Stress Test Results of Heat-Strengthened Glass, Tempered Glass & High-Stress Fire-Resistant Glass

1. Overview of Stress Tests

We conducted detailed tests on two key stress indicators of three glass types: surface compressive stress and internal tensile stress. The tested glass includes:

• Heat-strengthened glass

• Tempered glass

• High-stress fire-resistant glass

2. Testing Instrument

SCALP-05 Scattered Light Polariscope: 

A compact scattered light polariscope for depth-wise stress measurement in sheet glass.

3. Stress Test Results by Glass Type

3.1 Heat-Strengthened Glass

Specific test results are as follows:

• Surface compressive stress value: 35.4MPa

3.2 Tempered Glass

Specific test results are as follows:

• Surface compressive stress value: 104.2MPa

3.3 High-Stress Fire-Resistant Glass

Specific test results are as follows:

• Surface stress value: 174.6MPa

4. Stress Curve Analysis

For the stress distribution curve of the tested glass:

• Abscissa: Represents the thickness direction of the glass (i.e., the depth from the glass surface to the center).

• Ordinate: Represents the stress value (unit: MPa).

• Stress value definition:

• Negative values = Compressive stress area (mainly distributed on the glass surface).

• Positive values = Central tensile stress (mainly distributed in the glass core).