Property | Item No. | Unit | POM-C | POM-H | POM-H+PTFE |
1 | Density | g/cm3 | 1.41 | 1.43 | 1.50 |
2 | Water absorption(23℃ in air) | % | 0.20 | 0.20 | 0.17 |
3 | Tensile strength | MPa | 68 | 78 | 55 |
4 | Tensile strain at break | % | 35 | 35 | 10 |
5 | Compressive stress(at 2%nominal strain) | MPa | 35 | 40 | 37 |
6 | Charpy impact strength (unnotched) | KJ/m2 | ≥150 | ≥200 | ≥30 |
7 | Charpy impact strength (notched) | KJ/m2 | 7 | 10 | 3 |
8 | Tensile modulus of elasticity | MPa | 3100 | 3600 | 3200 |
9 | Ball indentation hardness | N2 | 140 | 160 | 140 |
10 | Rockwell hardness | - | M84 | M88 | M84 |