Borosilicate Glass (Pyrex 7740) vs Glass-Ceramic (Macor machinable)
Property comparison of Borosilicate Glass (Pyrex 7740) and Glass-Ceramic (Macor machinable), both glass.
| Property | Borosilicate Glass (Pyrex 7740) | Glass-Ceramic (Macor machinable) | Difference |
|---|---|---|---|
| Elastic modulus | 64,000 MPa | 67,000 MPa | +5% |
| Shear modulus | 27,000 MPa | 25,000 MPa | -7% |
| Poisson ratio | 0.2 | 0.29 | +45% |
| Density | 2,230 kg/m³ | 2,520 kg/m³ | +13% |
| Thermal conductivity | 1.2 W/m·K | 1.46 W/m·K | +22% |
| Specific heat | 830 J/kg·K | 790 J/kg·K | -5% |
| Coefficient of thermal expansion | 0.000003 1/K | 0.000009 1/K | +182% |
Difference is Glass-Ceramic (Macor machinable) relative to Borosilicate Glass (Pyrex 7740). Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- standard
- ASTM
- standard
- ASTM
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