LLDPE Formosa Plastics 3490
LLDPE Formosa Plastics 3490 Resin
Material Introduction: LLDPE Formosa Plastics 3490 is linear low‑density polyethylene. With ultra‑high flowability, favorable processability and excellent low‑temperature resistance, it is widely used for various injection‑molded articles.
Main Applications
Household utensils & food containers: household basins, food packaging boxes, flexible caps including bottle stoppers and container lids.
Thin‑wall products: ultra‑high melt flow makes it ideal for thin‑wall containers and articles requiring fast cavity filling.
Electrical & electronic components: also applicable for electronic‑electric parts and profiles.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Value & Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D‑1505 | 0.926 g/cm³ | Typical density range for LLDPE. |
| Melt Flow Rate (MFR) | ASTM D‑1238 (190°C/2.16 kg) | 50 g/10min | Ultra‑high flowability, core feature for easy injection filling, especially for thin‑wall parts. | |
| Mechanical Properties | Tensile Yield Strength | ASTM D‑638 | 11.8 MPa (or 120 kg/cm²) | Tensile‑deformation resistance; unit conversion, performance at general LLDPE level. |
| Elongation at Break | ASTM D‑638 | 350 % | Good toughness and ductility, resistant to fracture under large deformation. | |
| Hardness (Shore D) | ASTM D‑2240 | 50 | Provides certain surface scratch‑resistance. | |
| Thermal Properties | Vicat Softening Temperature | ASTM D‑1525 | 95.0 °C | Heat‑resistance indicator. |
| Brittleness Temperature | ASTM D‑746 | ‑70.0 °C | Maintain toughness at low temperature with excellent low‑temperature performance. | |
| Melting Point | FPC / DSC | 124 °C | Full melting temperature for processing‑temperature reference. |
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks & Interpretation |
|---|---|---|
| Drying Treatment | Normally not required | LLDPE moisture absorption＜0.01%. No drying needed under proper storage. Dry at 60‑70 °C for 1‑2 h as precaution if package damaged or high‑humidity environment. |
| Melt Temperature | 170‑190 °C | General LLDPE window 160‑220 °C is also available. For this ultra‑high‑flow grade(MFR=50), start from medium‑low temperature to prevent thermal degradation. |
| Mold Temperature | 30‑60 °C | Mold temperature affects crystallization. Higher mold temperature improves crystallinity and strength, yet may increase shrinkage. |
| Injection Pressure | Medium pressure | Ultra‑high flow permits medium‑low injection pressure. Excessive pressure causes flash; adjust according to product structure and dimension. |
| Injection Speed | Medium‑high speed | High flow realizes fast filling, well‑suited for thin‑wall articles. |
| Holding Pressure | 40%‑60% of injection pressure | Avoid excessive holding pressure and long holding time to reduce internal stress. |
| Back Pressure | 0.5‑1.5 MPa | Low back pressure for melt compaction; excessive back pressure generates extra shear heat. |
| Screw Speed | Medium speed | Restrain excessive shear heat generation. |
Disclaimer: All above data is for reference only.
