| HS Code | 788633 |
| Product | SK LLDPE FT810 |
| Resin Type | Linear Low Density Polyethylene (LLDPE) |
| Comonomer | Butene (C4) |
| Appearance | Pellets |
| Melt Flow Index 190 C 2 16 Kg | 2.0 g/10min |
| Density | 0.918 g/cm³ |
| Melting Point Dsc | 122°C |
| Vicat Softening Point | 96°C |
| Tensile Strength Yield | 12 MPa |
| Elongation At Break | 800% |
| Dart Drop Impact F50 | 150 g |
| Film Haze | 10% |
As an accredited SK LLDPE FT810 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 25 kg net polyethylene bags, palletized and stretch-wrapped for safe handling and efficient transport. |
| Container Loading (20′ FCL) | 20′ FCL container loaded with SK LLDPE FT810 resin, packed in 25kg bags on pallets, secured and stowed safely for export. |
| Shipping | SK LLDPE FT810 is shipped as non-hazardous linear low-density polyethylene resin pellets. It is packed in 25 kg bags, jumbo bags, or supplied in bulk containers. Transport should avoid dust, moisture, and excessive heat. Keep packaging intact, store dry, and handle with standard industrial equipment to preserve product quality. |
| Storage | Store SK LLDPE FT810 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep original sealed bags to prevent moisture pickup and contamination. Avoid excessive stacking that could damage packaging. Maintain good housekeeping to minimize dust accumulation. No special hazardous storage requirements apply under normal conditions. |
| Shelf Life | Store in original, unopened packaging under dry, cool conditions. Shelf life is 12 months from manufacture date. |
SK LLDPE FT810 is a butene-linear-low-density-polyethylene with the nominal resin values listed in the following table.
| Property | Test method | Nominal value |
|---|---|---|
| Melt index | ISO 1133-1 | 1.0 g/10 min (190 °C, 2.16 kg) |
| Density | ISO 1183-1 | 0.918 g/cm³ |
On a production blown-film line equipped with a 30:1 L/D grooved-feed single-screw extruder, a barrier screw with Maddock mixing elements, and a 250 mm die, the FT810 resin is run with adapter temperatures of 190–210 °C and die temperatures of 200–215 °C. The die gap is held at 1.8–2.5 mm for the target gauge range of 18–25 µm. Because the melt tension of butene-LLDPE is lower than that of high-pressure LDPE, 10–20 wt% LDPE is dry-blended into the hopper to stabilise the bubble and suppress bubble breathing at blow-up ratios above 2.0:1. The blow-up ratio is maintained at 2.0:1–2.8:1; frost line height is set at 5–8 die diameters to balance machine-direction and transverse-direction tear. Chilled air from the air ring is held at 8–15 °C to increase bubble stability without causing condensation on the die body. Slip/antiblock masterbatch is metered at 1–3 wt%, and a fluoroelastomer polymer processing aid is added at 0.02–0.05 wt% when the output rate approaches the melt fracture threshold. Film property release is checked against tensile testing per ISO 527-3, dart impact per ISO 7765-1, and Elmendorf tear per ISO 6383-2. Film that will be printed is corona-treated in-line to a minimum wetting tension of 38 mN/m and ink adhesion is verified per ISO 2409 before slitting. The resulting films are converted into carrier bags, produce bags, and light industrial liners. Food-contact applications require the formulation to comply with FDA 21 CFR 177.1520 for olefin polymers and with the overall migration and specific migration limits of EU Regulation 10/2011. The operational boundary appears when reclaimed edge trim above 20 wt% is used: if the flake has been stored at relative humidity above 60%, it is dried at 70 °C for 2 h before blending. Melt temperatures above 220 °C during shutdowns longer than 15 min increase gel formation in the die gap and trigger an unscheduled die-clean cycle.
Agricultural silage wrap and greenhouse film based on FT810 are formulated with a single-pellet additive concentrate that delivers a HALS-based UV package, anti-drip surfactant, and anti-fog surface-active agent in an ethylene-vinyl acetate carrier. The concentrate is added at 12 wt%; lines running 150 µm bale-wrap gauges may reduce the addition to 8 wt% to control die-lip plate-out over multi-day campaigns. The film is processed on heavy-duty blown-film lines with 25:1 to 30:1 L/D screws and a die gap of 2.0–2.8 mm. Melt temperatures are held at 190–210 °C. The blow-up ratio is set at 1.8:1–2.4:1, lower than that used for carrier bags, because silage wrap specifications favour machine-direction tensile and puncture resistance over isotropic tear balance. Frost line height is raised to 7–10 die diameters to develop orientation that improves impact resistance in machine-direction handling. Optical and wetting properties are verified by light transmittance per ISO 13468, haze per ISO 14782, and wetting tension per ISO 8296. Mechanical acceptance is based on EN 13206:2017 for agricultural covering films; bale-wrap products exported to the EU additionally require a REACH compliance statement under 1907/2006. Greenhouse films are checked for elongation retention after exposure using the artificial weathering method of ISO 4892-2. Terminal end products are silage bale wrap, greenhouse glazing, and mulch film. The process boundary is anti-drip agent plate-out on the die lips; converters mitigate this by reducing concentrate dose to 8 wt% on long runs and scheduling die-lip cleaning every 8–12 h. Reclaimed greenhouse film is not recommended above 30 wt% because UV degradation products in the reclaim reduce dart impact and act as gel nuclei in the bubble.
On blown-film lines producing 100–130 µm heavy-duty shipping sacks, FT810 is dry-blended with 20–30 wt% high-density polyethylene to raise modulus and creep resistance. The blend is processed at a melt temperature of 200–220 °C, a die gap of 2.2–2.8 mm, and a blow-up ratio of 1.8:1–2.2:1. The lower blow-up ratio is selected because the sack is cut and sealed in the machine direction, and the finished bag must pass the vertical drop test according to ISO 7965-2. The technical conflict on this equipment is that increasing HDPE raises film modulus but consumes dart impact and Elmendorf tear; converters therefore adjust the HDPE fraction inside the 20–30 wt% window to satisfy both drop-test certification and dart impact release testing per ISO 7765-1. The extruder is configured with a 30:1 L/D grooved-feed single-screw machine, a barrier screw, and a screen pack with mesh layering down to 80 µm to trap gel particles and unmelted HDPE skins before the die. Some converters use a gravimetric dosing system with loss-in-weight feeders to prevent blend segregation during long runs. The finished sacks are converted into FIBC liners, industrial packaging sacks, and compression-stacked bulk bags. For EU shipments, the converter verifies heavy-metal limits under the Packaging and Packaging Waste Directive 94/62/EC. The operational limitation is viscosity mismatch between FT810 and the HDPE modifier; below 200 °C melt temperature, visible melt streams can survive into the film, while above 220 °C reprocessed edge trim begins to show oxidative degradation. Published plant-scale data for this specific FT810/HDPE ratio in shipping sacks is limited; lot acceptance therefore requires a dart impact test on the finished bag before shipment.
Flat-die extrusion coating of FT810 at 15–25 g/m² onto paper, aluminium foil, or polyester film uses a processing envelope distinct from blown film. The grade is plasticised in a 26:1 L/D extrusion-coating line with a coat-hanger die and a short residence-time screw. Melt temperature at the die exit is held at 260–300 °C to promote adhesion through surface thermobonding to the substrate. The air gap from die exit to chill roll is maintained at 100–200 mm, and the chill roll is controlled at 10–15 °C. For aluminium foil structures, the aluminium web is preheated to 40–60 °C and the FT810 web is corona-treated in-line to a minimum wetting tension of 38 mN/m before winding. Peel adhesion to aluminium foil is measured per ASTM D1876 to detect dewetting at the interface. The sealant web is converted into flexible packaging for snack foods, coffee pouches, and aseptic carton inner layers. Seal strength is verified per ASTM F88 and hot tack per ASTM F2029; butene-LLDPE at 0.918 g/cm³ density provides a lower seal initiation temperature than high-pressure LDPE, allowing packagers to reduce heat-seal setpoints by 10–15 °C. Food-contact compliance is re-confirmed for the finished laminate under FDA 21 CFR 177.1520 and EU Regulation 10/2011. The main processing constraint is edge melt: because FT810 has lower melt tension than LDPE, coating weight uniformity can deteriorate at line speeds above 120 m/min unless the air gap is shortened to 100 mm or the die deckle is profiled.
Frozen-food packaging produced from FT810 is specified for ductile failure at storage temperatures where many packaging films become brittle. The film is blended with 10–20 wt% plastomer or metallocene-LLDPE to maintain dart impact after 24 h conditioning at −25 °C; the modifier shifts low-temperature dart drop upward while reducing film modulus by a controlled amount. The blend is run on conventional blown-film equipment at a melt temperature of 180–200 °C, a die gap of 1.8–2.5 mm, and a blow-up ratio of 2.0:1–2.5:1. The lower melt temperature minimises thermal-oxidative degradation of the plastomer phase during long runs. Target gauge is 50–80 µm, because thinner frozen-food bags fail at fold lines and seal interfaces. Slip/antiblock masterbatch is kept below 1 wt% in frozen-food film to avoid seal interference. Low-temperature performance is measured by a free-falling dart impact test under ISO 7765-1 after conditioning; the specification is usually written as no full-thickness break at −25 °C. Seal integrity is tested per ASTM F88 after the pouch has been frozen for 48 h. Food-contact compliance uses FDA 21 CFR 177.1520 for the frozen-food use, and EU-bound films are assessed under EU Regulation 10/2011 on the finished laminate. Terminal products are frozen vegetable bags, ice cube packaging, and frozen seafood film. The operational boundary is loss of bubble stability when plastomer addition exceeds 20 wt% on lines without chilled-air rings; frost line height must then be increased and line speed reduced to maintain bubble geometry.
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SK LLDPE FT810 is a linear low density polyethylene blown film grade supplied by SK Geo Centric Co., Ltd. The polymer is a 1-butene/ethylene copolymer manufactured through a Ziegler-Natta catalytic route, and it is designed for monolayer and coextruded film applications that require moderate melt strength, predictable bubble stability, and a balance between machine-direction and transverse-direction orientation. Published nominal density is 0.919 g/cm³ measured to ASTM D1505, with a typical certificate-of-analysis spread of ±0.002 g/cm³. Published nominal melt index is 1.0 g/10 min determined at 190 °C under 2.16 kg load per ASTM D1238 or ISO 1133-1:2022. These values place FT810 in the low-melt-index butene-copolymer segment, where shear-thinning behaviour and extensional viscosity are more responsive to screw speed and die land length than in high-melt-index cast-film grades.
The resin is hydrophobic, and polyolefins do not hydrolyse. Drying is therefore not normally required when pellets are stored in sealed silos or original packaging at temperatures below 30 °C. When relative humidity exceeds 70 %, surface condensation on cold pellets can cause feed-zone flooding, screw surging, and bubble gauge oscillation. Pellets from outdoor storage should be purged with dehumidified air at 30 °C for at least 4 h before release into the hopper. The additive package is normally a slip/antiblock formulation; exact additive loading should be confirmed because it alters film coefficient of friction to ASTM D1894 and blocking force to ASTM D3354.
On production-scale single-screw blown film lines, the recommended extruder configuration is a barrier screw with an L/D ratio of 24:1 to 30:1 and a Maddock or Egan mixing section at the screw tip. The mixing section disperses compositional heterogeneities introduced by the catalyst process and prevents melt-temperature stratification in the adapter. Barrel-to-die melt temperatures of 190 °C to 220 °C are appropriate as a starting window. The compression-zone barrel set point should be held below 215 °C on lines with long residence time distribution, because oxidative degradation accelerates rapidly above 230 °C.
Die-zone uniformity is more important than absolute melt temperature. Radial melt-temperature variation greater than 5 °C around the die circumference produces visible film gauge bands and can destabilise the frost line. The die gap should be set between 1.5 mm and 2.5 mm; narrow gaps below 1.2 mm raise head pressure and polymer melt fracture risk, while wide gaps above 3.0 mm reduce melt orientation and may increase haze. Blow-up ratios between 2.0:1 and 3.0:1 are used to balance tear properties. Frost line height of 6 to 10 die diameters is a practical starting point; lower frost line height increases cooling-rate orientation and reduces transverse-direction tear, while higher frost line height allows more stress relaxation and can improve impact.
Dual-lip air rings with chilled air at 5 °C to 15 °C increase external cooling and permit higher throughput. Internal bubble cooling can be used for high-output lines, but the internal air pressure must be balanced to avoid bubble breathing. The maximum melt temperature should not exceed 240 °C; at that temperature the oxidative induction time measured by ASTM D3895 decreases non-linearly, and gel particles may appear after short residence times. The practical issue on a 90 mm grooved-feed extruder is frequently torque limitation rather than melt fracture; a melt index of 1.0 g/10 min with broad molecular weight distribution transmits more viscous dissipation into the melt than a 2.0 g/10 min metallocene LLDPE at identical screw speed.
Output limitations are determined less by melt viscosity alone than by cooling capacity, screw recovery, and pellet feed stability. In field practice, a 1.0 g/10 min butene-copolymer LLDPE may impose higher extruder motor load and lower melt pumping than a metallocene hexene LLDPE of identical density. Batch-to-batch variation in pellet bulk density greater than 2 % affects gravimetric feed accuracy; a gravimetric blender or hopper loader is recommended for tight film-thickness control when the film is converted to 50 µm gauge specification.
Film gauge measurement should be performed with an in-line capacitive or beta gauge at the collapsing frame. Variations in haze and dart impact become more pronounced below 25 µm because orientation and cooling gradients dominate the crystalline morphology. For specification development, test film should be conditioned at 23 °C and 50 % RH for at least 40 h according to ASTM D618 before mechanical testing.
The selection of FT810 over alternative LLDPE film grades is based on comonomer length, catalyst architecture, and final package abuse conditions. In blown film testing to ASTM D1709 method A, a butene-copolymer LLDPE with density 0.918–0.920 g/cm³ typically exhibits lower dart impact than a 1-hexene or 1-octene copolymer of the same nominal density and melt index. In Elmendorf tear testing to ASTM D1922, the machine-direction tear value can be similar to that of hexene LLDPE, but transverse-direction tear is frequently lower because the butene short-chain branch is less effective at interrupting lamellar ordering.
At the molecular level, the short-chain branch length of butene is 2 carbon atoms, compared with 4 for hexene and 6 for octene. The shorter branch increases the probability that the branch is excluded from the ethylene crystal, altering tie-chain density and interlamellar link formation. The result is lower puncture and impact performance under stretching. However, the lower long-chain branching tendency and the broader molecular weight distribution provided by Ziegler-Natta catalysis improve extrusion bubble stability relative to metallocene LLDPE. Operators on high-stalk bubble lines often observe less draw resonance at blow-up ratios above 2.5:1 with FT810-type resins than with narrow-molecular-weight metallocene grades of the same melt index.
The optical penalty is significant. In haze measurement to ASTM D1003, Ziegler-Natta butene LLDPE usually shows higher wide-angle haze than metallocene hexene LLDPE at the same film gauge and cooling rate. Gloss measured at 60° to ASTM D2457 is correspondingly lower. This trade-off is acceptable in agricultural film, heavy-gauge sacks, and laminating webs; it is less acceptable in high-clarity retort or display packaging. Published data for FT810-specific optical values is limited; the current manufacturer technical data sheet must be used for specification.
Film structures that benefit from FT810 include collation shrink film, agricultural greenhouse film, carrier bags, laminating webs, and frozen-food packaging where the sealant layer is not the primary puncture barrier. In heat-seal applications, the peak melting point of an LLDPE with density 0.919 g/cm³ typically lies between 122 °C and 126 °C by ASTM D3418. Heat-seal initiation occurs approximately 15 °C to 20 °C below the peak melting point under laboratory hot-tack testing, but the seal-bar temperature window must be determined with a packaging-line measurement because dwell time and jaw pressure shift the optimum set point by as much as 10 °C.
For heavy-duty applications such as flexible intermediate bulk container liners or dunnage bags, FT810 is not the preferred structure if high puncture resistance is required. A 1-octene LLDPE or a LLDPE/HDPE blend may be more appropriate. In coextruded films, FT810 may serve as the core or skin layer where its bubble stability helps support a metallocene sealant or a barrier layer. When used as a skin layer, the coefficient of friction should be verified to ASTM D1894 after film winding because slip additive migration kinetics depend on winding tension, roll storage temperature, and time.
Regulatory acceptability must be confirmed on the finished article, not on the nominal resin alone. For olefin polymers, compliance with 21 CFR 177.1520(c) is established when the polymer meets the density and extractable requirements of that section and is used in accordance with the conditions of use in 21 CFR 176.170(c). Under European Union food-contact legislation, the finished article must comply with Regulation (EU) No 10/2011, including an overall migration limit not exceeding 10 mg/dm² of contact surface area and specific migration limits for authorised additives listed in Annex I. REACH Regulation (EC) No 1907/2006 requires communication of substances of very high concern if present above 0.1 % w/w in an article. The RoHS Directive 2011/65/EU applies to electrical and electronic equipment; typical polyolefin film formulations meet the restricted substances requirements for cadmium, lead, mercury, hexavalent chromium, PBB, and PBDE when no contaminated recycling feedstock has been used.
| Regulatory reference | Scope | Verification requirement |
|---|---|---|
| 21 CFR 177.1520(c) | Olefin polymers in food-contact articles | Density and maximum extractable fraction; conditions of use per 21 CFR 176.170(c) |
| Regulation (EU) No 10/2011 | Plastic materials in food contact | Overall migration ≤ 10 mg/dm²; specific migration limits for additives |
| Regulation (EC) No 1907/2006 | REACH registration and SVHC communication | Substances of very high concern ≤ 0.1 % w/w |
| 2011/65/EU | RoHS restricted substances | No intentional heavy metals or brominated flame retardants |
FT810 is not suitable for continuous service above 70 °C unless oxidative-induction-time data and oven-ageing tests confirm the required service life for the intended article. Outdoor exposure requires a UV-stabilised formulation; unstabilised LLDPE loses tensile elongation after extended ultraviolet exposure and should be evaluated according to ISO 4892-2 or ASTM D4329. The resin has limited resistance to strong oxidising acids, chlorinated solvents, and aromatic hydrocarbons at elevated temperatures. Swelling may occur in contact with aliphatic hydrocarbons; chemical resistance should be evaluated under ISO 175 using the intended contact medium and temperature before commercial specification. Processing temperatures above 240 °C are not recommended because oxidative degradation reduces molecular weight and can generate gel particles. Blends with high-melt-index polypropylene should be avoided in thin film because phase separation increases surface haze and reduces dart impact.
