Thermoplastic comparison
PETG (glycol-modified PET) vs Acrylic (PMMA)
Every value below is a typical room-temperature figure with its source, test method and conditions — the same dataset that drives the calculators.
| Property | PETG (glycol-modified PET) | Acrylic (PMMA) | Difference |
|---|---|---|---|
| Density | 1.3 g/cm³ | 1.19 g/cm³ | PETG (glycol-modified PET) — 9% higher |
| Young's modulus E | 2.2 GPa | 3.1 GPa | Acrylic (PMMA) — 41% higher |
| Tensile strength | 53 MPa | 72 MPa | Acrylic (PMMA) — 36% higher |
| Glass transition Tg | 81 °C | 105 °C | Acrylic (PMMA) — 24 °C higher |
Where these numbers come from
- MakeItFrom.com materials database — typical grade values
- Callister & Rethwisch, Materials Science and Engineering, 10th ed.
Typical room-temperature values for learning and preliminary design; grades vary widely and a supplier datasheet always overrides a textbook figure. Confirm against the datasheet before design work.