For office workers, glass tableware is not easy to change color due to long-term heating, and it is not easy to produce odor. It becomes the choice of more people with rice, but from time to time there is news of explosion due to improper use, heating or collision. According to product experts, glass materials and production processes are different, and the scope of use is also different. It is safer to correctly understand and use glass tableware.
Heat resistant glass withstands rapid thermal shock
According to Huang Dapeng, manager of product training department of Beijing Lekou Lock Trading Co., Ltd., the common glass on the market is roughly divided into three categories: ordinary glass, tempered glass and heat-resistant glass. The common glass components are mainly sodium and calcium. They have no special properties and are often used in early doors and windows. Their greatest advantages are low cost and low price. Tempered glass refers to chemical or physical secondary tempering treatment on the basis of ordinary glass, and the hardness is higher than ordinary glass. After being damaged by force, it is an obtuse-angled granule, which belongs to safety glass and can safely protect personal safety. Therefore, it is widely used, and is often used for indoor glass partitions, outdoor glass curtain walls, and windshields of automobiles. Heat-resistant glass is most widely used in tableware kitchen utensils. It is based on ordinary glass and contains a strong heat-resistant boric acid and silicic acid component, which can withstand rapid temperature difference changes. It is also known as borosilicate. Porous borosilicate glass.
Huang Dapeng said that the glass product of the company's Lock & Lock is used as an example. The temperature range is theoretically between -20 °C and 400 °C, and the temperature difference that can withstand sudden changes in temperature is between 120 °C and 150 °C. This concept can be understood as the glassware has just been taken out of the freezer in the refrigerator (the temperature of the freezer in the freezer is at B15 ° C - -18 ° C), and then directly placed in boiling water (the boiling water temperature is 100 ° C under standard atmospheric pressure), this temperature difference Within 120 ° C, therefore, the heat-resistant glassware will not burst, not only can be refrigerated and frozen, but also used in dishwashers, microwave ovens and electric ovens.
Tempered glass is easy to burst
I often see some news about the explosion of glass tableware on the Internet. What kind of glass will explode? Huang Dapeng said that the probability of explosion of ordinary glass and tempered glass is relatively high. However, it is very rare to use ordinary glass to make cups and dishes, and most of them use tempered glass and heat-resistant glass.
Experts said that tempered glass is prone to explosion, mainly for two reasons: First, the internal stress generated during the production process.
When tempered glass is produced, it is directly cooled in an extremely cold environment after being melted at a high temperature, and a large internal stress is generated in the process of production. In the case of an external force impact, a self-explosion splash occurs. The treatment process after the heat-resistant glass smelting is different from the direct cooling of the tempered glass, but is placed in a slow-cooling furnace for slow cooling, and the internal stress of the glass can be consumed, so that the glass structure is more stable. Although there will be cracks during use, there will be no bursting or flying explosions. Second, the tempered glass contains impurities such as nickel sulfide, which is present inside the glass and affects the stability of the glass structure. Therefore, in daily use, it is not recommended to put ordinary glass and tempered glassware in a microwave oven to easily cause safety hazards.
Safe use before use
Heat-resistant glass can withstand sudden changes in heat and cold, why is there some cracking? Huang Dapeng explained that if the glassware is shaken during normal use, it will have small cracks that cannot be seen by the naked eye, which will affect the stability of the structure. When it is affected by external force, it may cause cracking. Therefore, in order to avoid rupture and other problems during daily use, pay attention to the following:
1. When placed in the freezer of the refrigerator, the volume should not exceed two-thirds of the container; in the closed or semi-closed state of the glassware, avoid liquids such as juice, broth, milk, porridge, etc. Because the volume of food expands after freezing, it can also cause damage to the product.
2. Be sure to open the lid when you put it in the microwave. Although the cover is made of PP material (cold/heat resistant temperature B20°C-120°C), the sealing strip is silicone pad (cold/heat resistant temperature B40°C-200°C), but it is affected by thermal expansion and contraction, which may result in the cover not being able to cover. Problems such as opening or deformation affect the product's tightness.
3. Use steamer carefully, such as steamed fish, steamed egg tarts, etc. The pressure of the steamer easily reacts with the heat-resistant glass to cause fine cracks in the glassware.
4. Avoid using steel balls during cleaning to avoid scratches. Avoid using hard objects such as steel spoons to avoid damage.
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