| HS Code | 998594 |
| Density | 0.918 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 2.0 g/10 min |
| High Load Melt Flow Rate 190 C 21 6 Kg | 20 g/10 min |
| Melting Point | 122 °C |
| Crystallization Temperature | 100 °C |
| Vicat Softening Point 10 N | 104 °C |
| Brittleness Temperature | < -70 °C |
| Tensile Strength At Yield | 10 MPa |
| Tensile Strength At Break | 24 MPa |
| Elongation At Break | 800 % |
| Flexural Modulus | 270 MPa |
| Shore D Hardness | 50 |
As an accredited SABIC LLDPE 318BJA factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SABIC LLDPE 318BJA is supplied as free-flowing pellets in 25 kg multi-walled paper bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | SABIC LLDPE 318BJA loaded in 20′ FCL, packed in 25kg bags on pallets, securely stowed for safe transport. |
| Shipping | SABIC LLDPE 318BJA is supplied as free-flowing pellets in sealed bags or bulk containers. It ships as non-hazardous cargo, protected from moisture and direct sunlight. Keep dry, ventilated, and away from heat sources during transport to preserve product quality. |
| Storage | Store SABIC LLDPE 318BJA in a clean, dry, cool, and well-ventilated area, away from direct sunlight, UV radiation, heat sources, and moisture. Keep containers sealed and undamaged. Avoid contact with strong oxidizers. No special hazardous storage conditions are required. Use a first-in, first-out inventory system to maintain product quality. |
| Shelf Life | Store in a cool, dry place away from direct sunlight. Shelf life is typically 12 months from date of delivery. |
Heavy-duty industrial liner extrusion places SABIC LLDPE 318BJA as the primary film-forming polyolefin at a gravimetric dosing station configured for single-component and multi-component recipes. The applicable compliance boundary for non-food bulk packaging is set by REACH under EC 1907/2006, the European Packaging and Packaging Waste Directive 94/62/EC Article 11, which restricts total concentration of lead, cadmium, mercury and hexavalent chromium to 100 mg/kg summed across packaging components, and the United States TPCH model legislation with the same 100 ppm ceiling. RoHS 2011/65/EU applies only where packaging is integral to an electrical/electronic product. In formulation, 318BJA is loaded at 70–100 wt% of extruder feed. Post-industrial LLDPE from closed-loop internal trim is introduced at 10–25 wt% when final article specifications permit; a high-pressure LDPE of 0.923 g/cm³ density and melt flow rate 0.7–0.9 g/10 min is added at 10–20 wt% to raise bubble stability. Carbon black masterbatch is metered at 2.5–4.0 wt% with a pellet pre-mixer to maintain ±0.5 wt% dosing accuracy. Downstream conversion uses a grooved-feed single-screw extruder, L/D 25:1–30:1, barrier screw with Maddock mixer, die diameter 200–400 mm, die gap 1.8–2.5 mm, and dual-lip air ring. Melt temperature is controlled at 190–230 °C, head pressure 250–450 bar, blow-up ratio 2.5:1–3.5:1, and frost line height maintained at 6–8 die diameters to balance dart impact and tear propagation. At 25 µm finished thickness, a dart impact value above 60 g per ASTM D1709 is typically required; gauge variation is monitored by profilometry with a ±5% tolerance band. Terminal article types include waste collection liners, temporary construction debris sacks, granular resin packaging liners, pallet top covers, and extruded tubular liners for non-hazardous minerals. For chemical liner applications, converter verification against non-polar solvent swelling is required because LLDPE absorbs aliphatic and aromatic hydrocarbons under prolonged contact.
Where 318BJA is used in direct food-contact webs, the controlling compliance path is dual-track: in the United States, the polymer falls under 21 CFR 177.1520(c) for olefin polymers with density 0.85–1.0 g/cm³ and olefin content above 50 wt%, with use conditions governed by 21 CFR 176.170(c) when combined with cellulosics or adhesives; in the European Union, Regulation (EU) No 10/2011 and its amendments require overall migration below 10 mg/dm² measured according to EN 1186-1 using food simulants selected under Annex III of the regulation. If the film carries a slip/antiblock masterbatch, the additive package must be authorized under 10/2011 Annex I with specific migration limits; reclaimed post-consumer material is excluded from direct food contact unless a functional barrier is demonstrated. For formulation, 318BJA is metered at 100 wt% for monolayer applications or blended with an LDPE grade of 5–25 wt% in coextruded structures to lower seal initiation temperature. Slip/antiblock masterbatch is introduced at 2–4 wt%, with erucamide-type slip levels monitored because migration to the cold-seal side can alter seal strength. The downstream blown-film process uses a smooth-bore or low-shear screw, L/D 24:1–30:1, with die gap 1.2–2.0 mm, melt temperature 200–240 °C, blow-up ratio 2.0:1–3.0:1, and a chilled air ring operating at 8–15 °C. Melt temperature must be held within ±5 °C of the nominal set point because excursions above 240 °C accelerate erucamide volatilization and yellowing, while operation below 200 °C raises back pressure and die-lip deposit formation. The film is not pre-dried unless storage relative humidity exceeds 60%; surface moisture can cause micro-gels and die-lip build-up. Terminal article types include bakery twist-tie bags, frozen food liner bags, fresh produce bags, cereal pouch liners, and institutional sandwich wrap; retort and high-temperature fat processing require separate migration testing because polymer swelling in fatty simulant can increase total extractables.
| Jurisdiction / Instrument | Test method | Limit / condition | Production consequence |
|---|---|---|---|
| FDA 21 CFR 177.1520(c) | Olefin polymer extraction cell; density 0.85–1.0 g/cm³ | Food-contact use conditions A–H per 21 CFR 176.170(c) | Permits direct monolayer food contact |
| Regulation (EU) No 10/2011 | EN 1186-1 migration cell | Overall migration 10 mg/dm² | Defines simulant selection and worst-case laminate testing |
| REACH EC 1907/2006 | SVHC screening per Article 33 | Candidate list substance 0.1% w/w per article | Supply chain confirmation required for masterbatches |
| RoHS 2011/65/EU | XRF screening / IEC 62321-3-1 | Lead 1000 mg/kg, cadmium 100 mg/kg, mercury 1000 mg/kg, Cr VI 1000 mg/kg where applicable | Only if packaging is integral to electrical/electronic equipment |
In three-layer agricultural film extrusion, 318BJA is selected for the core layer or as the primary load-bearing ply because its melt stability tolerates long continuous runs with recycled edge trim. The regulatory framework is primarily European harmonized standard EN 13206 for covering films, which classifies transparency, total light transmission, UV ageing, and mechanical retention in greenhouse film; REACH compliance under EC 1907/2006 remains mandatory for UV stabilizer masterbatches, and unintentional persistent organic pollutants are controlled under EU 2019/1021. No food-contact positive list applies unless the same line also runs crop packaging. In formulation, 318BJA is loaded at 70–85 wt%, with LDPE at 15–25 wt% to increase bubble stability and improve dart impact retention after ageing. A UV stabilizer masterbatch containing HALS chemistry is added at 1.5–3.0 wt%, and an IR absorber or EVA-based infrared block concentrate at 1.0–2.0 wt% where greenhouse heat retention is specified. Total additive masterbatch should not exceed 4.0 wt% to avoid surface bloom and dust build-up in screening packs. The downstream process is a blown-film coextrusion line with three extruders configured for layer distribution 35/30/35 or 40/20/40, total die diameter 300–450 mm, die gap 1.8–2.4 mm, blow-up ratio 2.2:1–3.0:1, and melt temperature 190–220 °C in the skin layers. Cooling-air temperature is kept at 8–18 °C, and the frost line is lowered to 5–7 die diameters to reduce orientation-induced splitting in the transverse direction. Terminal article types include greenhouse covers, low tunnel films, silage clamp covers, silage stretch overlays, and black/white mulching films, though the latter may require a higher-melt-strength HDPE skin layer.
Sealant-layer design with 318BJA requires differentiating low-density autoclave LDPE seal initiation behavior from the higher dart impact plateau of LLDPE. The regulatory path for food-contact laminates combines FDA 21 CFR 177.1520 for the polyolefin sealant web and EU 10/2011 for European end-use, with adhesive and ink components governed separately by 21 CFR 175.105 where applicable. Overall migration from the finished laminate must remain below 10 mg/dm² per EN 1186-1; if the sealant layer is not an effective barrier, migration from the adhesive layer is included in the worst-case calculation. In formulation, 318BJA is blended with 10–20 wt% LDPE to reduce seal initiation temperature by 5–8 °C on production sealers; the sealant layer thickness is maintained at 15–30 µm within a total laminate of 60–90 µm. Slip/antiblock masterbatch is loaded at 2–5 wt%, with dosage adjusted so that slip migration does not reduce seal strength below 2.5 N/15 mm when tested per ASTM F88. The downstream process may be cast film coextrusion or blown film coextrusion. For cast lines, melt temperature is 220–250 °C, air gap 10–20 cm, and chill roll temperature 18–28 °C; for blown lines, die gap is 1.5–2.0 mm and blow-up ratio 2.0:1–2.5:1. Melt temperature must be held within ±5 °C of the nominal 235 °C set point during cast film lamination because excursions above 250 °C accelerate additive degradation, while operation below 220 °C may produce surface melt fracture and inconsistent gauge. Corona treatment is set to 38–42 dyn/cm per ASTM D2578; treatment above 44 dyn/cm may oxidize the surface and reduce seal initiation consistency. Terminal article types include stand-up pouches, three-side-seal sachets, lidding webs for dry snacks, and laminated industrial sacks with moisture-barrier aluminum or metallized OPET layers.
Cast film conversion of 318BJA in pallet-unitization stretch film exposes the resin to a rapid quench regime that controls crystallinity, haze and cling-layer migration. Compliance for non-food industrial stretch film is primarily REACH under EC 1907/2006; where the film is exported to North America, TPCH heavy metal limits of 100 ppm and RoHS 2011/65/EU for electrical pallet wraps apply. A tackifier component must not generate aromatic migrations beyond the thresholds defined in supplier certification. In formulation, 318BJA is used at 50–80 wt% in the core or cling side of a multilayer cast film; a metallocene LLDPE with higher melt rheology is added at 15–30 wt% to raise elongation and puncture energy, while LDPE is added at 5–15 wt% to stabilize the cast extrusion web. Polyisobutylene or similar tackifier masterbatch is metered at 2–6 wt% depending on cling target. The cast film line is configured with a 120–180 cm slot die, die gap 0.5–0.8 mm, melt temperature 220–260 °C, air gap 15–30 cm, and a quench roll temperature of 18–25 °C; web speed is balanced against trim reclaim to keep gauge variation within ±3% on line scanners. Higher melt temperature above 260 °C may degrade tackifier and form die-lip deposits. Terminal article types include hand pallet wrap, machine pallet wrap, pre-stretch rolls, and bundling film for beverage multipacks.
E-commerce mailer and retail carrier bag extrusion uses 318BJA as a cost-effective blown-film backbone where puncture resistance and weld-line strength are dominant. The applicable packaging waste directive 94/62/EC Article 11 and the U.S. TPCH model legislation both fix total heavy metals at 100 mg/kg; if the film is intended for mono-material reusable mailers, recyclability assessment under EN 13430 may require statements on polymeric composition. In formulation, 318BJA is loaded at 60–90 wt%, with post-industrial interior regrind at 10–25 wt% sourced from closed-loop bag production; color masterbatch is added at 2–5 wt%, and a processing aid masterbatch at 0.5–1.0 wt% may be introduced when elevated haze or melt fracture appears at low temperatures. The converter runs a single-screw blown-film extruder with L/D 24:1–30:1, die diameter 150–250 mm, die gap 1.6–2.2 mm, blow-up ratio 2.0:1–3.0:1, melt temperature 190–225 °C, and take-off speed adjusted to maintain thickness between 40–80 µm. Corona treatment is held at 38 dyn/cm for flexographic or digital print adhesion; film is not pre-dried unless residual moisture from reclaimed natural resin exceeds 500 ppm as measured by Karl Fischer on pellets. Terminal article types include courier mailer bags, retail carry-out bags, drawstring liners for e-commerce boxes, and garment polybags. Published data for very high recycled-regrind configurations above 25 wt% in ultra-low gauge below 25 µm is limited; pilot line trials are required before commercial commitments.
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SABIC LLDPE 318BJA is a butene-based linear low density polyethylene pellet supplied for general-purpose film extrusion. The manufacturer’s published nominal values place density at 918 kg/m³ when measured by ISO 1183-1 and melt flow rate at 2.8 g/10 min at 190 °C under 2.16 kg load when tested by ISO 1133-1. The grade is supplied with an antioxidant and process stabilizer package; the suffix may indicate a surface-additive package including slip and antiblock, and the exact formulation is defined in the manufacturer’s technical datasheet. The material is registered as CAS 9002-88-4 and falls within the olefin polymer classification under FDA 21 CFR 177.1520. Food-contact status in the European Union is assessed under EU Regulation (EU) No 10/2011, with migration testing required on the finished article.
In blown film extrusion on a single-screw extruder with a 45 mm screw diameter and an L/D ratio of 30:1, the 2.8 g/10 min melt flow rate of 318BJA produces lower melt viscosity at constant melt temperature than a 1.0 g/10 min LLDPE. The resulting die-entry pressure is lower for the same screw speed and die gap, which may permit increased specific throughput or reduced motor load. Bubble stability is lower because the melt has less elongational viscosity at the die exit; this may require a reduction in blow-up ratio, a higher frost line height, or a narrower die gap to maintain bubble geometry. On equipment with a 1.8 mm die gap and dual-lip air ring, a starting melt temperature of 190 °C to 220 °C is used in commercial LLDPE processing bulletins. Published data for this specific SABIC grade on a defined production line is limited; line trials are required to establish the exact pressure/throughput relationship.
When 318BJA is evaluated for downgauging a 100 µm heavy-duty sack film to 80 µm, the comparative ranking should be based on film properties measured after conditioning at 23 °C ± 2 °C and 50 % ± 5 % relative humidity. The relevant methods are ASTM D1709 Method A for dart impact, ASTM D1922 for Elmendorf tear, and ASTM D882 for tensile strength at break. The manufacturer’s product datasheet provides typical values for a reference film gauge; these values cannot be transferred directly to a production blown film line because blow-up ratio, frost line height, and die gap alter orientation balance. In downgauging, the higher melt flow rate of 318BJA can improve drawdown on air-cooled lines, but the final film must be tested for impact and tear retention before replacing a grade with a lower melt flow rate.
The 918 kg/m³ density places 318BJA in the low-crystallinity segment of linear polyethylene, where butene comonomer disrupts chain packing along the backbone. The melt flow rate of 2.8 g/10 min corresponds to lower number-average molecular weight than LLDPE grades with 1.0 g/10 min at the same density. In high-shear operations, such as a 75 mm extruder with a barrier screw and a screw speed above 100 min⁻¹, the lower melt viscosity reduces viscous shear heating and permits higher specific output before melt-temperature limits are reached. However, shear rate at the die lip can remain high because narrow die gaps are used to obtain film gauge; melt fracture may occur if the die exit wall shear stress exceeds the plateau for linear polyethylene. The use of a lower melt temperature, rather than a higher melt temperature, is favored for maintaining die lip cleanliness because additive decomposition and gel formation escalate above 230 °C.
Cast film processing uses a flat die with a die gap of 0.4 mm to 0.8 mm and a chill roll temperature between 20 °C and 30 °C. The 2.8 g/10 min melt flow rate of 318BJA supports low melt temperature operation and uniform die spread in a coathanger manifold. In cast film, the absence of a bubble removes the melt strength limitation that dominates blown film; the main processing risks are edge neck-in, draw resonance at high line speeds, and surface replication from the chill roll. The line speed at which draw resonance occurs is a function of melt temperature, die gap, and polymer molecular weight distribution; for 318BJA, published data for this specific configuration is limited, so a step ramp on line speed is recommended to map the resonance boundary. Tensile orientation in cast film is primarily machine-direction, so specifications for ASTM D882 tensile properties will differ from blown film of the same gauge.
Nominal resin specifications for three SABIC LLDPE film grades with the same base density illustrate the position of 318BJA in the melt flow series.
| Grade | Nominal density (kg/m³) | MFR at 190 °C/2.16 kg (g/10 min) | Test standard |
|---|---|---|---|
| SABIC LLDPE 118WJ | 918 | 1.0 | ISO 1133-1 |
| SABIC LLDPE 218BJ | 918 | 2.0 | ISO 1133-1 |
| SABIC LLDPE 318BJA | 918 | 2.8 | ISO 1133-1 |
The three grades share a nominal density of 918 kg/m³ and are butene-based; the different melt flow rates reflect different molecular weight distributions. The 2.8 g/10 min value of 318BJA places it at the higher-flow end for blown film, where converter productivity is favored but melt strength is reduced. This distinction is not a grade defect but an operational boundary: on dies larger than 300 mm, lower melt strength may result in bubble flutter unless air ring settings are modified.
The “A” suffix in 318BJA is associated in SABIC documentation with an additive package formulated for surface performance. In thin film, antiblock raises surface roughness to prevent blocking during roll winding; slip agents migrate to the surface over time and reduce coefficient of friction. The static and kinetic coefficients of friction are measured according to ASTM D1894 after conditioning at 23 °C and 50 % relative humidity. Because slip migration is time- and temperature-dependent, friction values measured at 24 h after extrusion differ from those measured at 7 days. Blocking force is evaluated by ASTM D3354. Processors should not infer constant surface performance from pellet additive content alone; film gauge, film winding tension, and storage temperature influence migration kinetics.
For butene LLDPE with a density of 918 kg/m³, differential scanning calorimetry per ISO 11357-3 typically shows a melting endotherm near 120 °C to 124 °C. Thermal degradation onset in a nitrogen atmosphere is above 300 °C, but extended exposure to melt temperatures above 250 °C can generate gel particles and yellowing. The hopper and feed throat should remain cool to prevent pellet bridging. If surface condensation occurs during storage or transfer, the pellets may introduce water into the feed; a hopper drying step at 60 °C to 80 °C for 2 h to 4 h is applied in practice for LLDPE pellets with surface moisture. The exact drying requirements for 318BJA in high-humidity production areas should be confirmed from SABIC technical service documentation.
Reclaim and coextrusion compatibility also impose boundaries. 318BJA reclaim can be re-introduced into a monolayer film line if the regrind is free of polyethylene terephthalate, polyamide, and paper fibre contamination. In coextruded structures, the grade may be used in the skin layer or core layer, but the higher melt flow rate relative to structural LLDPE grades may result in layer thickness non-uniformity if the die manifold has uneven residence-time distribution. The use of processed regrind at levels above 10 % to 20 % of the total throughput requires gel-count monitoring and melt filtration with a screen pack no coarser than 100 µm.
The base LLDPE is covered by FDA 21 CFR 177.1520 for olefin polymers when the final article meets end-use specifications. For the European Union, compliance with EU Regulation (EU) No 10/2011 requires migration testing of the finished article because the additive package and processing history affect overall migration and specific migration of additives. A converter cannot rely solely on resin certification; the final film must be assessed under the intended food simulants and conditions of use. SABIC publishes a product stewardship summary and a regulatory information document for its LLDPE grades. If the film is used in sensitive packaging such as fatty food contact, the specific migration limits for slip additives and processing aids must be verified using EN 1186 general migration methods and specific migration methods as applicable.
| Standard or regulation | Scope | Application to 318BJA |
|---|---|---|
| ISO 1133-1 | Melt flow rate | Specification value 2.8 g/10 min |
| ISO 1183-1 | Density | Specification value 918 kg/m³ |
| FDA 21 CFR 177.1520 | Olefin polymers | Base polymer compliance |
| EU 10/2011 | Plastic food contact | Finished article migration required |
In comparison with metallocene-catalyzed LLDPE grades of similar density, 318BJA has a broader molecular weight distribution and a different comonomer distribution. This leads to a different balance of dart impact, tear, and tensile properties in film; the comparison should be made using ISO 7765-1 and ASTM D1709 on films of the same gauge and orientation. The grade is selected for general-purpose film applications where melt flow, drawdown, and surface slip are primary process requirements.
Coextrusion of 318BJA with high-density polyethylene layers requires selection of layer ratios and melt temperatures to prevent interfacial instability. In a three-layer line with a 200 mm die and a 1.4 mm die gap, the 318BJA skin layer may be run at 190 °C to 210 °C, while the HDPE core is run at 200 °C to 230 °C depending on the HDPE grade. The difference in melt viscosity between the 918 kg/m³ LLDPE and an HDPE with an MFR of 0.5 g/10 min can cause layer encapsulation if the die lip land length is too short. Interfacial layer stability is assessed by measuring layer thickness variation using optical microscopy of cross-sections; a variation below ±10 % of the target layer thickness is typically required for packaging film. Published data for 318BJA in this coextruded configuration is limited; processing trials with a variable-geometry inner lip are necessary to optimize layer uniformity.
During start-up and material transitions, 318BJA should be purged through the extruder until the previous polymer is no longer visible in the film. A transition from a high-viscosity LLDPE to 318BJA may create a viscosity mismatch that leaves deposits on the screw and die if the screw speed is increased too quickly. The use of a purging compound with a high-viscosity carrier is not required for this grade, but the die lips should be inspected after the first 30 min of operation. The screw speed should be increased in steps of 10 min⁻¹ to 20 min⁻¹ until the target output is reached, while monitoring melt temperature and die pressure.
