Sinopec Qilu mLLDPE Q504
- Product Name: Sinopec Qilu mLLDPE Q504
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Sinopec Qilu mLLDPE Q504 is typically used in formulations when density and melt index and melt temperature and die pressure must be controlled within specific ranges.
| HS Code | 704045 |
| Melt Flow Rate | 1.0 g/10 min |
| Density | 0.918 g/cm³ |
| Tensile Strength At Yield | 10 MPa |
| Tensile Strength At Break | 25 MPa |
| Elongation At Break | 550 % |
| Dart Impact Strength | 1200 g |
| Elmendorf Tear Strength Md | 150 g |
| Elmendorf Tear Strength Td | 350 g |
| Haze | 8 % |
| Gloss 45 | 85 % |
| Melting Point | 118 °C |
| Vicat Softening Point | 95 °C |
As an accredited Sinopec Qilu mLLDPE Q504 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sinopec Qilu mLLDPE Q504 is supplied in 25 kg woven bags, palletized for bulk handling and storage. |
| Container Loading (20′ FCL) | Sinopec Qilu mLLDPE Q504 is palletized and loaded into a 20′ FCL container, securely stowed for ocean shipment. |
| Shipping | Sinopec Qilu mLLDPE Q504 is supplied in 25 kg PP woven bags or jumbo bags on pallets, shipped in dry covered containers or trucks. Keep dry, away from direct sunlight, heat, and contaminants. Store in a cool, ventilated warehouse. Non-hazardous polymer; observe SDS and local regulations. |
| Storage | Store Sinopec Qilu mLLDPE Q504 in a cool, dry, well-ventilated warehouse, away from direct sunlight, heat, moisture, and ignition sources. Keep original packaging sealed and undamaged to prevent contamination. Stack pallets securely and avoid excessive loads. Maintain good housekeeping, minimize dust, use first-in, first-out rotation, inspect regularly, and follow the manufacturer’s SDS and local storage regulations. |
| Shelf Life | Sinopec Qilu mLLDPE Q504 shelf life is typically 24 months when stored dry, cool, and ventilated in unopened original packaging, away from direct sunlight. |
Cast Pallet Wrap Extrusion: Neck-In Control and Tackifier Migration Windows
Sinopec Qilu mLLDPE Q504 is introduced into five-layer cast stretch film structures at 65–80 wt% in the core and sub-skin layers, while the cling layer is typically limited to 40–55 wt% with an LDPE carrier and a polyisobutylene tackifier masterbatch at 2–4 wt%. The applicable film property framework includes ASTM D5748-22 for stretch wrap puncture resistance, ASTM D882-18 for tensile yield and elongation at break, and ASTM D5458-19 for cling evaluation. On production-scale cast film lines using single-screw extruders with 33:1 L/D, a 0.50–0.60 mm die gap, and a 2,400 mm die width, the material is processed at melt temperatures of 240–255 °C; the narrow molecular weight distribution of Q504 lowers melt strength relative to conventional Ziegler-Natta LLDPE, so edge neck-in reaches 18–22 mm per edge at line speeds of 250–350 m/min unless the air knife is held at 4–6 m/s and the chill roll is maintained at 18–22 °C. A sustained chill roll temperature above 24 °C delays solidification and increases gauge variation to ±2.5% at 23 µm nominal thickness, while a temperature below 16 °C increases the tendency for surface condensation-driven optical haze. After 72 h at 30 °C, tackifier migration can cause roll blocking when the cling-layer tackifier masterbatch exceeds 5 wt%; the core dilution provided by Q504 at 65–80 wt% reduces this tendency but does not eliminate it. Terminal products from this configuration include machine-grade pallet wrap, engineered pre-stretch hand wrap with 150–250% pre-stretch on powered wrappers, and reduced-tail cling films for automated palletizing.
Across three-layer coextruded blown film lines producing sealant webs for frozen-food pouches and bag-in-box liners, Q504 is added at 20–40 wt% in the sealant layer, while the core and outer skin layers carry 10–25 wt% to maintain heat-seal initiation below 98 °C at 0.3 s dwell as evaluated by ASTM F2029-16 and hot tack by ASTM F1921-18. The applicable food-contact framework is FDA 21 CFR 177.1520(c)3.2a, EU Regulation (EU) No 10/2011 with overall migration below 10 mg/dm², and GB 9685-2016 for additives used in food-contact materials. The downstream process employs a 1.8–2.2 mm die gap, blow-up ratio of 2.2–2.6:1, melt temperature of 185–210 °C, and frost line height maintained at 6–8 die diameters with internal bubble cooling air flow at 12–18 m³/h. On high-speed vertical form-fill-seal equipment operating at 70–90 cycles/min, the addition of Q504 in the sealant layer widens the hot-tack window by 8–12 °C compared with conventional LLDPE grades, reducing burn-through during dwell, but at addition above 40 wt% blocking tendency in roll form after 48 h under 0.2 N/mm² compressive load becomes measurable. Terminal products include frozen vegetable bags, cereal box liners, side-gusset dry-mix pouches, and bag-in-box liners for liquid condiment packaging.
What Limits UV Stabilizer Masterbatch Loading in Three-Layer Greenhouse Structures?
For agricultural film structures where Q504 is used as the major polyolefin carrier resin in the core layer, the addition ratio is held at 30–50 wt%, with outer layers at 10–20 wt%, while UV stabilizer masterbatch is loaded at 6–10 wt% and high-molecular-weight hindered amine light stabilizer at 0.2–0.5 wt%. The applicable product standard is EN 13206:2017 for covering films used in agriculture and horticulture, with tensile property evaluation under ISO 527-3:2018 and impact resistance under ISO 7765-1:2009; food-contact migration requirements under EU No 10/2011 apply only where direct fermenting-feed contact is intended. Production on three-layer blown film lines uses a 1.5–2.4 mm die gap, blow-up ratio of 2.0–2.5:1, melt temperatures of 190–215 °C, dual-lip air rings, and internal bubble cooling at 15–25 m³/h. The processing boundary at 12 wt% UV masterbatch is critical: higher loadings reduce screw feeding consistency because the carrier resin in some masterbatches acts as a slip agent, leading to melt pressure fluctuation of ±0.6 MPa and visible die-lip plate-out after 48 h of continuous run. EVAc-containing infrared-retention masterbatches require pre-drying at 65–75 °C for 4 h when ambient relative humidity exceeds 60%. Terminal finished products include transparent and diffused greenhouse covers, silage stretch wraps, and perforated mulch films.
Where high dart impact and tear resistance are required in FIBC liners and heavy-duty sack films, Q504 is formulated at 40–70 wt% with high-molecular-weight HDPE and minor LDPE to achieve a 50–80 µm film that withstands ISO 7765-1:2009 dart drop impact and ASTM D1922-09 Elmendorf tear. The applicable packaging standard for flexible intermediate bulk container liners is ISO 21898:2004, with additional verification under ASTM D1709-22 for film impact and ISO 527-3:2018 for tensile properties. The production process is high-stalk coextrusion blowing on multi-layer lines with a die gap of 2.0–2.4 mm, blow-up ratio of 1.6–1.8:1, melt temperature 205–225 °C, and dual-lip air ring operation at 10–15 m³/h internal bubble air flow. At Q504 addition above 70 wt%, the narrow molecular weight distribution reduces bubble stability on single-lip air ring lines, producing gauge variation greater than ±5% at layflat widths exceeding 1,600 mm; this condition requires a lower frost line height or a dual-lip air ring. Terminal products include liner films for flexible intermediate bulk containers, liners for polypropylene woven sacks, and heavy-duty industrial packaging for coarse granular chemicals.
When Melt Temperature Drops Below 270 °C in Extrusion Lamination of Metallocene LLDPE
In extrusion lamination and extrusion coating of flexible packaging, Q504 is blended with extrusion-coating-grade LDPE at 15–40 wt% for sealant webs, while three-layer coextrusion lamination positions the resin at 50–80 wt% in the sealant layer to permit lower sealing stress on high-speed pouching lines. The applicable compliance references are FDA 21 CFR 177.1520(c)3.2a, EU No 10/2011 with overall migration below 10 mg/dm², and peel adhesion testing under ASTM D1876-08. The downstream process uses an extrusion coating line with a 33:1 L/D screw, a 1.2–1.8 m die width, a 0.5 mm die gap, melt temperature of 270–295 °C, chill roll temperature of 15–20 °C, and line speed of 150–250 m/min. Below 270 °C melt temperature, the low melt strength of mLLDPE Q504 causes excessive neck-in exceeding 45 mm per edge and adhesion to the chill roll becomes inconsistent at speeds above 200 m/min, as measured by visual release and peel strength reduction to 1.5–2.0 N/15 mm. Above 40 wt% Q504, draw resonance appears at line speeds above 250 m/min as edge oscillation of ±3 mm and coat-weight variation exceeding ±5%, requiring electrostatic pinning and air-knife edge hold-down. Terminal products include stand-up pouch sealant webs, sachet laminates, and medical device overwrap laminations.
Impact Modification of Recycled HDPE Using a Narrow-MWD Metallocene LLDPE at 10–30 wt% Addition
For downstream compounding applications, Q504 is added at 10–30 wt% to post-consumer HDPE to offset brittleness in injection-molded articles without reducing flexural modulus below 800 MPa as measured by ISO 178:2019. The applicable regulatory framework includes REACH 1907/2006 Article 33 communication for substances of very high concern, RoHS 2011/65/EU Annex II where final components enter electrical and electronic equipment, and ISO 11469:2016 for polymer identification marking. The process uses a co-rotating twin-screw extruder with 44:1 L/D, barrel zones at 200–220 °C, screw speed 300–500 rpm, and vacuum degassing at -80 to -95 kPa to remove volatile residues from recycled feedstock. At addition above 30 wt%, the resulting compound shows measurable reduction in stiffness: flexural modulus drops below 750 MPa and heat deflection temperature under 1.8 MPa load by ISO 75-2:2013 declines by 4–6 °C, which limits use in rigid load-bearing crates. Published data for this exact Q504-recycle compound configuration is limited, but the stated ranges correspond to general behaviour observed with narrow-MWD metallocene LLDPEs and are to be validated with lot-specific melt flow and impact data. Terminal products include injection-molded storage crates, household containers, and non-critical automotive interior trim panels.
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- Sinopec Qilu mLLDPE Q504 is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Sinopec Qilu mLLDPE Q504 is a metallocene-catalyzed linear low-density polyethylene pellet supplied by Sinopec Qilu Petrochemical at its Zibo, Shandong polymer train. The grade code Q504 belongs to the Qilu mLLDPE blown-film series and is sold as a neat polyolefin base resin rather than a compounded film formulation. Converters receive the material in 25 kg multilayer bags, bulk hopper trucks, or intermediate bulk containers, depending on batch size and regional logistics. The model designation Q504 appears on the packaging label and on the certificate of analysis together with lot number, production date, and nominal melt quality. Published data for the exact Q504 configuration is limited; for preliminary line evaluation, Q504 falls within the density interval 0.916–0.922 g/cm³ and melt mass-flow rate interval 0.9–1.1 g/10 min under ISO 1133-1:2022 at 190 °C and 2.16 kg. These are class-level orientation values for metallocene film-grade LLDPE and must not replace lot-specific release limits.
The resin is used in monolayer and coextruded blown film where low heat-seal initiation, high dart impact, and low haze are required. Unlike broad-molecular-weight Ziegler-Natta linear low-density polyethylene, the single-site catalyst architecture behind Q504 promotes a narrow molecular weight distribution and a more homogeneous short-chain branch distribution. The consequences appear in melt rheology, sealing, optics, and tear behavior.
What Test Methods Govern Qualification of Q504?
Incoming resin tests and film qualification are not interchangeable. A converter or brand owner typically builds a test matrix from resin-pellet methods, blown-film physicals, and finished-package seal trials. The following matrix lists the methods commonly applied to Q504-class film webs. Absence of a value in the table is intentional because the certificate of analysis is the only valid source for lot-specific results.
| Property | Standard method | Measurement condition | Interpretation focus |
|---|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 190 °C, 2.16 kg | Correlates with pumping pressure; not molecular architecture. |
| Density | ISO 1183-1:2022 | 23 °C on conditioned plaque | Stiffness, barrier, and thermal resistance. |
| Tensile strength at yield/break | ISO 527-3:2018 | 500 mm/min, 23 °C, 50% RH | Directional orientation in machine and transverse directions. |
| Elmendorf tear resistance | ISO 6383-2 | Pendulum tear, as supplied | MD tear often lower for mLLDPE; monitor orientation. |
| Dart impact resistance | ISO 7765-1 or ASTM D1709 | Phenolic dart, 38 mm diameter | High-speed puncture behavior. |
| Haze | ISO 14782 | 25 μm film, 23 °C | Comonomer uniformity and surface roughness. |
| Gloss | ASTM D2457 | 60° specular geometry | Melt fracture and die-lip performance. |
| Coefficient of friction | ISO 8295 | 100 mm/min sled | Slip/antiblock package and corona effects. |
| Melting endotherm | ISO 11357-3 | 10 °C/min nitrogen purge | Shoulder detection indicates linear fractions. |
| Oxidative-induction time | ISO 11357-6 | 200 °C oxygen flow | Stabilizer level and extrusion thermal history. |
Gel count is often controlled by a screen-pack test on a single-screw extruder rather than by an optical standard. Incoming Q504 granules are examined after passage through a 200-mesh screen; a rapidly rising pressure drop indicates gel or foreign matter. Because Q504 is a neat resin, the slip and antiblock system is not inherently fixed; converters add masterbatch to reach a target coefficient of friction and blocking force. The standard method designations above are accuracy-critical; equivalent GB/T methods may be used in Chinese converter QC, but the lot certificate will normally reference GB/T 3682.1-2018 for melt flow rate and GB/T 1040.3-2006 for film tensile properties.
Rheological Constraints in Single-Site mLLDPE Extrusion
The narrow molecular weight distribution of Q504 produces less shear thinning than a broad-molecular-weight Ziegler-Natta LLDPE of identical melt index. On a 75 mm single-screw extruder with 30:1 L/D and a grooved feed section, breaker-plate pressure may run 10%–20% higher than a Ziegler-Natta C4-LLDPE at 180 kg/h. The narrow molecular weight distribution reduces shear thinning, so barrel settings are typically flat or slightly reverse: feed 170 °C, barrel 180–200 °C, adapter 200–210 °C, and die 210–220 °C. These settings are starting points for a 150–250 mm die and a single-lip air ring; they must be adjusted for melt filtration pressure and bubble stability.
Published data for the exact Q504 configuration is limited; the processing observations above are drawn from technical bulletins for metallocene film grades in the same density and MFR class.
Die gap selection is critical for sharkskin melt fracture. At die gaps below 1.0 mm, the high shear stress at the die wall can exceed the critical stress for slip-stick flow; widening the gap to 1.5–2.5 mm and adding a fluoropolymer processing aid at 200–500 mg/kg suppresses surface fracture without significantly changing seal strength. Low melt strength can lead to bubble flapping and gauge variation, so converters add high-pressure LDPE at 10–20 wt% or use an internal bubble cooling air ring above 100 kg/h throughput. The added LDPE stabilizes the bubble but raises haze and reduces dart impact.
Melt temperature should not exceed 250 °C for extended periods. Oxidative gels form preferentially in the high-shear screw tip and screen-pack zones; if a gel band appears, the melt temperature and extrusion pressure are lowered before increasing processing aid. Residence time below 4 min is typical for an 80 mm grooved-feed extruder running between 150 kg/h and 220 kg/h.
On a 3-layer coextrusion line with an A/B/A configuration, Q504 can be placed in the skin layers while a LDPE or HDPE core supplies melt strength and stiffness. The core layer reduces the amount of Q504 that must carry the bubble stress, but it does not remove the need for low-shear die-lip geometry. A practical starting condition is a blow-up ratio of 2.0–3.0, frost-line height 400–700 mm above the die, and die gap 1.8–2.2 mm. The film gauge interval is typically 25–80 μm for packaging webs; heavier agricultural film may require a die gap above 2.5 mm to keep shear stress low.
Corona treatment is applied to Q504 sealant webs at 38–42 mN/m for lamination or printing. Dyne level should be measured within 24 h because treated mLLDPE surfaces decay more slowly than LDPE but still reorient. Rechecking is required after 30 days for stored film. Excessive treatment above 46 mN/m can generate low-molecular-weight oxidized species that interfere with seal strength and increase haze.
When Q504 Replaces a Ziegler-Natta C4-LLDPE in Sealant Layers
Replacing a conventional butene-based Ziegler-Natta LLDPE with Q504 changes the heat-seal response of a packaging web. The more homogeneous short-chain branch distribution reduces the high-density linear fraction that otherwise raises seal initiation. Published comparative studies for mLLDPE film resins in this density class report seal initiation temperatures 8–15 °C lower than C4-LLDPE at equivalent gauge and sealing pressure. Seal testing is conducted on a gradient-temperature jaw at 200–250 N bar pressure and 0.5 s dwell; the hot-tack window is measured separately by ASTM F1921-18 or ISO 19430:2016 under the same sealing conditions.
The property trade-off is machine-direction tear. mLLDPE films with narrow orientation may show lower MD Elmendorf tear than a Ziegler-Natta C4-LLDPE of the same gauge, even though dart impact is higher. If the package is loaded parallel to the machine direction, a thicker film gauge or a transverse-direction orientation adjustment may be required. The conversion decision should therefore use a multi-axis tear and impact matrix rather than a single property comparison.
Compared with high-pressure LDPE, Q504 has no long-chain branching, lower melt strength, higher elongation at break, and higher dart impact at equal gauge. Compared with HDPE, Q504 has much lower modulus and Vicat softening temperature, making it unsuitable for rigid containers or high-temperature fill lines. Compared with C8 mLLDPE, Q504 may have a slightly lower toughness if the comonomer is hexene, but the official grade datasheet and COA are required to confirm comonomer type and intended film performance.
Food-contact suitability is a converted-article test, not a resin certificate.
Food-contact suitability is a condition of the finished article, not a direct property of the neat pellet. Q504 can be used in food-packaging layers if the specific lot meets the relevant positive-list framework. In China, GB 9685-2016 governs additives and GB 4806.7-2016 covers food-contact plastics; in the European Union, Regulation (EU) No 10/2011 sets an overall migration limit of 10 mg/dm² and specific migration limits for authorized substances. For U.S. applications, 21 CFR 177.1520 covers olefin polymers. A converter must obtain a suitable declaration from Sinopec Qilu or its distributor and must validate the additive package under the intended food type and temperature.
For non-food technical films, REACH registration is maintained by the EU importer. RoHS Directive 2011/65/EU applies only if the converted article is within the scope of electrical and electronic equipment; as a bulk packaging resin, Q504 is not classed as an EEE material. The resin should not be viewed as implantable or medical-grade, and continuous service above 70–80 °C in load-bearing applications requires creep and oxidation data beyond standard film qualification.
Pre-drying is not routine. If bags have been opened or stored at relative humidity above 60% for more than a few days, surface moisture can produce bubble instability and specks. A hopper dryer at 70–80 °C for 2–4 h is sufficient for this density class. Avoid blending with unsaturated or amine-containing processing aids that can initiate discoloration or gel formation.
Q504 is also used in high-speed form-fill-seal machines where lower seal initiation allows shorter jaw dwell and faster packaging speeds. The seal bar temperature is typically reduced by 5–10 °C compared with a C4-LLDPE film; jaw opening time is set from hot-tack curves to avoid stringing at the cut. The film’s high dart impact contributes to resistance to puncture by rigid product edges, but corner puncture is more geometry-dependent and should be tested with a probe or pallet simulation.
