PYREX® 7740 PROPERTIES - TUBING

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
Temperature Limits
490°C (Extreme Service)
230°C (Normal Service)
Maximum Thermal Shock
160°C

 

Composition (%approx.)
Warnings
SiO2
80.6%
  1. Thick-walled glassware, such as bottles, jars and desiccators, should not be heated over a flame, a hot plate, or other comparable source of heat.
  2. Do not use hydrofluoric or hot phosphoric acid in glass.
  3. Do not use scratched or abraded glassware.
  4. Hot alkali will etch glass.
B2O3
13.0%
Na2O
4.0%
A12O3
2.3%
Miscellaneous Traces
0.1%
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