| HS Code | 411042 |
| Density | 0.926 g/cm³ |
| Melt Flow Rate | 20 g/10 min (190°C, 2.16 kg) |
| Tensile Modulus | 400 MPa |
| Tensile Stress At Yield | 10 MPa |
| Tensile Strain At Yield | 10% |
| Tensile Stress At Break | 8 MPa |
| Tensile Strain At Break | 50% |
| Flexural Modulus | 420 MPa |
| Shore D Hardness | 55 |
| Vicat Softening Temperature | 90 °C |
| Melting Point | 124 °C |
| Charpy Notched Impact Strength 23 C | 6 kJ/m² |
As an accredited SABIC LLDPE 726QJ factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied as free-flowing pellets in 25 kg polyethylene bags, palletized and stretch-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading of SABIC LLDPE 726QJ, packed in 25 kg bags, palletized, and secured for safe transport. |
| Shipping | SABIC LLDPE 726QJ is supplied as free-flowing pellets, typically shipped in 25 kg bags, jumbo bulk bags, or via bulk tanker. Store in dry, ventilated conditions away from direct sunlight and heat. Handle with clean equipment to prevent contamination. Protect packaging from mechanical damage during transport. |
| Storage | Store SABIC LLDPE 726QJ in a dry, clean, well-ventilated area, away from direct sunlight, heat sources, and open flames. Keep in original sealed bags or containers to prevent contamination and moisture uptake. Avoid generating dust or static charges. Maintain moderate temperatures; no special hazardous storage requirements apply. |
| Shelf Life | Shelf life is indefinite when stored indoors, away from direct sunlight, heat, and moisture, maintaining original properties. |
For a 2.0–3.5 mm geomembrane line, carbon black masterbatch is typically let down at 2.0–3.0 wt% in the core layer to meet weathering requirements without creating stress-crack nucleation sites. The line normally uses a 75–90 mm grooved-feed extruder with a 30:1 L/D ratio, a 2.5–3.5 mm die gap, and a 1.5:1 to 2.0:1 blow-up ratio. Melt temperatures are held between 200°C and 230°C. Temperatures above 240°C accelerate thermo-oxidative degradation of the carbon black masterbatch and reduce oxidative induction time. Carbon black loading above 3.5 wt% is not advised because agglomerate formation in the 20–50 µm range can nucleate stress-cracking sites under ASTM D5397 notched constant tensile load testing. Outer layers are formulated with 0.2–0.4 wt% hindered amine light stabilizer and 0.1–0.3 wt% antioxidant to protect the surface from UV attack. Back pressure at the screen changer should stay below 350 bar; a melt pump is required to keep output variation within ±1.5%. Thickness is measured with a beta gauge and controlled by motorized die lip adjustment at 25 mm intervals. Wedge welding of the 2.0 mm sheets is performed at 350–420°C with a 40–50 mm seam overlap and 1.5–2.5 m/min travel speed; seam peel strength is then checked to ASTM D6392. Terminal products include landfill basal liners, pond liners, canal liners, and heap leach pads. Project specifications commonly reference GRI-GM17 for LLDPE geomembranes, with carbon black dispersion checked to ISO 18553 and stress cracking to ASTM D5397. Where the liner falls under the EU Construction Products Regulation, the relevant harmonised standard for geosynthetic barriers, such as EN 13493, applies. Potable water contact approvals must be obtained from the relevant national certification body; the resin alone does not confer article-level certification. Regrind above 20 wt% should be dried at 65–75°C for 2 h when ambient RH exceeds 60% to prevent porosity in thick sections.
Three-layer agricultural films use SABIC LLDPE 726QJ at 20–40 wt% in the outer and middle layers to raise puncture and tear resistance without exceeding a 30% haze increase in 180 µm film. Total thickness is 150–200 µm. The outer layer contains 0.2–0.4 wt% hindered amine light stabilizer, 0.1–0.3 wt% UV absorber, and 0.3–0.5 wt% antifog concentrate. The die gap is 2.0–2.4 mm. The blow-up ratio is 2.0:1 to 3.0:1. The frost line height is held at 8–10 die diameters. Melt temperatures are 190–210°C. Bubble stability in 200 µm film is controlled by internal bubble cooling. Without IBC, throughput on a 1.8 m die is limited to 350–450 kg/h. With IBC and a 30:1 L/D extruder, output reaches 550–700 kg/h while maintaining thickness variation below ±8%. The tower height is at least 8 m for 200 µm film to allow adequate bubble cooling before the collapsing nip. Additives are compounded as 10–15 wt% concentrates in a compatible LLDPE carrier because direct powder dosing at these low levels causes concentration drift. The film is tested after 14 days of dark storage because stabilizer migration affects surface resistivity and anti-fog performance. Nickel quenchers are not recommended for greenhouse covers where sulfur- and halogen-containing pesticides will be used because metal-based stabilizers can accelerate photodegradation. Mechanical requirements are verified to EN 13206. Tensile strength and elongation are tested per ISO 527-3, and tear resistance per ISO 6383-2. Photosynthetically active radiation transmission is checked with a spectroradiometer; the converter sets the minimum value, often above 85% for new greenhouse covers, but field dust and pesticide exposure reduce that figure. Terminal products include greenhouse roofs, side screens, mulch films, and low tunnels. Article-level compliance with Regulation (EU) No 10/2011 may be required when the film contacts harvested crops; the converter must perform migration testing under the intended temperature and contact conditions.
Pallet loads above 1,200 kg shift the failure mode of stretch hood films from edge tear to puncture propagation, which makes the 0.7 g/10 min melt flow rate of SABIC LLDPE 726QJ suitable for high-toughness hood formulations. A typical blown film structure contains 60–80 wt% 726QJ and 20–40 wt% LDPE with a 0.2–0.4 wt% slip/antiblock concentrate. Die gap is 1.8–2.2 mm. Blow-up ratio is 2.0:1 to 2.5:1. Frost line height is 6–8 die diameters. Melt temperature is 200–220°C. An oscillating haul-off is required to distribute thickness variation to below ±8% because pallet hoods are stretched at 50–90% elongation during application. Thickness variation above ±8% will fail at the corner folds during stretching; therefore a segmented air ring and motorized die lip control are standard. The collapse frames must be set to avoid wrinkling above 4 mm. Re-winder tension is set at 80–120 N/m to avoid blocking. Roll lengths of 1,000–2,000 m are wound on 76 mm cores. Elongation at break is checked to ISO 527-3. Dart impact is checked to ASTM D1709 Method A. Puncture resistance is checked to ASTM D5748. Slip coefficient is maintained in the 0.2–0.4 range because migration above this range reduces load retention and migration below it blocks the unwind. The film must be free of visible gels larger than 400 µm; gel count is commonly monitored with camera-based film inspection systems on the winding section. Terminal articles include hoods for cement, bricks, insulation materials, and beverage bundles. Food-contact hoods used for primary packaging must be validated under Regulation (EU) No 10/2011 and 21 CFR 177.1520(c) by the converter, not the resin supplier.
On high-throughput blown film lines for silage bale wrap, the die gap and blow-up ratio interact to balance machine-direction and transverse-direction tear propagation. Blown film lines use a 2.0–2.4 mm die gap, a 3.0:1 to 3.5:1 blow-up ratio, and 200–230°C melt temperatures. Cast lines use a 0.8–1.0 mm die gap, chill roll temperatures of 15–25°C, and 220–240°C melt temperatures. SABIC LLDPE 726QJ is compounded with 0.3–0.6 wt% hindered amine light stabilizer, 0.2–0.5 wt% titanium dioxide masterbatch, and 1.0–2.0 wt% tackifier for field adhesion. Film thickness is 25–40 µm. The converter verifies tensile and tear properties to EN 14932. The tackifier must be fully dispersed before the die; unmelted tackifier particles above 100 µm cause holes during stretching around baler rollers. Tackifier addition above 2.0 wt% can cause blocking on the winder, so the inner surface is treated with a non-migratory antiblock at 0.1–0.3 wt%. Line speeds are 300–500 m/min. A cast line with a 2,000 mm wide die and vacuum box produces 25–40 µm film with an edge trim below 8 mm. UV stabilization is required for outdoor storage beyond 12 months; below this period HALS loading can be reduced to 0.15 wt%. Film stored above 25°C may lose tack due to additive migration; recommended storage conditions are 5–25°C and below 50% RH. Terminal articles include round and square bale wrap for grass silage, maize silage, and haylage. Article-level compliance with Regulation (EU) No 10/2011 is required when the film is used for direct contact with animal feed; the converter is responsible for migration testing under the intended storage duration and temperature.
Polyolefin compounders add SABIC LLDPE 726QJ to recycled polypropylene at 10–30 wt% to raise notched Charpy impact strength at −20°C. The grade is fed downstream of the main feeder into a corotating twin-screw extruder with a 40:1 L/D ratio and a 10–12 bar vacuum vent. Barrel temperatures are set from 190°C in the feed zone to 230°C at the die. Screw speed is 300–600 rpm. The LLDPE phase must be dispersed to a droplet size below 5 µm because larger domains reduce stiffness and create delamination in injection moulded parts. Notched Charpy impact strength is tested to ISO 179-1/1eA. Tensile modulus is tested to ISO 527-2. Melt flow rate is checked to ISO 1133-1:2022. Addition above 30 wt% is not recommended for applications requiring a tensile modulus above 900 MPa, and the modulus reduction must be quantified per ISO 527-2 before replacing virgin impact copolymer. The gear pump inlet pressure is maintained at 60–100 bar. Strand pelletizing is performed with a water bath at 40–50°C; air knife drying then reduces surface moisture below 0.05%. The compound is injection moulded at 190–230°C with a 40–70 bar back pressure and 60–90 bar holding pressure, depending on part thickness. Terminal products include automotive wheel arch liners, crates, furniture, and battery boxes. Compliance with RoHS Directive 2011/65/EU and REACH SVHC screening is typically checked by the compounder. Food-contact compounds require full migration testing under Regulation (EU) No 10/2011 before article production.
Competitive SABIC LLDPE 726QJ 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!
SABIC LLDPE 726QJ is a linear low-density polyethylene grade supplied for injection molding of thin-walled closures, lids, housewares, and light-duty consumer articles. The product is characterized by a typical melt flow rate of 50 g/10 min at 190 °C under 2.16 kg load, determined according to ISO 1133-1:2022, and a typical density of 0.926 g/cm³ determined according to ISO 1183-1:2019. The high flow index positions the material for multi-cavity tools in which filling pressure and thin-wall flow path are limiting. The grade is not intended for blown film, blow molding, or rotational molding because its low melt strength can compromise bubble stability and sag resistance; in injection molding, the same property supports short cycle times and thin-wall fill.
Table 1 lists representative values from supplier-published technical data, not specification limits. Values are obtained on injection-molded test specimens under standard conditioning. The single-point melt flow rate is not a substitute for capillary rheometry in mold-filling simulation; high-shear viscosity data are required for accurate gate and runner sizing.
| Property | Typical value | Test method |
|---|---|---|
| Melt flow rate, 190 °C/2.16 kg | 50 g/10 min | ISO 1133-1:2022 |
| Density | 0.926 g/cm³ | ISO 1183-1:2019 |
| Tensile stress at yield | 11 MPa | ISO 527-2:2012 |
| Flexural modulus | 260 MPa | ISO 178:2019 |
| Vicat softening point, A50 | 90 °C | ISO 306:2013 |
| Melting temperature, DSC | 122 °C | ISO 11357-3:2018 |
| Shore D hardness | 52 | ISO 868:2003 |
At nominal 50 g/10 min melt flow rate, the viscosity under injection shear rates is low enough to permit filling of wall thicknesses down to 0.8 mm in multi-cavity tools, provided the flow path is balanced and the tool parting line is not worn. The relationship between melt flow index and injection pressure is non-linear; doubling nominal MFR does not halve injection pressure because of shear-thinning and pressure-volume-temperature effects in the melt. At injection shear rates of 10³–10⁵ s⁻¹, linear low-density polyethylene displays pronounced pseudoplastic behavior, and temperature dependence of viscosity follows Arrhenius-type behavior below 240 °C. Capillary rheometry data between 100 s⁻¹ and 10⁴ s⁻¹ should be used for thin-wall part design when fillers or colorants are present.
On reciprocating screw machines with screw L/D ratios of 20:1 to 24:1 and compression ratios near 2.5:1, melt temperature is typically set between 200 °C and 240 °C. Lower temperatures reduce cycle time but increase orientation and residual stress. At melt temperatures below 190 °C, unmelted particles or gels can appear, and the hold-pressure window narrows. Above 250 °C, residence time should be held below 3–5 min because thermal-oxidative chain scission can shift melt flow rate outside the specification envelope and generate discoloration or odor. A shut-off nozzle with positive tip seal is recommended; open nozzles can produce drool and cold slugs in the next shot.
Mold temperatures of 15–35 °C provide a sufficiently frozen skin to prevent ejection marks on high-gloss surfaces. For sections above 2.0 mm, cooling time becomes cycle-limited. Cooling channels arranged along the flow direction reduce differential shrinkage that causes corner warpage in rectangular containers. Post-ejection dimensional changes continue for up to 48 h at ambient temperature; dimensional audits before 24 h may produce misleading pass/fail results. Moisture absorption of unfilled LLDPE is below 0.01% at 23 °C and 50% RH; pre-drying is generally unnecessary. If surface splay is observed on cold regrind or humid masterbatch, drying at 60–70 °C for 1–2 h is appropriate. Overdrying above 80 °C can promote oxidation and raise yellowness index.
In thin-wall lid production below 1.0 mm nominal wall thickness, direct hot-tip gates with tip diameters of 0.8–1.2 mm reduce pressure drop but can increase gate blush. Fan gates or tab gates may be used where appearance is controlled by a matte finish. High-flow LLDPE grades are sensitive to gate freeze; hold time must be increased until gate sealing occurs. Depending on gate thickness and mold temperature, gate sealing can occur between 0.5 s and 2.0 s. Premature hold release causes backflow, sink marks, and increased part-mass variation. Cushion values are maintained at 3–6 mm to provide consistent hold-pressure transmission.
Warpage in 726QJ arises primarily from differential shrinkage. Flow-direction shrinkage is typically 1.5–2.0%, while transverse shrinkage is often 1.0–1.5%, depending on cooling uniformity, pigment dispersion, and part geometry. The difference between these values leads to corner lift and doming in rectangular containers. To reduce warpage, molders may lower melt temperature, reduce pack pressure, or increase cooling uniformity. Each intervention has secondary effects: lower melt temperature increases residual stress, reduced pack pressure increases sink mark depth, and faster cooling can reduce surface gloss. Therefore process boundaries must be defined by part geometry, not resin properties alone.
If mineral-filled modification is required, shrinkage decreases to approximately 0.6–1.0%, but filler addition above 20 wt% increases melt viscosity and lowers impact strength. Contamination with polypropylene at levels above 2 wt% can cause localized unmelt and delamination because of phase separation. Dedicated silos and magnetic separators are recommended for closure production. In colored compounds, metal stearate lubricants above 0.1 wt% may affect printability and seal initiation; the effect should be tested on production tooling rather than laboratory plaques.
Compared with high-pressure low-density polyethylene of similar density, SABIC LLDPE 726QJ has a narrower molecular weight distribution and a less branched backbone. The result is higher tensile yield strength and improved notched impact at comparable density. Direct replacement of LDPE in injection molding usually permits lower wall thickness or shorter cycle time, but the article generally has lower clarity and a harder, less waxy surface. High-pressure LDPE grades retain advantages where melt strength, deep-draw thermoformability, or high clarity are controlling.
Against bimodal high-density polyethylene, 726QJ shows lower flexural modulus, approximately 260 MPa versus 1,000–1,500 MPa for typical injection-grade HDPE, and lower Vicat softening point, approximately 90 °C versus 120–130 °C for HDPE. These differences exclude 726QJ from hot-fill or high-stacking-load service above about 70 °C. However, lower crystallinity provides better environmental stress crack resistance than many injection-grade high-flow HDPE products in lidding and closure applications involving detergents or surfactants. The material is not comparable to polypropylene in stiffness or heat resistance; attempts to use 726QJ in thin-wall PP tooling without adjusting gate sizing and shrinkage allowances can produce dimensional non-conformance.
Published data for direct comparison with metallocene-catalysed linear low-density polyethylene grades are limited. In general, metallocene grades can provide higher puncture resistance and better organoleptic performance at equal density, while the high-flow 726QJ may provide lower melt pressure and easier filling in complex injection molds. Selection for caps, lids, and closures depends on whether low-temperature impact or haze and taste/odor requirements dominate. The base resin grade carries the mechanical properties described here; final article performance depends on masterbatch selection, regrind content, and tooling condition.
In closure molding, the material is processed on high-speed reciprocating screw machines with cycle times between 4 s and 8 s for shot weights of 2.0 g to 8.0 g. The high MFR permits filling of thin tamper-evident bands with wall thicknesses below 0.5 mm, but the same flowability reduces melt strength and permits flash in multi-cavity tools with worn parting lines. On 120 t toggle-clamp machines with 25 mm diameter screws, stable cushion is typically reached within 3–5 shots from cold start. Color change is faster than with lower-MFR grades because lower melt viscosity shortens barrel residence time. However, the same low viscosity increases the risk of backflow over the check ring if the non-return valve is worn. Check-ring leakage above 2% of shot volume produces cavity-to-cavity mass variation and visible sink marks.
Torque retention of screw closures produced from 726QJ is governed by creep of polyethylene. Where sustained top load or child-resistant torque requirements are specified, stress relaxation testing under ISO 899-1:2017 is required on molded closures rather than on resin samples. Published data for this specific closure configuration are limited. For dry resin, pre-drying is not required; however, regrind stored in humid conditions above 60% RH should be dried at 60–70 °C for 1–2 h to remove surface moisture and prevent splay.
If a converter substitutes 726QJ for a 20 g/10 min LLDPE, melt pressure at the nozzle tends to decrease, and fill phases can be shortened. The existing hold-pressure profile may overpack the cavity, causing sticking or flash if vent depths are at the upper limit. The hot-runner manifold should be checked for balanced flow; a high-flow grade can exaggerate imbalance because lower viscosity makes geometric differences more visible in part-mass scatter. Transfer from filling to hold should be set by position rather than time to avoid short shots at high viscosity and flash at low viscosity.
Shrinkage may increase or decrease depending on cooling rate. In general, high-flow, narrow-molecular-weight-distribution grades solidify with less crystallite orientation; warpage can decrease in flow direction but increase in transverse direction if mold temperature differences exceed 5 °C across the cavity. A material substitution therefore requires re-qualification of the dimensional envelope. Dimensional stability after 24 h at ambient temperature should be verified before release to production. For food-contact use, the final article must comply with EU Regulation No 10/2011 and FDA 21 CFR 177.1520(c) under actual use conditions; certification of the base resin does not cover color masterbatches or processing aids. Specific migration testing may be required depending on surface-to-volume ratio and food type.
