log₁₀(viscosity in ...)

Description

Pa·s

Poise

1

2

Melting Point (glass melt homogenization and fining)

3

4

Working Point (pressing, blowing, gob forming)

4

5

Flow Point

6.6

7.6

Littleton Softening Point (Glass deformes under its own weight. Standard procedures ASTM C338, ISO 7884-3)

8-10

9-11

Dilatometric Softing Point Td, depending on load

10.5

11.5

Deformation Point

11-12.3

12-13.3

Glass Transition Temperature Tg

12

13

Annealing Point (Stress is relieved within a few minutes.)

13.5

14.5

Strain Point (Stress is relieved within several hours.)