Now, the types and scope of application of glass products are getting wider and wider, and some glass products can be directly used as cooking utensils. However, because some consumers do not understand the specific materials and scope of use of glass products, they have been bought and used by mistake, and some glass products have burst and hurt people.
At present, the glassware that consumers often come into contact with in home life mainly includes three categories: ordinary glass, tempered glass and heat-resistant glass. Ordinary glass cannot be used in the use environment of high temperature heating (oven, microwave oven); Tempered glass is an improved product that is tempered by ordinary soda lime glass to improve the mechanical impact resistance, the improvement of its thermal shock resistance is limited; Most of the heat-resistant glass belongs to the borosilicate glass series, but also includes microcrystalline glass and other varieties. Due to the different chemical composition, the structure is also different from ordinary glass or tempered glass, borosilicate glass has a small thermal expansion coefficient, and has good high temperature resistance and temperature resistance. It is suitable for use as a food processing container in the kitchen and can be directly placed in a microwave oven and oven.
Kitchen heat-resistant glass products mainly include heat-resistant tableware, heat-resistant fresh-keeping box utensils and cooking utensils, which can be divided into open fire and dark fire. Heat-resistant glass with ultra-low expansion coefficient, such as microcrystalline glass, has a thermal shock strength of up to 400°C. The above is mainly used for direct open flame heating, cooking and withstanding sharp heating and cooling. Glass products for dark fire have a thermal shock strength of 120 above ℃, it is mainly used for heating and cooking occasions without direct open flame, such as ovens and microwave ovens. It is also a common heat-resistant glass product on the market, such as borosilicate glass. However, at present, the labeling of glass products in the market is not clear, and some operators also mean to confuse the concept and expand the function of ordinary tempered glass and even ordinary glass. Therefore, the China Consumers Association reminds consumers to pay attention:
1. Ordinary glass cannot be used in heating and cooking environments, such as not used in ovens and microwave ovens, tempered glass that is not homogenized, such as in ovens, the use of microwave ovens will cause the risk of self-explosion and injury (currently “homogenized” tempered glass is mainly used for industrial purposes, such as automotive glass, building doors and windows, furniture, etc.).
2. At present, there is no so-called heat-resistant tempered glass products or tempered heat-resistant glass products in the domestic market. Consumers should not be misled when purchasing.
3. Heat-resistant glass products should be affixed with corresponding labels, indicating the use temperature, use range, etc. At present, borosilicate glass is the majority of heat-resistant glass, while microcrystalline glass has heat resistance.
4. Heat-resistant glass products are obtained by annealing and cooling, with good thermal stability, high heat-resistant sudden change temperature, difficult production and high manufacturing cost. If consumers find products with nominal heat-resistant glass but low price when purchasing, they should consider their authenticity.
Post time: Apr-19-2022