| HS Code | 994028 |
| Density | 0.924 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 1.8 g/10 min |
| Tensile Modulus | 260 MPa |
| Tensile Stress At Yield | 10 MPa |
| Tensile Strain At Break | 350% |
| Vicat Softening Temperature | 94 °C |
| Melting Temperature | 111 °C |
| Haze | 9% |
| Gloss 45 | 50 gloss units |
| Coefficient Of Friction | 0.2 |
| Thermal Conductivity | 0.33 W/m·K |
| Dielectric Constant 1 Mhz | 2.3 |
As an accredited Low Density Polyethylene LDPE 2426H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Low Density Polyethylene LDPE 2426H is supplied in 25 kg moisture-resistant polyethylene bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | Low Density Polyethylene LDPE 2426H loaded in 20′ FCL as 25 kg bags on pallets, securely stowed and moisture-protected. |
| Shipping | LDPE 2426H is shipped as non-hazardous thermoplastic pellets in 25 kg bags or 1,000 kg jumbo bags on pallets. Use dry, covered containers or trucks; protect from moisture, heat, direct sunlight, and contamination. No UN dangerous-goods classification; follow standard good-handling and storage practices. |
| Storage | Store Low Density Polyethylene LDPE 2426H in a cool, dry, well-ventilated area away from direct sunlight, heat, ignition sources, and strong oxidizers. Keep original containers closed and off the floor on pallets to prevent moisture and contamination. Avoid prolonged UV exposure and excessive stacking. Maintain stable temperature and good housekeeping; pellets are combustible if dispersed. |
| Shelf Life | Shelf life is typically 24 months from production when stored dry in original unopened packaging, away from direct sunlight and heat. |
At a nominal MFR of 2.2 g/10 min under ISO 1133-1:2022 and a density of 0.923 g/cm³ under ISO 1183-1:2019, LDPE 2426H is run on single-layer tubular film lines producing 180 µm heavy-duty sacks for filled polymer powders and mineral concentrates. The resin is extruded through a 400 mm die with 1.7 mm land gap on a 75 mm grooved-barrel extruder at L/D 30:1. Melt temperature at the adapter is held at 198°C–206°C and output is 320 kg/h; the bubble is set at BUR 2.6:1 with the frost line held at 6 die diameters above the air ring lip. The formulation contains 2.5 wt% of a 40 wt% carbon black masterbatch, 0.6 wt% of a 60 wt% synthetic silica antiblock masterbatch, and 0.2 wt% erucamide slip masterbatch. Film-to-steel COF measured by ISO 8295 is 0.32–0.38. Dart impact on 180 µm film according to ASTM D1709-16a Method A is 210–250 g after addition of 15 wt% C4-LLDPE, whereas unmodified 2426H at the same gauge typically gives 150–180 g. Elmendorf tear by ASTM D1922-15 is 7–9 N/mm MD for the blend and 5–6 N/mm for 100% 2426H. At gauge collapse below 120 µm, dart impact of the unmodified film drops to 60–80 g, and the film is not qualified for filled sacks above 25 kg. Screw-tip back pressure at 320 kg/h is 28–34 MPa; operation above 35 MPa triggers melt-pressure oscillation and visible sharkskin on the inner bubble surface. Final sacks are used for export palletised polyethylene, calcium carbonate, and pre-blended rubber fillers.
| Blow-up ratio | Frost line height (die diameters) | Dart impact Method A (g) | MD Elmendorf tear (N/mm) |
|---|---|---|---|
| 2.0 | 4 | 140–160 | 5.2–6.0 |
| 2.6 | 6 | 210–250 | 7.0–9.0 |
| 3.2 | 8 | 175–190 | 8.1–9.5 |
Pallet-hood structures based on 2426H are run on a three-layer line with die diameter 600 mm, die gap 1.3 mm, and BUR 4.2:1; the frost line is set at 2.5 die diameters to quench transverse orientation rapidly. The composition is 70 wt% 2426H, 25 wt% C6-LLDPE, and 5 wt% mLLDPE; barrel set points from feed to adapter are 160°C, 175°C, 190°C, 195°C, and die 195°C. At 160 µm and layflat widths of 2.0–4.2 m, transverse shrinkage after 10 min at 130°C measured by ISO 14616 is 16–20%, while machine-direction shrinkage is 2–4%; transverse shrink force is 12–15 N/15 mm. The formulation omits slip agents and carries only 0.15 wt% synthetic silica antiblock; film-to-film COF under ISO 8295 remains 0.55–0.65, which prevents hood sliding on stacked PET preform pallets. If BUR is raised above 4.5:1 without increasing die gap to 1.5 mm, gauge bands appear and transverse thickness variation exceeds ±10%. Below BUR 3.5:1, transverse shrinkage falls below 10% and the hood fails to lock under the pallet edge. Heavy-metal compliance under EU 94/62/EC is maintained with masterbatch raw materials having Cd, Pb, Hg, and Cr(VI) in total below 100 mg/kg. Finished hoods are applied to export pallets of PET preforms and orientated strand board.
For a 180 µm single-layer greenhouse covering, 2426H is dry-blended with 6.0 wt% of a UV masterbatch containing 10 wt% HALS and 2 wt% benzotriazole UV absorber in LDPE carrier, plus 1.2 wt% of a sorbitan-ester anti-fog masterbatch. The extruder is 70 mm with L/D 28:1, die 250 mm, die gap 1.6 mm, BUR 2.4:1, and melt temperature 190°C–195°C. Elongation at break of the unstabilised resin under ISO 527-3 is 550%; after 6,000 h QUV-B exposure per ISO 4892-3, the stabilised film retains 300–350%. EN 13206 durability requires at least 50% elongation retention for southern European sites. If UV masterbatch is reduced below 4.0 wt%, carbonyl index rises above 0.1 within 18 months and the film fails year-one certification. Anti-fog performance measured by cold-fogging under EN 13206 Annex C reaches grade A for 60 day cycles at 5°C night and 25°C day; above 30°C daytime operation, antifog persistence drops to 30–35 days unless the masterbatch is raised to 2.0 wt%. The finished film is installed in continuous tunnel spans of 8,000–10,000 m². The same stabilised film is unsuitable for direct silage contact if the sorbitan-ester additive is present because migration into silage liquor has not been cleared under food-contact legislation.
A tandem extrusion coating line processing UHT carton board with 2426H at 400 m/min deposits the resin at 18 g/m² through a 1.2 mm slot die with 230 mm air gap. Die melt temperature is 315°C–320°C; below 290°C adhesion to the tie layer becomes inconsistent and pinholing appears after creasing the coated board cross-direction. Screw-tip pressure is 32–38 MPa, and neck-in from the 900 mm die is 45–55 mm per side. The resin is run without slip or antiblock to keep the food-contact surface migration-free. Compliance with Regulation (EU) No 10/2011 requires overall migration below 10 mg/dm² in 3% acetic acid and 50% ethanol simulants. If erucamide is introduced into the coating blend, its specific migration limit is 2 mg/kg; standard extrusion-coating formulations using 2426H therefore omit amide slip. Coverage under FDA 21 CFR 177.1520(c) applies to room-temperature end use. Peel adhesion measured by ASTM F904-16 is 3.5–4.0 N/15 mm on pre-corona-treated paperboard and 4.5–5.5 N/15 mm on aluminium foil after lamination. The same line with 2426H at 18 g/m² produces release-liner base film for silicone coating and printed soap wrapper laminates. At melt temperatures above 325°C, gel particles increase in the coating and are detected as visual defects above 0.4 mm at a defect density of 1–2/m²; sustained operation above 330°C is avoided because low-molecular-weight oxidation products raise organoleptic failure risk on cartonstock.
2426H is processed on a single-station extrusion blow moulder with 45 mm screw, L/D 24:1, and 0.8 mm die gap for 50–250 mL eye-drop and physiological saline bottles. Barrel zones are 150°C, 160°C, 165°C, and 170°C; head and die temperatures are 172°C; melt temperature by needle probe is 176°C–180°C. Because the MFR of 2426H is 2.2 g/10 min under ISO 1133-1, parison sag limits the unsupported parison length to 130 mm for a 100 mL bottle at 0.08–0.12 MPa extrusion pressure. Above 250 mL capacity, wall-thickness variation exceeds ±15% and the pinch-off tail develops leak paths. Mould temperature is 12°C–15°C, and blowing pressure is 0.35 MPa. The resin is used without slip or antiblock. Plastic packaging compliance is evaluated under FDA 21 CFR 177.1520 and USP 661.1 for extractables. Finished bottles are pressure-tested at 20 kPa internal air pressure, with the reject limit at 0.5 mL/min leakage. Autoclaving is not specified above 110°C because the Vicat softening point of 2426H is 94°C under ISO 306/A50.
For a 50 wt% carbon black masterbatch, 2426H is dosed at 49 wt% with 1 wt% processing stabiliser in a co-rotating twin-screw extruder of 58 mm screw diameter and L/D 40:1, with a vacuum vent at 22 kPa absolute. Barrel set points from feed to die are 140°C, 150°C, 160°C, 165°C, 170°C, 170°C, 168°C, 165°C, 160°C, and 150°C; specific mechanical energy input is 0.18–0.22 kWh/kg. Dispersion measured on a 25 µm screen pack shows a pressure rise of 1.2–1.6 bar after 15 min; replacement with a carrier of MFI below 1.0 g/10 min raises this pressure rise by 40–60% at the same screw speed. The finished masterbatch is added at 5–6 wt% in geomembranes and corrugated drainage pipe. Compliance under REACH Annex XVII entry 23 requires Cd below 100 mg/kg in the final masterbatch; carbon black feedstock is selected to limit benzo(a)pyrene below 1 mg/kg in the masterbatch. When the concentrate is let down in 2426H blown film above 7 wt%, film dart impact decreases by 20–30%, and the masterbatch is considered unsuitable for thin-gauge high-clarity film.
Short-cycle injection moulding of tamper-evident plug closures and flexible vial caps from 2426H is confined to low-pressure tools with clamp force below 800 kN. The resin is moulded at 190°C–210°C with mould coolant at 8°C–12°C; post-mould shrinkage after 24 h is 1.5–2.0% under ISO 294-4. A 64-cavity hot-runner tool running 7 s cycle time produces 20 mL unit-dose vial closures. When gate diameters fall below 0.6 mm, shear heating raises local melt temperature and increases gate blush, although published data for this specific configuration is limited. Food-contact status is covered by FDA 21 CFR 177.1520, and migration testing in olive oil and 50% ethanol is conducted under EU 10/2011. Long-term creep at 40°C under ISO 899-2 exceeds 2.5% after 1,000 h at 3 MPa; this precludes use in carbonated beverage closures where CO₂ loss through the LDPE matrix exceeds barrier requirements. The closures are used for non-carbonated unit-dose pharmaceutical vials and dental rinse cups.
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Low Density Polyethylene LDPE 2426H is a high-pressure free-radical homopolymer supplied in pelletized form for blown film extrusion and selected cast film structures. The grade is specified with a nominal density of 0.924 g/cm³ when tested under ISO 1183-1:2019 and a nominal melt mass-flow rate of 2.0 g/10 min when determined at 190 °C and 2.16 kg load according to ISO 1133-1:2022. This combination places the resin in the medium-melt-flow segment of high-pressure LDPE film grades, where bubble stability, film optics, and seal initiation remain balanced. In comparison with butene-based LLDPE film resins of similar density, LDPE 2426H exhibits higher melt strength due to long-chain branching; however, tensile strength at break under ISO 527-3:2018 and dart impact under ASTM D1709A are typically lower than those of a 0.920 g/cm³ LLDPE film grade. The material is therefore specified for general-purpose packaging, agricultural film, heavy-duty sacks, and coextruded skin layers where optical clarity, stable bubble geometry, and acceptable seal performance govern the selection rather than extreme puncture resistance or aggressive down-gauging. The base resin is not inherently formulated with slip or antiblock additives; converters typically meter erucamide, oleamide, silica, or talc concentrates into the feed throat to control coefficient of friction and blocking in wound rolls. In addition, the grade is not supplied with a UV stabilization package for long-term outdoor exposure; carbon black masterbatch or hindered amine light stabilizer concentrates are compounded or dry-blended at the converting stage for agricultural service.
On production-scale blown film lines, LDPE 2426H is processed on single-screw extruders with L/D ratios between 25:1 and 30:1, using die gaps from 0.8 mm to 1.2 mm. The barrel temperature profile is generally ramped from 160 °C in the feed zone to 190 °C at the adapter, and the melt temperature at the die exit is held between 170 °C and 190 °C. Below 160 °C die-exit temperature, the resin enters a high-viscosity regime that promotes melt fracture at the die lip and bubble instability; on-line this appears as chevron patterns, visible weld lines, and cyclical gauge variation. Above 220 °C, the high-pressure LDPE backbone becomes increasingly susceptible to oxidative chain scission and crosslinking in long residence-time sections, producing gel specks, die-lip plate-out, and color shifts. The stable blow-up ratio window lies between 2.0:1 and 3.0:1; at ratios above 3.5:1, bubble wandering and poor roll conformation are frequently observed. Frost line height is commonly maintained at 5 to 10 die diameters to balance bubble stability and haze. In high-output lines where air-ring cooling limits throughput, production-scale experience indicates that extruder torque is not the primary constraint for this grade; the maximum stable take-off speed is typically determined by the heat-transfer capacity of the cooling system and the collapsing-frame geometry. Pre-drying is not normally required at ambient storage humidity below 60 % relative humidity, but surface condensation from cold-to-warm transfer should be removed before the feed hopper to avoid screw slippage and feed-bridge formation.
Lot-to-lot variation in antioxidant content of LDPE 2426H is controlled to maintain color and melt stability during repetitive processing. The polymer is typically supplied under a food-contact compliance statement referencing FDA 21 CFR 177.1520 and EU Regulation No 10/2011 for olefin polymers in food-contact applications. Final multilayer structures remain subject to end-use migration testing because overall compliance depends on tie resins, pigments, printing inks, and the specific food simulants and time-temperature exposure conditions. For agricultural film, converters incorporate carbon black masterbatch at 2.0 to 3.0 wt% to obtain multi-season weathering resistance; without this ultraviolet stabilizer package, prolonged outdoor exposure leads to embrittlement within a few months. For film-to-film slip, erucamide or oleamide masterbatches are dosed at 0.05 to 0.15 wt%, while silica or talc antiblock concentrates are used at 0.1 to 0.3 wt% depending on gauge and rewinding tension. The resin should not be processed in contact with copper alloys because copper ions can catalyze oxidative degradation at melt temperature; stainless-steel or ceramic-coated die surfaces and screen packs are preferred to reduce catalytic decomposition. At the extruder feed, a grooved-feed throat with forced cooling is recommended to prevent premature pellet bridging and feed-zone melting; barrel temperatures in the first zone should remain below 140 °C when high regrind content is present.
LDPE 2426H is introduced into coextruded structures when the processing stability of the primary LLDPE or mLLDPE layer is limited by low melt strength and bubble instability. In a three-layer A/B/C film, a 10 % to 20 % skin-layer fraction of LDPE 2426H can widen the bubble-stability window by increasing the total melt strength of the combined film at the die. The performance trade-off is measurable. At equivalent 40 µm film thickness, a monolayer LDPE 2426H film typically exhibits a dart impact value below 100 g under ASTM D1709A, whereas a butene-based LLDPE film of 0.920 g/cm³ density and 1.0 g/10 min MFR commonly exceeds 120 g. Tensile strength at break in the machine direction for LDPE 2426H is commonly 15 to 18 MPa under ISO 527-3:2018, while butene LLDPE of comparable thickness may reach 25 to 30 MPa. These differences restrict monolithic LDPE 2426H in high-puncture packaging such as pallet-stretch hoods and down-gauged heavy-duty sacks. In blend form, LDPE 2426H is used at 20 % to 30 % by mass with LLDPE to improve bubble cooling and reduce melt fracture while retaining most of the tensile advantage of the linear resin. Published data for the effect of higher LDPE addition on seal initiation temperature in this specific grade is limited; pilot-line sealing trials are recommended before commercialization of high-speed packaging lines because jaw pressure, dwell time, and film thickness materially affect hot-tack behavior.
The nominal property profile of LDPE 2426H reported in grade-specific technical datasheets is summarized below. The values are typical lot averages and are not to be interpreted as sales specifications; individual certificates of analysis may list different intervals depending on manufacturing campaign and test-sample preparation.
| Property | Test method | Nominal value |
|---|---|---|
| Density at 23 °C | ISO 1183-1:2019 | 0.924 g/cm³ |
| Melt mass-flow rate 190 °C/2.16 kg | ISO 1133-1:2022 | 2.0 g/10 min |
| Tensile strength at break, machine direction, 40 µm film | ISO 527-3:2018 | 15.0 MPa |
| Tensile strength at break, transverse direction, 40 µm film | ISO 527-3:2018 | 14.0 MPa |
| Elongation at break, machine direction | ISO 527-3:2018 | 500 % |
| Elongation at break, transverse direction | ISO 527-3:2018 | 600 % |
| Vicat softening point A/50 | ISO 306:2022 | 92 °C |
| Haze, 40 µm film | ASTM D1003-13 | 8 % |
Mechanical values are obtained on conditioned film samples after 40 h at 23 °C and 50 % relative humidity under ISO 291. The difference between machine-direction and transverse-direction tensile strengths is influenced by the blow-up ratio and frost-line height; lower anisotropy is typically achieved at blow-up ratios closer to 3.0:1. Haze values below 10 % make the grade technically acceptable for display packaging, but the absence of an inherent antiblock package must be managed to prevent blocking in rolls stored above 30 °C. When the film is drawn below 30 µm, optical quality becomes more sensitive to gel count and die-lip plate-out; these are controlled through stable melt temperature, frequent die-lip cleaning, and minimal residence time at high temperature.
In cast film and extrusion coating, LDPE 2426H is used less frequently than in blown film because its melt strength and high draw stability are less critical in chill-roll quench processes. In extrusion coating onto paper or aluminum foil, the resin can be processed at melt temperatures of 280 to 310 °C for adhesion and oxidation, but at these temperatures the residence time must be minimized. The neck-in and draw resonance boundaries of this grade in cast film are not widely published; line trials are required to determine the maximum draw ratio before edge instability. Compared with LDPE coating grades of higher melt flow index, LDPE 2426H may require higher melt temperature or a reduced coat thickness uniformity window. Published data for the specific grade in extrusion coating is limited.
Heat-seal performance of LDPE 2426H is governed by seal-bar temperature, dwell time, and pressure. In monolayer film, the seal initiation temperature is typically reported by converters in the range 95 to 105 °C for 40 µm film at 0.3 MPa jaw pressure and 0.5 s dwell, but published data for this specific grade is limited; converters must verify hot-tack values under ASTM F1921 and seal strength under ASTM F88 on their own structures. Film blocking in rolls stored above 30 °C is a known failure mode when the film is produced without antiblock; this is particularly acute in tropical or high-altitude warehouses. In such cases, a minimum antiblock level is required, and roll winding tension should be reduced to avoid telescoping and blocking.
LDPE 2426H is supplied as translucent pellets with a bulk density commonly in the range 0.48 to 0.52 g/cm³. Pellets should be stored in a dry, ventilated area below 50 °C and shielded from direct sunlight. The resin is not hygroscopic, and pre-drying is unnecessary at relative humidity below 60 %; however, condensation from cold-to-warm transitions must be removed. At processing temperatures above 240 °C, residence time should be kept below 10 min to limit oxidative gel formation; at 260 °C, free-radical degradation becomes rapid and may generate acrid fume. In pneumatic conveying, pellet fracture caused by high air velocity above 25 m/s can generate fines that produce visual defects in thin-gauge film. The grade should not be blended with high levels of acid-containing additives or certain copper-based colorants unless the masterbatch has been tested for oxidative compatibility at the intended melt temperature. When restarting a blown film line after shutdown, purging with a higher-MFR LDPE or a commercial purging compound is recommended before reintroducing LDPE 2426H to prevent carbonized residues from contaminating the die lips.
