LLDPE SABIC 218WJ
LLDPE SABIC 218WJ Resin
Material Introduction: LLDPE SABIC 218WJ is a high‑performance linear low‑density polyethylene. It features easy processability, good tensile properties, impact strength and optical performance, mainly applied for blown‑film products.
Main Applications
Various packaging bags: shopping bags, garbage bags, inner liner bags.
Laminated & co‑extruded films: laminated films, co‑extruded films and consumer‑goods packaging.
Other film products: thin liners.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Value & Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D‑1505 / D‑792 | 0.918 g/cm³ | Typical density range for LLDPE. |
| Melt Flow Rate (MFR) | ASTM D‑1238 (190°C/2.16 kg) | 2.0 g/10min | Good melt flowability, suitable for film processing. | |
| Mechanical Properties | Elongation at Break (MD) | ASTM D‑882 | 700 % | Excellent machine‑direction ductility of film. |
| Elongation at Break (TD) | ASTM D‑882 | 750 % | Excellent transverse‑direction ductility of film. | |
| 1% Secant Modulus (MD) | ASTM D‑882 | 220 MPa | Machine‑direction rigidity of film. | |
| 1% Secant Modulus (TD) | ASTM D‑882 | 260 MPa | Transverse‑direction rigidity of film. | |
| Dart Drop Impact Strength | ASTM D‑1709 | 85‑110 g | Puncture‑resistance and impact‑resistance; higher value represents better performance; slight deviation among sources. | |
| Elmendorf Tear Strength (MD) | ASTM D‑1922 | 130‑135 g | Machine‑direction tear resistance. | |
| Elmendorf Tear Strength (TD) | ASTM D‑1922 | 320‑400 g | Transverse‑direction tear resistance, much higher than MD direction; slight deviation among sources. | |
| Tensile Strength at Break (MD) | ASTM D‑882 | 35 MPa | Machine‑direction tensile capacity of film. | |
| Tensile Strength at Break (TD) | ASTM D‑882 | 29‑59 MPa | Transverse‑direction tensile capacity of film; slight deviation among sources. | |
| Optical Properties | Haze | ASTM D‑1003 | 13‑15 % | Transparency indicator; lower value means higher transparency. |
| Gloss (60°) | ASTM D‑2457 | 60‑80 | Surface‑gloss indicator; slight deviation among sources. | |
| Thermal Properties | Vicat Softening Temperature | ASTM D‑1525 | 98 °C | Heat‑resistance indicator. |
| Additives | Slip Agent | ‑ | approx. 1500 ppm | Improve surface slip property for processing and end‑use. |
| Anti‑blocking Agent | ‑ | approx. 3500 ppm | Prevent blocking between film layers. |
Blown‑Film Processing
For mainstream blown‑film extrusion, temperature, pressure and other parameters shall be optimized according to equipment, film thickness and performance requirements. General processing temperature range for LLDPE blown‑film: 150‑210 ℃.
Blown‑Film Processing Notes
‑ Shear sensitivity: LLDPE presents low shear sensitivity and maintains higher viscosity under shearing such as extrusion, which makes it harder to process than LDPE with identical MFR. ‑ Equipment requirements: Extruders for LLDPE may require higher driving power, higher melt temperature and pressure. Die gap shall be widened (e.g. from LDPE 0.024‑0.040 inch to 0.060‑0.10 inch) to avoid excessive back‑pressure and melt fracture. ‑ Bubble stability: LLDPE blown‑film bubble stability is inferior to LDPE. Dual‑lip air ring is recommended to improve cooling and bubble stability. ‑ Blending for better processability: Many film producers blend LLDPE with LDPE (e.g. 50 % each) to optimize processability and raise output capacity。
Disclaimer: All above data is for reference only.
