Amid persistent scorching and humid weather, reports of glass spontaneously shattering have emerged nationwide, prompting concerns about structural vulnerabilities under extreme temperatures. According to China National Radio (CNR), a glass installer revealed he has replaced nearly 60 panels in just two months—an average of one per day.
In Zhengzhou, Henan Province, resident Tian discovered his bathroom window’s inner pane had cracked into a spiderweb pattern one morning. Despite the room being air-conditioned at around 27°C, the east-facing window bore the full brunt of direct sunlight. “I didn’t hear any impact,” Tian said, ruling out external force. “The crack originated from the inside, so I suspect the heat was to blame.”
Industry experts explain that glass contains microscopic impurities, and rapid temperature shifts between indoor and outdoor environments can trigger thermal stress, leading to sudden fractures. Such cases typically peak between May and October, with high temperatures exacerbating the indoor-outdoor disparity.
Earlier this month, a bus shelter in Changsha, Hunan Province, also experienced unexplained glass breakage, though no injuries were reported, per local authorities.
The China Meteorological Administration (CMA) noted that over 150 national weather stations recorded temperatures exceeding 40°C since early July, intensifying the strain on glass structures.
