Glass Code: Corning ^®

7720

Type

Borosilicate

Color

Clear

Principal Use

Electronic

Thermal Expansion

Multiply by
10^-7cm/cm/°C

0 - 300°C.

36. 0

25°C. to setting point

35

Upper Working Temp. for annealed glass (Mechanical considerations only)

Normal service °C.

230

Extreme service °C.

460

Upper Working Temp. for tempered glass (Mechanical considerations only)

Normal service °C

260

Extreme service °C.

260

Thermal Shock Resistance

(15x15cm annealed plates) This data is approx.

3.2mm Thick °C

160

6.4mm Thick °C

130

12.7mm Thick °C

90

Thermal Stress Resistance °C.

49

Viscosity Data

(These data are subject to normal manufacturing variations.)

Strain point °C.

485

Annealing point °C.

525

Softening point °C.

755