PP Yanshan Petrochemical K7726H
PP Yanshan Petrochemical K7726H Resin
Material Introduction: PP Yanshan Petrochemical K7726H is high‑flow impact‑resistant block‑copolymer injection‑molding grade polypropylene resin. It features good stiffness‑toughness balance, heat resistance and excellent processability for a wide range of applications.
Main Applications
Home appliances: Mainly used for washing machine inner tubs, outer tubs and associated components, also suitable for parts of large‑size and small‑size home appliances.
Automotive industry: For manufacturing auto parts including bumpers, instrument panels and interior trims.
Electrical & electronics: Suitable for selected components in electrical and electronic fields.
Industrial parts & daily‑use articles: Applied for industrial products such as battery housings, as well as daily‑use goods including furniture, toys, toolboxes, travel cases and various packaging containers.
Performance Parameters
| Performance Category | Test Item | Typical Value | Test Condition / Reference Standard | Remarks & Interpretation |
|---|---|---|---|---|
| Physical Properties | Melt Flow Rate(MFR) | 24.0‑35.0 or 26.0 g/10min | 230℃/2.16kg | High‑flow block‑copolymer PP |
| Mechanical Properties | Tensile Yield Strength | ≥23.0 or 25.5 MPa | ‑ | ‑ |
| Flexural Modulus | 1310 MPa | ‑ | ‑ | |
| Izod Notched Impact Strength(23℃) | ≥45 J/m or 12 kJ/m² | ‑ | ‑ | |
| Izod Notched Impact Strength(-20℃) | ≥20 J/m or 4.7 kJ/m² | ‑ | ‑ | |
| Rockwell Hardness | ≥82 R or 100 R | R scale | ‑ | |
| Thermal Properties | Heat‑Distortion Temperature(HDT) | 95‑100 ℃ | 1.82 MPa or 0.45 MPa | ‑ |
| Other Properties | Cleanness | ≤20 pcs/kg | ‑ | ‑ |
| Yellow Index | ≤4 | ‑ | ‑ |
Processing Parameters
| Processing Item | Reference Range | Remarks & Instructions |
|---|---|---|
| Drying Treatment | Normally not required | PP absorbs negligible moisture. Drying is unnecessary under proper storage. Dry at 80‑100 ℃ for 1‑2 h if material gets damp. |
| Barrel Temperature | 200‑280℃ | Zone example: rear zone 160‑180℃；middle zone 180‑210℃；front zone 200‑230℃. Adopt relatively low temperature for high‑flow grade to avoid material degradation. |
| Mold Temperature | 40‑80℃ | Recommended:50‑60℃. Higher mold temperature improves surface gloss, dimensional stability and weld‑line strength; lower mold temperature shortens molding cycle. |
| Injection Pressure | 70‑120 MPa | Adjust according to flow length and part structure. Appropriately reduce injection pressure for high‑flow material. |
| Injection Speed | Medium‑high speed | High‑speed injection helps reduce internal stress, especially for thin‑wall articles. Excessively high speed may trigger surface defects such as gas marks. |
| Holding Pressure & Time | 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 | 0.5‑1.0 MPa | Moderate back‑pressure improves melt homogenization and venting. Not mandatory; too low back‑pressure may cause air entrapment in melt. |
| Screw Speed | 50‑100 rpm | Avoid excessive screw speed to prevent shear‑induced overheating. |
Disclaimer: All above data is for reference only.
