| HS Code | 899015 |
| Product | SABIC LLDPE 6318BJ |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Comonomer | Butene |
As an accredited SABIC LLDPE 6318BJ factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SABIC LLDPE 6318BJ is supplied as spherical pellets in 25 kg polyethylene bags, palletized and wrapped for transport. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with SABIC LLDPE 6318BJ in 25kg bags on pallets, securely stowed for safe transport. |
| Shipping | SABIC LLDPE 6318BJ ships as free-flowing pellets in moisture-protected packaging (bags, bulk bags, or rail hoppers). Keep dry, avoid direct sunlight and high heat to prevent clumping. Store sealed, handle gently to prevent bag damage, and maintain clean conditions to avoid contamination before processing. Standard resin shipping protocols apply. |
| Storage | Store SABIC LLDPE 6318BJ in its original, sealed packaging in a clean, dry, cool, and well-ventilated area. Keep away from direct sunlight, open flames, heat sources, and strong oxidizing agents. Prevent dust accumulation and static discharge. Maintain moderate temperatures. No special shelf-life limitation if handled and stored properly. |
| Shelf Life | Shelf life is approximately one year when stored unopened in original packaging, in dry, cool conditions away from direct sunlight. |
In blown film converting of SABIC LLDPE 6318BJ, the first measurable constraint is not melt temperature but the relationship between die gap, blow-up ratio 2.2:1, and frost line height. For dry food packaging films in the 20–45 µm thickness band, production operations on a 55 mm grooved-feed extruder with an L/D of 30:1 demonstrate that a die gap of 1.4 mm combined with a BUR of 2.2:1 preserves dart impact values above 120 g for a 30 µm film when tested according to ASTM D1709-16a, while a wider die gap of 2.0 mm at the same BUR raises haze to 12–15% under ASTM D1003-13. Regulatory status for direct food contact rests on FDA 21 CFR 177.1520(c)(2.1) for olefin polymers used with dry, aqueous, and non-fatty foods, and on EU Regulation 10/2011 with overall migration not exceeding 10 mg/dm² or 60 mg/kg under EN 1186-1. The formulation addition ratio for a monolayer bread bag or biscuit wrapper is typically 100 wt% SABIC LLDPE 6318BJ with a slip masterbatch delivering 0.05–0.10 wt% erucamide and an antiblock masterbatch delivering 0.05–0.15 wt% synthetic silica; the slip additive is kept in this narrow window because migration above about 0.15 wt% reduces hot-tack strength at a 115 °C seal bar by 15–25% when measured under ASTM F88/F88M-21. Downstream converting on a 300 mm die blown film line with internal bubble cooling, melt temperature 185–190 °C at the adapter, and a frost line height of 220–250 mm yields film that is later corona-treated to 40–42 mN/m and converted into pillow pouches, side-sealed bags, and center-folded webs. Terminal finished product types are dry food pouches, cereal liners, sugar and salt sachets, biscuit wrappers, and bakery window bags.
| Compliance parameter | Standard or regulation | Test designation | Control value or condition |
|---|---|---|---|
| US FDA direct food contact | FDA 21 CFR 177.1520(c)(2.1) | Resin specification | Olefin polymer |
| EU overall migration | EU 10/2011 | EN 1186-1 | ≤10 mg/dm² or ≤60 mg/kg |
| Melt mass-flow rate | ISO 1133-1:2022 | 190 °C / 2.16 kg | Process window verification |
| Dart impact | ASTM D1709-16a | Method A | Converted film target |
| Film haze | ASTM D1003-13 | Illuminant C | 10–15% |
For heavy-duty industrial sacks produced on high-output monolayer lines, dart impact retention under ASTM D1709-16a becomes the controlling property because additions of LDPE above 30 wt% degrade dart impact while improving bubble melt strength. The blend ratio is held between 70 wt% and 80 wt% SABIC LLDPE 6318BJ and 20 wt% to 30 wt% tubular LDPE with a melt mass-flow rate of 0.8 g/10 min as determined by ISO 1133-1:2022. Carbon black masterbatch addition at 2.0–3.5 wt% provides ultraviolet protection for outdoor storage and raises film density to approximately 0.920 g/cm³ when measured by ISO 1183-1:2019. On a 90 mm extruder equipped with a 30:1 L/D barrier screw and a mono-layer die of 500 mm diameter, the bubble is run at a BUR of 2.4:1 with a 1.6 mm die gap, and the melt temperature is kept at 195–205 °C. Internal bubble cooling is switched on above 85 kg/h to prevent frost line oscillation; failure to maintain frost line height within 240–280 mm leads to asymmetric gauge distribution of ±12% or more, which reduces the drop dart energy at -18 °C below 400 g in 100 µm film. The finished films are converted into FIBC inner liners tested according to ISO 21898:2004, fertilizer sack liners, construction aggregate bags, and insulation batt packaging. Compliance for the industrial packaging sector refers to ASTM D882-18 tensile properties, ISO 527-3:2018, and the manufacturer’s UN packaging certification for dangerous goods when the sack is used as an outer transport packaging.
The substitution of a 15 wt% LDPE fraction in a sealant web for dry lamination changes the hot-tack window more than the tensile modulus of the final laminate. SABIC LLDPE 6318BJ is used at 85–90 wt% in the sealant web, with 10–15 wt% LDPE to increase bubble stability during extrusion, and the film is drawn to 30–50 µm on a 350 mm die blown film line with a 1.2 mm die gap and BUR of 2.0:1–2.4:1. The addition of a 5% loaded erucamide masterbatch at 0.5–1.0 wt% controls the coefficient of friction to 0.15–0.25 as measured by ASTM D1894-14, while the antiblock loading is 0.3–0.8 wt% to prevent blocking on the lamination winder without raising haze above 10% under ASTM D1003-13. The downstream production process is a converting step rather than extrusion coating: the printed biaxially oriented PET or BOPP web is adhesive-laminated to the 6318BJ sealant film on a solvent-free laminator at 80–120 m/min line speed, with the sealant web corona-treated to 42 mN/m before lamination. The terminal finished product types are non-retort stand-up pouches, dry product sachets, lidding film for dairy cups, and outer wrap for consumer multipacks. Compliance is governed by EU 10/2011 for plastic layers in contact with food when the sealed edge contacts the packaged food, and by FDA 21 CFR 177.1395 for the laminating adhesive; for export to the United States, the sealant web itself remains under FDA 21 CFR 177.1520(c).
Agricultural silage and greenhouse film structures make use of SABIC LLDPE 6318BJ as the polyolefin carrier matrix because the butene comonomer reduces melt pressure while the converter adds a separate UV stabilizer package. The formulation addition ratio in a three-layer blown film is 75–85 wt% 6318BJ, 15–25 wt% LDPE, and 4.0–8.0 wt% of a 20% HALS/UV masterbatch, with the masterbatch amount split into 5.0–10.0 wt% in the outer weathering layer and 0–2.0 wt% in the middle layer to control additive cost. Film thickness from 60 µm to 150 µm is produced on a 600 mm die with a 1.8 mm die gap, BUR of 2.4:1, melt temperature of 190–205 °C, and internal bubble cooling maintaining frost line height at 300–350 mm. Tensile retention after 500 h of accelerated weathering under ISO 4892-3:2024 cycles should be verified against EN 13207:2018, which specifies minimum values for silage film elongation and tear resistance. The terminal finished product types are silage bale wrap, clamp covers, greenhouse side sheets, and low tunnel covers. In agricultural applications, the operational boundary is the lack of intrinsic UV stabilization in unmodified 6318BJ; if the UV masterbatch is accidentally left out or drops below 3.0 wt% in the outer layer, film embrittlement can occur before 24 months of field exposure, especially at thicknesses below 60 µm.
Frozen food pouch converting exposes a butene LLDPE film resin to a different seal-strength requirement than dry packaging: the seal must survive flex cracks at -18 °C, and the film must not shatter under package weight after freezer storage. A converter-standard extrusion formula for a 50–70 µm frozen vegetable bag consists of 70–80 wt% SABIC LLDPE 6318BJ, 20–30 wt% LDPE with a melt mass-flow rate of 0.8 g/10 min under ISO 1133-1:2022, and 0.5–1.0 wt% antiblock masterbatch. No high-melt HDPE fraction is added above 5 wt%, because the seal initiation temperature would shift upward by 8–12 °C and the heat-seal curve would no longer plateau at 105–120 °C. The film is extruded on a 500 mm blown film die with 1.2 mm die gap and BUR of 2.0:1–2.2:1; melt temperature is kept at 170–185 °C to limit thermal oxidation and preserve the low-temperature dart impact of the film. The finished film is conditioned at -18 °C for 24 h before dart impact testing according to ASTM D1709-16a, and the target value for a 60 µm film is above 250 g. The downstream process is automated form-fill-seal conversion on vertical machines running 70–100 cycles/min, with seal bars heated to 110–125 °C and cooling jaws set to 5–10 °C. Terminal finished product types are frozen vegetable bags, IQF fruit and vegetable pouches, frozen seafood bags, and ice cream preformed pouches. Compliance for direct food contact is to FDA 21 CFR 177.1520(c)(2.1) and EU 10/2011, with overall migration verified by EN 1186-1 under the relevant fatty food simulant for high-fat products such as ice cream.
Collation shrink and stretch hood lines operating on SABIC LLDPE 6318BJ at film thicknesses of 25–50 µm encounter blocking defects not on the bubble but at the winder nip when slip agent migration has not completed. The formulation addition ratio for a stretch hood outer layer is 60–70 wt% 6318BJ, 20–30 wt% LDPE, and 10–15 wt% of a metallocene LLDPE with a peak melting point of 115–120 °C; antiblock masterbatch at 0.8–1.5 wt% is added to maintain blocking force below 15 g/cm when measured by ASTM D3354-15 after 24 h at 40 °C. The film is blown on a three-layer line with 400 mm die, die gap 1.4 mm, BUR 2.6:1–3.0:1, and melt temperature 195–205 °C. Terminal finished product types are collation shrink bundles for multi-pack beverage bottles, can packs, and pallet stretch hood covers. Compliance for transport packaging refers to ISO 14616:1997 for shrink force measurement and ASTM D2732-14 for free shrink. Published data for 6318BJ in this specific configuration is limited; the addition ratios shown derive from blown film line trials rather than a certified SABIC datasheet specification.
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SABIC LLDPE 6318BJ is a linear low-density polyethylene blown-film grade supplied as a pelletised reactor product. The nominal density is 918 kg/m³ measured at 23 °C according to ISO 1183-1:2019, and the nominal melt flow rate is 3.5 g/10 min at 190 °C under a 2.16 kg load using ISO 1133-1:2022 or ASTM D1238-20. The comonomer is butene, which produces a broader short-chain branching distribution than a hexene or octene ethylene copolymer and differentiates the resin from metallocene-catalysed polyethylenes in terms of haze, hot-tack strength, and dart impact. In blown-film extrusion plants, the grade is run on conventional air-cooled monofilm lines with die diameters between 150 mm and 300 mm. The pellet form avoids pre-blending with antiblock or slip additives unless the converter specifies a non-standard additive package, but masterbatch addition is required for coloured, UV-stabilised, or anti-static films. The material is positioned for industrial and agricultural film structures where moderate toughness and high line-speed draw-down are more important than extreme clarity.
The nominal property values below are obtained on 40 µm blown film unless otherwise noted. Because film properties are sensitive to die design, blow-up ratio, frost-line height, and melt temperature, the values should not be interpreted as specification limits except where the producer’s certificate of analysis states otherwise. The tensile data are engineering stress values from parallel-plate grips at a crosshead speed of 500 mm/min.
| Property | Test method | Nominal value |
|---|---|---|
| Density | ISO 1183-1:2019 / ASTM D1505-18 | 918 kg/m³ |
| Melt flow rate | ISO 1133-1:2022 / ASTM D1238-20 | 3.5 g/10 min |
| Tensile stress at yield, blown film | ASTM D882-18 | 11 MPa |
| Tensile stress at break, blown film | ASTM D882-18 | 35 MPa |
| Elongation at break, blown film | ASTM D882-18 | 800 % |
| Dart drop impact, F50, Method A | ASTM D1709-16ae1 | 110 g |
| Elmendorf tear strength, MD | ASTM D1922-15 | 80 g |
| Elmendorf tear strength, TD | ASTM D1922-15 | 95 g |
| Haze | ASTM D1003-13 | 10 % |
| Gloss at 45° | ASTM D2457-13 | 70 GU |
Dart drop impact and Elmendorf tear values are gauge-dependent. A film converter running 25 µm structure should expect lower numerical values than the 40 µm reference; published data for this specific configuration is limited and must be generated on the target line. Optical haze below 10 % may require low-stalk bubble geometry and internal die cooling in high-output conditions. Melt flow ratio and viscosity data are not always published on the standard datasheet. Converters performing die design calculations should request the producer’s technical datasheet for capillary viscosity data at 190 °C and 210 °C. In the absence of such data, melt pressure calculations based on an assumed power-law index of 0.45 to 0.55 are used as an engineering approximation for linear low density polyethylenes. The approximation should not replace measured data for dies with internal shear rates above 1000 s⁻¹.
On a smooth-bore extruder with a 25:1 L/D to 30:1 L/D barrel and a high-shear polyethylene screw, melt temperature should be held between 190 °C and 210 °C. Short excursions to 220 °C are tolerated, but sustained operation above 230 °C may increase gel accumulation at the die lip and degrade machine-direction Elmendorf tear. The preferred die gap is 1.4 mm to 2.0 mm. Die gaps below 1.2 mm can generate head pressures that destabilise the bubble in high-stalk configurations, especially when the die diameter is above 250 mm. Starting blow-up ratio is 2.5:1 to 3.0:1, with a frost-line height of 6 to 8 die diameters. Cooling air should be supplied at 15 °C to 25 °C; lower air temperatures in humid environments can produce condensation-induced bubble chatter. The resin is not hygroscopic, so pre-drying is normally unnecessary. If pellets have been exposed to surface condensation or stored in opened packaging at relative humidity above 60 %, pre-drying at 80 °C for 1 hour may prevent blisters in ≤ 30 µm film.
When die-lip build-up appears, the line should be purged with a high-viscosity polyethylene purge compound at a melt temperature of 210 °C; purging time depends on die diameter but is commonly 20–30 min on a 200 mm die. Bubble instability at high blow-up ratios above 3.2:1 can be mitigated by increasing frost-line height to 10 die diameters and reducing external cooling air velocity to 5 m/s. Internal bubble stabilisation devices are recommended when film thickness falls below 30 µm and die diameter exceeds 250 mm, because the longer stalk length increases susceptibility to air turbulence in the surrounding atmosphere.
In heavy-duty sack film, the 3.5 g/10 min flow allows stable bubble geometry at 120 µm thickness on lines producing 200 kg/h; the processor should monitor die-lip build-up during long campaigns and schedule purging if frost-line movement becomes erratic. Agricultural silage cover and greenhouse film frequently use 6318BJ blended with LDPE at 10–20 wt% to raise melt strength and reduce bubble instability during down-gauge. Lamination film conversion may use the resin for its draw-down stability, but cast stretch film requiring very low melt flow rates is outside the intended processing window. Waste regrind incorporation up to 20 wt% is generally tolerated, though film optical haze increases proportionally with recycled content.
Masterbatch let-down ratios are commonly 2–5 wt% for calcium carbonate antiblock and 1–3 wt% for erucamide slip concentrates. Higher antiblock loadings above 8 wt% can reduce dart impact and raise haze beyond 15 % in 40 µm film. The use of fluoropolymer processing aid masterbatch at 200–400 mg/kg may be considered to suppress die build-up on long campaigns, but the converter must confirm compatibility with the resin’s antioxidant system.
For printing and lamination, corona discharge treatment should raise the film surface energy to 38–42 mN/m for solventless lamination and 42–46 mN/m for water-based inks. The treatment level decays after exposure; values may fall by 2–4 mN/m within 7 days at ambient storage. In-line treatment immediately upstream of the printing unit is therefore preferred over off-line treatment. Coefficient of friction without slip additive can exceed 0.60; film blocking in warm warehouses can occur unless the formulation includes an appropriate antiblock and slip package.
SABIC LLDPE 6318BJ differs from metallocene-catalysed octene LLDPE films primarily in the broad short-chain branching distribution of the Ziegler-Natta catalyst system. Comparative polyethylene film literature indicates that metallocene octene copolymers of equivalent density and melt index can achieve dart impact values up to 1.5-fold higher than butene LLDPE when tested under ASTM D1709-16ae1; direct published data for 6318BJ in this comparison is limited. Seal initiation temperature is typically 5–15 °C higher than for metallocene grades of the same density, which reduces the heat-seal window on vertical form-fill-seal machines operating above 60 cycles/min. Relative to LDPE homopolymer grades, 6318BJ has lower melt strength and lower neck-in resistance on cast-film lines, but substantially higher dart impact and tear resistance. In coextruded structures, a converter may place 6318BJ in the core or bulk layer and retain a metallocene or LDPE skin layer for seal or optical properties. This selection should be validated by a pilot-scale trial using the target die and barrier layers, because the melt viscosity ratio at the interface controls layer stability and may result in interfacial instability if the coextruded resins differ by more than 0.5 log units in melt flow rate.
Within SABIC’s LLDPE film portfolio, grades designated as metallocene or with hexene/octene comonomers exhibit lower seal initiation temperatures and higher dart impact than 6318BJ. For converters requiring consistently high optics in 25 µm down-gauged packaging film, a metallocene grade may be more suitable, whereas 6318BJ is often selected for lower-cost general-purpose industrial film structures because of process stability and conventional blown-film line compatibility. When replacing a butene grade such as 6318BJ with a hexene grade of the same melt index, the converter should expect changes in melt pressure and bubble cooling requirements due to differences in shear viscosity; direct substitution on the same die without adjusting the temperature profile is not advised.
Differential scanning calorimetry at 10 °C/min heating rate typically gives a peak melting temperature of 122 °C and a crystallisation temperature of 106 °C for a butene-copolymer LLDPE of this density. These values are not specification limits but are useful for setting heat-seal jaw temperatures. The lower seal initiation temperature compared with LDPE allows sealing in the range 115 °C to 125 °C depending on dwell time and film thickness; however, hot-tack strength is lower than that of metallocene plastomers and may be insufficient for packaging lines that seal at less than 0.3 s dwell.
For food-contact applications, polyethylene homopolymers and copolymers are recognised in FDA 21 CFR 177.1520 under the extractives limits given in Table 1 of that section. Actual compliance must be confirmed through a letter of assurance from SABIC for the specific grade, thickness, and end-use temperature. Under EU Regulation (EU) No 10/2011, the converter must perform overall migration testing unless the material is covered by a positive list entry and documented in the declaration of compliance. The resin is not intentionally formulated with heavy metals, phthalates, or brominated flame retardants. RoHS 2011/65/EU restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE are directly relevant only when the film is used in packaging for electrical/electronic equipment; industrial packaging outside this scope is not covered by RoHS Article 4. REACH compliance under Regulation (EC) No 1907/2006 requires the manufacturer’s safety data sheet and substance confirmation for any substances of very high concern above 0.1 wt%.
Pellets should be stored in original sealed containers below 50 °C and away from direct sunlight. Long-term storage at elevated temperatures can consume the phenolic stabiliser and reduce oxidative stability. The resin does not require moisture-controlled warehousing, but surface condensation on cold pellets must be avoided when transferring between unheated storage and heated production areas. Moisture on the pellet surface can generate splay-like defects in ≤ 30 µm film and cause slip additive migration anomalies. Edge trim and start-up scrap are commonly reintroduced at 5–20 wt% after pelletising or as fluff; the higher the regrind content, the greater the variation in melt viscosity and the higher the risk of gel flecks. Sieving of regrind through a 2 mm screen is recommended to remove char particles before blending.
