Materials / Compare
Glass vs. FDM PAHT-CF
Compare Glass vs. FDM PAHT-CF strength, stiffness, weight and thermal properties.
| Try it on a partA sample part to run stress or thermal on, free in your browser | Open in LessCAD | Open in LessCAD |
|---|---|---|
| Mechanical | ||
| Yield strength | not given (tensile used) | not given (tensile used) |
| Ultimate tensile strength | 41MPasourcetypical mean surface tensile stress at fracture (MOR), 60 s load, weathered, 50% breakage probability | 92MPasourcetypical |
| Flexural strength | 41MPasourcemean MOR (same value as tensile) | 125MPasourcetypical |
| Elongation at break | not sourced | 8.4%sourcetypical |
| Young's modulus (stiffness) | 72GPasourcetypical18.7x stiffer | 3.86GPasourcetypical |
| Density | 2,500kg/m³sourcetypical | 1,060kg/m³sourcetypical2.36x lighter |
| Strength to weight | 16.4kN·m/kg | 86.8kN·m/kg5.29x higher |
| Stiffness to weight | 28.8MN·m/kg7.91x higher | 3.64MN·m/kg |
| Poisson's ratio | 0.22sourcetypical | not sourced |
| Shear modulus | 29.5GPa | not sourced |
| Bulk modulus | 42.9GPa | not sourced |
| Speed of sound | 5,367m/s | 1,908m/s |
| Thermal | ||
| Thermal conductivity | 0.937W/m·Ksourcetypical at 75 F | not sourced |
| Thermal expansion | 8.3µm/m·Ksourcetypical, 75-575 F | not sourced |
| 100 mm part over a 50 °C swing | 41.5µm growth | not sourced |
| Specific heat | 880J/kg·Ksourcetypical at 75 F | not sourced |
| Heats up and cools (diffusivity) | 0.426mm²/s | not sourced |
| Thermal shock resistance | 50.1W/m | not sourced |
| Melting point | not sourced | 225°Csourcetypical |
| Glass transition | not sourced | 70°Csourcetypical |
| Max service temperature | 511°Csourcestrain point (ASTM C336) - stress-relaxation onset, not a rated service limit | 170°CsourceHDT 1.8 MPa |
| Values for | Annealed soda-lime-silica float glass, Pilkington North America Technical Bulletin ATS-129 (04/2025) | Bambu Lab PAHT-CF, TDS V3.0, printed specimens X-Y, dry state; nozzle 290 °C, bed 100 °C, 100 mm/s, 100% infill; annealed and dried 80 °C for 12 h before testing. |
Every value links to the document that states it. "Not sourced" means no citable source states it (or only a specification minimum); figures computed from it are left out too.
FDM PAHT-CF is 3D printed: its properties depend on build direction and print settings; these are typical values.
Questions
Is Glass stronger than FDM PAHT-CF?
FDM PAHT-CF is stronger: its tensile strength is 92 MPa against 41 MPa for Glass (2.24x).
Which is lighter, Glass or FDM PAHT-CF?
FDM PAHT-CF is lighter: 1,060 kg/m³ against 2,500 kg/m³ for Glass.
Which is stiffer, Glass or FDM PAHT-CF?
Glass is stiffer: Young's modulus 72 GPa against 3.86 GPa for FDM PAHT-CF, so the same part in Glass deflects less under the same load.
Which is lighter for the same job, Glass or FDM PAHT-CF?
For the same stiffness or strength: Glass is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate; FDM PAHT-CF is lighter for a strong rod or tie, strong beam, strong panel or plate.
| Part that must be | Glass | FDM PAHT-CF |
|---|---|---|
| Stiff rod or tie (tension) | lighter | 7.91x heavier |
| Stiff beam (bending) | lighter | 1.83x heavier |
| Stiff panel or plate | lighter | 12% heavier |
| Strong rod or tie | 5.29x heavier | lighter |
| Strong beam | 4.04x heavier | lighter |
| Strong panel or plate | 3.53x heavier | lighter |
For the same stiffness or strength, mass scales with density over stiffness (or strength) raised to a power set by how the part is loaded: 1 for a rod in tension, 1/2 for a beam in bending, 1/3 for a panel (the standard material-selection indices).