TABLE OF CONTENTS The mechanical properties of polymeric materials differ substantially in each formulation. The viscoelastic nature of plastics dominates their mechanical properties. It also influences the test procedures by which those properties are evaluated.
Table 2.1 compares the ASTM mechanical properties of the most common generic thermoplastic materials (US units are listed first, then SI units). Table 2.2 compares the same properties (US and SI units) of thermoset materials. Table 2.3 compares the properties (US and SI units) of thermoplastic elastomer resins.
| Thermoplastic Resins | Tensile Strength (kpsi) | Elongation at Break (%) | Tensile Modulus (kpsi) | Flexural Stress (kpsi) | Compressive Stress (kpsi) | Shear Strength (kpsi) | Izod Impact Notch (ft-lb/in) |
|---|---|---|---|---|---|---|---|
| ABS - Unfilled | 6.80 |
| 350 | 12.00 |
|
| 6.00 |
| ABS - High Impact | 6.30 |
| 320 | 10.50 |
|
| 7.00 |
| ABS - Plateable Grade | 6.40 |
| 380 | 11.60 |
|
| 5.00 |
| ABS - 20% GR | 12.00 |
| 660 | 15.00 |
|
| 1.40 |
| ABS - 30% GR | 14.00 |
| 1,000 | 17.60 |
|
| 1.20 |
| Acetal Homo Medium Flow | 10.00 | 40 | 450 | 14.10 | 18.00 | 9.50 | 1.50 |
| Acetal Homo - High Flow | 9.90 | 17 | 450 |
| 15.30 | 8.50 | 1.10 |
| Acetal Homo- Tough-Med Flow | 8.40 | 60 | 350 | 10.00 | 11.80 | 6.40 | 2.50 |
| Acetal Homo- 20% PTFE | 6.90 | 15 | 350 | 10.30 | 13.00 | 8.00 | 1.00 |
| Acetal Copolymer - Med Flow | 8.80 | 60 | 410 | 13.00 | 16.00 | 7.70 | 1.40 |
| Acetal Copolymer - 25% GR | 18.50 | 3.00 | 1,250 | 28.00 | 17.00 | 13.00 | 1.80 |
| Acrylic - Unfilled | 9.50 | 3.00 5.00 |
