# Fused Silica vs. Titanium Diboride

Fused silica belongs to the glass and glass-ceramics classification, while titanium diboride belongs to the non-oxide engineering ceramics. There are 18 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is fused silica and the bottom bar is titanium diboride.

Metric UnitsUS Customary Units

## Mechanical Properties

Compressive (Crushing) Strength, MPa | 1100 | |

3540 |

Elastic (Young's, Tensile) Modulus, GPa | 73 | |

290 |

Flexural Strength, MPa | 67 | |

380 |

Knoop Hardness | 570 | |

2800 |

Poisson's Ratio | 0.17 | |

0.11 |

Tensile Strength: Ultimate (UTS), MPa | 50 | |

280 |

## Thermal Properties

Maximum Temperature: Mechanical, °C | 1080 | |

1270 |

Specific Heat Capacity, J/kg-K | 720 | |

870 |

Thermal Conductivity, W/m-K | 1.4 | |

58 |

Thermal Expansion, µm/m-K | 0.5 | |

8.0 |

## Electrical Properties

Electrical Resistivity Order of Magnitude, 10^{x} Ω-m |
14 | |

-6.5 |

## Otherwise Unclassified Properties

Density, g/cm^{3} |
2.2 | |

4.5 |

## Common Calculations

Stiffness to Weight: Axial, points | 18 | |

35 |

Stiffness to Weight: Bending, points | 63 | |

49 |

Strength to Weight: Axial, points | 6.3 | |

17 |

Strength to Weight: Bending, points | 14 | |

21 |

Thermal Diffusivity, mm^{2}/s |
0.85 | |

15 |

Thermal Shock Resistance, points | 97 | |

8.7 |