4-point bending test: Determination of bending strength of glass DIN EN 1288-3

Photos of the delivered testing machine and equipment

Inserting a new pane of glass
4-point bending test to test the bending strength of safety glass
The broken glass is collected in a tub
Testing of samples with two-sided support (four-edge method)

Determination of the Bending Strength of Glass

Part 3: Testing of specimens with two-sided support

(four-edge method or 4-point bending test)

1

Sample

2

bending rolls / bending mandrels

3

support rollers / supports

4

rubber interlayer

h

sample thickness

Lb

200 mm

LS

1 mm

After hardening, a safety glass pane is tempered using a universal testing machine GALDABINI Quasar 50 kN. The glass pane is bent on a 4-point bending device until it bursts in order to determine the remaining toughness. If the hardening is too high, the pane will break prematurely (through hardening / too little residual toughness). The load is applied as the rate of stress increase (force / sample cross-section).

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