PAR vs. Thermoset PI
PAR belongs to the thermoplastics classification, while thermoset PI belongs to the thermoset plastics. There are 20 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 PAR and the bottom bar is thermoset PI.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 93 | |
| 120 to 210 |
| Elongation at Break, % | 50 | |
| 2.0 to 5.9 |
| Flexural Modulus, GPa | 2.1 | |
| 3.1 to 4.8 |
| Flexural Strength, MPa | 75 | |
| 60 to 100 |
| Impact Strength: Notched Izod, J/m | 220 | |
| 21 to 43 |
| Tensile Strength: Ultimate (UTS), MPa | 67 | |
| 37 to 81 |
Thermal Properties
| Glass Transition Temperature, °C | 190 | |
| 360 |
| Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 170 | |
| 370 |
| Maximum Temperature: Decomposition, °C | 470 | |
| 330 |
| Specific Heat Capacity, J/kg-K | 1200 | |
| 1130 |
| Thermal Conductivity, W/m-K | 0.18 | |
| 0.29 to 1.7 |
| Thermal Expansion, µm/m-K | 88 | |
| 38 to 54 |
Electrical Properties
| Dielectric Strength (Breakdown Potential), kV/mm | 16 | |
| 20 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 12 | |
| 15 |
Otherwise Unclassified Properties
| Density, g/cm3 | 1.2 | |
| 1.4 to 1.6 |
| Limiting Oxygen Index (LOI), % | 35 | |
| 40 |
| Water Absorption After 24 Hours, % | 0.26 | |
| 0.14 to 0.24 |
Common Calculations
| Strength to Weight: Axial, points | 16 | |
| 6.5 to 16 |
| Strength to Weight: Bending, points | 31 | |
| 16 to 30 |
| Thermal Diffusivity, mm2/s | 0.13 | |
| 0.18 to 0.95 |