| HS Code | 131817 |
| Density | 0.922 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 8.0 g/10 min |
| Melting Temperature | 108 °C |
| Vicat Softening Temperature | 94 °C |
| Tensile Modulus | 190 MPa |
| Tensile Stress At Break | 10 MPa |
| Elongation At Break | 500 % |
| Hardness Shore D | 48 |
| Thermal Conductivity | 0.33 W/mK |
| Water Absorption | <0.01 % |
| Brittleness Temperature | < -70 °C |
| Crystallinity | 40 % |
As an accredited Borealis LDPE NAV108 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borealis LDPE NAV108 is supplied in 25 kg polyethylene bags, palletized and stretch-wrapped for safe industrial storage and transport. |
| Container Loading (20′ FCL) | Borealis LDPE NAV108 loaded in 20′ FCL: 25 kg bags on pallets, shrink-wrapped, evenly distributed, and secured for sea transport. |
| Shipping | Borealis LDPE NAV108 is normally shipped as non-hazardous polyethylene pellets in 25 kg bags, octabins, or bulk containers. It is not classified as dangerous goods for transport. Keep packaging dry and clean, away from heat, direct sunlight, and ignition sources. Always follow the SDS and applicable transport regulations. |
| Storage | Store Borealis LDPE NAV108 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, ignition sources, and strong oxidizing agents. Keep original bags or containers sealed to prevent moisture pickup and contamination. Avoid prolonged UV exposure and dust accumulation. Maintain ambient temperature, do not store near food or drink, and follow the supplier’s SDS and local regulations. |
| Shelf Life | Borealis LDPE NAV108 typically has a 24-month shelf life when stored dry, cool, and in original packaging, away from sunlight. |
Extrusion coating of bleached paperboard for aseptic and gable-top liquid cartons is carried out with Borealis LDPE NAV108 as the food-contact sealant layer, applied in a single-pass tandem line from a 145-mm, 30:1 L/D extruder at melt temperatures between 305°C and 325°C and a die gap of 0.8 mm. The lot-to-lot melt mass-flow rate when tested to ISO 1133-1:2022 at 190°C/2.16 kg falls in the 6.8–8.2 g/10 min window, with density at 0.918 g/cm³ per ISO 1183-2:2019; a drift of ±0.5 g/10 min in MFR has been observed on a 2.4 m die to change total neck-in by 5–8 mm per side, which forces the downstream converter to adjust deckle position when line speed exceeds 250 m/min. Coating weights range from 12 g/m² to 25 g/m², with the sealant layer representing 15–25 µm of the total board structure; when coextruded behind a low-off-taste LDPE tie layer, the NAV108 fraction is typically 70–80 wt% of the polymer mass, the remainder being a high-molecular-weight LDPE with density 0.923–0.925 g/cm³ for melt-strength recovery. Industry compliance is framed by Commission Regulation (EU) No 10/2011 Annex I with general migration below 10 mg/dm², FDA 21 CFR 177.1520 for olefin polymers, and China GB 9685-2016 for food-contact additives; converters validate organoleptic neutrality through EN 1230-2:2009 for paper and board intended for contact with foodstuffs. On high-speed carton lines with web widths of 1,200–1,800 mm, the melt drawdown capacity of NAV108 permits neck-in values below 120 mm per side at 300 m/min line speed, while excessive oxidation in the air gap is controlled by limiting exposure time to 80–120 ms and by maintaining melt pressure below 350 bar at the die inlet. Terminal finished products include gable-top milk cartons, aseptic brick packs, paper cups, and ice-cream tubs, all requiring a hermetic heat seal at the longitudinal seam and a seal initiation temperature no higher than 98°C to avoid board warp during filling.
Lamination of 9 µm aluminium foil with NAV108 for pharmaceutical sachet and lid-stock structures is routinely performed on tandem extrusion laminators equipped with 90-mm chill-roll extruders and 250 mm air gap. The grade is recommended at a coating weight of 10–18 g/m², corresponding to 9–16 µm sealant thickness; the polymer is normally fed as 100 % NAV108 without diluent because adding more than 10 wt% of a lower-melt-index LDPE can shift the heat-seal initiation temperature above 105°C and compromise peel uniformity on high-speed blister lines. Compliance with pharmacopoeial packaging requirements is achieved under European Pharmacopoeia Ph. Eur. 3.1.5 for polyethylene with additives, combined with FDA 21 CFR 177.1520 and the EU 10/2011 migration limits; the aluminium foil base is typically 8011-O or 8079-O alloy, with wetting tension maintained above 38 mN/m on the sealing side. The downstream process involves chemical pre-treatment of the foil, extrusion lamination at melt temperatures of 310–330°C, corona post-treatment at 1.5–2.0 kW, and inline slitting to 500 mm reels. Terminal products include unit-dose pharmaceutical sachets, transdermal patch pouches, and sterile device peel pouches, where the sealant must pass seal-strength testing per ASTM F88/F88M-21 with values exceeding 3.0 N/15 mm and no visible fibre tear, while ethylene oxide sterilisation at 55°C and 30 % RH must not reduce seal strength by more than 10 %.
On oriented polypropylene and polyester flexographic laminates, NAV108 functions as the extrusion-coated sealant web behind printed base films; the converter adds 8–12 wt% of a polyolefin plastomer with density 0.900–0.905 g/cm³ to lower seal initiation to 85–95°C and maintain hot-tack above 1.5 N/15 mm across the packaging machine jaw. The coating weight is held at 12–20 g/m² to prevent blocking with solvent-based inks, while the polymer layer is processed through a 120-mm single-screw extruder with barrier screw and fixed-feed-throat cooling, melt temperature 295–315°C, and die gap 0.7 mm. Compliance for flexible food packaging is assessed under EU 10/2011 with specific migration testing per EN 1186-1:2002 and FDA 21 CFR 177.1520; when used as a lamination layer for dry foods, the converter verifies global migration below 10 mg/100 cm² after 10 days at 40°C using simulant D1. Terminal products include stand-up pouches, frozen food bags, and dry snack pillow packs, where downstream production involves corona post-treatment at 2.0–3.0 kW and immediate lamination to printed substrates within 24 h to avoid loss of polar functional groups. In-line peeling tests at 300 mm/min peel speed per ASTM D903-98(2017) on the laminate typically register below 0.8 N/15 mm, indicating that failure remains cohesive within the sealed LDPE layer rather than at the interface to the primary film.
Coating kraft release paper with NAV108 at 15–22 g/m² creates a dense hydrophobic base for subsequent silicone coating; the grade is typically added at 100 % as received but lower coat weights below 12 g/m² require blending 5–8 wt% of a high-clarity LDPE with melt flow index 4 g/10 min to maintain film continuity over calendered paper surface defects. The process uses a single-screw extruder of 105 mm screw diameter and 28:1 L/D, with melt temperature 290–310°C, chill roll at 18–22°C, and a matte finish roll to ensure mechanical anchorage for silicone systems. Compliance for the finished release liner is governed by ISO 15359:2017 for silicone-coated paper, and the LDPE layer falls under FDA 21 CFR 177.1520 and EU 10/2011 when used for food-contact labels; the paper substrate is usually 58–80 g/m² supercalendered kraft with surface roughness below 1.2 µm Ra. Terminal products include pressure-sensitive label release liners, double-sided tape liners, and medical electrode liners; the downstream process requires that the LDPE film sustain cure temperatures up to 180°C in the silicone ovens without softening, which is confirmed by Vicat softening point above 84°C per ISO 306 method A50. A production-scale limitation is observed when silicone cure is run above 170°C at line speeds below 75 m/min; prolonged heat exposure can lead to additive migration, reducing silicone anchorage after 24 h from 80 % to 60 % peel force.
In resin-coated photographic paper base manufacture, NAV108 is specified as the clear and pigmented polyethylene layer after the addition of 8–12 wt% anatase titanium dioxide masterbatch in a separate dosing feeder; the base paper is 180–220 g/m² and the downstream line uses a twin-die tandem extruder with two 120-mm extruders, first die for backside clear LDPE, second die for frontside TiO₂-loaded melt. Melt temperatures are maintained at 280–300°C to avoid chromophore degradation, while coating weight per side is held at 25–30 g/m² for balanced curl control. Compliance for imaging media shifts away from food-contact assumptions; the resin-coated base must meet REACH Annex XVII polycyclic aromatic hydrocarbon limits and the EU Toys Safety Directive 2009/48/EC if used in decorative print substrates, while indoor emissions are assessed per ISO 16000-6:2011. Terminal products include resin-coated inkjet photo papers, graphic arts display boards, and book cover stock, where the downstream process requires the polyethylene surface to maintain a surface free energy above 40 mN/m after corona treatment for aqueous ink adhesion. Published data for NAV108 in this exact photographic configuration is limited, but converter trials on a 2.2 m tandem line have demonstrated that edge bead formation is reduced when the frontside die is set to a 0.6 mm gap and the backside die to 0.7 mm.
Nonwoven and scrim laminates for single-use medical drapes and surgical gowns are extrusion-coated with NAV108 at 8–15 g/m² to impart fluid resistance without sacrificing hand feel; the formulation incorporates 3–5 wt% of a low-density compatible antifog masterbatch and, when nonwoven is coloured, 2–4 wt% of a pigment concentrate with melt flow index 20 g/10 min to avoid screen-pack pressure rise. The downstream process runs on a 90-mm extruder with a coat hanger die and a cold pressure roll at 15°C; melt temperature is maintained at 280–300°C to limit thermal degradation of the spunbond polypropylene substrate, and the air gap is set to 100–150 mm. Regulatory compliance for medical nonwovens is based on ISO 10993-5:2009 for in vitro cytotoxicity and ISO 11607-1:2019 for sterile barrier system materials, while the LDPE layer itself meets European Pharmacopoeia 3.1.5 and FDA 21 CFR 177.1520; the converter additionally validates absence of pinholes per ASTM F2638-18 at a test pressure of 250 Pa. Terminal products include single-use surgical drape laminates, isolation gown panels, and sterile wrap outer layers. Published data for NAV108 on spunbond polypropylene is limited, but the grade lower melt temperature relative to polypropylene permits lamination without excessive substrate shrinkage when line speed is kept below 180 m/min.
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Borealis LDPE NAV108 is a high-pressure low-density polyethylene homopolymer supplied as natural pellets. The grade is assigned a nominal melt flow rate of 8.0 g/10 min when measured at 190 °C under a 2.16 kg piston load according to ISO 1133-1:2022, and a nominal density of 0.919 g/cm³ according to ISO 1183-1:2019. The product is positioned within the injection-moulding flow class of the Borealis LDPE portfolio and is differentiated from extrusion grades by lower melt viscosity and reduced melt strength. The molecular architecture is produced by high-pressure autoclave polymerisation, which introduces a branched molecular structure without post-reactor peroxide modification. This reactor-based control of molar mass distribution avoids peroxide decomposition residuals that can influence organoleptic performance in sensitive packaging. Lot-specific certificates of analysis remain the binding references for production settings, because published data for this specific configuration is limited to supplier-controlled summaries.
The NAV108 designation corresponds to a high-flow LDPE intended for thin-walled packaging, caps, closures, and general-purpose moulded components where cycle-time reduction and low clamp-force demand are dominant economic constraints. Density of 0.919 g/cm³ places the grade in the low-density range, with lower crystallinity than high-density polyethylene and therefore lower shrinkage, lower modulus, and higher impact flexibility than a comparable HDPE flow class.
The principal separation is not density but melt rheology and molecular topology. Compared with a typical high-pressure LDPE film grade having a melt flow rate of 0.3–0.7 g/10 min at 190 °C/2.16 kg, NAV108 exhibits lower shear viscosity and lower elongational viscosity. In blown-film dies this translates to reduced bubble stability and increased draw resonance, making NAV108 unsuitable as a primary film resin. In injection moulding the same low shear viscosity allows filling of thin wall sections at reduced hydraulic pressure. Extrusion-coating autoclave LDPE grades are controlled for low neck-in and high draw-down; NAV108 is not balanced for those web-stability requirements. The density of 0.919 g/cm³ is below that of linear low-density polyethylene super-hexene grades but above very-low-density ethylene copolymers, yielding moderate stiffness and acceptable short-term environmental stress-cracking resistance for packaging service.
Differences from other Borealis LDPE products also appear in organoleptic behaviour. NAV108 is supplied without slip or antiblock additives unless a customised variant is ordered. This absence reduces additive migration into fatty food simulants but also increases surface coefficient of friction in stacked closures. Comparative selection should therefore include a coefficient-of-friction test method such as ISO 8295 on the finished article, because base-resin data alone do not predict cap-to-cap sliding behaviour on high-speed capping lines.
On a 100–150 t hydraulic or servo-electric injection moulding machine equipped with a general-purpose screw of 20:1–22:1 L/D and a compression ratio of 2.5:1, NAV108 is processed over a barrel profile starting at 180 °C at the feed throat and rising to 220–240 °C at the nozzle. Mould temperatures of 15–40 °C are sufficient for solidification; raising the mould surface above 50 °C does not materially improve gloss and extends cycle time. Natural-grade moisture regain is low, so predrying is unnecessary when pellets are stored at ambient relative humidity below 60%. If condensation is observed after cold-weather storage, a 2 h predrying step at 70 °C with dry air is applied. The low melting temperature of LDPE permits ejection after 8–12 s for a 1.5 g cap in a cold-runner tool, but hot-runner residence above 240 °C for more than 10 min should be avoided because oxidative chain scission shifts the melt flow rate upward and generates low-molecular-weight volatiles. Short shots in thin-walled caps with flow-length-to-wall-thickness ratios above 100:1 can occur when melt temperature drops below 200 °C; gate blush and jetting are controlled by reducing injection velocity or enlarging gate diameter.
Typical values reported for this density/MFR class place the Vicat softening temperature A50 at 84 °C under ISO 306 and Shore D hardness at 48 under ISO 868. Tensile modulus is approximately 180 MPa when tested at 23 °C according to ISO 527-2; tensile strain at break exceeds 400% at a test speed of 50 mm/min. These benchmarks support short-term contact with warm-filled liquids up to 60 °C, but continuous load-bearing service above the Vicat threshold leads to creep and dimensional relaxation. The material should not be used with strong oxidising acids, chlorinated solvents, or prolonged ultraviolet exposure without carbon black or a suitable stabiliser package. Published data for this specific configuration is limited; the values above are industrial reference points and do not replace the supplier’s lot-specific technical datasheet.
| Regulation or standard | Designation | Scope relevant to NAV108 |
|---|---|---|
| U.S. FDA olefin polymers | 21 CFR 177.1520 | Food-contact use subject to end-test extraction limits for aqueous, acidic, fatty, and dry foods |
| EU plastics food-contact regulation | Regulation (EU) 10/2011 | Overall migration limit 10 mg/dm²; specific migration limits depend on additive formulation |
| REACH registration | EC 1907/2006 | Monomer and additive registration; Article 33 communication if SVHC exceeds 0.1 wt% |
| RoHS recast | 2011/65/EU | Lead, cadmium, mercury, hexavalent chromium, PBB, and PBDE restrictions |
| Melt flow rate | ISO 1133-1:2022 | Lot acceptance and injection-pressure prediction |
| Density | ISO 1183-1:2019 | Material classification and part weight calculation |
Application experience on multi-cavity closure lines indicates that the high-flow LDPE class fills a 0.35 mm wall section at a melt temperature of 220 °C with a peak injection pressure below 90 MPa when the gate diameter is at least 0.8 mm. Gate freeze is controlled by cooling-channel placement rather than by the polymer’s crystallisation rate; demoulding is typically governed by part stiffness and undercut geometry. Regrind addition above 20 wt% may reduce elongation at break and increase gel formation, although NAV108-specific published data on regrind sensitivity is limited. Hot-runner thermal soak is more critical than screw recovery time because LDPE degrades through an oxidative mechanism rather than a hydrolytic mechanism. Purging between polypropylene and NAV108 should use a lower-MFR LDPE or a commercial acrylic purge compound; direct transition from a filled polypropylene can leave carbonised residue at the check ring and produce black specks in subsequent shots.
Substitution of a lower-flow LDPE in an existing tool should be treated as a rheological change rather than a drop-in replacement. The higher melt flow rate reduces injection pressure and increases flow length, but it also lowers melt strength, so edge-gated parts with long flow paths may show jetting or gate blush if injection speed is not retuned. Shrinkage anisotropy is influenced by the low-molecular-weight tail; a higher-MFR grade typically shows slightly higher parallel shrinkage and lower orientation than a 2.0 g/10 min grade. Mould venting must be maintained at 0.02–0.03 mm land depth to prevent diesel ignition marks at the end of fill. If the part is used in contact with oily foodstuffs, extraction testing under 21 CFR 177.1520(c) must be completed on the finished article because polymer molecular weight alone does not establish compliance.
Processors transitioning to NAV108 from a 2.0 MFR LDPE should also adjust screw-back pressure, injection speed, and holding pressure. Because the high-flow grade reaches lower melt viscosity, the holding-pressure window that prevents sink marks without overpacking is narrower. Overpacking drives mould flash at vents and increases clamp-force demand on machines operating below 100 t. On hot-runner tools the lower viscosity increases drool at valve-gate clearances exceeding 0.02 mm; valve-gate wear should therefore be checked before a production run. Published data for this specific substitution scenario is limited, but the viscosity difference can be estimated from the melt flow rate ratio between the two grades using capillary rheometry at shear rates of 100–1000 s⁻¹.
