Common physical properties of flexible packaging material
| Barrier properties | strength | function | ||||||||||
| Water and gas | oxygen | general | Stiff | Hypothermia | high temperature | Transparent | forming | Sealing | Paul Shannon | |||
| paper | × | × | 〇 | ◎ | ◎ | ◎ | × | × | × | ×◎ | × | |
| metal | AL | ◎ | ◎ | × | × | ◎ | ◎ | × | 〇 | × | ◎ | ◎ |
| film | OPP | 〇 | × | ◎ | ◎ | △ | △ | ◎ | × | US | ◎ | × |
| CPP | 〇 | × | 〇 | 〇 | × | △ | ◎ | ◎ | ◎ | 〇 | × | |
| PET | 〇 | 〇 | ◎ | ◎ | ◎ | ◎ | ◎ | × | × | ◎ | ◎ | |
| ONY | △ | 〇 | ◎ | 〇 | ◎ | ◎ | ◎ | × | × | 〇 | 〇 | |
| CNY | × | △ | ◎ | △ | 〇 | ◎ | 〇 | ◎ | × | △ | 〇 | |
| LDPE | 〇 | × | △ | ×△ | 〇 | × | 〇 | ◎ | ◎ | △ | × | |
| HDPE | 〇 | × | 〇 | △〇 | 〇 | △ | △ | 〇 | 〇 | △ | × | |
| PVDC | ◎ | ◎ | ◎ | × | 〇 | 〇 | ◎ | ×〇 | W | 〇 | × | |
| PVC | 〇 | × | 〇 | △ | 〇 | △ | ◎ | ◎ | W | 〇 | 〇 | |
| PVA | × | ◎ | ◎ | 〇 | 〇 | 〇 | ◎ | 〇 | × | △ | 〇 | |
| EVOH | × | ◎ | ◎ | 〇 | 〇 | △ | ◎ | 〇 | × | △ | 〇 | |
| OPS | △ | × | ◎ | ◎ | 〇 | 〇 | ◎ | ◎ | 〇 | 〇 | × | |
| PVDC | KOP | ◎ | ◎ | ◎ | ◎ | △ | △ | ◎ | × | 〇 | ◎ | 〇 |
| Coating | KPET | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | ◎ | × | 〇 | ◎ | ◎ |
◎：excellent 〇：good△：general×：badUS：Ultrasonic SutureW：High Frequency Sealing