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85-platinum 15-iridium vs. Borosilicate Glass

85-platinum 15-iridium and borosilicate glass belong to fundamentally different material chemistries. 85-platinum 15-iridium is a metal, while borosilicate glass is a ceramic material. Therefore, their performance will be even more dissimilar than would be suggested by the difference in properties. There are 12 material properties with values for both materials. Properties with values for just one material (23, 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 85-platinum 15-iridium and the bottom bar is borosilicate glass.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
67 to 80
Poisson's Ratio 0.38
0.21
Tensile Strength: Ultimate (UTS), MPa 560 to 730
280

Thermal Properties

Melting Onset (Solidus), °C 1790
560
Specific Heat Capacity, J/kg-K 130
830
Thermal Expansion, µm/m-K 8.4
3.3 to 5.1

Otherwise Unclassified Properties

Density, g/cm3 22
2.2 to 2.6

Common Calculations

Stiffness to Weight: Axial, points 5.7
15 to 17
Stiffness to Weight: Bending, points 9.3
55 to 61
Strength to Weight: Axial, points 7.1 to 9.3
30 to 35
Strength to Weight: Bending, points 6.9 to 8.3
36 to 43
Thermal Shock Resistance, points 21 to 28
50 to 91