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Pyrex® 7740
Glass Type: Borosilicate
Description
Pyrex® 7740 is Corning's trade name borosilicate glass. It has a low coefficient of thermal expansion and good heat shock resistance. Pyrex® can be used as a substitute for Schott Borofloat® in most cases. SGP can CNC mill, drill, cut, lap, and polish Pyrex® to any dimension, shape or surface finish.
| Thermal Properties |
| Thermal Coefficient of Expansion |
(0/300°C): 32.5 X 10 -7/°C |
| Annealing Point |
560°C / 1040°F |
| Softening Point |
821°C / 1509.8°F |
| Strain Point |
510°C / 950° F |
| Mechanical Properties |
| Density |
2.23 g/cm3 (at 20°C / 68°F) |
| Knoop Hardness |
448 kg/mm2 |
| Young's Modulus |
64 Gpa |
| Poisson's Ratio |
0.20 |
| Chemical Properties |
| Hydrolytic Resistance |
class1 |
| Acid Resistance |
class 1 |
| Alkali Resistance |
class 2 |
| Electrical Properties |
| Dielectric Constant |
E=4.6 1 MHz @R.T. |
| Resistivity |
8 X 1010 ohm/cm @R.T. |
| Dielectric Strength |
0.5 KV/mm | |
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