FDM PAHT-CF vs. Silicon

Compare FDM PAHT-CF vs. Silicon strength, stiffness, weight and thermal properties.

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SiliconGrown single crystal

Mechanical
Try it on a partA sample part to run stress or thermal on, free in your browser	Open in LessCAD	Open in LessCAD
Yield strength	not given (tensile used)	not given (tensile used)
Ultimate tensile strength	92MPasourcetypical	130MPasourcemodulus of rupture (bending fracture stress); brittle, no yield point
Flexural strength	125MPasourcetypical	130MPasourcemodulus of rupture
Elongation at break	8.4%sourcetypical	not sourced
Young's modulus (stiffness)	3.86GPasourcetypical	131GPasourcetypical (single quoted value of an anisotropic crystal)
Density	1,060kg/m³sourcetypical2.2x lighter	2,329kg/m³sourcetypical
Strength to weight	86.8kN·m/kg1.55x higher	55.8kN·m/kg
Stiffness to weight	3.64MN·m/kg	56.2MN·m/kg15.4x higher
Poisson's ratio	not sourced	0.221sourcetypical
Shear modulus	not sourced	53.6GPa
Bulk modulus	not sourced	78.3GPa
Speed of sound	1,908m/s	7,500m/s
Thermal
Thermal conductivity	not sourced	163W/m·Ksourcetypical at 313 K (40 °C)
Thermal expansion	not sourced	2.62µm/m·Ksourcetypical at 300 K
100 mm part over a 50 °C swing	not sourced	13.1µm growth
Specific heat	not sourced	732J/kg·Ksourcetypical
Heats up and cools (diffusivity)	not sourced	95.6mm²/s
Thermal shock resistance	not sourced	48,095W/m
Melting point	225°Csourcetypical	1,412°Csourcetypical
Glass transition	70°Csourcetypical	not sourced
Max service temperature	170°CsourceHDT 1.8 MPa	300°Csourceproducer's maximum application temperature (optical components)
Values for	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.	Synthetic single-crystal silicon (cubic, diamond structure), Korth Kristalle (crystal grower) material data; Korth usually supplies Floating Zone (FZ) material, Czochralski (Cz) also offered. Silicon is elastically anisotropic; the producer quotes one modulus and the solver is isotropic.

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 FDM PAHT-CF stronger than Silicon?

Silicon is stronger: its tensile strength is 130 MPa against 92 MPa for FDM PAHT-CF (41%).

Which is lighter, FDM PAHT-CF or Silicon?

FDM PAHT-CF is lighter: 1,060 kg/m³ against 2,329 kg/m³ for Silicon.

Which is stiffer, FDM PAHT-CF or Silicon?

Silicon is stiffer: Young's modulus 131 GPa against 3.86 GPa for FDM PAHT-CF, so the same part in Silicon deflects less under the same load.

Which is lighter for the same job, FDM PAHT-CF or Silicon?

For the same stiffness or strength: FDM PAHT-CF is lighter for a strong rod or tie, strong beam, strong panel or plate; Silicon is lighter for a stiff rod or tie (tension), stiff beam (bending), stiff panel or plate.

Part that must be	FDM PAHT-CF	Silicon
Stiff rod or tie (tension)	15.4x heavier	lighter
Stiff beam (bending)	2.65x heavier	lighter
Stiff panel or plate	47% heavier	lighter
Strong rod or tie	lighter	1.55x heavier
Strong beam	lighter	1.74x heavier
Strong panel or plate	lighter	1.85x heavier

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).

Among 72 materials

Stiffness against density

Strength against density