GB/T 38711-2020 in English

Key components of the test device

The laser test system adopts a triangular reflection sensor with a quartz bracket structure, among which:

• Quartz ejector needs to ensure dimensional stability at high temperatures
• Linear bearing friction resistance ≤100mN to avoid measurement interference
• Three-way adjustment platform achieves ±0.05μm positioning accuracy

Implementation suggestions

1. When preparing the sample, ensure that the long side parallelism error is <0.02mm
2. It is recommended to perform benchmark calibration in a constant temperature and humidity laboratory (20±1℃)
3. For high alumina silicate glass, the insulation temperature is recommended to be set to Tg-150℃

Technology evolution analysis

This standard introduces laser ranging technology into glass shrinkage detection for the first time. Compared with traditional thermomechanical analysis (TMA), it has the advantages of non-contact measurement and real-time monitoring. The 2020 version adds the temperature field uniformity verification requirement, reflecting the improvement of the adaptability of flexible glass testing.