LDPE Hanwha 737
LDPE Hanwha 737 Resin
Material Introduction: LDPE Hanwha 737 is low‑density polyethylene featured with high flowability, excellent transparency and surface gloss, mainly applied for injection‑molding process.
Main Applications
Daily necessities: household articles, toys.
Packaging containers: container lids, bottle caps and daily‑use products.
Other applications: suitable for general‑purpose injection‑molded parts due to favorable processability.
Performance Parameters
| Performance Category | Test Item | Test Method / Condition | Test Data / Unit | Remarks & Interpretation |
|---|---|---|---|---|
| Basic Properties | Density | ASTM D1505 | 0.915 g/cm³ | Typical LDPE density range with light weight. |
| Melt Flow Rate (MFR) | ASTM D1238 (190°C/2.16kg) | 22.0 g/10min | High flowability, ideal for thin‑wall articles requiring fast cavity filling. | |
| Mechanical Properties | Tensile Yield Strength | ASTM D638 | 8.83 MPa (90 kg/cm²) | General strength level for LDPE. |
| Tensile Breaking Strength | ASTM D638 | ＞8.34 MPa (＞85 kg/cm²) | General strength level for LDPE. | |
| Elongation at Break | ASTM D638 | ＞400 % | Excellent toughness and ductility against large deformation. | |
| Hardness (Shore D) | ASTM D2240 | 44 | Moderate surface scratch‑resistance performance. | |
| Thermal Properties | Vicat Softening Temperature | ASTM D1525 | 82 °C | Heat‑resistance index, pay attention to upper service temperature limit. |
| Brittle Temperature | ASTM D746 | ＜‑62 °C | Outstanding low‑temperature toughness. | |
| Melting Point | ASTM D3417 | 103 °C | Peak melting temperature of resin. | |
| Optical Properties | Transparency | ‑ | ‑ | Good transparency and high surface gloss. |
| Processing Property | Molding Shrinkage Rate | ‑ | 1.0‑3.0 % | Shrinkage range for product design and mold manufacturing reference. |
Injection‑Molding Process Parameters
| Process Parameters | Recommended Range | Remarks & Interpretation |
|---|---|---|
| Drying Treatment | Normally not required | Low‑hygroscopic LDPE for direct use. Dry at 60‑70 ℃ for 1‑2 h under extremely humid storage condition. |
| Barrel Temperature | 160‑250 °C | Temperature rises from rear zone to front zone. Reference setting: rear 160‑170 ℃, middle 180‑200 ℃, front 200‑220 ℃. Start debugging from relatively low temperature for this high‑flow grade. |
| Nozzle Temperature | 180‑200 °C | Slightly lower than front‑zone temperature. |
| Mold Temperature | 10‑60 °C | Low mold temperature 20‑40 ℃ shortens cycle and prevents deformation; higher mold temperature improves gloss replication and reduces internal stress. |
| Injection Pressure | 30‑100 MPa (300‑1000 bar) | High flowability allows medium‑low injection pressure. Excessive pressure causes flash. Holding pressure shall be lower than injection pressure. |
| Injection Speed | Medium‑high speed | Fast injection benefits thin‑wall filling; match with pressure & temperature to avoid flash or gas trapping. |
| Screw Speed | Moderate (50‑100 rpm) | Avoid excessive shear heat. |
| Back Pressure | 0.5‑1.0 MPa | Low back pressure for melt compaction. |
Disclaimer: All above data is for reference only.
