GPPS vs. HIPS
Both GPPS and HIPS are variants of the same material. 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 HIPS.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 2.9 | |
| 1.9 |
| Elongation at Break, % | 1.8 | |
| 40 |
| Flexural Strength, MPa | 80 | |
| 62 |
| Impact Strength: Notched Izod, J/m | 19 | |
| 45 |
| Poisson's Ratio | 0.4 | |
| 0.41 |
| Tensile Strength: Ultimate (UTS), MPa | 44 | |
| 32 |
Thermal Properties
| Glass Transition Temperature, °C | 100 | |
| 100 |
| Maximum Temperature: Autoignition, °C | 360 | |
| 420 |
| Maximum Temperature: Decomposition, °C | 320 | |
| 330 |
| Maximum Temperature: Mechanical, °C | 70 | |
| 70 |
| Specific Heat Capacity, J/kg-K | 1250 | |
| 1400 |
| Thermal Conductivity, W/m-K | 0.14 | |
| 0.22 |
| Thermal Expansion, µm/m-K | 98 | |
| 80 |
| Vicat Softening Temperature, °C | 100 | |
| 110 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 20 | |
| 18 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 15 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.0 | |
| 1.0 |
| Limiting Oxygen Index (LOI), % | 18 | |
| 18 |
| Water Absorption After 24 Hours, % | 0.040 | |
| 0.080 |
Common Calculations
| Stiffness to Weight: Axial, points | 1.5 | |
| 1.0 |
| Stiffness to Weight: Bending, points | 45 | |
| 40 |
| Strength to Weight: Axial, points | 12 | |
| 8.5 |
| Strength to Weight: Bending, points | 26 | |
| 22 |
| Thermal Diffusivity, mm2/s | 0.11 | |
| 0.15 |
| Thermal Shock Resistance, points | 11 | |
| 15 |