| PEEK type | Environment storage status | group code | No. of samples |
| Pure extrusion PEEK | Dry storage | PPEt0 | 10 |
| Pure extrusion PEEK | 1 day storage | PPEt1 | 10 |
| Pure extrusion PEEK | 1 week storage | PPEt2 | 10 |
| Pure extrusion PEEK | 3 weeks storage | PPEt3 | 10 |
| Pure compression PEEK | Dry storage | PPCt0 | 10 |
| Pure compression PEEK | 1 day storage | PPCt1 | 10 |
| Pure compression PEEK | 1 week storage | PPCt2 | 10 |
| Pure compression PEEK | 3 weeks storage | PPCt3 | 10 |
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| Total No. = 80 |