# PMMA vs. PPSU

Both PMMA and PPSU are thermoplastics. There are 24 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is PMMA and the bottom bar is PPSU.

Metric UnitsUS Customary Units

## Mechanical Properties

Compressive (Crushing) Strength, MPa | 120 | |

140 |

Elastic (Young's, Tensile) Modulus, GPa | 3.2 | |

3.6 |

Elongation at Break, % | 4.0 | |

26 |

Flexural Strength, MPa | 110 | |

130 |

Impact Strength: Notched Izod, J/m | 74 | |

80 |

Rockwell M Hardness | 93 | |

84 |

Tensile Strength: Ultimate (UTS), MPa | 71 | |

95 |

## Thermal Properties

Glass Transition Temperature, °C | 110 | |

220 |

Heat Deflection Temperature At 1.82 MPa (264 psi), °C | 96 | |

210 |

Maximum Temperature: Autoignition, °C | 320 | |

580 |

Maximum Temperature: Decomposition, °C | 360 | |

560 |

Specific Heat Capacity, J/kg-K | 1260 | |

970 |

Thermal Conductivity, W/m-K | 0.19 | |

0.24 |

Thermal Expansion, µm/m-K | 76 | |

45 |

## Electrical Properties

Dielectric Constant (Relative Permittivity) At 1 Hz | 3.6 | |

3.8 |

Dielectric Strength (Breakdown Potential), kV/mm | 30 | |

16 |

## Otherwise Unclassified Properties

Density, g/cm^{3} |
1.2 | |

1.4 |

Limiting Oxygen Index (LOI), % | 17 | |

38 |

## Common Calculations

Stiffness to Weight: Axial, points | 1.5 | |

1.4 |

Stiffness to Weight: Bending, points | 42 | |

36 |

Strength to Weight: Axial, points | 17 | |

19 |

Strength to Weight: Bending, points | 32 | |

33 |

Thermal Diffusivity, mm^{2}/s |
0.13 | |

0.17 |

Thermal Shock Resistance, points | 21 | |

42 |