Pyrex® 7740 is a low expansion borosilicate glass. We carry many different forms of Pyrex® glass: Tubing, Rods, Flat Polished and Rolled Sheet Glass, Jars, Cylinders, Annular Edge Sight Glass, Tubular Gage Glass, IRR Coated and more. Pyrex® glass is good for normal use temperature of 446 °F and maximum use temperature 914 °F. Pyrex® can be tempered to increase its mechanical strength. The flat polished sheets are used for sight glasses, windows, etc. The flat rolled sheets in the thinner sizes are fine for non critical window, fireplace, lighting applications, while the thicker sheets are used for blanks to be ground and polished or in architectural applications where its high resistance to weathering, acids and the surface rolled look is desired.
Corning Pyrex® 7740 Properties | Heavy Wall | Medium Wall | Standard Wall
| Corning Pyrex® 7740 Properties | ||
|---|---|---|
| Glass Code: Corning Pyrex® | 7740 |
|
| Type | Borosilicate |
|
| Color | Clear |
|
| Principal Use | General Lab Ware |
|
Thermal Expansion Multiply by 10-7cm/cm/°C |
0 - 300°C |
32.5 |
25°C to Setting Point |
35 |
|
Upper Working Tempature for Annealed Glass (Mechanical Considerations Only) |
Normal Service °C |
230 |
Extreme Service °C |
490 |
|
Upper Working Tempature for Tempered Glass (Mechanical Considerations Only) |
Normal Service °C |
260 |
Extreme Service °C |
290 |
|
Thermal Shock Resistance (15 x 15cm Annealed Plates) This data is Approximately. |
3.2mm Thick °C |
160 |
6.4mm Thick °C |
130 |
|
12.7mm Thick °C |
90 |
|
| Thermal Stress Resistance °C | 54 |
|
Viscosity Data (This data is subject to normal manufacturing variations.) |
Strain Point °C |
510 |
Annealing Point °C |
560 |
|
Softening Point °C |
821 |
|
Working Point °C |
1252 |
|
| Density q/cm3 | 2.23 |
|
| Young's Modulus (Multiply by 103Kg/mm2) | 6.4 |
|
| Poisson's Ratio | .20 |
|
| Log10 of Volume Resistivity ohm/cm | 25°C |
15.0 |
250°C |
8.1 |
|
350°C |
6.6 |
|
Dielectric Properties (1 MHz 20°C) |
Power Factor % |
0.50 |
Dielectric Constant |
4.6/td> |
|
Loss Factor % |
2.6 |
|
| Refractive Index | 1.474 |
|
| Stress-Optical Coefficient (nm/cm) / (Kg/mm2) | 394 |
|