| HS Code | 835425 |
| Melt Flow Rate 190 C 2 16 Kg | 0.8 g/10 min |
| Density | 0.924 g/cm³ |
| Melting Point Dsc | 124 °C |
| Vicat Softening Point A50 | 110 °C |
| Brittleness Temperature | -80 °C |
| Tensile Stress At Yield Md | 12 MPa |
| Tensile Stress At Yield Td | 11 MPa |
| Tensile Stress At Break Md | 40 MPa |
| Tensile Stress At Break Td | 30 MPa |
| Elongation At Break Md | 500 % |
| Elongation At Break Td | 700 % |
| Elmendorf Tear Strength Md | 8 g/µm |
| Elmendorf Tear Strength Td | 15 g/µm |
| Dart Drop Impact F50 | 130 g |
As an accredited SABIC LLDPE 319BJ factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SABIC LLDPE 319BJ supplied as 25 kg polyethylene bags on pallets, wrapped and UV-protected, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL): SABIC LLDPE 319BJ loaded as 800 × 25kg net bags, totaling 20 MT per 20-foot container. |
| Shipping | SABIC LLDPE 319BJ is a non-hazardous linear low-density polyethylene resin supplied as free-flowing pellets. Ship in clean, dry containers or FIBCs; protect from moisture, direct sunlight, and excessive heat. Avoid contamination and use sealed packaging to maintain product quality during transit. |
| Storage | Store SABIC LLDPE 319BJ in a dry, clean, well-ventilated area, preferably indoors and in its original, unopened packaging. Avoid direct sunlight, heat, moisture, and excessive humidity. Keep away from ignition sources and oxidizing materials. Protect pellets from mechanical damage and dust accumulation. Under proper conditions, shelf life is typically several years. |
| Shelf Life | Shelf life is indefinite if stored in original packaging, away from heat, moisture, and direct sunlight. |
On blown film lines configured for agricultural silage cover and bale wrap production, SABIC LLDPE 319BJ is processed as a monolayer in which the resin is let down with a carbon-black/UV-stabilizer masterbatch. A representative formulation is 85.0 wt% 319BJ and 15.0 wt% LDPE-carrier masterbatch, with letdown adjusted between 12.0 wt% and 18.0 wt% depending on UV absorber package and final film gauge. The processing window on a 65 mm barrier-flight single-screw extruder with L/D 30 and a 250 mm spiral mandrel die calls for melt temperature 190°C–210°C, die pressure 28–35 MPa, blow-up ratio 2.2:1–2.5:1, frost line height 450–650 mm, and dual-lip air ring chilled air at 8°C–12°C. At 150 µm gauge, mechanical properties are tested according to ISO 527-3, ASTM D1003, and ASTM D1709 Method A; silage film conformity to EN 13207 requires notch-tear resistance and oxygen permeability testing per ASTM D3985 at 23°C and 0% RH. In extrusion trials, bubble instability appears as gauge bands outside ±5% when the frost line height is allowed to drift above 650 mm, because the butene LLDPE branch structure exhibits lower melt strain hardening than LDPE. The same loss of strain hardening requires the air ring to be set with a lower lip aperture of 1.5–2.0 mm to avoid excessive draft in the melt cone. For agricultural end use, REACH SVHC screening applies; EU Regulation No 10/2011 compliance is required only when the film is used as a food-contact liner. The masterbatch carrier must be pre-dried at 60°C for 2.0 h when storage RH exceeds 60% to avoid moisture-induced bubble instability.
When a three-layer blown film structure places SABIC LLDPE 319BJ as the sealant layer, the layer distribution is typically 20.0 wt% sealant, 60.0 wt% core, and 20.0 wt% skin for a 60 µm film. The sealant blend comprises 85.0 wt% 319BJ and 15.0 wt% ethylene-octene plastomer with density 0.902 g/cm³ per ISO 1183-1. Melt temperature for the sealant extruder is held at 185°C–205°C and die temperature at 200°C–210°C; higher temperatures accelerate plastomer degradation and generate gel particles. Seal initiation temperature is assessed on a laboratory heat sealer per ASTM F2029 at 0.275 MPa jaw pressure and 1.0 s dwell, with upper jaw temperatures ramped from 90°C to 130°C in 5°C increments. Hot tack is measured per ASTM F1921 at 100°C–120°C; the observed failure mode is seal delamination rather than film tearing. The resulting flexible film is used for frozen food bags and snack packaging. Food-contact compliance falls under FDA 21 CFR 177.1520(c) and EU Regulation No 10/2011, with overall migration below 10.0 mg/dm² under test condition OM2. A practical boundary is that the sealant extruder must not remain above 220°C for more than 20 min during shutdown, because crosslinked gel particles form in stagnant resin and later detach as visible specks. Published data for this specific film configuration is limited; seal initiation values should be verified against the lot certificate of analysis and converted with DSC heat seal curves.
The process-side setpoints below are drawn from converter equipment bulletins and are not grade-intrinsic properties. Lot-specific melt flow rate and density are determined by ISO 1133-1 and ISO 1183-1.
| Parameter | Blown Film | Cast Stretch Film | Extrusion Coating |
|---|---|---|---|
| Die gap | 1.8–2.2 mm | 0.45–0.55 mm | 0.8 mm slot die |
| Melt temperature | 190–210°C | 230–250°C | 285–315°C |
| Cooling medium / setpoint | dual-lip air ring 8–12°C | polished chill roll 22–28°C | matte chill roll 12–15°C |
| Air gap / frost line | BUR 2.2:1–2.5:1, frost line 450–650 mm | 18–25 mm | 150–200 mm |
| Typical line speed | 30–60 m/min at 150 µm | 400–600 m/min at 17–20 µm | 150–300 m/min at 18–25 g/m² |
| Testing point | tensile ISO 527-3, dart ASTM D1709 | cling ASTM D5458, haze ASTM D1003 | adhesion ISO 11339, barrier ASTM D3985 |
A five-layer cast stretch film line running SABIC LLDPE 319BJ in skin layers blends the resin with LDPE to control neck-in and maintain cling layer compatibility. The skin feed uses 70.0 wt% 319BJ and 30.0 wt% LDPE with melt index 2.0 g/10 min; the core runs 100.0 wt% 319BJ or a mix with reincorporated edge trim. Extruder sizes are typically 90 mm for skin layers and 120 mm for core layers, with a flat die gap of 0.5 mm, air gap 18–25 mm, and chill roll temperature 22°C–28°C. Melt temperature is maintained at 230°C–250°C, and line speed reaches 400–600 m/min for 17–20 µm finished film. Physical testing includes elongation at break per ISO 527-3 and cling force per ASTM D5458; haze is monitored per ASTM D1003 because die buildup on the skin layer produces surface defects. The end product is machine pallet wrap for load unitization. Industrial end-use does not require FDA clearance; REACH SVHC screening applies. Low melt temperature below 200°C increases die lip buildup and edge bead instability; periodic die lip cleaning with brass tools is required to maintain optical quality.
Cyclic packing pressures in FIBC inner liners impose flex-crack and creep demands that are addressed on three-layer blown film lines using SABIC LLDPE 319BJ as the inner contact layer. A representative structure comprises 40.0 wt% 319BJ inner layer, 30.0 wt% recycled trim core, and 30.0 wt% LDPE outer layer. The line is configured with a 75 mm extruder, a 300 mm die, die gap 2.0–2.5 mm, BUR 2.0:1, frost line height 400–550 mm, and melt temperature 180°C–200°C. Finished film thickness is 180–200 µm. End products include valve sacks for polymer pellet filling and FIBC inner liners. Dart impact is tested per ASTM D1709 Method A, tear resistance per ISO 6383-2, and FIBC cyclic integrity per ISO 21898. Compliance for food-contact polymer liners falls under FDA 21 CFR 177.1520; UN certification is handled on the outer FIBC as a 13H2 package. Peel strength of 319BJ against unprimed polypropylene fabric is below 0.5 N/15 mm; a tie coat or corona treatment above 42 dynes/cm is needed to reach 2.0 N/15 mm per ISO 11339. Published data for this specific three-layer structure is limited; converter trials should be run with lot-specific melt flow data.
On a 90 mm single-screw extrusion coating line with L/D 30 and barrier screw, SABIC LLDPE 319BJ is fed as neat resin or as an 85.0 wt%/15.0 wt% blend with LDPE for draw resonance control. Melt temperature is maintained at 285°C–315°C, die gap is set at 0.8 mm, air gap 150–200 mm, and chill roll temperature is held at 12°C–15°C. Coating weight ranges from 18 g/m² to 25 g/m² on corona-treated paperboard with surface energy 40 dynes/cm or higher. Adhesion is tested by peel per ISO 11339; oxygen barrier is verified by ASTM D3985. The end product includes paperboard trays and cupstock laminates. Food-contact compliance falls under FDA 21 CFR 176.170(c) and EU Regulation No 10/2011, with overall migration below 10.0 mg/dm². At melt temperatures exceeding 315°C, oxidative gel particles accumulate at the die lip within 8.0 h; a nitrogen blanket in the feed throat reduces gel formation, and die lip cleaning must be scheduled every 8.0–12.0 h during continuous campaigns. Draw resonance on low-gauge coatings appears as bars perpendicular to machine direction and is suppressed by increasing LDPE content to 20.0 wt% or by reducing air gap below 150 mm.
Compliance and test method designations referenced across the downstream segments are consolidated below; lot-specific resin certification remains the overriding document for food-contact and SVHC declarations.
| Application segment | Food-contact framework | Mechanical/barrier test method | Processing test method |
|---|---|---|---|
| Agricultural silage cover | REACH SVHC; EU 10/2011 only for food contact | ISO 527-3, ASTM D1003, EN 13207, ASTM D3985 | ISO 1133-1, ISO 1183-1 |
| Coextruded sealant layer | FDA 21 CFR 177.1520(c), EU 10/2011 OM2 | ASTM F2029, ASTM F1921 | ISO 1133-1, ISO 1183-1 |
| Cast stretch pallet wrap | REACH SVHC | ISO 527-3, ASTM D5458, ASTM D1003 | ISO 1133-1 |
| Heavy-duty sack liners | FDA 21 CFR 177.1520, UN 13H2 outer | ASTM D1709, ISO 6383-2, ISO 21898, ISO 11339 | ISO 1133-1 |
| Extrusion coating on paperboard | FDA 21 CFR 176.170(c), EU 10/2011 | ISO 11339, ASTM D3985 | ISO 1133-1 |
| Reprocessed trim pellets | REACH Article 33 | ISO 1133-1, ISO 1183-1 | Screen pack pressure rise |
Reincorporation of edge trim at 30.0 wt% demands a co-rotating twin-screw extrusion line with side feeding and vacuum devolatilization. The compounding process blends 70.0 wt% virgin SABIC LLDPE 319BJ with 30.0 wt% compacted film edge trim from slitter operations. Extruder parameters include 50 mm screw diameter, L/D 40, barrel temperature profile 160°C–210°C, screw speed 300–400 rpm, and specific energy input 0.20–0.28 kWh/kg. Melt filtration uses a 200 µm screen pack, and vacuum devolatilization is held at −0.08 MPa to strip residual moisture and low-molecular-weight volatiles. Pelletized output is used for non-food heavy-duty film and agricultural film. Quality control includes melt flow rate by ISO 1133-1 Method A, density by ISO 1183-1, and screen pack pressure rise; a pressure rise above 0.5 MPa per hour indicates excessive gel contamination. Compliance requires REACH Article 33 SVHC disclosure for the recycled fraction; food-contact reuse under EU Regulation No 10/2011 is excluded unless full chain-of-custody documentation is available. Edge trim moisture above 0.05 wt% causes screw feeding instability; trim is pre-dried at 70°C for 2.0 h in a desiccant dryer.
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SABIC LLDPE 319BJ is a linear low density polyethylene blown-film resin supplied in pelletized form. The nominal density is 0.919 g/cm³ when measured in accordance with ASTM D1505, and the nominal melt flow rate is 1.0 g/10 min at 190 °C/2.16 kg under ASTM D1238 or ISO 1133-1:2022. The grade is intended for monolayer and coextruded film structures in which a low melt-flow index contributes to bubble stability, puncture resistance, and seal strength. The 1.0 g/10 min rheology limits the resin to blown-film and selected cast-film operations; the material is not positioned for injection molding or profile extrusion because the high melt viscosity would require melt temperatures outside the supplier’s processing envelope. Published technical literature associates the BJ suffix with a formulated additive package for surface slip and blocking resistance, but the exact additive loadings must be confirmed against the lot-specific certificate of analysis.
Grades carrying the BJ suffix in the SABIC LLDPE range are typically formulated with surface-modifying additives. Antiblock particles increase surface roughness and reduce blocking force after winding, but the same particles can increase haze and reduce gloss if the dispersion is poor. The relationship between additive loading and optical character is measured under ASTM D1003-21 and ASTM D2457-19. For flexible packaging, a post-corona wetting tension of 38–42 mN/m is a common acceptance window determined by ASTM D2578-23. Values outside this range may indicate additive bloom, condensation, or excessive oxidation of the film surface. SABIC LLDPE 319BJ pellets do not require drying under typical warehouse conditions, but cold outdoor storage followed by immediate feeding can introduce surface moisture into the feed throat and generate melt-pressure fluctuation or bubble instability. The resin should be allowed to reach ambient feed temperature before startup when the hopper has been exposed to temperatures below 5 °C.
Comonomer distribution in SABIC LLDPE 319BJ is not expressed as a single numeric value in public technical datasheets. The density of 0.919 g/cm³ indicates a moderate short-chain branching content compared with low-density and high-density polyethylene. Short-chain branching reduces crystalline thickness and lowers film stiffness; tensile modulus under ASTM D882-18 therefore falls below that of high-density film grades. The same branching distribution improves dart impact at low temperatures, but the material retains a ductile-brittle transition that shifts with film orientation and thickness. Converters evaluating freezer applications should test at the intended use temperature, often -20 °C, rather than relying on ambient impact data.
In blown-film evaluation, SABIC LLDPE 319BJ shows the solid-state property shifts of a conventional linear low-density polyethylene relative to long-chain-branched LDPE. Dart impact, puncture resistance, and Elmendorf tear at equivalent film thickness are typically higher when measured under ASTM D1709-16a, ISO 7765-2:2022, and ASTM D1922-15. The linear molecular structure produces lower melt elasticity and less shear-thinning than LDPE, which alters die swell, bubble geometry, and frost-line behavior. Compared with metallocene LLDPE based on hexene or octene, a conventional LLDPE often shows lower dart impact and machine-direction tear resistance at equal density and melt index. The process advantage is not universal: lower shear viscosity at equivalent output can reduce motor load and melt-pressure on single-screw extruders, but bubble stability may be more sensitive to cooling-air distribution. Direct numerical comparisons between resin families should not be extrapolated without controlling film gauge, die gap, blow-up ratio, frost-line height, and cooling-air temperature. Published data for this specific configuration is limited; converter trials on the target line remain the primary basis for commercial specifications.
When the grade is substituted for LDPE in a downgauging program, the processing window should be adjusted rather than inherited from the incumbent resin. Typical LLDPE blown-film extrusion uses a melt temperature of 190–230 °C, a die gap of 1.5–2.5 mm, and a blow-up ratio of 2.0:1–3.0:1 depending on bubble geometry. Longer die gaps with lower melt temperatures reduce melt fracture because linear LLDPE develops higher extensional stress at the die exit than branched LDPE. Production-scale blown-film lines using a 60 mm grooved-feed extruder with a 25–30 L/D barrier screw generally require a melt-pressure profile below the maximum rating of the screen changer; screen packs of 80/120/80 mesh or equivalent are used to trap contaminants without excessive shear heating. A common failure mode in LLDPE downgauging is bubble instability when the frost-line height is set too low or internal bubble cooling is insufficient. The corrective action is to raise the frost line slightly and increase blow-up ratio, not to increase processing temperature.
On a 45 mm grooved-feed blown-film line running SABIC LLDPE 319BJ at an output of 120 kg/h, melt-pressure variability at the die entry should remain within ±3 % of the setpoint to avoid gauge bands in the collapsing frame. Film thickness profile is measured with a traversing beta gauge across the layflat width; deviations beyond ±5 % of the nominal 40 µm target require adjustment of the die-lip gap or the air ring. The resin should not be processed at melt temperatures above 240 °C for extended residence times, particularly during color-change purges, because oxidative gel formation in the screw root and adapter can release black specks into the film. Purging with a high-viscosity LDPE or a dedicated purge compound is recommended when transitioning from colored or highly filled resins.
Low-density polyethylene puncture resistance is a thickness-dependent property influenced by film density, comonomer distribution, and orientation. In ASTM D1709-16a, a dart with a 38 mm diameter hemispherical head is dropped from a variable height onto a clamped film specimen; the failure mass reported in grams is a statistical expression of film energy absorption. ISO 7765-2:2022 uses a similar falling-dart geometry but may differ in specimen size and conditioning details; cross-standard comparisons require preconditioning at 23 °C and 50 % relative humidity according to ASTM D618-21. For SABIC LLDPE 319BJ, the impact failure mode is typically ductile deformation rather than brittle fracture at thicknesses above 25 µm, meaning the film stretches into an elongated cone before puncture. The machine-direction and transverse-direction orientation induced by the bubble can shift the tear resistance; ASTM D1922-15 Elmendorf tear specimens cut parallel to the machine direction often show lower values than transverse-direction specimens if the film has not been annealed. In coextruded structures, the 319BJ layer is frequently used as a core or skin to contribute seal integrity and puncture resistance while a metallocene LLDPE skin or LDPE seal layer modifies heat-seal initiation.
Tensile performance of SABIC LLDPE 319BJ film is evaluated under ASTM D882-18 with a grip separation speed of 500 mm/min. Film test values are anisotropic; machine-direction and transverse-direction specimens should be reported separately because the blow-up ratio and stalk height alter molecular orientation. A higher blow-up ratio increases transverse-direction orientation and can reduce the difference between machine-direction and transverse-direction tensile strength. The same orientation affects shrinkage in secondary heating processes, which should be characterized if the film enters a drying tunnel or a heat-sealing operation above 80 °C.
Heat-seal initiation of SABIC LLDPE 319BJ blown film is determined on the converter’s sealing equipment rather than from the melt-flow data alone. Seal strength can be evaluated under ASTM F88/F88M-21 with flat-bar sealing conditions such as 0.3 MPa pressure and 1.0 s dwell; the exact initiation temperature is influenced by thickness, density, contact time, and the presence of slip additives. Blending the resin with LDPE may reduce seal initiation temperature and improve optical clarity, but each 10 wt% LDPE addition can lower dart impact and stiffness. In lamination structures, corona treatment alone does not create durable chemical bonding to aluminum foil or oriented polyester. If a peel strength above 4 N/15 mm is specified according to ASTM F904, a maleic anhydride-grafted tie resin is required between the foil and the LLDPE layer.
| Scope | Standard or method | Measured response | Converter acceptance criterion |
|---|---|---|---|
| Melt flow rate | ASTM D1238 / ISO 1133-1:2022 | 1.0 g/10 min at 190 °C/2.16 kg | Lot-to-lot variation within ±0.2 g/10 min from supplier control chart |
| Density | ASTM D1505 / ISO 1183-1 | 0.919 g/cm³ | ±0.002 g/cm³ |
| Film haze | ASTM D1003-21 | Additive-dependent | ≤ 10 % for clear packaging unless slip/antiblock loading changes |
| Wetting tension | ASTM D2578-23 | Corona-treated film | 38–42 mN/m after offline treatment |
| Food-contact suitability | FDA 21 CFR 177.1520 | Supplier certification | Conformity at intended use temperature and food type |
| EU chemical regulation | REACH Article 33 | Supplier declaration | SVHC review at supply date |
| Hazardous substance restriction | RoHS Directive 2011/65/EU | Supplier declaration | Final article responsibility at converter |
SABIC LLDPE 319BJ can be dry-blended with LDPE, high-pressure polyethylene recycle, or a metallocene LLDPE at the hopper, provided the blend ratio is controlled by a gravimetric dosing system. A gravimetric blender with ±0.5 % dosing accuracy is recommended when the addition of another resin exceeds 5 wt%. Inconsistent dosing can produce visible haze bands and variable seal initiation across the film roll. If regrind from edge trim is reintroduced, the regrind content should not exceed 20 wt% unless the converter has qualified higher levels, because repeated extrusion raises the gel rating and may reduce dart impact under ASTM D1709-16a. The gel rating can be quantified by counting visible gels per square meter using a camera-based inspection system or a light table.
Processors should not infer injection-molding or rotational-molding suitability from this blown-film profile. The 1.0 g/10 min melt flow rate and high melt viscosity at low shear make thin-wall injection-filling impractical; melt temperatures and injection pressures required to fill thin-wall tools would exceed the supplier’s recommended window. In direct-contact printing with aromatic-solvent inks or adhesives, the 319BJ layer should be protected by a primer or barrier layer because solvent swelling can reduce interlayer bond strength. The product is not formulated for medical-implant applications, and converter qualification must include migration testing under the relevant food-contact regulations when the converted film is intended for fatty-food packaging. If the film is stored in high-humidity conditions above 60 % relative humidity after corona treatment, surface wettability can decay within 48 h; inline or offline retreatment may be required before lamination.
