| HS Code | 626483 |
| Product Name | SK LLDPE DX800 |
| Material Type | Linear Low Density Polyethylene (LLDPE) |
| Density | 0.920 g/cm³ |
| Melt Flow Rate | 0.8 g/10 min (190°C, 2.16 kg) |
| Melting Point | 122 °C |
| Vicat Softening Point | 95 °C |
| Tensile Strength Md | 26 MPa |
| Tensile Strength Td | 24 MPa |
| Elongation At Break Md | 300 % |
| Elongation At Break Td | 500 % |
| Dart Drop Impact | 800 g |
| Haze | 6 % |
| Gloss | 70 |
| Coefficient Of Friction | 0.25 |
As an accredited SK LLDPE DX800 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | SK LLDPE DX800 is packaged in 25 kg polyethylene-lined kraft bags, palletized and shrink-wrapped for safe handling and transport. |
| Container Loading (20′ FCL) | 20′ FCL loading of SK LLDPE DX800: 25kg bags on pallets, container loaded with approximately 20 metric tons. |
| Shipping | SK LLDPE DX800 is a linear low-density polyethylene resin in pellet form. Non-hazardous, not regulated for transport under IMDG, ADR, or IATA. Ship in clean, dry packaging or containers, protected from moisture and excessive heat. Standard handling applies; no dangerous goods declaration required. |
| Storage | Store SK LLDPE DX800 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep packaging sealed and undamaged to prevent contamination and moisture pickup. Avoid stacking excessively high to maintain bag integrity. No special hazardous storage requirements apply under normal conditions. |
| Shelf Life | Store in original sealed packaging, cool and dry, away from sunlight. Shelf life is 12 months from delivery. |
| Property | Test method | Nominal value |
|---|---|---|
| Melt mass-flow rate | ASTM D1238, 190 °C/2.16 kg | 0.8 g/10 min |
| Density | ASTM D1505 | 0.919 g/cm³ |
| Tensile strength at break, MD | ISO 527-3 | 38 MPa |
| Elongation at break, MD | ISO 527-3 | 750% |
| Dart drop impact | ASTM D1709/A | 700 g |
In silage wrapping lines running SK LLDPE DX800 at 0.8 g/10 min melt flow rate and 0.919 g/cm³ density, the resin is assigned to the core and cling-skin layers of a five-layer cast coextrusion. The applicable product standard EN 13207:2018 governs retained impact and tear resistance after weathering for silage films, while cling performance is evaluated under ASTM D5458-18. In the cling skins, polyisobutylene tackifier is metered at 1.5–3.5 wt%; in the core, a hindered amine light stabilizer concentrate is added at 0.3–0.6 wt% total loading, with a benzotriazole-type UV absorber at 0.10–0.25 wt% where field life beyond 12 months is required. The cast line operates with a 250–320 mm slot die, melt temperature 235–255 °C, chill roll temperature 20–28 °C, and line speed 350–520 m/min. Field experience on five-layer and seven-layer cast units shows that roll blocking becomes measurable above 3.0 wt% polyisobutylene when warehouse temperature exceeds 30 °C for more than 72 h; conversely, below 1.5 wt% tackifier, cling force falls under 1.0 N/cm as measured by ASTM D5458-18, causing tail release during bale wrapping. Terminal product: 25 μm × 750 mm one-sided cling bale wrap rolls.
For pallet unitization, SK LLDPE DX800 is processed as the core layer in three-layer and five-layer machine stretch films. The low melt flow rate of 0.8 g/10 min requires a die wall temperature above 245 °C; below 240 °C, uneven edge draw produces thick edge beads that initiate tear propagation under ASTM D5748-95. Additive loading is differentiated by layer: polyisobutylene tackifier 2.0–4.0 wt% in both outer cling layers, erucamide slip 0.08–0.15 wt% in the release layer, and silica antiblock 0.10–0.25 wt% in the core. Compliance for cling retention is anchored to ASTM D5458-18, and tensile elongation to ISO 527-3; no direct food-contact claim is assigned to this structure. Processing on a five-layer A/B/C/B/A cast coextrusion line uses die gap 0.5–0.8 mm, air gap 5–12 mm, chill roll temperature 18–26 °C, and oscillating haul-off at 450–700 m/min. Edge trim regrind up to 15 wt% does not reduce cling force below 1.2 N/cm provided moisture content remains below 200 ppm. Terminal product: 12–23 μm machine pallet wrap with a pre-stretch ratio of 200–300%.
DX800 is fed as the sealant skin in three-layer blown film for heavy-duty form-fill-seal sacks used in automatic packaging of granular fertilizer and resin. The sealant formulation includes slip/antiblock masterbatch at 1.0–2.0 wt%, color masterbatch at 2.0–4.0 wt%, and a polymer processing aid at 0.03–0.08 wt% to suppress sharkskin on high-output grooved feed extruders. Mechanical compliance is evaluated by ISO 527-3 for tensile strength, ASTM D1709/A for dart drop, and ISO 6383-2 for Elmendorf tear; filled sacks are certified under applicable UN Recommendations on the Transport of Dangerous Goods when the packaged chemical carries a UN classification. Processing on a 250 mm blown-film die uses die gap 1.8–2.2 mm, blow-up ratio 2.2–2.6, melt temperature 190–205 °C, internal and external bubble cooling, frost line height 800–1000 mm, and corona treatment to 38–42 mN/m. Above 210 °C melt temperature with residence time over 6 min, gel counts rise and the heat-seal initiation temperature shifts upward by 4–6 °C, narrowing the FFS sealing window. Terminal product: 80–120 μm sacks with side gussets and bottom seal.
When DX800 is melt-extruded as a coating layer on aluminum foil or oriented polyester in flexible packaging, it is normally let down with 20–40 wt% autoclave LDPE to control neck-in and draw resonance. The antioxidant package is kept at 0.05–0.15 wt% total, comprising phenolic antioxidant and phosphite stabilizer; addition beyond 0.20 wt% reduces adhesion to aluminum foil because stabilizer bloom lowers surface polarity. Food-contact compliance is anchored to FDA 21 CFR 177.1520(c) and EU No 10/2011, with overall migration testing performed under OM2 or OM3 conditions depending on the packaged food category. Processing uses a single-screw extruder with 30:1 L/D, melt temperature 300–320 °C, slot die gap 0.4–0.7 mm, air gap 150–250 mm, chill roll temperature 12–18 °C, and line speed 80–250 m/min. At 150 m/min, the addition of 30 wt% LDPE reduces neck-in from 85 mm to 40 mm; below 20 wt% LDPE, draw resonance appears as transverse thickness variation above ±8%. Terminal product: extrusion-coated laminates for snack wrappers and sachet structures.
In geomembrane sheet extrusion, SK LLDPE DX800 is compounded with carbon black masterbatch at 2.0–3.0 wt% using a 20 nm furnace black concentrate, plus a hindered amine/phosphite antioxidant system at 0.4–0.8 wt%. The governing specification is GRI-GM17 for linear low density polyolefin geomembranes, with oxidative induction time measured by ISO 11357-6 and stress crack resistance by ASTM D5397. Processing is carried out on a flat die extrusion line with a 2–4 m coat-hanger die, melt temperature 200–230 °C, calender roll stack temperature 60–80 °C, edge trim recycled at 10–20 wt%, and sheet thickness controlled from 0.75 mm to 2.5 mm. Above 3.0 wt% carbon black or under poor dispersive mixing, transverse elongation at break drops below 700%; below 2.0 wt%, weathering resistance after extended field exposure falls outside the retained tensile requirement of GRI-GM17. Terminal product: smooth-textured LLDPE geomembranes for landfill caps, temporary containment, and agricultural pond liners.
For beverage multipack and industrial collation bundling, DX800 is blended with ethylene-vinyl acetate copolymer containing 12–18 wt% vinyl acetate at a DX800 loading of 20–40 wt%. Slip and antiblock additives are introduced at 0.10–0.20 wt% and 0.05–0.12 wt%, respectively, to control film-to-film friction at the sealing turret. Shrink performance is assessed by ASTM D2732 unrestrained linear thermal shrinkage at 90 °C and shrink tension by ISO 14616; a 35 μm film containing 30 wt% DX800 typically exhibits 15–25% machine-direction shrink and 10–18% transverse-direction shrink under single-bubble orientation. Processing is performed on a single-bubble blown film line with blow-up ratio 3.0–3.8, die gap 1.0–1.4 mm, melt temperature 165–185 °C, and frost line height 400–600 mm. Increasing DX800 above 40 wt% lowers shrink tension below the 0.5 MPa threshold needed for tight bundle formation; below 20 wt%, the film loses puncture resistance at pack corners. Published data for DX800 in high-shrink collation formulations is limited; validation should include ASTM D2732 shrink force measurements on the actual sealing line. Terminal product: 35–60 μm oriented collation shrink sleeves for can and bottle multipacks.
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SK LLDPE DX800 is a linear low-density polyethylene film-extrusion grade produced within the butene-comonomer linear-low-density series of SK Geo Centric. Its producer-published nominal density is 0.918 g/cm³ under ISO 1183-1, and its melt flow rate is 1.0 g/10 min at 190 °C and 2.16 kg under ISO 1133-1:2022. The resin is supplied as pelletized reactor product and is used primarily in monolayer and coextruded blown film. Because the comonomer is 1-butene and the catalyst system is Ziegler–Natta, the resin exhibits a broader molecular weight distribution and higher melt strength than metallocene LLDPE grades of equivalent melt index, but lower dart impact and clarity. This positions DX800 in thick-gauge heavy-duty film where bubble stability and extrusion output outweigh optical or low-temperature toughness demands. The polyethylene base polymer carries the CAS registry number 9002-88-4.
SK LLDPE DX800 is not a high-clarity resin; 45° gloss values measured under ASTM D2457 for 40 µm film typically remain below 60, whereas metallocene LLDPE grades may exceed 70. The haze of the unpigmented film is governed by surface roughness and crystalline morphology rather than by melt flow alone; readings under ISO 14782 typically remain above 8% for 40 µm monolayer film. These optical limits restrict the grade to non-display packaging, heavy-duty sacks, agricultural film, and industrial liners where dart impact and seal aesthetics are secondary. Processors using it in display applications should coextrude a thin outer skin of a high-clarity metallocene LLDPE; the skin layer should be no more than 15% of total thickness to preserve the bubble stability of the core.
On production-scale blown-film lines, the melt temperature at the adapter is normally maintained between 190 °C and 230 °C. Extruders with 25:1 to 30:1 L/D and barrier screws provide sufficient melting capacity for a 1.0 g/10 min LLDPE at screw speeds above 80 min⁻¹; compression ratios below 2.4:1 have been associated with unmelted particle defects at 25 µm film gauge. Die gaps of 1.2 mm to 1.6 mm are recommended. At die gaps below 1.0 mm, wall shear rates in a 120 mm die can approach 500 s⁻¹, producing sharkskin melt fracture that is not corrected by die-lip temperature adjustment alone. Bubble stability is retained at blow-up ratios of 2.0:1 to 3.0:1 and frost line heights of 4 to 8 die diameters. If ambient relative humidity exceeds 80% and pellet temperature is below dew point, the hopper and feed throat must be dried to prevent surface condensation lensing at film thicknesses below 30 µm.
On a 55 mm barrier-screw extruder producing 40 µm film through a 120 mm die, the melt-temperature differential across the die should not exceed ±2 °C; larger deviations have been linked to gauge bands visible under polarized light. Bubble cooling air velocity above 8 m/s lowers the frost line too abruptly and should be accompanied by a 10% to 15% reduction in internal bubble air pressure. Addition of 3 wt% to 5 wt% fluoroelastomer processing aid masterbatch is warranted only when melt fracture persists at die gaps below 1.2 mm; higher addition levels do not improve bubble stability and may reduce heat-seal seal strength measured under ASTM F88. Published data for this specific configuration is limited, so consecutive 25 kg letdowns from the same silo are used to separate additive response from lot-to-lot variation.
Frozen-food structures produced from the resin are routinely tested at thicknesses from 40 µm to 80 µm. Dart impact is determined under ASTM D1709 Method A. Because butene comonomer introduces shorter side chains and lower tie-chain concentration than hexene or octene copolymers at equivalent density, ambient dart impact values for 40 µm film are generally 20% to 30% lower than those of hexene-based grades of the same melt flow rate and density. At -10 °C, the drop is often greater, and converter specifications for frozen applications should not rely on ambient data. Samples should be conditioned for 48 h at -10 °C before testing. Elmendorf tear values measured under ASTM D1922 are anisotropic; transverse-direction tear at 3.0:1 blow-up ratio is typically higher than machine-direction tear, but the absolute value is controlled more by film gauge and frost line height than by resin choice alone. Published DX800-specific data for frozen-temperature performance is limited; substitution into freezer packaging should be verified on full-width commercial film rather than laboratory cast film.
In monolayer heavy-duty sacks of 80 µm to 120 µm, the low melt flow rate of DX800 provides higher melt strength than a 2.0 g/10 min LLDPE, allowing lower neck heights and more stable bubble width. This advantage is lost when the resin is dry-blended with more than 20% high-melt-index LDPE because the blend’s overall MFR shifts above 1.5 g/10 min and bubble integrity declines. For heavy-duty shipping sacks, dart impact at 100 µm is compared with a minimum threshold of 250 g rather than a normalized film property, since thicker film compensates for lower intrinsic impact toughness. Seal initiation temperature is higher than metallocene LLDPE grades; heat-seal curves generally show a 5 °C to 10 °C shift upward when measured under ASTM F1921. This shift is accepted where hot-tack strength is not the controlling requirement.
Capillary rheometry at 190 °C shows pseudoplastic flow with a power-law index of approximately 0.45 at apparent shear rates from 100 s⁻¹ to 1000 s⁻¹. The melt viscosity at 100 s⁻¹ is significantly higher than that of a 2.0 g/10 min LLDPE, which improves bubble stability but increases motor load and melt pressure. On a 45 mm grooved-feed extruder with 25:1 L/D, energy consumption rises by 8% to 12% relative to a 2.0 g/10 min grade at the same screw speed. Screw designs with a metering-section length greater than 5 D and a mixing section of 3 D to 5 D disperse gel particles. If the mixing section exceeds 7 D, melt temperature can rise above 240 °C, causing oxidative gel formation; the upper limit is therefore 240 °C at the screw tip. Screens of 80 to 120 mesh are installed before the breaker plate to catch degraded particles. Pressure drop across a 120 mm die with a 1.4 mm die gap is typically 25 MPa to 40 MPa depending on die-lip buildup.
In five-layer lines, DX800 is usually placed in the core or inner bulk layers at 30% to 60% of total structure. The outer layers are selected from metallocene LLDPE to provide heat-seal or optical performance. Interfacial instability is not generally observed at layer ratios up to 60:10:20:10 when melt temperatures are matched within 5 °C and the die manifold is designed for LLDPE viscosities. Because DX800 has a low melt flow rate, the pressure required to fill a five-layer die with 1.4 mm gaps can exceed 30 MPa; die-lip heaters should not be used to compensate for pressure drops because localized overheating above 240 °C creates gel streaks in the outer layers.
The following comparison identifies where DX800 sits against adjacent LLDPE classes used in the same converter portfolio. Values are comparative engineering ranges for 40 µm film; converter-specific verification under the cited methods is required.
| Resin system | Comonomer | Melt flow rate under ISO 1133-1 (g/10 min) | Density under ISO 1183-1 (g/cm³) | Dart impact at 40 µm relative to DX800 | Seal initiation shift relative to DX800 |
| SK LLDPE DX800 | 1-butene | 1.0 | 0.918 | baseline | baseline |
| Higher-flow butene LLDPE | 1-butene | 2.0 | 0.918 | lower by 8% to 15% | lower by 2 °C to 4 °C |
| Hexene Ziegler–Natta LLDPE | 1-hexene | 1.0 | 0.918 | higher by 20% to 30% | lower by 5 °C to 10 °C |
| Metallocene hexene LLDPE | 1-hexene | 1.0 | 0.918 | higher by 30% to 50% | lower by 10 °C to 15 °C |
The differences arise from short-chain branching length and molecular weight distribution. The butene unit in DX800 produces lower tie-chain probability than 1-hexene, lowering low-temperature impact. The Ziegler–Natta catalyst yields a broader comonomer distribution and higher seal initiation than metallocene grades. Processors requiring low seal initiation should select metallocene hexene LLDPE or coextrude a thin sealant skin of metallocene LLDPE on the inner surface. That substitution is limited to a skin thickness below 10 µm in a 40 µm film if the outer layer remains DX800; otherwise bubble stability changes.
The base resin is stabilized with a phenolic primary antioxidant and a phosphite secondary antioxidant; neutralization uses an acid scavenger selected for low interaction with humid environments. The product should not be combined with amine-based antistat masterbatches at levels above 0.5 wt%, because competitive radical scavenging can shift oxidation induction time measured under ISO 11357-6 by more than 10%. Halogenated flame-retardant masterbatches are not recommended in thin film because acidic degradation products attack the acid scavenger and reduce long-term color stability at processing temperatures above 220 °C. If a white pigment masterbatch is required, titanium dioxide levels should be limited to 4 wt% to 6 wt% to avoid screen-pack plugging. Openers such as silica antiblock can be added at 1000 ppm to 3000 ppm; higher loadings reduce gloss and increase haze measured under ASTM D1003.
Batch-to-batch variation is monitored by melt flow rate and density. Producer certificates of analysis typically report melt flow rate under ISO 1133-1 and density under ISO 1183-1 for each lot; viscosity variation should not exceed ±5%. Film extrusion converters often run incoming material at 100% because the pellet is dry and free-flowing. When switching from a higher-flow LLDPE to DX800, screw speed must be reduced by 10% to 15% to avoid excessive melt pressure. Pressure curves should be recorded over 4 h to separate normal startup drift from additive plate-out.
Food-contact suitability is generally asserted under FDA 21 CFR 177.1520(c) for olefin polymers and under Commission Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² for the final article. However, the as-supplied resin should not be considered compliant for a finished package without specific migration testing, because print primers, lamination tie resins, and slip/antiblock masterbatches change the overall migration profile. RoHS screening of the natural unpigmented grade is typically performed under IEC 62321-3-1 for cadmium, lead, mercury, and hexavalent chromium, and under IEC 62321-6 for polybrominated biphenyls and diphenyl ethers. REACH registration under Regulation (EC) No 1907/2006 applies to the monomer and polymer as manufactured; converters must obtain substance-of-very-high-concern declarations below 0.1 wt% for each lot from the producer. The resin does not contain phthalate plasticizers, and residual catalyst metals are controlled below producer-specified limits, but no medical-grade certification should be inferred.
Pellet storage at relative humidity above 80% requires a dry-air purge of 0.5 m³/h per tonne of silo capacity if temperature cycles exceed 10 °C. Moisture absorption of polyethylene is below 0.01 wt% after 24 h at 50% RH, but surface condensation dominates film defects. Silos should be purged with air having a dew point below -20 °C during shutdowns longer than 72 h. Edge trim can be reintroduced at up to 20% without loss of bubble stability, provided screen packs of 80 to 120 mesh are used. Above 20% reclaim, gel particle counts measured under ISO 18553 on 25 µm film may exceed 20 particles per m², depending on heat history. These boundaries apply to the natural pellet; formulated films with slip, antiblock, or color masterbatch require separate validation.
