SABIC SUPEER mLLDPE 8118 is an octene-1 metallocene linear low density polyethylene characterized by a nominal density of 0.918 g/cm³ per ISO 1183-1 and a melt flow rate of 1.0 g/10 min per ISO 1133-1:2022 at 190 °C and 2.16 kg load. The application environments that follow are restricted to conversion routes where the viscosity envelope and narrow comonomer distribution of this grade are routinely specified in blown film coextrusion. In each application, the polymer is treated as a formulation component rather than an isolated raw material, because the final processing window, regulatory status, and mechanical performance depend on the surrounding layer structure and additive package.

How Does Sealant-Layer Rheology Affect Frozen-Food VFFS Line Speeds?

In frozen-food vertical form-fill-seal (VFFS) packaging, the sealant layer of a coextruded blown film is evaluated through hot-tack and seal initiation performance rather than ambient tensile yield. The sealant layer is generally formulated with SABIC SUPEER mLLDPE 8118 at 60–80 wt% of the layer blend, while a fractional-MFI LDPE component at 20–40 wt% is introduced to raise bubble stability and reduce neck-in on dies in the 1.8–2.4 mm die-gap range. Compliance for EU retail packaging relies on Commission Regulation (EU) No 10/2011, with an overall migration limit of 10 mg/dm², and on U.S. direct-contact clearance under FDA 21 CFR 177.1520 for olefin polymers. Converters producing frozen-food formats under typical supermarket audits also require that the film substrate comply with current GMP requirements under Regulation (EC) No 2023/2006.

Downstream conversion occurs on multi-layer blown film lines fitted with internal bubble cooling and segmented air rings; melt temperatures are held at 180–210 °C, blow-up ratios are set between 2.0:1 and 3.0:1, and frost-line heights are commonly positioned at 6–10 die diameters. Die gap selection interacts with the shear-thinning behavior of the metallocene: narrower gaps below 1.8 mm can generate excessive melt pressure and surface melt fracture, while gaps above 2.4 mm can reduce the transverse direction orientation needed for freezer bag toughness. The low seal initiation temperature of the resin permits VFFS jaw settings between 115 °C and 145 °C at dwell times below 0.3 s, which is critical for high-speed pillow-bag lines running 80–120 bags/min. Seal strength is verified per ASTM F88, while impact and tear resistance are controlled by ASTM D1709-16a and ASTM D1922-15a respectively. End-product configurations include pillow pouches for individually quick-frozen vegetables, gusseted freezer bags, and HFFS pre-made side-seal bags; film is typically supplied in thicknesses from 25 µm to 80 µm.

Within the heavy-duty industrial packaging sector, the octene-1 architecture of SABIC SUPEER mLLDPE 8118 is specified in the core layer of three-layer shipping-sack and FIBC inner-liner films, where the primary failure modes are puncture propagation and cold-drop impact. The addition ratio in the core layer is typically 20–35 wt% mLLDPE 8118, with the outer layers consisting of HDPE or broad-MWD LLDPE at 65–80 wt% to preserve creep resistance and stiffness. Coextrusion is performed on high-stalk blown film lines with die gaps of 2.5–3.2 mm, a blow-up ratio between 1.8:1 and 2.2:1, and melt temperatures not exceeding 220 °C to avoid gel formation. For FIBC inner liners, relevant standards include ISO 21898:2007 for flexible intermediate bulk containers, with specific stack-load and cyclic-load verification methods; for export sacks carrying hazardous materials, the outer woven polypropylene shell is evaluated under the UN Model Regulations Chapter 6.5 requirements, while the inner liner is specified as a contaminant barrier with a minimum film thickness of 40 µm. End-product formats include FIBC liners, gusseted valve sacks for polymer granules, and agricultural seed packaging.

Tear propagation is assessed by ASTM D1922-15a in both machine and transverse directions; the mLLDPE component increases the low-temperature cornering resistance of the sack, which is verified by drop tests according to ISO 7965-2 for filled sacks. The processing limitation of this structure is the reduction in creep stiffness when the mLLDPE fraction exceeds 35 wt%, which can increase sack elongation under stacking; published data for this specific configuration is limited, so the upper blend boundary is generally determined by stack-load trials on the converter’s own line. Film thicknesses for these liners are commonly between 50 µm and 120 µm.

Agricultural Silage Cover Film Impact Resistance Under Low-Temperature Tension

Agricultural silage cover and greenhouse end-uses expose the film to long-duration tensile loading at low ambient temperatures, so the selection criteria center on slow-crack growth and dart impact retention after UV exposure. SABIC SUPEER mLLDPE 8118 is commonly blended into the surface layer at 30–50 wt% with a thermoplastic C4-LLDPE or LDPE carrier phase at 50–70 wt%, and a UV stabilizer masterbatch based on HALS plus carbon black or titanium dioxide is metered at 1.5–3.0 wt%. Compliance for silage films in the EU is verified against EN 13206:2017 for covering films, which specifies tensile elongation and durability requirements, while greenhouse films are evaluated under EN 13206 or dairy-specific agricultural standards and under the general requirements of REACH Regulation (EC) No 1907/2006 for monomer and additive content.

Blown film extrusion for silage cover is carried out on three-layer lines with die gaps of 2.0–3.0 mm, blow-up ratios of 2.5:1 to 3.5:1, and bubble stabilizing internal cooling to maintain layer thickness tolerances of ±5%. Film thicknesses typically range from 100 µm to 200 µm; the mLLDPE component improves Elmendorf tear resistance in both directions, which is assessed by ASTM D1922-15a, and improves low-temperature drop impact tested by ASTM D1709-16a. End-product types include clamp-on silage cover sheets, bunker pit edge strips, and single-season greenhouse cladding; the operational boundary is that the resin does not provide sufficient UV stability on its own and must be compounded with a hindered amine stabilizer system before exposure beyond 12 months.

On high-speed stand-up pouch lamination lines, the sealant web is required to deliver low-temperature seal initiation without sacrificing interlayer adhesion after solventless lamination. SABIC SUPEER mLLDPE 8118 is introduced into the sealant layer at 75–90 wt% of the layer formulation, with the balance comprising either a low-crystallinity LDPE for lower sealing pressure or an antiblock/slip masterbatch at 1–2 wt% for coefficient-of-friction control. Indirect food contact and direct food contact status are documented under FDA 21 CFR 177.1520 and Commission Regulation (EU) No 10/2011, while lamination adhesives are evaluated separately under their own positive lists. Downstream conversion begins with blown film coextrusion at a die gap of 1.5–2.2 mm and a blow-up ratio of 2.0:1 to 2.5:1, followed by solventless or solvent-based lamination to PET, BOPP, or aluminium foil; the resulting laminate is converted on form-fill-seal machines with seal-bar temperatures between 125 °C and 155 °C and seal times of 0.2–0.4 s. End-product formats include stand-up pouches for dry snacks, pet food, and powdered beverages, with final laminate thickness between 70 µm and 140 µm.

The boundary condition in this conversion route is adhesion to foil; 8118 is non-polar and does not produce direct aluminium adhesion without corona discharge or an adhesive tie layer. Slip-agent selection should avoid excessive primary amide loadings in the sealant layer because plate-out on the seal bar can reduce seal integrity; converters should verify hot-tack retention by ASTM F1921-20 or equivalent in-line seal testing. Published data for this specific configuration is limited to converter qualification runs.

When Pallet Stretch Hood Film Demands Controlled Machine-Direction Tear Propagation

In pallet stretch hood conversion, the film is blown in a multi-layer configuration and subsequently stretched over a pallet load by a dedicated hooding machine; the critical resin requirements are retained elasticity, puncture resistance, and machine-direction tear propagation control during hood application. SABIC SUPEER mLLDPE 8118 is specified in the core or tie layer at 25–40 wt% of the total structure, with C4-LLDPE or EVA-rich outer layers at 60–75 wt% to produce the surface cling and stretch force demanded by the hooding cycle. Industrial packaging compliance is typically limited to REACH Regulation (EC) No 1907/2006 and the RoHS directive 2011/65/EU when the packaging enters electrical/electronic supply chains; no direct food-contact documentation is required for this non-food logistics format.

Processing is performed on three-layer blown film lines with die gaps of 2.0–2.8 mm and blow-up ratios between 2.5:1 and 3.5:1; melt temperatures are held at 190–220 °C. The resulting film is produced at thicknesses of 40–70 µm and tested for tensile elongation at break according to ISO 527-3:2018, with machine-direction Elmendorf tear resistance measured by ASTM D1922-15a as a direct indicator of resistance to crack propagation during the stretching sequence. End-product applications include hooded pallets for beverages, building materials, and chemical drums, where the tubular film is cut and sealed to a gusseted hood profile. The operational constraint is the balance between cling and elongation; a high mLLDPE fraction above 40 wt% can reduce surface tack to the point where pallet load retention fails in high-shrinkback hooding cycles, so layer distribution must be confirmed on the pallet unitization line.