±15 bar at constant screw speed. The final greenhouse film is evaluated under ISO 527-3 for tensile properties, ASTM D1004 for initial tear resistance, and EN 13206 for greenhouse film durability. Silage wrap made from this structure is used for round bale sealing and clamp silage covers where puncture from stalk ends is the primary field failure mode.
Frozen food packaging film in the 50–80 µm gauge range undergoes a shift in failure mode from ductile yielding to brittle fracture as the temperature approaches −20°C and below. DOWLEX 2645G is processed in monolayer and three-layer structures at melt temperatures of 200–215°C, a die gap of 1.5–2.0 mm, and a blow-up ratio of 2.5:1 to reduce tear anisotropy. The controlling material property for freezer service is not room-temperature dart impact per ASTM D1709A at 23°C, but retained dart impact at −20°C. Standard laboratory dart tests at ambient temperature do not reliably predict frozen abuse performance because polyethylene impact resistance changes as segmental mobility decreases near the beta-relaxation region. Converters should therefore perform frozen drop testing at −20°C using conditioned specimens and record the normalized failure energy in relation to film gauge. Heat seal strength is measured per ASTM F88 after sealing at 130–150°C. Because DOWLEX 2645G has a density of 0.9185 g/cm³, its seal initiation occurs at a lower temperature than HDPE but higher than EVA-rich sealants; lap seals generally fail by delamination rather than peel at seal bar temperatures below 120°C. The finished film is used for frozen vegetable bags, ice cube pouches, and freezer-ready bulk packaging. Seal contamination by vegetable particles at the jaw surface is a known production-scale failure: a minimum seal bar opening of 5 mm and Teflon-coated jaws reduce leaker rates. Slip and antiblock masterbatches are incorporated at 0.5–1.5 wt% to maintain a coefficient of friction below 0.40 per ASTM D1894, preventing film roll blocking during low-temperature storage.
Laminated pouch structures for dry food and medical disposables commonly place a 30–50 µm blown film sealant web of DOWLEX 2645G adjacent to barrier layers such as aluminium foil or metallized polyester. The sealant web is extruded at 215–225°C through a 1.2–1.5 mm die gap with a blow-up ratio of 2.2:1. Corona treatment is applied in-line to a wetting tension of 38–42 dyn/cm per ASTM D2578 before lamination to ensure uniform wetting of polyurethane adhesives. The presence of octene branches in DOWLEX 2645G reduces the crystalline melting onset compared with butene-LLDPE, which lowers the heat seal initiation temperature to a range of 100–110°C on hot-bar sealers. This allows faster packaging line speeds on vertical form-fill-seal machines running at 35–45 cycles/min. Seal strength after lamination is evaluated per ASTM F88 with 15 mm wide specimens; values below 12 N/15 mm generally indicate inadequate corona treatment, incomplete adhesive cure, or sealant web thickness variation exceeding ±5%. For food-contact applications, the finished laminate must meet overall migration limits of 10 mg/dm² under EU Regulation (EU) No 10/2011 and extractives limitations under 21 CFR 177.1520(c) for olefin polymers. DOWLEX 2645G is not recommended for direct contact with high-fat solvents above 60°C unless the total package design is validated for the specific food simulant. The final pouches are used for dry soup mixes, powdered beverages, and sterile medical device overwrap where seal integrity and puncture resistance during distribution are critical.
Heavy-gauge industrial liners of 200–300 µm thickness are produced on large blown-film lines with die diameters of 400–600 mm and output rates above 300 kg/h. DOWLEX 2645G is used as the entire structure or as a core layer between two pigmented MDPE skins. The octene comonomer distribution in DOWLEX 2645G provides a lower brittle-to-ductile transition than butene-based LLDPE, which is critical for liners that are folded and unfolded at construction sites in low-temperature conditions. The extrusion window is narrower than thin-gauge film: melt temperature must be held between 215°C and 235°C, and bubble stability requires a blow-up ratio of 2.0:1 to 2.4:1 with a frost line height of 700–1000 mm. High stalk configurations are avoided because excessive melt orientation raises transverse-direction tear weakness, a known cause of split propagation during lifting. Weld seams are made by hot-wedge sealing at 150–170°C and are tested for seam strength per ASTM F88. The liner film is evaluated for puncture resistance per ASTM D5748 at a test speed of 50 mm/min. A production-scale bottleneck is the accumulation of static charge on the expanded bubble; in-line antistatic additives are used at 0.1–0.3 wt%, but overdosing above 0.5 wt% reduces interlayer adhesion in three-layer structures and can lower hot-tack strength. The liners are employed for waste containment, temporary spill berms, and packaging of glass fibre insulation batts. Published data for this specific configuration is limited; converter validation should include seam strength after folding at −10°C and exposure to construction-site abrasion.
In pallet stabilization, stretch hood films demand a balance of elastic recovery, puncture resistance, and weld line toughness. DOWLEX 2645G is incorporated in three-layer stretch hood structures at 60–80 wt% in the core, with outer layers formulated from metallocene plastomers to reduce elastic modulus and improve recovery. The film gauge is typically 70–120 µm. Extrusion uses a die gap of 1.8–2.4 mm, a blow-up ratio of 2.0:1 to 2.5:1, and melt temperatures of 210–225°C. Because stretch hood film is heat-sealed by impulse or hot-air welding after stretching, the weld must survive 20–30% residual elongation. Heat seal strength is tested per ASTM F88, and elastic recovery is measured at 100% and 200% strain using a 500 mm/min tensile speed per ISO 527-3. A known failure mode on production lines is neck-in at the weld, which can be reduced by controlling melt flow rate ratio and by using a 2.5:1 blow-up ratio rather than high-stalk processing. The final stretch hood is applied by rotary arm machines at 15–20 pallets/h; film breakdown during application is most frequently caused by gauge variation exceeding ±8%, not by puncture. Therefore, in-line gauge control with a capacitive sensor and automatic air ring is mandatory for this grade when used in stretch hood structures.
Because collation shrink film for bottled water or canned goods normally uses LDPE/LLDPE blends with high machine-direction shrink and low shrink force, substitution of DOWLEX 2645G as the central layer at 40–60 wt% increases puncture resistance but reduces free shrink relative to EVA or plastomer-rich formulations. The melt temperature is set at 220–230°C, with a die gap of 1.5–2.0 mm and a blow-up ratio of 2.0:1 to 2.5:1. After extrusion, the film is oriented on a tenter frame or double-bubble line. In the double-bubble process, the primary bubble is quenched below 40°C before reheating to 110–120°C for biaxial orientation. At these conditions, DOWLEX 2645G exhibits lower transverse shrink than LDPE but improves the tear resistance of the final film during shrink tunnel leaks. Free shrink is measured per ASTM D2732 in 85°C and 120°C water baths; a typical specification for collation shrink requires 10–15% machine-direction shrink at 85°C. Converters using DOWLEX 2645G must compensate with higher orientation ratios to meet shrink targets, which raises the risk of bubble burst when the primary bubble contains gels or pigment agglomerates. The final film is evaluated for shrink force per ISO 14616 to avoid crushing lightweight cans. This structure is commercially used for low-weight tray overwrap where puncture resistance is valued over maximum free shrink.
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DOWLEX™ LLDPE 2645G is a linear low density polyethylene produced by solution polymerisation, with a nominal density of 0.926 g/cm³ when tested to ASTM D792 and a melt index of 0.90 g/10 min under 190°C/2.16 kg conditions in ISO 1133-1:2022. The resin is supplied in pellet form and is specified for blown-film and cast-film conversion where stiffness, puncture resistance, and draw performance are balanced against processability. Because the grade uses octene-1 as the comonomer, its short-chain branch length is greater than that of butene-based LLDPE at equivalent density; the resulting tie-molecule population in the semicrystalline network influences tear propagation in a way that is not captured by melt index alone. On production-scale blown-film lines, the medium-viscosity melt permits lower extrusion torque than fractional-melt LLDPE and is commonly run without predrying, provided pellet surface condensation is avoided. Cold pellets introduced from outdoor storage should be brought to warehouse temperature before feeding, because surface moisture on pellets can cause feed-zone slip and surge.
The grade is frequently positioned between lower-density octene LLDPE and higher-density film resins. The density of 0.926 g/cm³ provides higher tensile modulus than a 0.920 g/cm³ film resin while retaining impact performance in heavy-duty packaging. Converters evaluating a new lot should not rely on nominal datasheet values alone; batch-to-batch variation in melt index is controlled by the supplier, but film properties depend on die gap, frost-line height, draw ratio, and cooling air flow.
At a fixed density and melt index, the mechanical difference between butene-based and octene-based LLDPE arises from branch architecture rather than molar mass distribution. The hexyl branches from octene-1 resist chain sliding during yield more effectively than ethyl branches from butene-1, increasing the energy required to initiate and propagate a crack. This difference is visible in Elmendorf tear testing under ASTM D1922 and puncture testing under ASTM D5748. Transverse-direction tear of an octene-based blown film can be higher than that of a butene film at the same gauge and blow-up ratio, but the result is not guaranteed unless machine-direction orientation is rebalanced. Overdraw in the machine direction concentrates polymer chains along the haul-off direction and reduces transverse tear; converters using DOWLEX 2645G in a butene-grade replacement must therefore re-optimise blow-up ratio and frost-line height rather than simply substituting in the same screw and die conditions.
Dart impact measured under ASTM D1709 is another differentiator. In heavy-duty sacks or agricultural film, a gauge reduction may be attempted after switching to the octene-based resin. The failure mode during dart testing often shifts from brittle fracture to ductile elongation at the same gauge, an observation consistent with longer branches increasing tie-chain density. However, the actual improvement is specific to extrusion conditions; films with high frozen-in stress can lose expected impact performance. Validation should include at least 3 separate film lots and 5 specimens per lot for statistically stable data.
Compared with high-pressure LDPE, the difference is more process-related. Low-density polyethylene has long-chain branching that delivers higher melt strength and a broader bubble-stability window, while the linear LLDPE requires a higher blow-up ratio and internal bubble cooling to approach similar film gauge control. The LLDPE density provides a modulus advantage and permits down-gauging for equivalent load-bearing capacity in many packaging applications. Selection between the two depends on the failure mode of the end-use packing line: high-speed form-fill-seal operations may require the seal initiation and puncture behaviour of LLDPE, while shrink operations may favour LDPE orientation and shrink response.
Cast-film lines using DOWLEX 2645G operate against a different instability mechanism. Melt curtain resonance and neck-in are more important than bubble stability. The 0.90 g/10 min melt index of the resin is low enough to maintain melt curtain stiffness and reduce neck-in relative to high-flow LLDPE, but high enough to avoid the extreme back pressure of fractional-melt grades. On a cast-film extruder with L/D of 30:1, barrel settings between 200°C and 240°C and die settings from 240°C to 260°C are typical; chill-roll temperatures from 15°C to 30°C control curl and crystallinity. The rapid cooling of cast film produces lower crystallinity than slower air-cooled blown film, which can reduce haze and increase tear relative to blown film at the same gauge. Published data for this specific configuration is limited, but the trend is consistent with solution LLDPE extrusion practice.
In cast stretch-film lines, DOWLEX 2645G may be used as a core or skin layer, depending on the required balance of cling, release, and puncture. The lower melt index relative to metallocene-catalysed LLDPE with melt indices above 2.0 g/10 min creates a narrower flow distribution in the die; die-lip adjustment and internal deckle position are critical for gauge uniformity. Operators should log die pressure at constant throughput and not exceed the maximum melt temperature specified by the supplier to avoid crosslinking, gel formation, and degradation-induced odour. The addition of process aids is not automatically required, but if sharkskin or severe die-lip build-up appears, fluoropolymer-based PPA at 400–800 ppm is used in industrial practice to reduce extrusion pressure and surface defects.
Single-screw extrusion of DOWLEX 2645G requires attention to screw compression ratio and barrier-flight geometry. The resin melt index of 0.90 g/10 min does not indicate its true shear-thinning behaviour; solution LLDPE resins are less shear-thinning than high-pressure LDPE and require higher torque for the same throughput. Screw designs with L/D from 24:1 to 30:1 and compression ratio between 2.5:1 and 3.5:1 are commonly used in film processing. Grooved-feed extruders increase solids conveying and can produce high head pressure; screen-chamber pressure should be monitored to avoid exceeding the maximum melt pressure of the resin and causing melt temperature override.
Die gap selection has a direct effect on film gauge uniformity and melt fracture. A narrow die gap of 1.2 mm can raise shear rate and produce sharkskin at the die exit, particularly with linear resins. Increasing the die gap to 1.8–2.5 mm reduces die-lip shear stress and can eliminate melt fracture without requiring process aid. However, a wider die gap increases draw-down requirement; haul-off speed must rise, and frost-line height must be adjusted to prevent low orientation. With internal bubble cooling systems, a high blow-up ratio of 2.5–3.0 is used to balance MD and TD mechanical properties. External air-ring settings are adjusted until the frost line is stable and symmetrical, and bubble oscillation is damped. Actual settings vary with tower height and ambient temperature.
Temperature profile selection also influences the processing window. In a typical blown-film line, feed-zone temperatures are held at 180°C to 200°C, compression-section temperatures from 200°C to 220°C, and die zones from 220°C to 240°C. Melt temperature should not exceed 250°C during stable operation; prolonged residence at higher temperatures can initiate free-radical degradation and create gel specks in the film. For extrusion coating or high-temperature cast film, residence time is shorter, so melt temperatures up to 260°C are possible, but the supplier’s current processing guidelines should be consulted.
Replacement of a butene-based LLDPE with DOWLEX 2645G at the same nominal density and similar melt index changes both solid-state and coextrusion behaviour. The solid-state changes arise from the longer comonomer branch, which alters the sequence length distribution of crystallisable ethylene segments. In tensile testing according to ISO 527-2, the octene-based grade often shows higher strain at break and similar or higher tensile modulus at low extension rates. The practical consequence is that a heavy-duty sack film can be down-gauged without changing the converting line if puncture resistance and seal strength are verified. Seal initiation temperature should be measured on the finished film using ASTM F88, because comonomer type influences heat-seal behaviour separately from density.
In three-layer coextrusion, the viscoelastic mismatch between the LLDPE layer and a barrier polymer such as polyamide or EVOH may require rebalancing melt temperature and die pressure. The DOWLEX 2645G layer should be processed at the lower end of its melt-temperature range if the barrier layer requires 220°C or higher, because viscosity mismatch can produce layer-thickness variation and curl. A combining adapter with streamlined flow channels and matched layer velocities is preferred. When the resin is used in a five-layer film with LDPE skins, the LDPE outside layer supplies melt strength and bubble stability, while the DOWLEX 2645G core contributes toughness. The recommended layer ratio is product-specific, not material-specific; converters should determine it by measuring finished film properties rather than extrapolating from monolayer data.
Resin compliance documentation for DOWLEX 2645G may reference food-contact chapters and packaging directives, but a supplier certificate does not replace finished-article migration testing under EU harmonised rules. For packaging sold in the EU, the finished film or container must be tested under Regulation (EU) No 10/2011 using the simulants and time-temperature conditions matching the intended use. The resin manufacturer generally provides a declaration that the base polymer is manufactured in accordance with U.S. FDA 21 CFR 177.1520; the converter must ensure that no additives or processing aids introduce non-listed substances. For heavy-metal and packaging-minimisation requirements, Directive 94/62/EC and RoHS recast 2011/65/EU are referenced in many EU supply agreements. REACH registration under Regulation (EC) No 1907/2006 is managed by the producer.
| Measurement | Standard | Condition or specimen |
|---|---|---|
| Melt index | ISO 1133-1:2022 / ASTM D1238 | 190°C, 2.16 kg |
| Density | ISO 1183-1 / ASTM D792 | 23°C |
| Tensile properties | ISO 527-2 / ASTM D638 | ISO 1A or Type IV specimen |
| Dart impact | ISO 7765-2 / ASTM D1709 | 25 µm monolayer |
| Elmendorf tear | ISO 6383-2 / ASTM D1922 | MD and TD |
| Heat seal strength | ASTM F88 | Seal bar temperature profile |
| Food contact | EU 10/2011 / FDA 21 CFR 177.1520 | Supplier certificate plus finished-article migration |
In production, the largest cause of failed food-contact compliance is not the base pellet but the introduction of recycled or reprocessed material that was not cleared for the same use. Re-grind from the converting floor should be controlled to a defined percentage and monitored by lot. If the converter adds masterbatch, the masterbatch carrier resin and additives must meet the same food-contact and stability requirements.
Under heavy-duty sack production conditions, DOWLEX 2645G is typically extruded on lines with automatic profile control and gauge scanners. The relationship between melt index and melt pressure means that layer-thickness nonuniformity is more often caused by die-lip misalignment or air-ring imbalance than by a shift in melt flow. Operators report that the resin tolerates a wider frost-line variation than high-density film resins, but the bubble should not be allowed to oscillate, because the resulting gauge bands translate into sack failure at the crease. Creep testing of erected sacks under ASTM D2990 or the equivalent ISO creep procedure is used where long-term warehouse stacking is required; short-term burst testing alone may underestimate the effect of continuous load.
For pallet shrink and agricultural film, ultraviolet stabilisation is required if the product is exposed to sunlight, because unstabilised DOWLEX 2645G will undergo photodegradation and lose mechanical strength. The type and amount of UV stabiliser is application-specific and should be compounded or dry-blended under the masterbatch supplier’s guidance. If the grade is ordered without slip or antiblock, film-to-film blocking can occur unless a functional additive package is used. Published data for this specific additive configuration is limited, but converter trials generally establish the required masterbatch levels within the first production run.
When DOWLEX 2645G is compared with higher-density DOWLEX film grades, the density increase above 0.926 g/cm³ can reduce dart impact at low temperature, so cold-climate packaging should be validated with drop tests at the lowest expected distribution temperature. The tie-chain concentration in the amorphous phase is strongly cooling-rate dependent; rapid quenching can freeze in lower crystallinity and improve impact, while slow cooling may yield higher modulus but lower tear. This processing-to-property interaction is why the same pellet can produce different mechanical results on two lines even when their set-point temperatures match.
