PP China Coal Yulin L5E89 Resin
PP China Coal Yulin L5E89 Resin
Material Introduction: PP China Coal Yulin L5E89 is homopolymer polypropylene mainly for flat‑yarn and fiber applications, featuring low melt flow rate and good physical properties.
Main Applications
Woven products: woven bags, tarpaulins, FIBC bulk bags, carpet backing, sofa fabrics, strapping materials, ropes and other articles. Its favorable tensile strength and low elongation are well‑suited for these applications.
Fibers & monofilaments: civil yarns, industrial yarns, carpet yarns.
Injection‑molded products: Though individual suppliers list applications in daily‑use goods, toys and home appliance housings, this grade is optimized for extrusion flat‑yarn processing. It may not be the optimal choice for injection‑molding, especially complex or thin‑wall articles.
Performance Parameters
| Performance Category | Test Item | Typical Value | Test Condition / Reference Standard | Remarks & Interpretation |
|---|---|---|---|---|
| Physical Properties | Melt Mass‑Flow Rate(MFR) | 3.5 g/10min | 230℃/2.16kg, GB/T 3682 | Low‑MFR homopolymer PP for flat‑yarn |
| Isotactic Index | 97.6 % | GB/T 2412 | ‑ | |
| Ash Content | 258 mg/kg | GB/T 9345.1 | ‑ | |
| Yellow Index | ‑0.8 | GB/T 3862 | ‑ | |
| Mechanical Properties | Tensile Yield Strength | 33.6 MPa | GB/T 1040 | ‑ |
| Tensile Breaking Strength | 20.2 MPa | GB/T 1040 | ‑ | |
| Elongation at Break | 204 % | GB/T 1040 | ‑ | |
| Charpy Impact Strength (23℃) | 3.30 kJ/m² | Enterprise test method | ‑ | |
| Other Properties | Cleanness (colored pellets, premium grade) | ≤10 pcs/kg | SH/T 1541 | ‑ |
Processing Parameters
| Processing Item | Reference Range (General PP) | Special Remarks for L5E89 |
|---|---|---|
| Drying Treatment | Normally not required | PP absorbs negligible moisture. Drying is unnecessary under proper storage. Dry at 80 ℃ for 1‑2 h if material gets damp. |
| Barrel Temperature | 180‑280℃ | Homopolymer PP melting point:165‑170℃. For low‑MFR L5E89, adopt medium‑high temperature range (200‑260℃) to ensure sufficient plasticization. |
| Mold Temperature | 20‑70℃ | Recommended:40‑60℃. Higher mold temperature improves surface gloss and dimensional stability; lower mold temperature shortens molding cycle. |
| Injection Pressure | 80‑140 MPa | Adjust based on flow length and part structure. Higher injection pressure may be required since this grade is not optimized for injection‑molding. |
| Injection Speed | Medium speed | Avoid excessive speed to prevent shear‑thermal degradation and surface appearance defects. |
| Holding Pressure | 30%‑60% of injection pressure | Sufficient holding pressure reduces shrinkage and sink marks. Avoid overly long holding time to prevent excessive internal stress. |
| Back Pressure | 5‑20 MPa | Moderate back‑pressure improves melt homogenization and venting. |
| Screw Speed | Medium speed | Adopt medium‑low screw speed to avoid material degradation induced by excessive shear heat. |
Disclaimer: All above data is for reference only.
