Q: Why do some VIG units fail to meet standard tempered glass fragmentation criteria after breaking?

A: Assessing whether VIG is "properly tempered" based on fragmentation requires strict adherence to national standards, which define specific impact methods, impact points, and inspection areas. Casual or non-standard breakage cannot be used as a benchmark. For instance, when a large, blunt object strikes VIG, long shards often form around the impact point. While the count in this specific area might not meet criteria, the glass’s internal stress levels may actually be fully compliant. If tested according to the standard method using a standardised sharp impact tool, the fragmentation will meet the required safety standards.