Spruce-pine-fir vs. PS
Spruce-pine-fir belongs to the wood-based materials classification, while PS belongs to the thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is spruce-pine-fir and the bottom bar is PS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 16 | |
| 1.9 to 2.9 |
| Elongation at Break, % | 1.5 | |
| 1.8 to 40 |
| Poisson's Ratio | 0.38 | |
| 0.4 to 0.41 |
| Tensile Strength: Ultimate (UTS), MPa | 85 | |
| 32 to 44 |
Thermal Properties
| Maximum Temperature: Mechanical, °C | 130 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1380 | |
| 1250 to 1400 |
| Thermal Conductivity, W/m-K | 0.12 | |
| 0.14 to 0.22 |
| Thermal Expansion, µm/m-K | 6.5 | |
| 80 to 98 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 0.5 | |
| 18 to 20 |
Otherwise Unclassified Properties
| Density, g/cm3 | 0.5 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 24 | |
| 18 |
Common Calculations
| Stiffness to Weight: Axial, points | 18 | |
| 1.0 to 1.5 |
| Strength to Weight: Axial, points | 47 | |
| 8.5 to 12 |
| Strength to Weight: Bending, points | 86 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 0.17 | |
| 0.11 to 0.15 |
| Thermal Shock Resistance, points | 58 | |
| 11 to 15 |