LLDPE ZRCC DNDA‑8320
LLDPE Zhenhai Refining & Chemical DNDA‑8320 Resin
Material Introduction: LLDPE Zhenhai Refining & Chemical DNDA‑8320 is injection‑molding grade polyethylene. Featured with high flowability (high melt index), it is well‑suited for manufacturing various daily‑use and industrial articles via injection molding process.
Main Applications
Household utensils: waste bins, storage boxes, containers, lids.
Daily‑use articles: toys, refrigerator accessory components.
Industrial components: automotive parts (inferred from material properties).
Food‑contact applications: available for food‑grade articles such as molded lids according to partial references. Please verify the latest compliance certification from supplier before practical application.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Test Data / Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | GB/T 1033.2 | 0.924‑0.925 g/cm³ | Typical LLDPE density range. |
| Melt Flow Rate (MFR) | GB/T 3682 (190°C/2.16kg) | 20‑21 g/10min | High‑flow feature adapts to injection molding for fast cavity filling. | |
| Mechanical Properties | Tensile Yield Stress | GB/T 1040.2 | 9.82‑10.7 MPa | ‑ |
| Tensile Strain at Break (Elongation at Break) | GB/T 1040.2 | 520‑600 % | Good toughness and ductility to withstand large‑deformation condition. | |
| Charpy Notched Impact Strength (23℃) | GB/T 1043.1 | 66‑69 kJ/m² | Excellent room‑temperature impact resistance. | |
| Other Properties | Pellet Appearance (Discolored Pellets) | SH/T 1541 | ≤3‑5 pcs/kg (premium grade) | Purity indicator; lower value represents higher material cleanliness. |
| Black Pellets | SH/T 1541 | 0 pcs/kg | ‑ | |
| Additive | ‑ | Non‑added | Neat resin, favorable base for subsequent modification such as color‑matching. |
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks & Interpretation |
|---|---|---|
| Drying Treatment | Normally not required | LLDPE features ultra‑low hygroscopicity. Drying is unnecessary under good storage condition. Dry at 60‑70 °C for 1‑2 h as precaution if package damaged or high‑humidity environment. |
| Barrel Temperature | 160‑220 °C | Temperature rises from rear zone to front zone. Reference setting: rear 160‑180°C, middle 180‑200°C, front 190‑220°C. Start debugging at medium‑low temperature to avoid thermal degradation for this high‑MFR grade. |
| Mold Temperature | 30‑60 °C | Low mold temperature (30‑40°C) shortens cycle time and prevents product deformation; higher mold temperature improves surface gloss and reduces internal stress. |
| Injection Pressure | Medium pressure | High flowability permits medium‑low injection pressure. Excessive pressure causes flash; adjust according to product structure and dimension. |
| Injection Speed | Medium‑high speed | Fast injection gives full play to high flowability and improves production efficiency, especially 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 redundant shear heat. |
| Screw Speed | 50‑100 rpm | Moderate rotating speed, prevent excessive shear heat accumulation. |
Disclaimer: All above data is for reference only.
