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
L_b	200 mm
L_S	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).