| HS Code | 840139 |
| Density | 0.918 g/cm³ |
| Melt Flow Rate 190 C 2 16kg | 0.8 g/10 min |
| Melting Point | 122 °C |
| Vicat Softening Temperature | 102 °C |
| Tensile Strength At Yield | 9.5 MPa |
| Tensile Strength At Break | 17 MPa |
| Elongation At Break | 700 % |
| Flexural Modulus | 220 MPa |
| Shore D Hardness | 45 |
| Brittleness Temperature | -70 °C |
| Environmental Stress Crack Resistance F50 | >1000 h |
| Dart Drop Impact F50 25 µm Film | 120 g |
As an accredited SABIC LLDPE 128CNJ factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SABIC LLDPE 128CNJ is supplied as 25 kg net polyethylene bags on pallets, wrapped and suitable for safe handling. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with SABIC LLDPE 128CNJ resin, palletized and secured for safe transport. |
| Shipping | SABIC LLDPE 128CNJ is a linear low-density polyethylene resin shipped as non-hazardous, non-regulated granules/pellets. Pack in 25 kg bags, jumbo bags, or bulk hoppers. Store under dry, ventilated conditions; protect from moisture and excessive heat during transit. |
| Storage | Store SABIC LLDPE 128CNJ in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep in original sealed packaging to prevent moisture absorption and contamination. Avoid creating dust clouds; use proper grounding to prevent static discharge. Ensure no food products are stored nearby. |
| Shelf Life | Shelf life: Indefinite when stored in original packaging in dry, cool conditions away from direct sunlight and heat. |
In three-layer blown film lines manufacturing heavy-duty industrial sacks, SABIC LLDPE 128CNJ is metered into the core layer at addition levels of 40 wt% to 60 wt% of the total film structure, with the outer skins typically composed of high-density polyethylene for stiffness and surface slip. The resin is characterized by a melt mass-flow rate of 1.0 g/10 min at 190 °C/2.16 kg per ISO 1133-1:2022 and a density of 0.928 g/cm³ per ISO 1183-1:2019. On production-scale lines equipped with 250 mm to 400 mm annular dies and 24:1 to 30:1 L/D grooved-feed extruders, the grade is processed at barrel temperatures from 190 °C to 220 °C, with die gap settings between 1.8 mm and 2.4 mm and blow-up ratio maintained between 2.0:1 and 3.0:1. Internal bubble cooling and dual-lip air rings are used to stabilize the bubble when the line speed exceeds 30 m/min; screw-speed-induced output instability below 15 rpm has been observed to produce gauge bands due to poor melt homogenization at low shear rates, while temperatures above 230 °C intensify oxidative chain scission at die-lip surfaces. Compliance for the structure is aligned to ISO 21898:2004 for sack drop resistance, EN 13592:2017 for refuse sack tear and impact requirements, ASTM D4976-12a for polyethylene film classification, and REACH (EC) No 1907/2006 for registration of compounded additives. Terminal product types include heavy-duty open-mouth sacks for mineral and fertilizer fill, valve sacks for cementitious powders, FIBC liner films, and construction aggregate bags.
For silage bale-wrap and agricultural cover film extrusion, SABIC LLDPE 128CNJ is dry-blended with a polyolefin-based UV-stabiliser masterbatch at addition levels of 2 wt% to 4 wt%, with slip/antiblock concentrate added at 0.1 wt% to 0.5 wt% and the remainder being the base resin; the total additive package must not exceed 5 wt% without a twin-screw pre-compounding step because single-screw distributive mixing on 70 mm to 90 mm blown-film extruders is insufficient to homogenize concentrated stabilizer agglomerates. Processing is conducted on high-stalk blown-film lines with die gaps of 1.8 mm to 2.2 mm, blow-up ratios of 2.5:1 to 3.5:1, and melt temperatures of 200 °C to 220 °C; bubble stability under high-stalk conditions depends on the resin’s broad molecular-weight distribution and is improved by maintaining frost-line height at 2.5 to 3.0 die diameters. Pellets should be purged with dry air at 60 °C for 2 h if stored above 80% relative humidity to prevent surface moisture defects. The relevant agricultural-film test framework includes EN 14932:2018 for bale-wrap stretch performance, ISO 527-3:2018 for machine-direction and transverse tensile properties, ASTM D5748-19 for puncture resistance, and ASTM D882-18 for thin-film tensile testing. Terminal product forms include round-bale stretch wrap, silage cover sheets, greenhouse side-wall film, and temporary mulch barrier film.
Sealant-layer extrusion for laminated flexible packaging requires a balance between seal-initiation temperature, hot-tack strength, and web stiffness during adhesive lamination; SABIC LLDPE 128CNJ is incorporated at 20 wt% to 40 wt% in the sealant blend, with the remaining fraction split between LDPE and a metallocene low-density polyethylene to depress seal initiation while preserving dart-impact strength. The film web is produced on a cast coextrusion line with a 300 mm to 600 mm slot die, chill-roll temperature maintained at 18 °C to 25 °C, air-gap distance of 120 mm to 200 mm, and melt temperature of 230 °C to 250 °C. The higher melt strength of the 1.0 g/10 min resin reduces neck-in and edge-bead formation during draw-down and allows 15 µm to 30 µm sealant webs to be produced without draw resonance. Compliance for direct and indirect food contact structures relies on FDA 21 CFR 177.1520 for olefin polymers used in contact with food, EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm², and REACH (EC) No 1907/2006. Terminal products include dry-food pouches, frozen-food side-gusset bags, liquid liner pouches for bag-in-box packaging, and laminated snack wrappers. The operational boundary for this grade in sealant webs is its higher seal-initiation temperature relative to plastomer-containing sealants; sealing jaws should be set at 120 °C to 140 °C, and dwell time below 0.5 s should be avoided where hot-tack is critical.
On palletizing lines where stretch-hood machine rolls are consumed at 30 to 60 pallets per hour, SABIC LLDPE 128CNJ is formulated at 60 wt% to 80 wt% with 10 wt% to 25 wt% metallocene LLDPE and 5 wt% to 10 wt% LDPE, plus 0.5 wt% to 1.5 wt% slip/antiblock masterbatch; the metallocene fraction is required to raise elongation at break and puncture propagation resistance, while the LDPE fraction controls melt extensibility during high-stalk bubble formation. The film is produced on a high-stalk blown-film line with die gap 1.8 mm to 2.2 mm, blow-up ratio 4.0:1 to 5.0:1, melt temperature 195 °C to 215 °C, and internal bubble cooling combined with oscillating haul-off. Frost-line height is maintained high, typically 1.5 m to 2.0 m above the die, to enhance machine-direction orientation without destabilizing the bubble; deviations of more than ±2 °C in the bubble surface temperature produce asymmetric film gauge and roll coning. Compliance testing for pallet-hood structures uses ISO 527-3:2018 for tensile elongation, ASTM D5748-19 for puncture resistance, ASTM D1922-15(2020) for Elmendorf tear, and ISO 6383-2:1983 for tear propagation in the machine direction. Terminal product types include machine-applied stretch hoods, pallet stabilization sleeves, and top-cover film for weatherproof storage. A limitation of the grade in this application is the increase in stress-whitening when stretched above 120% elongation; pre-stretch units should therefore be limited below that threshold to avoid visible haze bands on the pallet load.
When geomembrane core layers are formulated with 60 wt% to 80 wt% SABIC LLDPE 128CNJ, 15 wt% to 35 wt% high-density polyethylene blow-moulding grade, and carbon black masterbatch dosed to achieve a final carbon black concentration of 2.0 wt% to 2.5 wt%, the resulting sheet combines elevated puncture resistance with environmental stress-crack resistance sufficient for exposed containment liners. The production process is flat-die sheet extrusion with a die gap of 2.0 mm to 3.0 mm, a three-roll calendering stack set at 70 °C to 90 °C, and sheet thickness from 0.75 mm to 2.0 mm; line widths of 6 m to 8 m are typical for geomembrane panels. The melt temperature must not exceed 230 °C, and residence time should remain below 10 min to avoid carbon-black agglomerate formation and oxidative degradation at the die lip. The applicable compliance framework includes GRI-GM13 for high-density polyethylene geomembrane specifications, ASTM D6693-20 for tensile properties of geomembranes, ASTM D5397-20 for notched constant tensile load testing, and REACH (EC) No 1907/2006. Terminal products include landfill capping liners, pond and canal liners, secondary containment basins, and tunnel waterproofing membranes. Published data for this specific formulation configuration is limited for solvent-permeation performance under sustained hydrostatic pressure; therefore, site-specific permeability testing should be commissioned when the liner contains volatile organic liquids.
Collation shrink film production for bottle multipacks and can overwrap uses SABIC LLDPE 128CNJ at 50 wt% to 75 wt% blended with 20 wt% to 40 wt% LDPE and 0 wt% to 15 wt% metallocene LLDPE, with slip additives added at 0.05 wt% to 0.2 wt% as a free-flowing concentrate to tune hot-slip behaviour in shrink tunnels. The film is produced on a three-layer blown-film line with die gap 1.5 mm to 2.0 mm, blow-up ratio 2.0:1 to 2.8:1, and melt temperature of 190 °C to 215 °C; the film is subsequently slit and passed through a hot-air tunnel at 140 °C to 180 °C with residence time of 5 s to 10 s. Insufficient slip concentration causes roll blocking during pre-shrink storage, while excess slip migrates to the film surface and reduces tray-shrink tack on automated packaging machines. Compliance testing follows ASTM D2732-20 for unrestrained linear thermal shrinkage, ISO 14616:1997 for shrink film stress retention, and ASTM D882-18 for film tensile properties. Terminal products include collation film for bottled water packs, carbonated-beverage can multipacks, and paperboard overwrap for cereal cartons. The higher stiffness imparted by the 0.928 g/cm³ density reduces corner burn-through during tunnel shrinkage but raises the minimum shrink temperature relative to a 0.918 g/cm³ blown film grade.
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Polyethylene resin SABIC LLDPE 128CNJ is a butene-copolymer linear polyethylene pellet grade intended for primary blown-film conversion. The grade is specified to a nominal melt flow rate of 1.0 g/10 min when measured at 190 °C under a 2.16 kg load in accordance with ASTM D1238 and ISO 1133-1. The nominal density is 0.928 g/cm³ under ASTM D1505 and ISO 1183-1; this value places the material at the upper boundary of linear low-density polyethylene and imparts a crystalline fraction that raises film stiffness and moisture resistance relative to 0.918 g/cm³ butene-copolymer grades. The grade designation is commonly read as a 1.0 g/10 min melt-flow class with nominal density 0.928 g/cm³, while the suffix identifies the stabilization and surface-additive package. That additive package influences coefficient of friction, blocking, and die-lip deposit formation, and it must be verified against the current SABIC product datasheet because lot-specific loading can shift film-surface performance.
| Property | Nominal value | Test method |
|---|---|---|
| Melt flow rate | 1.0 g/10 min at 190 °C / 2.16 kg | ASTM D1238, ISO 1133-1 |
| Nominal density | 0.928 g/cm³ | ASTM D1505, ISO 1183-1 |
Film properties are not fixed by pellet specification alone. Tensile strength, elongation, tear resistance, dart impact, haze, and gloss depend on film gauge, blow-up ratio, frost-line height, die gap, and melt temperature. Property comparisons between grades are meaningful only when the same film line settings and thickness are used. Published data for this specific configuration is limited; plant-scale qualification on the target line is required before replacing an existing resin in a commercial specification.
Because the density of 0.928 g/cm³ is higher than that of a conventional 0.918 g/cm³ butene-LLDPE film grade, the material displays a shift toward linear medium-density behavior. Crystalline regions are more numerous, oxygen and water-vapor transmission are reduced, and heat-seal initiation becomes more demanding. Sealing jaws may require an increase of 5–10 °C compared with 0.918 g/cm³ film, with the exact delta depending on film gauge, dwell time, and jaw pressure. The material also exhibits higher Vicat softening and lower elongation at break; these changes are not deficiencies but must be included in package-engineering calculations where flexibility and cold-temperature impact are critical.
On a 45 mm single-screw extruder with a 24:1 L/D barrier screw and a 2.0 mm die gap, the grade is processed with a feed section at 165–180 °C, a compression section at 185–200 °C, and a die/adaptor at 190–210 °C. Melt temperature measured at the die lip is maintained between 200 °C and 220 °C. Above 230 °C, the risk of oxidative degradation, gel formation, and odor increases. Prolonged residence time at elevated melt temperature should be avoided, and start-up purges are commonly performed with LDPE to limit thermal exposure of the LLDPE.
Compared with LDPE, this grade has a higher shear viscosity and generates higher die pressure at a given screw speed. Head pressure may exceed typical LDPE values by 10–30% depending on screw condition and die restriction. A melt-pressure transducer immediately upstream of the breaker plate and a continuous melt-temperature probe are recommended to detect screen blinding, gel accumulation, or thermal excursions. On production-scale lines, batch-to-batch variation in melt flow rate of ±0.2 g/10 min can alter die pressure and bubble stability; the pressure reading is therefore more useful than screw-speed indication when controlling film gauge.
Bubble stability is lower than LDPE at similar melt temperature. The frost-line height is commonly set between 6 and 10 times die diameter. Blow-up ratio is generally held at 2.0:1 to 3.0:1. Increasing blow-up ratio orients more polymer in the transverse direction and raises transverse tear strength, while machine-direction tensile strength at break may decline. If the line is equipped with internal bubble cooling, the internal air exchange should initially be minimized to avoid bubble flutter, with external air-ring cooling acting as the primary stability control.
Die gap selection influences toughness in low-melt-flow LLDPE. A die gap of 2.0–2.5 mm is preferred because narrow gaps increase shear heating and may reduce dart impact. Below a die gap of 1.6 mm, melt fracture and gel streaks can appear. Film thickness is typically controlled between 20 µm and 150 µm; below 20 µm, the limited melt strength of this grade may produce bubble instability unless LDPE is added. Where internal bubble cooling is unavailable, reducing haul-off speed or raising frost-line height can stabilize the bubble but often raises film haze.
Blending with LDPE is used to raise melt strength and improve bubble stability. Addition of 10–30 wt% LDPE with a melt flow rate of 0.3–2.0 g/10 min is standard practice when running ultrafine gauge or high blow-up ratios. The LDPE phase reduces blocking and improves optical smoothness, but excessive addition may lower overall film stiffness and moisture resistance. Where stiffness is more important than tear resistance, 10–20 wt% HDPE may be included; this raises modulus and barrier but can reduce dart impact and should be validated on the target film line.
Relative to a nominal 0.918 g/cm³, 1.0 g/10 min butene-LLDPE such as SABIC LLDPE 118NJ, the 128CNJ resin has higher density and therefore higher crystallinity. The practical consequences are a stiffer film, lower oxygen and water-vapor permeability, better machinability on vertical form-fill-seal lines, and a narrower impact/tear balance. Conversely, low-temperature toughness and dart impact are reduced as density increases. The grade should not be used in frozen-food or stretch-hood applications that demand low-modulus, high-elongation behavior unless plant-scale testing demonstrates otherwise.
Comonomer type also controls property limits. Butene is a shorter side chain than hexene or octene and is less efficient at generating stress-transmitting tie chains. At equivalent density and melt flow, butene-copolymer LLDPE typically has lower dart impact, lower Elmendorf tear, and higher heat-seal initiation temperature than hexene- or octene-copolymer grades. In practice, where puncture toughness at low gauge is the primary specification, a hexene or metallocene resin may outperform 128CNJ. However, 128CNJ may provide a wider melt-fracture-free processing window and reduced sensitivity to screw-generated shear heating, which is an advantage on older lines without high-efficiency barrier screws.
Compared with a metallocene-catalyzed LLDPE, 128CNJ has a broader molecular weight distribution and a different branching profile. Metallocene grades generally produce higher dart impact, better optical clarity, and lower seal initiation temperatures, but can increase extruder back-pressure and are more sensitive to die-lip build-up and melt fracture. Existing lines that cannot accommodate high die pressure or that run broad shear-rate variations may therefore retain 128CNJ instead of a metallocene grade. The trade-off is lower ultimate toughness and higher seal initiation, especially in thin films below 40 µm.
Within the same density class, increasing melt flow from 1.0 to 2.0 g/10 min reduces extruder torque and die pressure but lowers dart impact and tear toughness. The 1.0 g/10 min melt flow of 128CNJ is therefore selected where end-use toughness outweighs maximum throughput. Lines with undersized motors, non-barrier screws, or high-output dies may observe an output ceiling because of the higher pressure generated by the resin; this is an operational limitation, not a product defect.
Applications cited in supplier documentation for 128CNJ include heavy-duty sacks, industrial liners, carrier bags, agricultural films, and overwrap where higher stiffness and moisture resistance are valued. In heavy-duty sack applications, the film is often produced at 80–150 µm, gusseted, and welded by impulse or hot-air sealing. The seal strength and creep resistance of 0.928 g/cm³ film are higher than those of 0.918 g/cm³ film, but the seal initiation temperature is also higher. Heat sealing should be performed with an increased jaw temperature of 5–10 °C and sufficient dwell time to melt the crystalline regions; seal strength is measured by ASTM F88.
Films produced from 0.928 g/cm³ LLDPE exhibit lower water-vapor transmission than 0.918 g/cm³ LLDPE of the same gauge, which may permit modest gauge reduction before barrier performance falls below specification. However, the change is small compared with HDPE or polypropylene; 128CNJ is not a barrier resin. Water-vapor transmission should be measured on the final film according to ASTM E96 or ISO 15106-1. Where low coefficient of friction is required for high-speed filling, the surface-additive package may be adequate on some lines; if not, slip masterbatch can be added, but seal strength and print adhesion must then be revalidated. Coefficient of friction is measured by ASTM D1894, and film optical properties are quantified by ASTM D1003 for haze and ASTM D2457 for gloss.
Environmental stress-crack resistance is relevant in agricultural films and industrial liners exposed to wetting agents, detergents, or mineral oils. Testing under ASTM D1693 is recommended when the film is in contact with surfactants. Resistance to alcohols, dilute acids, and aqueous salt solutions is generally similar to that of polyethylene; strong oxidizing acids, aromatic hydrocarbons, and halogenated solvents may cause swelling or stress cracking. Chemical exposure must be validated on the final fabricated article because film orientation, thickness, and seal geometry alter permeation and failure time.
Food-contact eligibility is typically based on FDA 21 CFR 177.1520 and Regulation (EU) No 10/2011 Annex I Table 1 for olefin polymers, provided that the final film passes migration limits and the material is not modified with unapproved masterbatches. Compliance with REACH and RoHS Directive 2011/65/EU is normally addressed through SABIC product stewardship documentation; converters must confirm the current status for their jurisdiction and end-use. This grade is not intended for medical-grade, implant, or pharmaceutical packaging unless specifically qualified by the resin producer and the converter. No statement of universal food-contact compliance should be inferred from pellet specifications alone.
Virgin pellets should be stored in a dry, UV-sheltered silo below 50 °C. Predrying is normally unnecessary in closed silos at relative humidity below 60%. If surface moisture is present from cold-to-warm transfer, a desiccant dryer at 60–70 °C for 2–4 h may be used. Hopper residence time at elevated temperature should not exceed 4 h because surface oxidation can alter color and seal strength. Avoid contamination with polypropylene, polyamide, or acetal; incompatible melt phases produce delamination, gels, and loss of film integrity. Regrind levels above 15 wt% should be validated for color, gel count, and seal performance because the higher density of this grade can concentrate sheared and oxidized material in the melt stream.
