| HS Code | 380501 |
| Density 23 C | 935 kg/m³ |
| Melt Flow Rate 190 C 2 16 Kg | 0.30 g/10min |
| Melting Point Dsc | 126 °C |
| Vicat Softening Temperature | 120 °C |
| Tensile Strength At Yield Md | 20 MPa |
| Tensile Strength At Break Md | 35 MPa |
| Elongation At Break Md | 800% |
| Elongation At Break Td | 900% |
| Elmendorf Tear Strength Md | 8 N |
| Elmendorf Tear Strength Td | 16 N |
| Dart Drop Impact F50 | 150 g |
| Film Haze | 10% |
As an accredited Borouge Borstar LLDPE FB1350 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Borouge Borstar LLDPE FB1350 supplied in 25 kg polyethylene bags, palletized and wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of Borouge Borstar LLDPE FB1350, ensuring secure, stable packing and proper labeling for safe transport. |
| Shipping | Borouge Borstar LLDPE FB1350 is a non-hazardous polyethylene resin shipped as pellets in moisture-protective bags, octabins, or bulk containers. Avoid exposure to rain, dust, and direct prolonged sunlight. Store dry, keep below 50°C, and handle gently to prevent bag damage and contamination during transport. |
| Storage | Store Borouge Borstar LLDPE FB1350 in a dry, clean, well-ventilated area away from direct sunlight, heat sources, and ignition sources. Keep in its original sealed packaging or silos designed for polyethylene pellets. Avoid exposure to moisture, dust, and contaminants. Maintain moderate ambient temperatures and protect from mechanical damage to preserve product quality. |
| Shelf Life | Shelf life is typically indefinite when stored in dry, cool conditions, away from direct sunlight and contaminants. |
On blown film lines configured with grooved feed sections, barrier screws of 30:1 L/D, and spiral mandrel dies from 200 mm to 350 mm diameter, Borouge Borstar LLDPE FB1350 is processed for heavy-duty shipping sacks at a nominal melt temperature of 195 °C to 220 °C. The resin is a butene-based linear low density polyethylene with a nominal density of 918 kg/m³ determined under ISO 1183-2 and a melt mass-flow rate of 1.0 g/10 min determined under ISO 1133-1:2022 at 190 °C/2.16 kg. The bimodal molecular mass distribution permits die gaps of 1.8 mm to 2.5 mm with blow-up ratios from 2.2:1 to 3.0:1 without melt fracture at linear web speeds up to 40 m/min on 65 mm extruders. Converters dry-blend FB1350 with autoclave LDPE having a melt index of 2.0 g/10 min in ratios from 70:30 to 85:15; the lower LDPE content preserves dart impact, while the higher LDPE content raises bubble stability in 120–160 µm films. Field production data from sack lines show that regrind levels above 20 wt% reduce dart impact dispersion, and melt pressure fluctuations exceeding ±8 bar at the die indicate inadequate mixing or feed zone temperature imbalance. Heavy-duty shipping sacks produced at 100–150 µm are tested for drop resistance under ISO 7965 and for tear propagation under ISO 6383-2. The finished articles, typically 25 kg resin or fertiliser sacks, require side gusseting and a minimum seal strength of 12 N/15 mm measured under ASTM F88/F88M at 140 °C seal bar temperature and 0.5 MPa pressure for 1 s dwell. Process limits include bubble instability if ambient hall circulation exceeds 1.0 m/s and sharkskin if the die gap falls below 1.6 mm at screw speeds above 90 rpm.
| Test | Standard | Condition | Acceptance for 100 µm film |
|---|---|---|---|
| Dart impact | ASTM D1709-16 Method A | 38.1 mm dart, phenolic | ≥ 800 g |
| Elmendorf tear | ISO 6383-2 | MD and TD | 4–10 N, MD/TD ratio < 1.5 |
| Tensile break | ISO 527-3 | 500 mm/min | MD 25–35 MPa; TD 20–30 MPa |
For packaging of individually quick-frozen vegetables and processed protein at storage temperatures around -25 °C, FB1350 is generally limited to 40–70 µm blown films unless it is blended with 20–40 wt% of an ultra-low density ethylene copolymer. The butene comonomer content does not reduce the brittle temperature to the same degree as octene-based grades; field data from frozen food packaging lines indicate that monolayer FB1350 at 50 µm may pass room-temperature dart impact under ASTM D1709-16 Method A but may drop below 300 g when conditioned at -20 °C. Published data for this specific product at frozen distribution temperatures is limited, so converters raise puncture resistance and lower the seal initiation temperature by blending with ULDPE or EVA at 15–30 wt%. The compounding step is avoided; dry blending at the hopper is sufficient for non-barrier frozen vegetable packs. On a 55 mm blown film line with a 2.0 mm die gap, 2.8:1 BUR, and barrel profile from 180 °C at the feed throat to 205 °C at the die, the blend is run at a frost line height of 250–350 mm above the die. Monolayer FB1350 seal initiation is commonly observed at 95–105 °C on a hot-tack tester under ASTM F1921; blends containing EVA shift seal initiation downward by 5–10 °C. Compliance with food contact is assessed under FDA 21 CFR 177.1520 and EU Regulation (EU) No 10/2011, with migration testing per OM2 conditions at 100 °C/2 h in aqueous and fatty simulants. The finished IQF pillow packs are run at 60–80 packs/min on vertical form-fill-seal machines; the limiting failure mode is seal contamination by frozen vegetable dust, not film mechanical strength.
Agricultural film converters evaluating FB1350 for 150–200 µm greenhouse cladding and low-tunnel covers use a UV masterbatch based on hindered amine light stabilisers at 4,000–8,000 ppm plus 500–1,200 ppm of a phenolic antioxidant. The carrier resin of the masterbatch is matched to the base resin to avoid sacrifice of tear propagation resistance; an EVA or metallocene carrier at 10 wt% loading can reduce light transmission measured under ISO 13468-2 by more than 3%, which triggers a light-transmission audit before the film is released for horticulture use. In UV-stabilised film lines, FB1350 is run with a die gap of 2.0–2.5 mm, BUR 2.5:1, and a melt profile from 180 °C at the feed zone to 210 °C at the die, with internal bubble cooling maintaining the frost line at 300–400 mm above the die. Contact with sulfur-containing agrochemicals and halide-based soil fumigants accelerates oxidative degradation at the film surface, so greenhouse operators are advised to wash films after pesticide spraying. Tensile properties after 24 months of outdoor exposure are assessed under ISO 527-3, while light transmission and haze are measured under ASTM D1003-21. The finished greenhouse covers are marked under EN 13206 where applicable, and the film is supplied in 8–16 m wide gusseted rolls for installation over steel hoops. Published data for FB1350 outdoor lifetime beyond 24 months in high-UV climates is limited.In coextruded barrier laminates for dry food pouches and bag-in-box inner liners, FB1350 is used as a sealant skin over a tie layer and EVOH core. Seal initiation typically occurs at 90–100 °C on a 5-layer blown film line with die temperatures of 205–215 °C. The sealant layer is maintained at 20–30% of total thickness, with the EVOH barrier at 10%, maleic anhydride grafted tie resin at 8–12%, and the structural core from FB1350 plus LDPE at 50–60%. Surface energy of the sealant side is fixed by corona treatment between 38 and 42 dyn/cm; below 36 dyn/cm, extrusion lamination bonds measured under ASTM F904 show a drop from 8 N/15 mm to below 4 N/15 mm when using standard solvent-based polyurethane adhesives. The sealant layer is not suitable for retort above 121 °C, because polyethylene seal strength falls below acceptable seal integrity on rapid decompression. Heat seal strength of the final laminate is measured under ASTM F88/F88M with 0.5 MPa pressure and 1 s dwell at 130 °C. Food contact compliance follows FDA 21 CFR 177.1520 and EU Regulation (EU) No 10/2011; laminates intended for high-fat dry foods require confirmation that the EVOH and tie resin components are also listed in the relevant annexes. The finished goods are dry food pouches, stand-up pouch sealant webs, and bag-in-box inner liners from 60–110 µm total laminate thickness.
Cast stretch wrap production at film thicknesses of 12–25 µm uses FB1350 mostly as a core layer rather than skin. On a 90 mm cast line with L/D 28:1, die width 2,000 mm, die gap 0.6–0.8 mm, air gap 100–120 mm, and chill-roll temperature set at 18–20 °C, FB1350 is blend-fed with an ultralow density ethylene-α-olefin copolymer at 60:40 to 70:30 weight ratios. The cling skin contains 1.5–3.0 wt% polyisobutylene or sorbitan monooleate cling additive; excess cling additive raises coefficient of friction beyond 0.8 and causes unwinding failure on stretch-wrapping machines. Pre-stretch ratios above 180% can produce local neck-in and film breakage with FB1350-rich formulations; field data from pallet-wrapping lines show stable operation at 150% pre-stretch at 24 µm with a 70:30 blend. Tensile properties are measured under ASTM D882, and machine direction elastic recovery is measured on a stretch film test rig at 23 °C and 50% RH. The final machine stretch wrap rolls are produced at 500–1,000 mm width and 1,500–3,000 m length; roll unwind tension is controlled below 0.4 N/mm of film width to prevent permanent set. Regulatory compliance for industrial stretch films is typically limited to REACH Regulation (EC) No 1907/2006 Article 33 communication and RoHS Directive 2011/65/EU; no specialty food-contact declarations are assigned to cast stretch stock.
Monolayer carrier bags, waste sacks, and disposable protective film using FB1350 are processed at 25–50 µm gauge with BUR 2.5:1 and die gaps 1.6–2.0 mm. In these thin-gauge applications, the limiting factors are draw resonance and bubble instability rather than mechanical strength. Batch-to-batch variation in melt mass-flow rate from 0.95 g/10 min to 1.05 g/10 min can alter melt pressure by approximately 8–15 bar on a 55 mm extruder, requiring screw speed adjustment. Moisture on pellet surfaces from outdoor silo storage at RH above 80% causes surface pitting; pre-drying at 60 °C for 2 h or heated conveying air is used before extrusion. The material is not suited for high-clarity retail display film because haze values under ASTM D1003-21 in 38 µm films generally remain above 8% without polishing additives. For waste sack applications, the finished product is tested under EN 13592 or ISO 527-3 depending on the customer specification; heavy-metal content in the packaging is controlled under EU Packaging and Packaging Waste Directive 94/62/EC, with total lead, cadmium, mercury and hexavalent chromium below 100 ppm. The end products are gusseted waste sacks, carrier bags with punched handle areas, and disposable aprons used in food processing lines where the high molecular orientation of blown film is retained.Competitive Borouge Borstar LLDPE FB1350 prices that fit your budget—flexible terms and customized quotes for every order.
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Borouge Borstar LLDPE FB1350 is a butene-comonomer linear low-density polyethylene produced in the Borstar cascaded slurry-loop/gas-phase polymerisation process. The product is classified under ISO 1872-1 as PE-LLD, 0.918, 0.35; base-resin density is 0.918 g/cm³ when measured according to ISO 1183-1, and melt flow rate is 0.35 g/10 min at 190 °C/2.16 kg according to ISO 1133-1:2022. The two-reactor Borstar sequence generates a bimodal molar mass distribution without post-reactor blending. A low-molar-mass fraction contributes to melt handling in the extruder, while a high-molar-mass fraction supports blown film bubble stability and mechanical resistance. The grade is supplied as virgin pellets with an antioxidant stabiliser package; slip and antiblock additives are not part of the base-grade designation unless specified in the purchase specification. Because published datasheet values are typical rather than specification minima, converters should use the shipment certificate of analysis for lot acceptance.
| Property | Test method | Unit | Published typical value |
|---|---|---|---|
| Density, base resin | ISO 1183-1 | g/cm³ | 0.918 |
| Melt flow rate | ISO 1133-1:2022 | g/10 min | 0.35 |
On single-screw blown-film extruders with grooved feed sections and L/D 30:1, melt pressure at constant screw speed is the primary indirect measure of process stability. Published processing data for FB1350 are limited to supplier recommendations; however, the low MFR of 0.35 g/10 min implies that melt temperature should be maintained between 190 °C and 230 °C at the die to balance screw torque and bubble melt strength. A die temperature below 180 °C may produce insufficient melt homogenisation and raise the risk of melt fracture on narrow die gaps. Die gaps from 1.2 mm to 2.0 mm are common for low-MFR LLDPE heavy-duty film; narrower gaps can reduce haze but increase shear stress at the die lip. For this grade, blow-up ratios from 2.0 to 3.5 are typically used, with frost line height adjusted to control film crystallinity and tear balance. Excessive frost line height reduces quench rate and may enlarge spherulitic structures, lowering dart impact resistance under ISO 7765-1. Internal bubble cooling is recommended only when the line has closed-loop air-flow control; otherwise bubble oscillation can appear at blow-up ratios above 3.0.
The Borstar bimodal architecture increases melt strength relative to unimodal butene LLDPE of equivalent MFR, but it does not eliminate the shear sensitivity of the linear backbone. Prolonged barrel residence above 250 °C can generate gel particles from thermal-oxidative degradation. Gel counts measured on optical film-inspection systems can increase at rates that depend on screw speed and backpressure. Converters operating high-output lines should monitor melt temperature at the die rather than barrel set-point temperature, because viscous heat generation in a low-MFR LLDPE can produce a melt-temperature offset of 5 °C to 15 °C above the barrel settings.
For heavy-duty sack and industrial liner applications, film performance is commonly assessed by Elmendorf tear in both directions according to ISO 6383-2, dart drop impact according to ISO 7765-1 or ASTM D1709, and tensile properties according to ISO 527-3. In butene-based LLDPE, machine-direction tear is consistently lower than transverse-direction tear because of orientation of the high-molecular-weight fraction during bubble expansion. The bimodal molar mass distribution of FB1350 can reduce this anisotropy relative to unimodal butene grades, but the direction-dependent difference remains measurable. Published values for FB1350 at a given thickness, blow-up ratio, and frost line height should be taken from the current Borouge datasheet because film properties are not intrinsic polymer constants; they are process-dependent.
Environmental stress crack resistance is relevant for liners and sacks holding aggressive or oxidising substances. ESCR testing under ASTM D1693 with 10% Igepal CO-630 at 50 °C is a standard comparative tool. The bimodal high-molar-mass tail typically extends time to failure relative to a unimodal LLDPE of equal density and MFR. Published FB1350-specific ESCR values are limited in public literature; therefore lot-specific ESCR should be requested when the packaging contains surfactants, alcohols, or oxygenated liquids. Unlike high-pressure low-density polyethylene, FB1350 has essentially linear chains with no long-chain branching. Consequently, extension thickening in transient elongational flow is lower than in LDPE. Converters often blend 10 wt% to 30 wt% LDPE into FB1350 to improve bubble stability and melt strength without sacrificing the ESCR contribution of the LLDPE phase on industrial bag-converting lines.
The principal difference between FB1350 and conventional unimodal butene LLDPE is the broadened molar mass distribution generated in the Borstar reactor sequence. The low MFR of 0.35 g/10 min would typically predict high melt viscosity and reduced throughput; the low-molar-mass fraction in the bimodal distribution compensates by lowering shear viscosity at extrusion shear rates. Consequently, at equal melt flow rate, FB1350 generally exhibits lower die pressure than a unimodal LLDPE of the same MFR when processed on a single-screw extruder with L/D 30:1. This process difference is most apparent at screw speeds above 80 min⁻¹, where shear heating and melt-pressure fluctuations in unimodal grades can force throughput reductions.
Compared with hexene- or octene-comonomer LLDPE, FB1350 contains shorter short-chain branches. At equal density, shorter comonomer chains reduce the probability of tie-molecule formation in the amorphous phase, which lowers puncture energy under high strain rate. The penalty is measurable as lower dart drop impact under ASTM D1709 and lower instrumented puncture energy under ISO 6603-2 compared with metallocene-catalysed octene grades at equivalent film thickness. FB1350 is therefore not a direct replacement for octene-based mLLDPE in stretch-film or high-abuse packaging; its technical position is heavy-duty film in which melt strength, ESCR, and mechanical performance are controlled by architecture rather than comonomer length alone.
| Characteristic | FB1350 | Unimodal butene LLDPE | Metallocene octene LLDPE | Test or process condition |
|---|---|---|---|---|
| Molar mass distribution | bimodal | unimodal | narrow unimodal | ISO 16014-4 GPC |
| Comonomer | butene | butene | octene | FTIR/NMR |
| Bubble stability at BUR 2.5–3.5 | higher | reference | variable; may require higher melt strength | blown-film line, 45 mm grooved-feed extruder |
| Dart impact at equal thickness | higher than unimodal butene | reference | higher than FB1350 | ISO 7765-1 |
| ESCR in 10% Igepal | improved | reference | application-specific | ASTM D1693 |
In coextruded structures, the sealing layer is often a lower-melting polyethylene or plastomer. If FB1350 is used as the sealing layer, the seal initiation temperature is higher than that of octene-based plastomers because of the butene-comonomer architecture and the 0.918 g/cm³ density. Heat-seal performance should be measured according to ASTM F88 for seal strength, ASTM F2029 for heat sealability, and ASTM F1921 for hot-tack. The practical sealing window is typically defined by the temperature interval over which seal strength exceeds a threshold such as 4.0 N/15 mm. Published FB1350-specific sealing curves are limited, so converter trials on the target heat-seal device are required. The grade can be used as a core or sublayer in heavy-duty sacks, where the sealing layer is a lower-density PE. This arrangement avoids exposing FB1350 to the sealing jaw surface and preserves layer stiffness.
Film optics and coefficient of friction also depend on additive package and processing. Without slip or antiblock additives, the coefficient of friction of FB1350 film may exceed 0.6 under ISO 8295, which can restrict machinability on form-fill-seal and bag-converting equipment. A starting point for additive incorporation is therefore required when high-speed converting lines are used. Haze measured according to ISO 14782 is not an intrinsic resin property; it depends on die gap, blow-up ratio, and cooling rate. The same resin can produce lower haze on internal-bubble-cooling lines with quench rates above 10 °C/s than on conventional lines with lower frost-line cooling capacity.
For food-contact applications, converters are responsible for confirming that the final film meets Commission Regulation (EU) No 10/2011 and FDA 21 CFR 177.1520 for olefin polymers. The grade is based on ethylene polymer chemistry and falls outside the scope of RoHS Directive 2011/65/EU restrictions on lead, mercury, cadmium, hexavalent chromium, PBB, and PBDE. REACH registration is maintained by the supplier. No predrying is required under normal storage conditions because polyethylene is not hygroscopic. If pellets are stored below 10 °C and moved into a warmer production area, surface condensation should be prevented by allowing the sealed packaging to equilibrate for 24 h before opening. The low MFR of 0.35 g/10 min makes the material unsuitable for injection moulding applications requiring thin-wall flow; spiral flow data for this specific grade are not published.
