How to ensure the safety of Sandwich glass

Sandwich glass can ensure safety in multiple aspects, as follows:
1. The bonding effect of the intermediate film
      Principle: Sandwich glass is sandwiched with one or more layers of polymer intermediate film, commonly PVB (polyvinyl butyral). When glass is impacted by external forces, even if the outer layer of glass breaks, the middle film can rely on strong bonding force to tightly adhere the broken glass fragments together, preventing them from splashing and injuring people. For example, in a traffic accident, after the windshield of a car is hit and broken, the glass shards still adhere to the PVB film, and passengers inside the car will not be scratched by sharp flying fragments.
      Standard: Qualified sandwich glass products, in accordance with relevant standards such as the national standard GB 15763.3-2009, must undergo a drop ball impact peeling test to test the effectiveness of the intermediate film bonding glass fragments and ensure the integrity of the glass after breakage.
2. Stacking of multi-layer glass structures
      Principle: Some good sandwich glass adopts a structure of multi-layer glass and multi-layer intermediate film composite. The stacking of multiple layers of glass disperses the external impact force, making it difficult for the force to concentrate and penetrate the glass, just like a relay to resist external forces, with each layer of glass sharing a portion of the energy.
      Standard: The industry will simulate different intensity impact scenarios, such as simulating strong winds carrying foreign objects and impacting high-rise curtain wall glass. Impact tests will be conducted from different heights and angles. Only when the impact resistance performance of the multi-layer glass structure meets the standard can the product enter the market.
3. Strict production process control
      Raw material quality: When producing sandwich  glass, all raw materials from glass sheets to intermediate films must undergo strict screening. Glass original sheets should not have obvious defects such as bubbles or stones, otherwise they will become weak points under stress; The thickness and uniformity of the intermediate film also need to be controlled correctly, as uneven thickness may lead to uneven bonding effects.
      Processing step: The sandwich process must be operated in a dust-free, constant temperature, and constant humidity environment to avoid dust and impurities from entering the interlayer and affecting the bonding. Afterwards, after high-temperature and high-pressure treatment in an autoclave, the intermediate film and glass are fully fused, improving overall strength. Any deviation in process parameters may reduce the performance of the glass, so there is precise monitoring and control throughout the process.
4. System security performance testing
      Impact resistance test: Simulate various daily impact scenarios, use steel balls of different qualities to freely fall from a specific height and hit the glass, detect whether the glass is broken, fragmented, and whether there is penetration. sandwich glass used in buildings must meet the standard of withstanding certain energy impacts before it can be used for high-rise exterior windows, curtain walls, and other areas.
      Environmental resistance test: sandwich glass needs to undergo simulated high and low temperature cycles, long-term exposure to ultraviolet radiation, humidity changes, and other aging tests to test whether the bonding between the glass and the intermediate film is stable and whether various properties have deteriorated under different environments, ensuring the safety of long-term service.