Is the glass easy to explode？
Yes, the inner wall of the glass is heated and expanded, causing the glass to burst. The problem does not appear in the quality of the cup, but because the glass is a poor conductor of heat. It is used in an environment with low temperature in winter. After the hot water is poured into the glass, the inner wall of the glass is heated and expanded, and the outer wall of the glass is thermally expanded. The slow heat cannot keep up with the expansion speed of the inner wall, and uneven heating causes the cup to burst.
The Defective Product Management Center of the General Administration of Quality Supervision, Inspection and Quarantine issued an early warning for the consumption of glass drinking utensils. It pointed out that in recent years, there have been frequent injuries caused by glass drinking utensils. It reminds everyone to choose the wrong glass or improper usage when drinking hot water, which may cause the glass to burst. Burns, scratches, etc.
The hot drink cup must withstand a temperature difference above 50℃, and it may burst when it is hot or cold. When using glass water utensils and tableware, pay special attention to the temperature difference resistance of the product. "The bursting of glass cups, etc., mostly occurs when the temperature is hot and cold. Even heat-resistant glass may burst if the temperature difference is too large."
At present, in the industry standard of "Glasses" (QB/T4162-2011), there is a requirement of "thermal shock resistance" for glasses that can hold hot drinks, and it is clear that such glasses must be able to withstand a temperature difference of more than 50°C. rupture. "Many people have the habit of'cold' cups of hot water, and buy the cups and use them without reading the instructions. This is risky."
The official website of the General Administration of Quality Supervision, Inspection and Quarantine released the information "Bow and Arrow Glassware (China) Co., Ltd. Recalls Some Glass Water Sets". The reason is that "the safety warning label on the outer packaging of the product is not clearly printed. , When the temperature difference between the water glass and the water exceeds 60°C at the moment of use, the product may be broken and there is a safety hazard of burns."