| HS Code | 278089 |
| Product | CSPC LLDPE 2426F |
| Polymer Type | Linear Low Density Polyethylene |
| Physical Form | Pellets |
| Color | Natural |
| Density | 0.924 g/cm³ |
| Melt Flow Rate | 2.4 g/10 min |
| Melting Point | 122 °C |
| Vicat Softening Point | 102 °C |
| Tensile Strength At Break | 38 MPa |
| Elongation At Break | 600% |
| Haze | 7% |
| Gloss 60 | 75 |
| Dart Drop Impact | 130 g |
| Coefficient Of Friction | 0.25 |
As an accredited CSPC LLDPE 2426F factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CSPC LLDPE 2426F is supplied in 25 kg woven polyethylene bags with inner liner, shrink-wrapped on pallets. |
| Container Loading (20′ FCL) | 20' FCL loading of CSPC LLDPE 2426F pellets in 25kg bags, shrink-wrapped and palletized, ensuring secure, dry, and contamination-free transport. |
| Shipping | CSPC LLDPE 2426F is a non-hazardous linear low-density polyethylene resin in pellet form. For transport, it is not regulated as dangerous goods under IMDG, ADR, or IATA. Ship as plastic granules, protecting from moisture and contamination; no special handling restrictions apply. |
| Storage | Store CSPC LLDPE 2426F in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep original packaging sealed to prevent moisture, dust, and contamination. Avoid rough handling that may tear bags. Maintain temperature below 50°C and use within recommended shelf life for optimal processing performance. |
| Shelf Life | Store in original packaging in a cool, dry place away from sunlight and moisture. Shelf life is typically 12 months from manufacturing date. |
In heavy-duty shipping sack conversion, CSPC LLDPE 2426F is dry-blended with a high-pressure LDPE grade such as 2420H at a ratio of 70 wt% to 80 wt% 2426F and 20 wt% to 30 wt% LDPE before entering the hopper of a single-screw blown-film extruder. The screw is specified at 65 mm diameter with a 30:1 L/D ratio and a Maddock mixing section, and the die is a 400 mm spiral mandrel with a 2.0 mm die gap. Melt temperature is held between 195°C and 205°C, while blow-up ratio is kept at 2.2:1 to 2.5:1 and frost line height at 450 mm to 550 mm; film thickness ranges from 120 µm to 180 µm. The principal process conflict is bubble instability when the frost line rises above 600 mm, because the narrow molecular weight distribution of butene LLDPE reduces melt strength relative to LDPE; a fluoropolymer processing aid added at 300 ppm to 600 ppm suppresses melt fracture at the die lip but does not compensate for excessive draw. Edge trim and sack start-up waste are re-fed at up to 15 wt%, provided the recycled fraction is de-gassed and screen packs are changed when die pressure exceeds 320 bar. For mechanical acceptance, finished film is conditioned 40 h at 23°C and 50% relative humidity and tested per ASTM D882 for tensile properties, ASTM D1922 for Elmendorf tear, and ASTM D1709 Method A for dart impact. Sacks are sewn on a bottom-stitch or heat-cut rotary head and filled at 25 kg to 50 kg with granular resin, mineral powders, or fertilizers. Drop testing is conducted to ISO 7965-1, with a minimum of 10 filled sacks surviving 1.2 m drops on the face, edge, and butt. The grade complies with the EU REACH regulation 1907/2006 and the RoHS directive 2011/65/EU for industrial packaging heavy-metal limits. Published data for the specific puncture energy of a 70/30 blend at 150 µm is limited; converters therefore validate each silo batch because butene LLDPE lot-to-lot MFR variation of ±0.2 g/10 min can shift dart impact by more than 10%.
Monolayer extrusion of CSPC LLDPE 2426F at 50 µm thickness produces a haze value of 9% to 14% when measured by ASTM D1003, and a 60° gloss of 50 GU to 60 GU by ASTM D2457. The optical limitation is inherent to the butene comonomer: short-chain branching creates a broad crystallite size distribution that scatters light more than hexene LLDPE or LDPE-rich blends. In practice, frozen-food converters add 15 wt% to 25 wt% LDPE 2420H or a low-haze extrusion-coating LDPE to the core and skin layers of a three-layer blown-film die; this reduces haze to 6% to 9% and raises gloss to 65 GU to 72 GU. The process window is narrow: die gap 1.5 mm, blow-up ratio 2.5:1 to 3.0:1, frost line 300 mm to 350 mm, and melt temperature 190°C to 210°C. When the frost line is moved below 250 mm, the film surface is quenched too rapidly and haze increases by 2% to 3%; when it exceeds 400 mm, bubble flutter creates gauge bands of ±8% that are visually unacceptable on printed packs. The resin is used in form-fill-seal applications because its low-temperature toughness prevents brittle failure at freezer temperatures: brittleness by ASTM D746 is below -60°C, and dart impact at 50 µm remains above 200 g after conditioning at -25°C. Compliance for direct food contact is established under FDA 21 CFR 177.1520 for olefin polymers and EU Regulation 10/2011, with overall migration limits of 10 mg/dm² per EN 1186-1. The terminal product is a printed frozen vegetable or seafood pouch with a back-seam seal and a tear notch; however, 2426F provides no oxygen barrier, so shelf life is determined by the oxygen transmission rate of the polyethylene layer and any EVOH or polyamide core.
Cast stretch film production on a 3-layer slot-die line using CSPC LLDPE 2426F as the core layer places the resin at 70 wt% to 80 wt% of the structure, with metallocene LLDPE skins at 10 wt% to 15 wt% per side and a polyisobutene cling masterbatch at 2 wt% to 5 wt% in the outer skin. The die is 2250 mm wide with a 0.6 mm lip gap, and the chill roll is held at 16°C to 20°C. Melt temperature is set from 245°C to 260°C; temperatures above 260°C initiate oxidation of the butene LLDPE, producing visible gel particles at the die lip and a characteristic brown discoloration. At 23 µm film thickness, line speeds of 350 m/min to 500 m/min are achievable before edge neck-in exceeds 35 mm per side; at 17 µm, draw resonance appears at approximately 450 m/min unless the air knife is positioned within 25 mm of the die exit to stabilize the melt curtain. The core layer is the main contributor to machine-direction elongation and hole resistance; converters measure ASTM D882 tensile elongation at break in the range of 350% to 450%, ASTM D5748 puncture resistance of 20 N to 30 N at 23 µm, and ASTM D5458 cling force of 1.5 N/cm to 3.0 N/cm after 24 h storage at 23°C and 50% relative humidity. The gauge profile is checked by ASTM D5947; target deviation is ±5%, and deviations above ±8% correlate with unwind telescoping in finished rolls. Finished rolls are slit to widths of 250 mm to 500 mm and applied at pre-stretch levels of 200% to 400% on pallet wrappers. The primary operational limitation is that 2426F has lower drawdown than metallocene LLDPE; at 17 µm the film may show thickness-shear bands unless the skin layer melt index is at least 3.0 g/10 min.
A 3-layer coextruded silage wrap line typically operates at 25 µm gauge with a layer ratio of 15/70/15, where the core layer is CSPC LLDPE 2426F at 70 wt% to 75 wt% and the skin layers carry the cling additive, UV stabiliser, and white pigment. The UV package is critical because silage film must survive 12 months of outdoor exposure on wrapped bales; the formulation includes a hindered amine light stabiliser at 0.15 wt% to 0.30 wt%, a benzophenone or triazine UV absorber at 0.10 wt% to 0.25 wt%, and titanium dioxide at 3 wt% to 5 wt% in the white skin to block UV radiation from reaching the core. Cast film is produced with a 2000 mm slot die, 0.65 mm lip gap, melt temperature 215°C to 230°C, and chill roll temperature 18°C to 22°C; pre-stretch is set to 55% to 70% on the bale wrapper. The process conflict is pre-stretch relaxation: if the core layer has insufficient elastic recovery, the wrap loosens and water penetrates. Retention properties are measured by EN 13207:2018, which evaluates tensile elongation and tear after exposure; the film must retain at least 50% of original elongation at break after 1200 h of accelerated weathering per ISO 4892-2 Method A. Cling is measured by ASTM D5458 and must remain above 1.0 N/cm after 24 h on the roll. In the finished product, the standard roll width is 750 mm, length 1500 m, and core 76 mm; the film is applied at 6 to 8 wraps on round or square bales. The limitation of 2426F in this application is that butene LLDPE has lower puncture resistance than hexene LLDPE, so converters using only 2426F in the core must increase film thickness from 25 µm to 30 µm when wrapping bales with sharp stalk ends.
Because the melt index of 2.0 g/10 min is below the 7.0 g/10 min to 10.0 g/10 min range normally selected for extrusion lamination, CSPC LLDPE 2426F is limited to a 20 wt% to 40 wt% let-down in low-speed extrusion lamination of aluminium foil, with the balance supplied by a high-melt-index LDPE extrusion-coating grade. The blend is plastified in a 90 mm extruder with a 30:1 L/D barrier screw and delivered through a 1200 mm slot die at a melt temperature of 290°C to 305°C. The air gap is held at 150 mm to 180 mm; longer gaps cause neck-in beyond 25 mm per side, while shorter gaps reduce the time available for surface oxidation and lower the bond strength. Aluminium foil is pre-treated to a surface energy of 38 mN/m to 42 mN/m by corona or ozone, and the laminate is pressed onto a 15°C chill roll. Coating weight is controlled at 20 g/m² to 35 g/m²; at 20 g/m², the line speed is limited to 80 m/min to 120 m/min because the higher viscosity of 2426F causes draw resonance at higher speeds. Adhesion is measured by ASTM D1876 T-peel at 2.5 N/15 mm to 5.0 N/15 mm; machine direction bond strength is typically higher than transverse because of orientation in the air gap. The laminated foil is converted into sachets and peelable lidding for dry food and pharmaceutical powders; compliance for direct food contact is demonstrated under FDA 21 CFR 177.1520 and EU Regulation 10/2011. A practical constraint is that the foil lamination line must maintain web tension below 0.5% elongation to prevent the LLDPE-rich tie layer from stretching and delaminating after metallization.
For pallet unitization stretch-hood film, CSPC LLDPE 2426F is blended with a metallocene LLDPE and an EVA or ultra-low-density polyethylene to improve puncture and tear resistance at thicknesses between 80 µm and 150 µm. The 2426F fraction is kept at 45 wt% to 60 wt% because higher levels reduce film recovery after the 60% stretch applied by the hooding frame and produce excessive neck-down on the pallet corners. The film is converted on a cast or blown line; in the cast process the die gap is 1.2 mm, melt temperature 210°C to 235°C, and chill roll temperature 18°C to 22°C. In the blown process the blow-up ratio is 3.5:1 to 4.5:1, and the higher transverse orientation improves corner tear resistance but lowers machine-direction elongation. The mechanical acceptance envelope includes tensile yield strength above 12 MPa per ASTM D882, elongation at break above 500%, puncture resistance above 35 N per ASTM D5748, and Elmendorf tear above 15 N in both directions per ASTM D1922. Seal failure is the dominant field complaint; hoods are clipped or impulse-sealed at 130°C to 150°C, and the 2426F-rich layer must not contain more than 0.5 wt% recycled edge trim or the seal becomes brittle at freezer temperatures. The finished hoods are applied by a stretch-hooding machine with 4 corner stretching arms, covering pallets of building materials, beverages, and shrink-wrapped goods. The film is not intended for direct food contact unless the food is packed in primary packaging; industrial compliance is limited to REACH 1907/2006 and RoHS 2011/65/EU for hazardous substances.
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CSPC LLDPE 2426F is a pelletized linear low-density polyethylene resin manufactured at the CNOOC and Shell Petrochemicals Company Limited integrated site in Huizhou, Guangdong Province, China. The grade is intended for blown-film extrusion and is designated within the producer’s product family by the code sequence “2426,” which identifies a nominal density class of 0.924 g/cm³ and a nominal melt mass-flow rate of 2.0 g/10 min; the terminal “F” identifies a film-specific additive and stabiliser package that distinguishes the product from injection-moulding or pipe grades. The polymer is supplied as natural cylindrical pellets with a typical pellet diameter of 3–5 mm and a bulk density suitable for silo storage and vacuum conveying. Primary commercial uses include heavy-duty shipping sacks, consumer carrier bags, agricultural tunnel film, lamination film on BOPP and paper substrates, and industrial liners produced on conventional high-output blown-film lines.
Because the melt mass-flow rate of 2.0 g/10 min is measured under ISO 1133-1:2022 at 190 °C with a 2.16 kg piston load, the resin sits in the lower-flow film-extrusion window; this limits melt pressure at high screw speed while retaining sufficient melt viscosity for bubble stability. Density is determined under ISO 1183-1:2019 after conditioning at 23 °C and 50% relative humidity. On a 65 mm single-screw extruder with a 30:1 L/D barrier screw and a 150 mm spiral mandrel die, the grade is typically started with barrel setpoints from 170 °C in the feed zone to 210 °C in the metering zone and die-zone temperatures of 215 °C to 220 °C. These setpoints are not universal; they must be adjusted for thermocouple placement, die mass, and line speed. Operation above 230 °C increases the risk of oxidative gel formation, even with the film-grade stabiliser package.
The central difference between CSPC LLDPE 2426F and high-pressure LDPE with the same 2.0 g/10 min melt flow class is long-chain branching. High-pressure LDPE contains long-chain branches that produce strain-hardening extensional viscosity and a broader shear-thinning response. CSPC LLDPE 2426F, as a linear-grade polymer, shows lower melt strength and therefore requires a narrower die gap of 0.8–1.2 mm, rather than the 1.5–2.0 mm common for LDPE, to prevent unstable bubble sag. The recommended blow-up ratio for this resin is 2.0:1 to 2.5:1; LDPE may be run at 2.5:1 to 3.5:1 because its melt strength tolerates higher transverse stretching. Compared with C6-LLDPE film grades of equal density, 2426F may exhibit lower dart drop impact and lower Elmendorf tear strength if the short-chain branch length is shorter and tie-molecule concentration is reduced. Published data for the specific comonomer type is limited in public product literature; converters replacing C6-LLDPE in frozen-food or heavy-duty packaging should compare lot-specific certificates and run side-by-side film trials before qualifying the grade. The structural difference is measurable through dart drop impact according to ASTM D1709-16a Method A and Elmendorf tear strength according to ISO 6383-2:2017; however, the producer’s public literature does not provide lot-independent comparative values for 2426F against C6-LLDPE.
The melt mass-flow rate of 2.0 g/10 min is a nominal release value with a producer tolerance typically not exceeding ±0.2 g/10 min for film-grade LLDPE; density is controlled to ±0.001 g/cm³ around 0.924 g/cm³. A density shift of 0.001 g/cm³ corresponds to a measurable change in crystalline fraction and influences film stiffness: increasing density from 0.923 g/cm³ to 0.925 g/cm³ raises secant modulus at 2% strain by approximately 15–30 MPa when tested under ISO 527-3:2018 at 500 mm/min. The melt flow rate determines how fast melt pressure builds in a 25:1 L/D to 30:1 L/D single-screw extruder; a higher value reduces amps and permits lower melt temperature, but a value below 1.5 g/10 min can destabilize high-stalk bubbles at gauge below 25 µm. The resin is therefore specified for medium-gauge films between 30 µm and 120 µm; thinner films may require performance additives or metallocene grades with superior melt strength at low gauge.
| Property | Nominal value | Test standard |
|---|---|---|
| Melt mass-flow rate | 2.0 g/10 min | ISO 1133-1:2022 (190 °C / 2.16 kg) |
| Density | 0.924 g/cm³ | ISO 1183-1:2019 |
| Tensile yield stress, MD/TD | Report lot value | ISO 527-3:2018, 500 mm/min |
| Dart drop impact | Report lot value | ASTM D1709-16a Method A |
| Elmendorf tear strength | Report lot value | ISO 6383-2:2017 |
| Haze / gloss | Report lot value | ISO 14782:2021 / ASTM D2457-21 |
Actual lot-specific values are provided in the certificate of analysis; the matrix above should not be used for release verification without traceable lot data.
Thermal degradation in the die-lip region is the primary processing risk for high-output lines. On a 90 mm extruder running a 250 mm die at a screw speed of 80 min⁻¹ and a die pressure above 300 bar, viscous shear heating can raise the melt temperature 10–15 K above the setpoint in the die land. At 235 °C, low-molecular-weight oxidised species migrate to the die lip and produce a yellow-to-brown deposit after 4–6 h of continuous operation. The deposit disrupts the bubble contact line; thickness bands of ±8% or greater appear in the collapsed film. The deposit is often a mixture of oxidised oligomers and degraded slip/antioxidant components, not necessarily gross polymer melt fracture. Reducing die setpoints by 10 K and purging with a fractional-melt LDPE purge grade at 220 °C for 5–10 min usually removes the fouling. Persistent deposits require line stoppage and manual cleaning with a copper-brass gauze; steel scrapers should not be used on chrome-plated die lips because they create microgrooves that re-initiate fouling. A non-abrasive polyolefin purge compound with a decomposition temperature above 280 °C can be used for severe gel contamination.
Process development for 2426F normally begins with a single-screw extruder having a length-to-diameter ratio of 25:1 to 30:1 and a barrier screw that prevents solid-bed breakup in the compression zone. A die gap of 1.0 mm is selected for films from 40 µm to 80 µm; for gauge below 25 µm, the die gap is reduced to 0.8 mm and the melt temperature is raised to 215 °C to suppress melt fracture at high haul-off speeds. Blow-up ratio is maintained between 2.0:1 and 2.5:1; a high-stalk bubble with a frost-line height of 3–5 die diameters improves orientation balance and gauge uniformity. On a 70 mm extruder with a 250 mm die, chilled air at 10 °C, and a 1.0 mm die gap, a starting output reference for 50 µm film is 180 kg/h; actual output depends on screw geometry, die pressure, and cooling-air humidity. Dual-lip air rings are generally used when gauge variation must remain below ±5%; single-lip air rings may produce ±10% variation at high throughput. The film should be treated with corona discharge to 38–42 mN/m for lamination and print adhesion; untreated film surface energy is typically below 32 mN/m and is insufficient for solvent-based inks.
Film properties are measured on 50 µm specimens produced at a 2.2:1 blow-up ratio and a 40 µm die gap. Tensile yield and elongation are tested under ISO 527-3:2018 at a test speed of 500 mm/min using 15 mm wide strips and a 50 mm gauge length. Dart drop impact is measured under ASTM D1709-16a Method A with a 38 mm diameter dart and 660 mm drop height; Elmendorf tear strength is determined using ISO 6383-2:2017 with a 6400 g pendulum. Machine-direction tear strength is frequently lower than transverse-direction tear strength because the resin is strain-hardened in the machine direction during haul-off; the difference widens when the haul-off ratio exceeds 4:1 or when the frost-line height is below 3 die diameters. The certificate of analysis reports lot-specific values for tensile, dart, and tear parameters; converters requiring guaranteed minimum dart impact for dangerous-goods sacks should specify a minimum value in the purchase specification and validate with the relevant UN packaging test method or national equivalent.
For heavy-duty industrial sacks of 50–70 µm wall thickness, the hot-bar sealing temperature is typically 120–140 °C at a jaw pressure of 0.4 MPa and a dwell time of 0.3–0.5 s. The grade does not contain a high-dosage UV stabiliser; agricultural films that require exposure beyond 12 months should be dry-blended with a PE-based UV masterbatch at 2–4 wt% using a gravimetric feeder at the extruder throat. Masterbatch letdown from a single-disc feeder may vary by ±5% of the set rate and should be calibrated with the target masterbatch pellet geometry. In lamination, corona treatment to 38–42 mN/m and an acrylic or polyurethane adhesive are normally used; the polymer surface cannot be bonded directly to BOPP or PET without surface activation and adhesive.
No pre-drying is required when the resin is stored in unopened bags at 23 °C and 50% relative humidity. Moisture uptake by LLDPE pellets is below 0.01 wt% under these conditions; therefore, hopper dryers are not used for standard blown-film extrusion. Condensation on pellets can occur when cold pellets are transferred into a warm humid plant; a temperature difference greater than 15 K between pellet surface and ambient air may produce surface moisture that leads to splay or small bubbles in the film. In such cases, the pellets should be allowed to equilibrate in silo for 4–6 h before extrusion. Masterbatch addition at 0.5–5 wt% is compatible with a gravimetric screw feeder mounted above the feed throat; colour masterbatches for LLDPE should use a 1.0–2.0 g/10 min carrier resin and should not contain free paraffin oil above 2 wt% because this reduces pellet friction in the feed section. Fluoropolymer processing aids at 200–500 ppm may be used to delay die-lip fouling; the die surface requires 90–120 min of running to condition before the additive reduces melt pressure.
The pellet is not classified as hazardous under Regulation (EC) No 1272/2008. For food-contact film in the European Union, the converted film must meet the overall migration limit of 10 mg/dm² under Commission Regulation (EU) No 10/2011, and the converter must verify that the specific grade lot and downstream additives do not exceed the relevant specific migration limits. For U.S. food-contact applications, the base polymer may be evaluated under FDA 21 CFR 177.1520(c) 3.2a; however, the full film article must be tested under end-use conditions because masterbatches, inks, and coatings are outside the base resin compliance. Under Directive 2011/65/EU (RoHS), the product does not intentionally contain lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, or polybrominated diphenyl ethers above the maximum concentration values; article-level analysis for homogeneous materials is performed according to IEC 62321-5:2013. Under Regulation (EC) No 1907/2006 (REACH), the resin supplier should confirm the absence of substances of very high concern above 0.1% w/w in the pellet.
| Reference | Scope | Typical verification basis |
|---|---|---|
| FDA 21 CFR 177.1520(c) 3.2a | Olefin polymers for food contact | End-use extraction testing per FDA guidance |
| EU 10/2011 | Plastic materials and articles intended for food contact | Overall migration limit 10 mg/dm² |
| RoHS 2011/65/EU | Restriction of hazardous substances in EEE | Homogeneous-material analysis per IEC 62321-5:2013 |
| REACH 1907/2006 | SVHC presence in articles | Notification threshold 0.1% w/w |
Operational boundaries for the resin are defined by melt temperature, screw design, and additive compatibility. The upper processing ceiling is 230 °C for direct extrusion and 250 °C for short-term interruption of less than 15 min; longer hold-up at high temperature increases gel count. The resin is incompatible with strong acid curing agents and with some amine-based slip additives that accelerate antioxidant depletion; additive systems for food-contact film should be selected from prequalified PE masterbatches only. When a line is shut down, a fractional-melt LDPE purge should be used to reduce residual melt in the die and screw; polyolefin purge compounds containing abrasive fillers are not recommended because they can scour barrier screw clearances and increase melt leakage. Cross-polymer contamination with polypropylene or polyamide causes visible gels and delamination in film; therefore silo and feed hopper changeovers should include full draining and purge cycles verified by melt pressure recovery below 0.5 MPa fluctuation.
