Borosilicate Glass (Pyrex 7740) vs Fused Silica / Fused Quartz (Type 1)
Property comparison of Borosilicate Glass (Pyrex 7740) and Fused Silica / Fused Quartz (Type 1), both glass.
| Property | Borosilicate Glass (Pyrex 7740) | Fused Silica / Fused Quartz (Type 1) | Difference |
|---|---|---|---|
| Elastic modulus | 64,000 MPa | 73,000 MPa | +14% |
| Shear modulus | 27,000 MPa | 31,000 MPa | +15% |
| Poisson ratio | 0.2 | 0.17 | -15% |
| Density | 2,230 kg/m³ | 2,200 kg/m³ | -1% |
| Thermal conductivity | 1.2 W/m·K | 1.38 W/m·K | +15% |
| Specific heat | 830 J/kg·K | 703 J/kg·K | -15% |
| Coefficient of thermal expansion | 0.000003 1/K | 0.000001 1/K | -83% |
Difference is Fused Silica / Fused Quartz (Type 1) 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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