PP 对比 PE Case
PP (polypropylene) and PE (polyethylene) are both common case materials. PP is harder, more rigid, used for cases. PE is softer, more flexible, used for bags and liners. Both are food-safe, recyclable, and cost-effective.本文从材质、成本、应用场景等维度进行全面对比。
详细对比
| 方面 | Option A | Option B |
|---|---|---|
| Density | 0.91 g/cm³ | 0.92-0.96 g/cm³ |
| Tensile strength | 30-40 MPa | 20-30 MPa |
| Hardness (Shore D) | 70-80 | 50-65 |
| Heat deflection | 100°C | 65-80°C |
| Chemical resistance | Excellent | Good |
| Recycling code | 5 | 4 (LDPE) or 2 (HDPE) |
| Cost | Lower | Higher |
| Best for | Cases, rigid packaging | Bags, liners, flexible packaging |
结论
Choose PP for: cases, rigid packaging, higher temperature. Choose PE for: bags, liners, flexible packaging, lower temperature. For cases, PP is standard. For inner liners, PE is common.根据具体需求选择合适的方案。
Are PP and PE the same??
No. PP and PE are different polymers with different properties. PP is harder, more rigid, used for cases. PE is softer, used for bags and films. Both are recyclable but with different codes (5 vs 2/4).