| HS Code | 763366 |
| Density | 0.936 g/cm³ |
| Melt Flow Rate 190 C 2 16 Kg | 3.8 g/10 min |
| Melting Point | 123 °C |
| Vicat Softening Temperature | 85 °C |
| Tensile Strength At Yield | 12 MPa |
| Elongation At Break | 500% |
| Flexural Modulus | 700 MPa |
| Shore D Hardness | 55 |
| Escr 10 Antarox F50 | >1000 h |
| Brittleness Temperature | -75 °C |
| Charpy Impact Strength 23 C | No break |
| Charpy Impact Strength 40 C | No break |
As an accredited Borouge Borstar LLDPE LE8706 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borouge Borstar LLDPE LE8706 is supplied as free-flowing pellets in 25 kg bags, with bulk quantities available on request. |
| Container Loading (20′ FCL) | Borouge Borstar LLDPE LE8706 is packed in 25 kg bags and loaded as palletized cargo in a 20-foot FCL container. |
| Shipping | Borouge Borstar LLDPE LE8706 ships as non-hazardous polyethylene pellets in standard bags or bulk containers. Protect from moisture, direct sunlight, and excessive heat during transport. Keep packaging intact and store in a clean, dry area to prevent contamination and preserve material quality. |
| Storage | Store Borouge Borstar LLDPE LE8706 in a cool, dry, clean, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture pickup and contamination. Avoid dust accumulation; if stored in silos, use inert gas blanketing. Maintain temperature below 50°C. |
| Shelf Life | Borouge Borstar LLDPE LE8706 has a shelf life of at least one year when stored in original, unopened packaging under dry conditions. |
On a production-scale high-stalk blown film line configured with a 70 mm grooved-feed extruder and 30:1 L/D barrier screw, Borouge Borstar LLDPE LE8706 is typically placed in the core of a three-layer heavy-duty sack film. A common starting layer distribution is 10–15 wt% outer layer, 70–80 wt% core, and 10–15 wt% inner layer. The outer and inner layers contain 20–30 wt% LDPE to increase bubble stability, while the core operates at 90–100 wt% LE8706 with 0.03–0.08 wt% fluoropolymer process additive. Extruder temperature settings range from 170 °C in the feed zone to 220 °C in the adapter, with die zones held at 210–230 °C. A 1.8–2.0 mm die gap is used because a narrower 1.2 mm gap raises wall shear rate above 800 s⁻¹ and can initiate sharkskin on the inner surface. The bubble is operated at a blow-up ratio of 2.0–2.4 and a stalk height of 8–10 die diameters. Film thickness for 25–50 kg sacks is generally 80–120 µm, and line output on the 70 mm extruder is maintained at 220–280 kg/h. Above 300 kg/h, frost line height tends to shift beyond 12 die diameters and bubble oscillation begins. Sacks are sewn open-mouth or glued pinch-bottom formats for cement, fertilizer, polymer granules, and petrochemical masterbatch. Tensile properties are tested by ISO 527-3:2018, tear resistance by ISO 6383-2:1983, and dart impact by ISO 7765-1:1988 method A.
Compliance for dangerous goods packaging requires the filled sack to pass drop and stacking tests under 49 CFR 178.603 and 49 CFR 178.604. For non-hazardous fertilizer or cement sacks, converters commonly use a 1.2 m drop height on 25 kg fill weight. The film must also pass puncture and tear tests according to ASTM D1922-23 or ISO 6383-2:1983, depending on the market. Outdoor storage of filled sacks for more than 6 months requires a carbon black masterbatch at 2–3 wt% or an equivalent UV stabilizer package. Without additivation, LLDPE film embrittles through chain scission under cumulative ultraviolet exposure. The finished sack film should not be used in contact with strong oxidizing acids such as nitric acid above 60 °C. Melt mass-flow rate of each blend layer is checked by ISO 1133-1:2022 at 190 °C under 2.16 kg load to prevent layer viscosity mismatch and interfacial instability.
| Compliance check | Standard designation | Equipment / method |
|---|---|---|
| Tensile properties of film | ISO 527-3:2018 | Universal tensile tester, 500 mm/min, 15 mm strip width |
| Elmendorf tear resistance | ISO 6383-2:1983 | Elmendorf pendulum, 6400 g capacity |
| Dart impact resistance | ISO 7765-1:1988 method A | Falling dart tester, 38 mm hemispherical head |
| Filled sack drop test | 49 CFR 178.603 | Drop tower, packing group II height |
| Stacking stability | 49 CFR 178.604 | Compression stack frame, 40 °C for 28 days |
Greenhouse and silage cover lines running LE8706 as a core toughness layer convert the resin in three-layer structures. In a greenhouse cover formulation, 100 parts of LE8706 are blended with 60–80 parts of LDPE and 20–30 parts of EVA containing 14–18% vinyl acetate. The additive package includes 0.5–1.0 parts HALS masterbatch, 0.2–0.5 parts UV absorber masterbatch, and 0.3–0.8 parts antifog masterbatch. Silage cover or bale wrap formulations replace the antifog system with 2–4 wt% carbon black masterbatch or 3–5 wt% TiO₂ white masterbatch to limit infrared transmission. Extrusion temperatures are held at 190–220 °C. Residence time above 220 °C is kept below 15 minutes to minimize EVA degradation. The die gap is set at 1.2–1.6 mm, the blow-up ratio at 2.0–2.5, and frost line height at 5–7 die diameters. Greenhouse cover film is typically 150–200 µm, while silage bale wrap is 25–40 µm. Optical properties are measured by ISO 14782:2018 for haze and ISO 527-3:2018 for tensile strength. Artificial weathering is conducted under ISO 4892-2:2013 xenon arc conditions.
The main agricultural film constraint is additive migration. Low-molecular-weight antifog esters migrate to the surface within 48–72 h at 40 °C; if slitting occurs before this period, the surface layer is removed and antifog performance drops. Silage wrap requires controlled anaerobic fermentation; film must maintain puncture resistance after stretched wrapping around a 1.2 m round bale. Compliance in the European market references EN 13206:2017 for agricultural and horticultural covers. REACH 1907/2006 obligations apply to stabilizer masterbatch components. Outdoor exposure data for the specific LE8706 configuration is limited; lot-specific weathering trials are required before multi-year greenhouse guarantees are issued. Pre-drying is not required at indoor relative humidity below 60%. When coils are transferred from cold storage to a warmer hall, surface condensation may occur; hopper drying at 60 °C for 2 h prevents bubble defects.
The most common production conflict in pallet stretch hood extrusion is the attempt to downgauge from 80 µm to 50 µm without losing bubble stability. LE8706 is used in the core of a five-layer film. Outer cling layers are metallocene LLDPE at 10–15 wt% each; the core contains 70–80 wt% LE8706; the sub-skin layers are blends of 50–60 wt% LE8706 and 40–50 wt% metallocene LLDPE. A five-layer line with 60 mm outer extruders and a 90 mm core extruder, each at 30:1 L/D, operates the core at 210–230 °C and outer layers at 200–220 °C. Die gap is 1.4–1.6 mm. Blow-up ratio is held at 3.0–3.8. When bubble oscillation amplitude exceeds ±3 mm at the frost line, capacitive thickness gauges record variation above ±5%. Pallet wrapping tests then show breakage rates above 1 per 1,000 cycles. To return to stable processing, output is reduced by 10–15% or stalk height is increased by 2–3 die diameters. Stretch hood film is applied at 50–70% elongation on pallet wrapping equipment.
Compliance for industrial stretch hood film is governed by REACH 1907/2006 and EU packaging directive 94/62/EC. The packaging directive limits combined lead, cadmium, mercury, and hexavalent chromium to 100 mg/kg by weight. Puncture resistance is measured by ASTM D5748-23. Elastic recovery is tested by ASTM D5459-22. Tensile properties are measured by ISO 527-3:2018. The terminal product is a 50–80 µm pallet hood for chemical pellet bags, paper sacks, and white goods. The film should not be stored at temperatures exceeding 30 °C because cling additive migration increases blocking risk. This stretch hood application does not require food-contact compliance unless the wrapped goods impose a specific supply-chain migration specification.
In lamination lines where a polyethylene sealant web is bonded to metallized PET or oriented polyamide, LE8706 is converted as a three-layer blown film. The layer distribution is 15–20 wt% heat-seal skin, 60–70 wt% core, and 15–20 wt% lamination skin. The heat-seal skin contains 70–80 wt% LE8706 and 20–30 wt% metallocene LLDPE to reduce seal initiation temperature to 95–105 °C. The core is 100 wt% LE8706. The lamination skin is corona-treated to 38–40 mN/m wetting tension measured by ASTM D2578-23. Film thickness is 40–60 µm. Extrusion uses a 1.2 mm die gap, blow-up ratio of 2.0–2.4, and frost line height of 5–7 die diameters. Heat-seal strength is targeted at 12–18 N/15 mm at 140 °C jaw temperature, 0.2 MPa sealing pressure, and 0.5 s dwell, measured by ASTM F88-21. Hot-tack strength is measured by ASTM F1921-20.
Food-contact compliance is verified against EU Regulation 10/2011 Annex II for overall migration below 10 mg/dm² under conditions of use, and against FDA 21 CFR 177.1520 for olefin polymers if a valid grade-specific regulatory certificate exists. The sealant web is not suitable for retort pouches operating above 121 °C; cast polypropylene sealant is required for high-temperature retort. Corona treatment above 42 mN/m can reduce hot-tack performance through surface oxidation. Terminal products are spouted pouches for liquid detergent, bag-in-box liners for sauces, and stand-up pouches for dry foods. No pre-drying is required at normal indoor humidity; if cold-stored coils show surface condensation, hopper drying at 60 °C for 2 h is used before film extrusion.
Collation shrink lines operating a double-bubble process use LE8706 in the core to increase shrink force and puncture resistance. The primary tube is extruded at 190–210 °C, quenched to 25–35 °C, then reheated in a hot-air tunnel at 95–115 °C and inflated to a transverse draw ratio of 2.5–3.0 and machine draw ratio of 2.0–2.5. A three-layer collation film uses 70–80 wt% LE8706 in the core and 20–30 wt% LDPE in the skins to reduce blocking. Free shrink is measured by ASTM D2732-20, and shrink tension by ASTM D2838-18. Comparative shrink force data for the specific Borouge grade is limited; converters validate the shrink curve on their own line. The secondary bubble is collapsed with cooling air at 15–20 °C. If the collapse frame temperature exceeds 30 °C, blocking occurs. Film thickness is 35–60 µm. Shrink tunnel temperature non-uniformity above ±5 °C across the web causes banding and local loss of shrink force.
Compliance in the European market is governed by 94/62/EC packaging waste rules, including a combined heavy-metal limit of <100 mg/kg for lead, cadmium, mercury, and hexavalent chromium. The terminal product is printed collation shrink film for 1.5 L bottle six-packs and canned goods. LE8706 levels above 80 wt% increase secondary bubble sensitivity to temperature deviation; tunnel calibration thermocouples are placed at 5 points across the web and dwell time is held at 1.5–2.5 s. The film should not be stored above 30 °C before shrinking because free shrink starts prematurely in warm warehouses and alters the final label position.
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Borouge Borstar LLDPE LE8706 is a butene-based linear low-density polyethylene produced by the Borstar bimodal slurry-loop/gas-phase cascade. The grade designation LE8706 identifies a film resin with a nominal density of 0.918 g/cm³ when tested according to ISO 1183-1 and a melt flow rate of 1.0 g/10 min at 190 °C under 2.16 kg in ISO 1133-1. Differential scanning calorimetry according to ISO 11357-3 typically shows a peak melting temperature of approximately 122 °C. The standard formulation contains antioxidant stabilization plus slip and antiblock additives; it is not a filled or reinforced compound. The molecular architecture is bimodal: a high-molecular-weight fraction raises extensional viscosity, dart impact resistance, and slow puncture resistance, while a low-molecular-weight fraction reduces die-lip shear stress and maintains output on single-screw blown-film lines. Target conversion processes include monolayer and coextruded blown film for heavy-duty sacks, carrier bags, agricultural film, lamination film, and general-purpose industrial packaging. In comparison with conventional unimodal C4 LLDPE grades of equivalent density and melt flow rate, LE8706 provides a wider stable bubble window and higher machine-direction tear resistance. In comparison with metallocene C6 or C8 LLDPE grades, LE8706 generally gives lower dart impact and lower transverse-direction tear but requires lower extruder pressure and tolerates greater frost line variation on conventional smooth-bore dies. The grade is not a plastomer; its butene comonomer content places it in the linear low-density polyethylene class rather than the very-low-density polyethylene class.
Published processing guidance for LE8706 places monolayer blown-film melt temperature between 190 °C and 210 °C. When the melt temperature falls below 180 °C on short single-screw extruders with L/D ratios under 25:1, the high-molecular-weight fraction may not fully homogenize, and films thinner than 30 µm can exhibit dispersed gel-like optical defects that originate from incomplete melting rather than resin degradation. When the melt temperature exceeds 230 °C, thermal-oxidative degradation of the butene branches can increase gel formation at the die lip, and the slip/antiblock additive package may migrate to the die exit and create deposit-related bubble instability. On production-scale blown-film lines equipped with grooved-barrier extruders of 60 mm to 90 mm screw diameter and 30:1 L/D, a die gap of 1.0 mm to 1.6 mm is commonly selected. The blow-up ratio should be maintained between 2.0:1 and 3.0:1, and the frost line height should be set between 1.5 and 2.5 die diameters to prevent excessive orientation or low melt strength collapse. In a 200 mm die line operating at 180 kg/h to 250 kg/h, bubble stability is controlled by balancing internal bubble pressure with haul-off speed to maintain film gauge variation within ± 5%. Melt pressure before the screen pack on a 90 mm grooved-barrier extruder is typically maintained below 350 bar; higher pressures indicate insufficient melting or an excessively fine screen pack and can promote shear-induced gels. Pre-drying is not normally required at ambient relative humidity below 60%; however, surface moisture on pellets stored in unheated silos at high humidity can introduce bubble defects, and a hopper dryer set at 60 °C to 70 °C for 1 h to 2 h is used where condensation is observed. In cast-film conversion the bimodal high-molecular-weight fraction increases melt curtain tension and may reduce drawdown at high line speeds. Published application data for LE8706 in cast configurations is limited; when it is used, melt temperatures should be kept near 210 °C to 220 °C, and chill roll temperatures between 15 °C and 25 °C. Die-lip deposit formation can be controlled with fluoropolymer processing aid if shear stress at the die lip exceeds the critical value for additive bloom.
At a nominal film thickness of 40 µm and a blow-up ratio of 2.5:1, selected typical values from Borouge technical literature indicate that LE8706 film exhibits a tensile stress at break of approximately 35 MPa in the machine direction and 32 MPa in the transverse direction when tested according to ISO 527-3. Elongation at break is approximately 650% in the machine direction and 750% in the transverse direction. Dart impact resistance measured by ISO 7765-1 method A falls in the range of 100 g to 120 g for the same film. Elmendorf tear resistance measured according to ISO 6383-2 is approximately 40 kN/m in the machine direction and 45 kN/m in the transverse direction. Haze measured by ASTM D1003 is typically 12% to 14%, and 60° gloss measured by ASTM D2457 is in the range of 55 to 60 gloss units. These values are typical data from converter sampling, not specification limits, and they shift with die gap, blow-up ratio, frost line height, and film thickness. The bimodal molecular weight distribution increases machine-direction tear resistance relative to conventional unimodal C4 LLDPE at equal density because the high-molecular-weight tail raises the energy required for oriented fibril fracture. At the same time, transverse-direction tear remains a limiting property for heavy-duty sack applications requiring values above 60 kN/m; in such cases, LE8706 is typically coextruded with an HDPE or metallocene C6 skin rather than used as a monolayer below 30 µm. Slow puncture resistance measured by ASTM D5748 on 100 µm film is generally between 60 N and 80 N, although published data for this specific configuration is limited and converter validation is required. The coefficient of friction after 24 h maturation measured by ISO 8295 is typically below 0.2, depending on slip additive migration to the film surface.
Agricultural film applications for LE8706 are typically limited to mulch films and silage clamp films where the converter compounds a UV stabilizer masterbatch into the resin at 5% to 12% letdown. The base grade contains no hindered amine light stabilizer or UV absorber beyond the processing antioxidant; unprotected film exposed to continuous outdoor sunlight can lose mechanical integrity within 3 to 6 months depending on film thickness and solar radiation dose. For greenhouse films with a service life of 12 to 24 months, a coextruded HALS package is required. In lamination film, LE8706 at 20 µm to 40 µm is used as a sealant or print web on solventless or solvent-based adhesive laminators. The slip package reduces blocking after winding, but the film must be corona treated to 38 mN/m to 42 mN/m dynamic wetting tension measured by ISO 8296 before printing or lamination; re-treatment may be required after 24 h because additive bloom can lower surface energy. Published data for specific adhesive bond strengths with LE8706 is limited; converters must validate adhesive compatibility because slip agent migration can influence wetting and bond strength in solventless lamination.
In carrier bag and T-shirt bag conversion, replacement of a conventional unimodal C4 LLDPE with LE8706 commonly permits down-gauging because the high-molecular-weight fraction preserves seal-puncture resistance after the bag is punched and side-sealed. In converter-reported comparisons on a 120 mm grooved-barrier blown-film line with 300 mm die diameter and 1.2 mm die gap, output differences of 5% to 10% have been observed relative to a unimodal C4 grade of the same 1.0 g/10 min melt flow rate, provided the compression-zone barrel temperatures are raised by 5 °C to 10 °C. However, published data for this specific configuration is limited, and the output gain depends on screw design, die pressure, and the selected film gauge. The seal initiation temperature is usually characterized by ASTM F88 seal strength testing, but the absolute seal strength is a function of seal-bar dwell time, pressure, and film gauge; converter validation is therefore required. Compared with a metallocene-catalyzed C6 LLDPE of equivalent density, LE8706 typically shows lower dart impact at 25 µm but requires lower extruder pressure and exhibits fewer melt-fracture-related bubble instabilities on smooth-bore dies. The narrower molecular weight distribution of the metallocene grade increases shear stress at the die lip and can reduce output on older extruders with L/D ratios below 25:1.
| Parameter | Borouge Borstar LLDPE LE8706 | Conventional unimodal C4 LLDPE | Metallocene C6 LLDPE |
|---|---|---|---|
| Density (ISO 1183-1) | 0.918 g/cm³ | 0.918 g/cm³ | 0.918 g/cm³ |
| MFR (190 °C, 2.16 kg, ISO 1133-1) | 1.0 g/10 min | 1.0 g/10 min | 1.0 g/10 min |
| Comonomer | butene | butene | hexene |
| Molecular architecture | bimodal | unimodal | narrow unimodal |
| Dart impact at 40 µm (ISO 7765-1) | 100–120 g | 70–90 g | 150–180 g |
| Elmendorf tear MD/TD (ISO 6383-2) | 40/45 kN/m | 30/35 kN/m | 50/60 kN/m |
| Bubble stability on 200 mm die | wide | moderate | shear-sensitive |
| Die-lip shear stress at equal output | lower | moderate | higher |
At the die lip, the bimodal distribution of LE8706 lowers the shear stress at a given throughput compared with an equivalent melt flow rate metallocene C6 grade, which reduces the onset of sharkskin and cyclic melt fracture on smooth-bore dies. This effect is most pronounced at high film line speeds above 80 m/min. The benefit is operationally relevant for converters running narrow die gaps of 0.8 mm to 1.2 mm, where die land residence time and shear rate are high. At the same time, the butene branch length in LE8706 provides less tie-molecule network than a hexene comonomer under equivalent density and molecular weight conditions. This explains the lower dart impact and transverse-direction tear compared with metallocene C6 grades and supports the use of LE8706 in coextruded structures where a C6 or C8 skin supplies ultimate impact resistance. The comparison is based on typical converter-reported data and manufacturer technical literature for general-purpose film grades at equivalent density and melt flow rate. It does not represent a formal specification. Additive packages, pellet shape, and catalyst residues differ among suppliers and influence the observed gel count, color, and organoleptic properties.
LE8706 is manufactured with an additive package that supports food-contact use when the finished article complies with the applicable migration limits. Borouge technical documentation indicates conformity with European Union Commission Regulation (EU) No 10/2011 as amended, including the overall migration limit of 10 mg/dm² for plastic materials in contact with food. The polyethylene base polymer also falls within the scope of U.S. FDA 21 CFR 177.1520 for olefin polymers used in contact with food, subject to end-use limitations for the specific food type and temperature. These clearances apply to the unmodified resin and standard additives; downstream additions of masterbatches, printing inks, adhesives, or recycled content require separate assessment. For fatty food simulants and repeated-use articles, migration testing under EN 1186 and EN 13130 may be required. LE8706 is not intended for medical implant applications or for continuous contact with oxidizing acids above 40 °C. The grade must also be assessed under REACH Regulation (EC) No 1907/2006, particularly Article 33 communication obligations if the converter introduces substances of very high concern through masterbatches or processing aids. RoHS Directive 2011/65/EU compliance for electrical and electronic equipment should be verified by the end user for the finished article rather than assumed from the resin alone.
