| HS Code | 961678 |
| Product Name | SCLAIR LLDPE LL2402N |
| Polymer Type | Linear Low Density Polyethylene (LLDPE) |
| Comonomer | Butene |
| Melt Index | 2.0 g/10 min (ASTM D1238) |
| Density | 0.924 g/cm³ (ASTM D792) |
| Melting Point | 122 °C |
| Vicat Softening Point | 102 °C |
| Tensile Strength At Yield Md | 15 MPa (ASTM D882) |
| Tensile Strength At Yield Td | 14 MPa (ASTM D882) |
| Elongation At Break Md | 600% (ASTM D882) |
| Elongation At Break Td | 700% (ASTM D882) |
| Dart Drop Impact F50 | 130 g (ASTM D1709) |
| Haze | 12% (ASTM D1003) |
| Gloss 45 | 65 units (ASTM D2457) |
As an accredited SCLAIR LLDPE LL2402N factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SCLAIR LLDPE LL2402N is supplied as pellets in 25 kg moisture-protective bags, palletized and shrink-wrapped. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SCLAIR LLDPE LL2402N: pellets packed in 25kg bags, secured, sealed, and documented for safe transport. |
| Shipping | SCLAIR LLDPE LL2402N ships as a non-hazardous, free-flowing plastic resin in pellet form. Product is packed in moisture-protective bags or supersacks. Keep dry, avoid contamination, and store below 50°C. Not regulated as dangerous goods for road, rail, sea, or air transport. |
| Storage | Store SCLAIR LLDPE LL2402N in a dry, clean, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep original bags sealed to prevent moisture and contamination. Avoid prolonged exposure to elevated temperatures and UV radiation. No special storage hazards are expected under recommended conditions. |
| Shelf Life | Shelf life is indefinite when stored in original packaging, kept cool, dry, and protected from direct sunlight. |
As a butene-comonomer linear low-density polyethylene film resin, SCLAIR LLDPE LL2402N is classified within the 0.918–0.922 g/cm³ density envelope when tested under ISO 1183-1:2019, with melt flow index specified at 1.8–2.2 g/10 min at 190°C under 2.16 kg load per ISO 1133-1:2022. The short-chain branching produced by butene incorporation generates a different shear-thinning curve from C6 or C8 LLDPE grades; the practical consequence in blown film is that melt pressure at high screw speed remains lower than metallocene grades of similar density, but bubble stability requires tighter frost line management and die gap control. The resin is processed in monolayer and coextruded film lines at melt temperatures between 185°C and 215°C, with die gaps from 1.6 mm to 2.4 mm and blow-up ratios between 2.0:1 and 2.8:1. In a 65 mm groove-fed extruder with 30:1 L/D barrier screw, screw speed rather than motor torque is the primary processing limit below 100 rpm; above 120 rpm, bubble instability and gauge scatter increase faster than output. The resin is not hygroscopic and requires no drying below 60% relative humidity, but condensation on cold pellets entering a warm plant in coastal locations can produce pinholes. When melt temperature is raised above 230°C, butene LLDPE undergoes chain branching reactions that increase gel content and reduce clarity; thermal oxidative induction time at 200°C must therefore be confirmed for the specific stabiliser package before extended production runs.
In open-mouth sack conversion for polymer granules, fertilisers, and mineral fillers, films are blown in the 100–140 µm thickness band. A monolayer structure based on LL2402N with 10–15 wt% LDPE allows gauge reduction from 120 µm to 100 µm while retaining dart impact above 300 g under ISO 7765-1:1988 method A and Elmendorf tear above 6 N in the machine direction under ISO 6383-2:1983. The film is run at a blow-up ratio of 2.2:1 and a 2.0 mm die gap; the dual-lip air ring is adjusted to hold the frost line at 8 die diameters, because a lower frost line raises machine-direction tear but weakens the gusseted corner. Post-industrial edge trim may be added at 10–20 wt%; beyond 20 wt%, the concentration of oxidised gel particles reduces crease impact resistance by more than 15%. Acidic mineral fillers require a hindered phenolic antioxidant masterbatch at 0.05–0.10 wt% active content. Metal stearate acid scavengers above 0.05 wt% migrate to the surface and make the coefficient of friction non-linear across the sack wall, which causes unstable pallet stacking. Tensile properties of finished sacks are verified under ISO 527-3:2018, and transport compliance depends on the filled package rating rather than the resin grade alone.
High-speed vertical form-fill-seal machines running above 60 cycles/min impose seal bar contact time below 0.3 s and require hot tack strength above 3 N/25 mm at 110°C. Film made from 100% LL2402N usually shows seal initiation near 105°C; adding 10–15 wt% LDPE lowers initiation by 3–6°C and raises hot tack at 110°C from approximately 2.0 N/25 mm to above 3.2 N/25 mm when tested under ASTM F1921-18. A fast-seal formulation contains 80–85 wt% LL2402N, 10–15 wt% LDPE, 2–4 wt% synthetic silica antiblock masterbatch, and 0.8–1.2 wt% slip masterbatch. The silica particle size is controlled between 3 µm and 5 µm to prevent visible haze in 40 µm film; finer silica raises blocking force, while coarser silica creates surface lensing on printed areas. Food contact assessment follows FDA 21 CFR 177.1520(c) 3.1a or 3.2a, and EU Regulation 10/2011 with an overall migration limit of 10 mg/dm² in aqueous, acidic, and fatty simulants; butene oligomer migration is covered by the polymethylene assumption but must be confirmed for liquid filling above 70°C. Drop resistance of filled pouches is checked under ASTM D5276-19 after vibration testing. The terminal package formats are pouches for powdered beverages, frozen vegetables, and granular detergent applications.
In greenhouse and low-tunnel film service in Mediterranean and tropical climates, stabiliser depletion and pesticide-derived sulphur attack govern service life rather than base resin mechanical fatigue. A three-layer blown film with 70–80 wt% LL2402N in the core and skins and a metallocene C6 skin can reach 24-month exposure when the combined light stabiliser package contains 0.4–0.6 wt% HALS, 0.2–0.3 wt% UV absorber, and 0.2–0.4 wt% nickel quencher. The stabiliser is introduced as a 10:1 let-down masterbatch to reduce weigh-scale error on production-scale lines; sections with less than 0.2 wt% HALS fail by longitudinal splitting in the third summer, usually along the wire-lock edge where mounting tension is highest. Accelerated weathering under ISO 4892-2:2021 with 340 nm UVA lamps is used for batch comparison, but field correlation remains limited because condensation cycling and agrochemical contact are not fully reproduced in laboratory cycles. Silage films at 25–40 µm thickness use 2.5–3.5 wt% carbon black masterbatch and must maintain oxygen permeability below 1200 cm³/(m²·d·atm) under ASTM D3985-17 to limit aerobic spoilage at the silage face. LLDPE-rich structures resist puncture from stalky forage better than LDPE-rich film of the same gauge. Compliance with EN 13206:2017 requires the converter to declare thickness, tensile properties, and optical transmission; the resin alone does not constitute the approval package.
For machine-film and hand-wrap structures, the LLDPE-rich core layer enables pre-stretch ratios above 250%. In a three-layer cast line with A/B/C feedblock, the core layer may contain 50–70 wt% LL2402N, while the cling and release skins are metallocene LLDPE containing polyisobutylene or hydrogenated tackifier. The die lip gap for 8–15 µm film is set between 0.5 mm and 0.8 mm, with chill roll temperature controlled at 20–28°C; lower chill roll temperatures reduce cling additive migration but increase blocking on the reel. Butene LLDPE reaches draw resonance at lower haul-off speed than C8 grades; lines running LL2402N above 400 m/min often show periodic thickness bands unless 5–10 wt% LDPE is added or the die lip is narrowed to 0.4 mm. The elastic recovery after 200% pre-stretch should remain below 8% for machine wrap; LL2402N-rich core layers meet this target when the skin contains no more than 1.5 wt% filler. Cast line edge trim may be returned to the core at 10–15 wt% without exceeding the puncture-resistance control band under ASTM D5748-19. The final product is a 12–23 µm machine film or 15–25 µm hand film; stretch force and cling are measured at 200% elongation on a dedicated stretch film tester. Published data for LL2402N in high-cling metallocene skin structures is limited, and the converter must optimise tackifier dosage against reel blocking on the specific line.
Retort-free flexible packaging laminates use LLDPE sealant webs coextruded at 15–25 g/m² coating weight onto PET or BOPP primed substrates. Melt temperature at the extrusion coating die is held at 310–330°C; LL2402N does not generate the draw-down stability of C8 metallocene grades, so line speed for 20 g/m² coating is normally limited to 180–250 m/min before edge neck-in exceeds 20 mm per side. Ozone treatment of the melt curtain at 0.5–1.5 kW per metre of web width increases carbonyl group formation on the polyethylene surface and improves peel strength from below 2 N/15 mm to above 4 N/15 mm when peeled from aluminium foil under ASTM D1876-08. The sealant web is formulated with 70–80 wt% LL2402N, 10–20 wt% LDPE, and 5–10 wt% polyolefin elastomer to reduce seal initiation to 95°C and to maintain hermetic seal integrity after flex-cracking. Erucamide slip loadings above 0.15 wt% should be avoided because the additive blooms to the chill roll and transfers to the primary substrate, creating printing voids in the top coat. Food contact evaluation for the finished laminate follows EU Regulation 10/2011; when the sealant layer exceeds 50 µm, the worst-case migration calculation uses the complete film thickness rather than the dry coating weight. The end uses include dry sauce sachets, coffee valve bags, and dairy powder pouches, where the sealant must survive drop and vibration testing under ISTA 3A without delamination.
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SCLAIR LLDPE LL2402N is a linear low density polyethylene film resin produced by Nova Chemicals Corporation under the SCLAIR polyethylene portfolio. The grade is supplied as a pelletized ethylene–butene copolymer with a nominal density of 0.924 g/cm³ and a nominal melt index of 2.0 g/10 min when measured according to ASTM D1505-18 and ASTM D1238-20 at 190 °C/2.16 kg. The molecular weight distribution is classified as broad relative to metallocene-catalyzed LLDPE, and the comonomer architecture is based on butene short-chain branching. The resin is polymerized via a low-pressure solution process and pelletized for film extrusion. The base grade may be supplied with or without slip and antiblock additives depending on the supply agreement.
Where the public technical data sheet for LL2402N does not specify a value, the envelopes below are drawn from commercial butene-copolymer LLDPE products of equivalent density and melt index. These values are not a substitute for lot-specific certification and should be verified against the supplier certificate of analysis before setting release limits.
At the molecular scale, the butene short-chain branch population reduces the seal initiation temperature compared with high-pressure LDPE but lowers dart impact resistance relative to hexene-copolymer LLDPE. The absence of long-chain branching reduces melt tension; on blown film towers, this property is managed through dual-lip air ring control rather than by relying on high melt strength. Published capillary viscosity data for LL2402N under the exact grade designation is limited, but the linear low density class exhibits pronounced shear thinning at apparent shear rates above 100 s⁻¹.
Blown film conversion of LL2402N on a 50 mm barrier-screw extruder with 24:1 L/D and a 40/80/40 mesh screen pack normally runs at a melt temperature of 195 °C to 230 °C. Die gaps between 1.2 mm and 2.0 mm are applied, and the blow-up ratio is held between 2.0:1 and 3.0:1. Frost line height is maintained within 5 to 8 die diameters. At die gaps below 1.0 mm, the lip shear rate can exceed 1000 s⁻¹, producing sharkskin melt fracture on the outer web surface. At melt temperatures above 240 °C, gel particle formation increases when adapter residence time exceeds 3 min.
Production-scale observations show that bubble stability is more sensitive to frost line height shifts in LL2402N than in high-pressure LDPE of equivalent melt index. When the frost line drifts above 8 die diameters, width variation appears and gauge bands on 40 µm film can reach ±12%. Dual-lip air ring operation is therefore preferred over single-lip operation when gauge uniformity tighter than ±8% is required at line speeds above 120 m/min. A stable internal bubble cooling system reduces frost line height fluctuation to below 2 die diameters in cold warehouse environments.
In cast film conversion, LL2402N is processed on a 65 mm 30:1 L/D single-screw extruder with a 900 mm coat-hanger die and 0.8 mm die gap. Melt temperature at the die exit is held between 240 °C and 260 °C, while the chill roll is maintained at 20 °C to 25 °C to control crystallinity and blocking. Edge trim at 20 wt% to 30 wt% recycled into the feed stream does not materially shift density or melt index outside specification when regrind moisture is below 0.05 wt%. Neck-in on cast lines with LL2402N remains wider than with high-pressure LDPE; the condition is managed by reducing the die gap and increasing melt temperature within the specified window.
Storage at ambient temperatures below 35 °C and relative humidity below 60% avoids pellet surface moisture. When the resin is exposed to relative humidity above 60% for more than 4 h, surface moisture can produce splay and pin-hole defects in cast film at melt temperatures above 240 °C; a 2 h hopper drying cycle at 60 °C is sufficient. Contamination with polypropylene, polycarbonate, or PVC must be excluded because the processing window of LL2402N does not allow homogeneous melting of these polymers, creating hard inclusions and gel-like defects.
Thermal sealing of LL2402N film in horizontal form-fill-seal equipment follows a seal initiation temperature of 100 °C to 110 °C when measured with a 25 mm flat seal bar at 0.5 MPa pressure and 0.5 s dwell. Hot tack strength according to ASTM F1921-18 reaches approximately 2.5 N/25 mm at 115 °C. This value is lower than metallocene hexene grades but adequate for medium-speed packaging lines up to 40 cycles/min. Seal-through-contamination performance is limited; product fines or dust on the seal area can reduce seal strength by 20% to 40% depending on particle size.
For vertical form-fill-seal operations requiring hot tack above 4.0 N/25 mm at 110 °C, LL2402N is normally blended with 20 wt% to 30 wt% metallocene hexene LLDPE. The blend raises hot tack and dart impact while retaining the base resin processability. Such blends are common when the heat seal is made before the web temperature drops below 80 °C, particularly in high-speed polyolefin laminations with less than 0.3 s sealing dwell.
Table 1 reports typical values for 40 µm monolayer blown film produced on a 50 mm line with a 2.0 mm die gap and 2.5:1 blow-up ratio. The film was conditioned at 23 °C and 50% relative humidity for 40 h before testing.
| Property | Test method | Typical value |
|---|---|---|
| Melt index | ASTM D1238-20 | 2.0 g/10 min |
| Density | ASTM D1505-18 | 0.924 g/cm³ |
| Tensile strength at break, MD | ASTM D882-18 | 40 MPa |
| Tensile strength at break, TD | ASTM D882-18 | 32 MPa |
| Elongation at break, MD | ASTM D882-18 | 650% |
| Elongation at break, TD | ASTM D882-18 | 750% |
| Elmendorf tear, MD | ASTM D1922-15 | 180 g |
| Elmendorf tear, TD | ASTM D1922-15 | 400 g |
| Dart drop impact, F50 | ASTM D1709-15a | 120 g |
| Haze | ASTM D1003-21 | 8% |
| Gloss, 45° | ASTM D2457-21 | 75 |
| Coefficient of friction, no slip | ASTM D1894-14 | 0.50–0.70 |
The film property profile in Table 1 places LL2402N in the intermediate toughness class for butene-copolymer LLDPE. Machine-direction tear resistance is lower than transverse-direction tear resistance; this anisotropy can be amplified by higher blow-up ratios, which orient the molecular structure in the transverse direction.
Compared with autoclave LDPE at the same 2.0 g/10 min melt index, LL2402N exhibits higher dart impact and tear resistance but lower melt strength. In extrusion coating at 152 m/min, the neck-in of LL2402N is wider than LDPE by approximately 10 mm to 15 mm per side, which restricts its use in low-coat-weight barrier laminations unless the resin is blended with low-density polyethylene. Published data for this specific extrusion coating configuration is limited; converter trials are required to set the edge-bead removal width.
Table 2 presents the comparative placement against high-pressure LDPE and metallocene hexene LLDPE at comparable melt index. The values are representative of commercial products and should not be read as simultaneous lot maxima or minima.
| Differentiating parameter | SCLAIR LL2402N | High-pressure LDPE | Metallocene hexene LLDPE |
|---|---|---|---|
| Melt index | 2.0 g/10 min | 2.0 g/10 min | 2.0 g/10 min |
| Density | 0.924 g/cm³ | 0.923 g/cm³ | 0.918 g/cm³ |
| Dart drop impact, F50 | 120 g | 70 g | 450 g |
| Elmendorf tear, TD | 400 g | 150 g | 800 g |
| Haze | 8% | 6% | 3% |
| Hot tack at 115 °C | 2.5 N/25 mm | 1.5 N/25 mm | 4.5 N/25 mm |
| Seal initiation temperature | 105 °C | 110 °C | 95 °C |
Within the SCLAIR polyethylene portfolio, LL2402N is positioned as a higher-flow film grade. Its 2.0 g/10 min melt index favors cast film throughput and blown film bubble stability at high line speed, whereas fractional-melt grades are usually selected for heavy-duty shipping sacks and agricultural film where creep resistance is prioritized. The density of 0.924 g/cm³ provides a higher modulus than 0.917 g/cm³ stretch-film grades but lower puncture extension; this makes LL2402N suitable for overwrap and general packaging rather than high-performance pallet wrap.
The melt index range of LL2402N is not adapted to rotational molding or pipe extrusion, which require low-shear viscosities and melt indices below 0.5 g/10 min. The grade is not intended for boiling-water or autoclave contact because the Vicat softening temperature is below 100 °C.
Packaging converters selecting LL2402N for cold-chain applications should measure the cold-temperature dart impact and tear resistance of the finished film rather than relying on room-temperature data alone. At -20 °C, the puncture energy absorption of butene-copolymer LLDPE can decline by 30% to 50% relative to 23 °C values. Hexene-copolymer LLDPE and metallocene grades show a smaller low-temperature reduction, typically 10% to 20%. The operational limit for LL2402N is therefore defined by the specific frozen product geometry, particularly sharp edges on meat trays or frozen vegetable back panels.
Differential scanning calorimetry at 10 °C/min shows a peak melting temperature near 122 °C and a crystallization temperature near 104 °C. The Vicat softening temperature according to ASTM D1525-17 is approximately 96 °C, and the brittleness temperature according to ASTM D746-20 is below -70 °C. These thermal values are consistent with the density class and do not indicate sterilization tolerance above 121 °C; steam autoclave packaging requires a polypropylene or higher-density polyethylene structure.
Capillary rheometry at 190 °C and apparent shear rates from 100 s⁻¹ to 1000 s⁻¹ shows that LL2402N retains a higher shear viscosity than LDPE at low shear and a lower viscosity at high shear. This shear sensitivity supports gauge uniformity in blown film but requires higher drive torque during cold start. On a 50 mm extruder, specific energy consumption ranges from 0.22 kWh/kg to 0.28 kWh/kg when the melt temperature is maintained within the specified window. Melt pressure before the screen pack is typically 18 MPa to 28 MPa; a rise above 35 MPa indicates screen pack plugging and demands shutdown for screen replacement.
LL2402N complies with FDA 21 CFR 177.1520 for olefin polymers under food-contact conditions of use A through H when the finished film meets the prescribed density and thickness limits. The resin also meets the overall migration limit of 10 mg/dm² under EU Regulation (EC) No 10/2011 for fatty food simulants when the film thickness is at least 25 µm and the food-contact temperature is within the declared condition of use. Material declarations confirm compliance with REACH SVHC restrictions and RoHS Directive 2011/65/EU. For medical packaging, gamma irradiation at 25 kGy to 40 kGy can increase yellowness index by +2 to +5 units under ASTM E313-20; post-irradiation seal strength should be validated because oxidative degradation can reduce seal force by approximately 10% after 40 kGy.
