| HS Code | 187180 |
| Density | 0.918 g/cm³ |
| Melt Flow Index | 2.0 g/10 min (190°C / 2.16 kg) |
| Melting Point | 122 °C |
| Vicat Softening Point | 102 °C |
| Tensile Strength At Break Md | 45 MPa |
| Tensile Strength At Break Td | 40 MPa |
| Elongation At Break Md | 600 % |
| Elongation At Break Td | 700 % |
| Tear Strength Md | 80 N/mm |
| Tear Strength Td | 100 N/mm |
| Dart Drop Impact F50 | 180 g |
| Haze | 8 % |
As an accredited SK LLDPE FT811 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SK LLDPE FT811 is supplied in 25 kg polyethylene-lined bags, palletized and stretch-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | SK LLDPE FT811: one 20′ FCL, packed in 25 kg bags on pallets, about 25 metric tons per container. |
| Shipping | SK LLDPE FT811 is a non-hazardous linear low-density polyethylene resin supplied as free-flowing pellets. Ship as general cargo in sealed bags or hopper containers. Protect from moisture, heat, and direct sunlight during transit and storage. Not subject to dangerous goods regulations. |
| Storage | Store SK LLDPE FT811 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed to prevent moisture contamination and dust accumulation. Avoid contact with strong oxidizers. Maintain good housekeeping to minimize static buildup, and follow standard resin storage guidelines for safe handling. |
| Shelf Life | Shelf life is 12 months from manufacture date when stored in original packaging in a cool, dry place. |
On high-output single-layer blown film lines equipped with internal bubble cooling and reversing haul-offs, stabilising the neck height of SK LLDPE FT811 against the lower melt tension typical of linear resins requires either a lower frost line setting or the addition of 10–20 wt% of a branched LDPE with a melt index of 0.25–0.5 g/10 min per ASTM D1238. In high-clarity produce bags the resin is processed neat through a 45–75 mm grooved-feed extruder with a 30:1 L/D barrier screw, die gap of 1.8–2.4 mm, blow-up ratio from 2.0:1 to 3.0:1, and melt temperature between 185°C and 215°C; the frost line is positioned 350–700 mm above the die to maintain gauge variation within ±5% on layflats from 250 mm to 1,200 mm. For food-contact films, the finished structure is assessed under EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² and specific migration testing in the relevant food simulants, while the resin falls under FDA 21 CFR 177.1520 for olefin polymers when used in direct food contact. Film mechanical acceptance is normally recorded against ASTM D882-18 tensile and ASTM D1709-16a dart drop, with the latter often used as a converter quality index. Antiblock and slip masterbatches are metered at 0.5–1.5 wt% and 0.5–1.2 wt% respectively when the target kinetic coefficient of friction is below 0.25. The film is converted into bread bags, perforated fresh produce bags, side-seal freezer bags, and lightweight carrier bags for bakery and cooled food distribution.
| Compliance parameter | Standard | Test condition |
|---|---|---|
| Overall migration in food simulants | EU 10/2011 | 10 mg/dm² limit |
| Olefin polymer food-contact resin | FDA 21 CFR 177.1520 | Conditions A–H; food types I–X |
| Tensile properties | ASTM D882-18 | 500 mm/min crosshead speed |
| Dart impact resistance | ASTM D1709-16a | Method A/B; 38 mm dart |
Cast stretch film lines running FT811 for machine pallet wrap are constrained by the balance between pre-stretch ratio, cling force after ageing, and puncture resistance on irregular pallet loads. The resin is dry-blended into the core layer at 90–98 wt% with a cling concentrate metered into the skin layers at 2.0–5.0 wt%; typical cling concentrates contain polyisobutylene or VLDPE and are formulated to produce a peel cling value of 50–150 g after 24 h ageing under ASTM D5458. Film thickness is set between 12 µm and 30 µm on a 3-layer or 5-layer cast coextrusion line with a 0.6–1.0 mm die gap, 400–700 m/min line speed, and a polished chill roll held at 18–25°C. Pre-stretch units on the pallet wrapper are operated at 200–300% elongation; above this range the low molecular weight tackifier in the cling layer can migrate into the core and reduce puncture resistance measured under ASTM D5748. Published film-level data for FT811 in high-prestretch configurations above 250% is limited; converter trials should therefore verify retained load after 48 h on cornerboard-protected pallets before standardising.
A known production-scale failure mode on high-speed pallet wrap lines is edge fold-over originating from gauge bands at die lip build-up; when edge thickness exceeds the web average by more than 10%, the film web oscillates between the primary and secondary stretch rollers and produces telescoping rolls. This is managed by controlling die lip exit temperature to within ±3°C and by maintaining a 0.6–1.0 mm die gap without excessive draw ratio. The relevant EU packaging logistics obligations derive from 94/62/EC, but no direct food-contact migration standard applies unless the film is placed between the pallet and unpackaged food, in which case the converter must assess EU 1935/2004 documentation. Finished rolls include machine-roll pallet wrap in 500 mm widths, pre-stretched hand wrap, and anti-static stretch film used in electronics logistics.
In form-fill-seal conversion of granular fertilizer and polymer resin sacks, the primary processing restraint is the trade-off between gusseted sidewall stiffness and seal integrity at high packaging speeds. A three-layer coextruded tube based on FT811 is run through a die gap of 2.0–2.5 mm with a blow-up ratio of 2.0:1–2.6:1, collapsing frames fitted with 70–100 mm side gussets, and in-line corona at 38–42 mN/m. Outer skins are formulated with 12–20 wt% high-density polyethylene to raise modulus and reduce film elongation under the weight of a filled sack, while the core remains neat FT811 to preserve dart impact and flex-crack resistance. The inner skin is designed for hot-tack and seal through contamination, typically blending 10–15 wt% LDPE with FT811; the complete structure ranges from 120 µm to 180 µm depending on fill mass and transport mode.
| Layer | Component formulation | Thickness ratio | Primary function |
|---|---|---|---|
| Outer skin | 80–88 wt% FT811 + 12–20 wt% HDPE | 20–25% | modulus, printability, creep control |
| Core | 100 wt% FT811 | 50–60% | dart impact, flex-crack resistance |
| Inner skin | 85–90 wt% FT811 + 10–15 wt% LDPE | 20–25% | seal strength, dust contamination tolerance |
Industrial sack compliance does not require direct food-contact migration data, but converters exporting to the EU maintain REACH Article 33 SVHC documentation at the 0.1 wt% threshold and record drop resistance under ISO 7965-1 for filled sack masses up to 25 kg. Downstream conversion on FFS equipment uses impulse sealing jaws held at 150–170°C with seal bar dwell times of 0.8–1.5 s; gauge non-uniformity above ±7% at the gusset crease is a known source of side-seal leakage and must be controlled through collapsed bubble geometry. The resulting sacks serve as heavy-duty shipping sacks for polymer resins, fertilizer sacks for export markets, and compacted chemical powder sacks where the sack wall must withstand internal pressure from entrained air.
Agricultural bale wrap based on FT811 is processed on cast coextrusion lines with three or five layers at a total thickness of 25–30 µm; the cling layer is metered with a tackifier concentrate at 3–6 wt%, while the outer layers contain a HALS-based UV masterbatch at 0.3–0.6 wt% and either titanium dioxide at 2.0–4.0 wt% for white films or carbon black at 2.0–2.5 wt% for black films. Field wrappers apply 60–80% stretch, which re-orients the polyethylene chains and changes oxygen transmission; the film is therefore tested under ISO 15105-2 after laboratory pre-stretching rather than in the unstretched state. Compliance with EN 13206 establishes the minimum requirements for silage bale wrapping film, including tensile properties, tear resistance, and UV ageing after artificial exposure. Process control centres on chill roll temperature of 18–28°C, die gap of 0.6–0.8 mm, and line speeds from 250 m/min to 450 m/min; excessively fast quenching produces a low-crystallinity outer skin that can exude tackifier and cause roll blocking during transport. Finished constructions are used as round bale wrap for grass and maize silage, clamp side sheets, and silo bag inserts where oxygen exclusion over a 12-month storage period is essential.
Extrusion coating trials with FT811 on 300–400 g/m² paperboard are run at melt temperatures between 285°C and 315°C, with a 90 mm extruder using a 30:1 L/D screw, a 0.5–0.8 mm flat die, and an air gap of 150–250 mm. The linear rheology of FT811 produces higher neck-in and lower draw-down stability than equivalent branched LDPE, so line speed is typically limited to 150–300 m/min unless the formulation is modified with 10–25 wt% LDPE. Coating weight is set from 15 g/m² to 30 g/m²; adhesion to board is secured by ozone treatment of the melt curtain and pre-corona of the substrate to 40–44 mN/m, with peel force recorded on a tensile tester after conditioning. For food contact, the coated board is assessed under FDA 21 CFR 176.170 for paper and paperboard components and EU Regulation (EU) No 10/2011 with migration testing in 10% ethanol and 95% ethanol simulants. At extrusion coating temperatures above 315°C, the phenolic antioxidant package may undergo partial degradation; converters therefore monitor oxidative induction time under ISO 11357-6 and hold melt residence time below 10 min. Published data for FT811 in this specific coating configuration is limited; converter-run adhesion and organoleptic testing should therefore replace any assumption based on conventional LDPE coating grades. The coated board enters converting lines for gable-top carton inner liners, paperboard cups and tubs for chilled dairy, and industrial paper sacks requiring a moisture barrier.
At chill roll temperatures below 25°C, the coefficient of friction of a cast film surface governs bag track alignment on vertical form-fill-seal jaw feed systems running frozen vegetables or IQF poultry. FT811 is coextruded in a three-layer A/B/C structure with a die gap of 0.6–1.0 mm, a 18–25°C polished chill roll, and line speeds of 250–500 m/min; the sealant layer blends 10–20 wt% of a plastomer or metallocene LLDPE with FT811 to lower seal initiation temperature by 5–10°C and improve hot-tack during the short jaw dwell at 110–135°C. The external skin carries a slip masterbatch at 1.0–2.0 wt% and an antiblock masterbatch at 0.5–1.0 wt%; kinetic coefficient of friction is tested under ASTM D1894 after 72 h of slip migration and is held between 0.10 and 0.20 to prevent bag misalignment or product spillage. Compliance for frozen food packaging is established under FDA 21 CFR 177.1520 and EU Regulation (EU) No 10/2011, and converters record seal strength under ASTM F88/F88M at 200 mm/min jaw separation. Total erucamide content above 0.25 wt% in the outside layer is avoided because migration to the sealant layer can reduce seal strength after 30 days of bag inventory. Downstream pouches include pillow packs for frozen vegetables, flat-bottom bags for IQF seafood, and ice cream pouches requiring low-temperature puncture resistance.
Competitive SK LLDPE FT811 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
We will respond to you as soon as possible.
Tel: +8615365186327
Email: admin@ascent-chem.com
Flexible payment, competitive price, premium service - Inquire now!
SK LLDPE FT811 is a film-grade linear low-density polyethylene produced by low-pressure gas-phase copolymerization of ethylene and an α-olefin comonomer. The resin is intended for blown film extrusion in monolayer and coextruded structures. Its nominal melt flow rate is 1.0 g/10 min when measured at 190 °C/2.16 kg according to ASTM D1238 or ISO 1133-1:2022. Nominal density is 0.919 g/cm³ according to ASTM D1505 or ISO 1183-1:2019. These values are typical; the lot-specific certificate of analysis governs incoming acceptance. The product is positioned in the general-purpose heavy-duty film segment, where controlled downgauging and low-temperature impact resistance drive material selection.
At the molecular level, the resin has a linear backbone with short-chain branches introduced by the comonomer. Unlike high-pressure LDPE, it carries a different branching architecture, which influences extensional flow and load transfer. The practical consequence is higher tensile and puncture resistance than LDPE of equivalent melt flow rate, but lower melt strength during tubular film extrusion. Equipment configuration must therefore account for a narrower bubble stability window, particularly when the resin is run at high blow-up ratios.
Compared with high-pressure LDPE of similar melt flow rate, FT811 typically requires higher extruder torque and yields higher dart impact and tensile strength at matched gauge. The linear architecture transmits stress more effectively through tie chains and trapped entanglements, while the reduction in long-chain branching lowers shear sensitivity. In production, this shifts the extruder’s pressure-versus-output relationship upward and makes screw design more critical. Barrier screws with mixing pins or Maddock mixers, L/D ratios from 24 to 30, and internal bubble cooling are the usual hardware responses.
Compared with single-site catalyzed LLDPE grades of similar density, FT811 may show a broader interchain comonomer distribution. That can improve certain tear properties but may raise seal initiation temperature and haze. When films require seal initiation below 90 °C or haze below 5%, a metallocene grade should be selected or included as a coextruded seal layer. Published data for this specific configuration is limited; direct film trials on the intended extrusion line are required for ranking.
The following table lists primary specification values used for incoming resin qualification. Film-dependent tensile, tear, dart impact, and haze values are not single-point constants; they vary with gauge, blow-up ratio, frost line height, and cooling rate.
| Parameter | Method | Typical value |
|---|---|---|
| Melt flow rate | ASTM D1238 / ISO 1133-1:2022 | 1.0 g/10 min at 190 °C/2.16 kg |
| Density | ASTM D1505 / ISO 1183-1:2019 | 0.919 g/cm³ at 23 °C |
| Melting peak temperature | ISO 11357-3 | 122–124 °C |
| Vicat softening temperature | ASTM D1525 / ISO 306 | 105 °C |
The thermal and rheological baseline supplied by these values places FT811 in the semicrystalline LLDPE range. A density of 0.919 g/cm³ corresponds to a crystal weight fraction of approximately 35–40%, which reduces stiffness while increasing dart impact and tear propagation resistance relative to higher-density grades. The melting peak at 122–124 °C and crystallization onset near 108 °C set practical boundaries for heat-seal operation and extrusion temperature management. Continuous film exposure above 60–70 °C under mechanical load is not recommended without creep evaluation.
Melt flow ratio measured as I21.6/I2.16 is a commonly reported lot-release parameter. For gas-phase LLDPE of this class, the ratio typically falls between 25 and 28. The value indicates moderate shear sensitivity, which is why screw speed changes produce smaller viscosity changes than in high-pressure LDPE. It also correlates with molecular weight distribution shape; a higher ratio usually increases melt strength and die pressure. Capillary rheometry according to ISO 11443 at 190 °C shows shear-thinning behavior with a power-law index commonly between 0.4 and 0.6 in the 100–1000 s−1 range. This controls die-gap selection: narrow gaps raise shear rate and reduce viscosity inside the die but can exceed the critical wall shear stress for melt fracture.
In direct comparison with an HDPE blown film grade of density 0.945 g/cm³, FT811 produces film with lower secant modulus and lower temperature resistance but superior dart impact and Elmendorf tear. The lower crystallinity reduces stiffness but also reduces the driving force for crack propagation. This positions FT811 for liners, heavy-duty sacks, and industrial packaging where puncture is the dominant failure mode, whereas HDPE is preferred for thin stiff bags and moisture-barrier applications. Compared with a butene-based LLDPE of identical density, the practical property difference can be small; if a hexene or octene comonomer is used, toughness and tear balance can shift, but the published data for this specific configuration is limited and direct testing is required.
On commercial monolayer blown film lines, die temperatures are set between 180 °C and 210 °C. For dies above 200 mm, melt-temperature uniformity across the circumference is more important than the average setpoint. The resin’s viscosity curve is relatively flat compared with high-pressure LDPE; increasing screw speed therefore does not reduce viscosity as sharply. Screw designs with barrier flights, Maddock mixers, or mixing pins are used to balance plastication and minimize gels. When die pressure approaches 350 bar, sharkskin melt fracture may appear at high output. The usual corrective sequence is to raise die lip temperature by 5–10 °C, widen the die gap to 1.5–2.5 mm, or reduce output.
Bubble stability is the limiting boundary in many heavy-duty film structures. A blow-up ratio of 2.0–3.0 and frost line height between 400 mm and 800 mm above the die are common starting points, but the optimum depends on die diameter, air ring design, and internal bubble cooling capacity. When higher melt strength is required, converters often blend 20–30 wt% high-pressure LDPE with FT811. Above 50 wt% LDPE, the mechanical property advantage shifts toward LDPE-like tear and optics, and the downgauging benefit can be lost. The blend-ratio boundary is non-linear: small additions of LDPE improve bubble stability without proportionally reducing dart impact.
The resin is non-hygroscopic under normal storage conditions, and pre-drying is generally not required. However, cold pellets exposed to humid air can carry surface condensation into the feed throat, producing bubbles or surface defects. Keep hopper and feed-throat humidity stable if pellets are stored below the dew point. Avoid melt temperatures above 230 °C for extended residence times. Purge with LDPE or a commercial purging compound when transitioning from high-molecular-weight HDPE or polar copolymers.
Additive selection influences film performance. Amide-based slip additives migrate to the surface over 24–72 h at ambient temperature; coefficient of friction measured according to ASTM D1894 typically decreases from above 0.6 to 0.2–0.3 after migration. Antiblock levels in the range of 500–1500 ppm silica reduce blocking, but excessive antiblock can increase haze and reduce seal integrity. Additive concentrates should be dispersed under high shear; poor dispersion creates gel-like optical defects and local slip variations.
For printing or lamination, film surface tension is usually raised to 38–42 mN/m by corona discharge. Surface tension decays over time, and additive bloom can lower the treated film’s dyne level. Immediate processing after treatment is therefore required to maintain adhesion. This is an operational boundary, not a resin defect. Print and lamination structures should be qualified with the intended corona output, line speed, and ink or adhesive system.
| Regulatory frame | Reference | Application note |
|---|---|---|
| United States food contact | 21 CFR 177.1520 | Olefin polymers; suitability depends on end-use conditions and article construction. |
| European Union food contact | Regulation (EU) 10/2011 | Overall migration and specific migration limits must be tested on the final film or component. |
| REACH | Regulation (EC) 1907/2006 | Substance and SVHC communication obligations apply to the supply chain. |
| RoHS | Directive 2011/65/EU | Applies to finished electrical/electronic equipment; bulk resin is outside direct scope. |
In heavy-duty shipping sacks, the selection of FT811 is usually driven by a combination of tear propagation resistance and puncture strength. At gauge targets from 55 µm to 70 µm, the resin can be used as a blending partner with LDPE or as the primary LLDPE component in a coextruded structure. Heat seal performance should be measured according to ASTM F88 or ASTM F2029; hot-tack performance is not directly specified by the resin datasheet and must be verified on the packaging line because it depends on seal bar temperature, pressure, and dwell time.
For frozen food packaging and industrial liners, low-temperature impact resistance is a key criterion. LLDPE film derived from FT811 maintains toughness below −20 °C in non-notched applications, but the exact threshold depends on gauge and stress concentrators. Users should verify the final film using ASTM D1709 dart impact and ASTM D1922 tear methods rather than extrapolating from resin melt flow rate or density. In chemical packaging, environmental stress cracking resistance can be evaluated using ASTM D1693 bent-strip specimens cut from film, although the method is originally designed for molded plaques.
When downgauging a heavy-duty sack from 70 µm to 55 µm, the required dart impact increase often drives substitution of LDPE-rich blends with LLDPE-rich blends containing FT811. In such constructions, the limiting factor is frequently bubble stability rather than film properties. If the film is coextruded, placing the LLDPE-rich layer in the core or the outer layer can improve toughness while a thin LDPE-rich layer preserves heat-seal response. Published data for this specific configuration is limited; production-scale trials remain necessary to confirm the layer distribution and output ceiling.
