GPPS vs. PS
GPPS is a variant of PS. The properties of the parent material encompass the values of all of its variants. There are 25 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is GPPS and the bottom bar is PS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.9 | |
| 1.9 to 2.9 |
| Elongation at Break, % | 1.8 | |
| 1.8 to 40 |
| Flexural Strength, MPa | 80 | |
| 62 to 80 |
| Impact Strength: Notched Izod, J/m | 19 | |
| 19 to 45 |
| Poisson's Ratio | 0.4 | |
| 0.4 to 0.41 |
| Tensile Strength: Ultimate (UTS), MPa | 44 | |
| 32 to 44 |
Thermal Properties
| Glass Transition Temperature, °C | 100 | |
| 100 |
| Maximum Temperature: Autoignition, °C | 360 | |
| 360 to 420 |
| Maximum Temperature: Decomposition, °C | 320 | |
| 320 to 330 |
| Maximum Temperature: Mechanical, °C | 70 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1250 | |
| 1250 to 1400 |
| Thermal Conductivity, W/m-K | 0.14 | |
| 0.14 to 0.22 |
| Thermal Expansion, µm/m-K | 98 | |
| 80 to 98 |
| Vicat Softening Temperature, °C | 100 | |
| 100 to 110 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 20 | |
| 18 to 20 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 15 | |
| 14 to 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 18 | |
| 18 |
| Water Absorption After 24 Hours, % | 0.040 | |
| 0.040 to 0.080 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 | |
| 1.0 to 1.5 |
| Stiffness to Weight: Bending, points | 45 | |
| 40 to 45 |
| Strength to Weight: Axial, points | 12 | |
| 8.5 to 12 |
| Strength to Weight: Bending, points | 26 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 0.11 | |
| 0.11 to 0.15 |
| Thermal Shock Resistance, points | 11 | |
| 11 to 15 |