Glassware used in the hottest kitchen should be ca

Glassware used in kitchen should be careful to see the material. Don't buy or use it by mistake.

glass products have the advantages of transparency, easy cleaning, firmness and good corrosion resistance. More and more people use them as daily necessities and food containers, and they are loved by the majority of consumers. With the progress of glass making technology and process, the variety and scope of application of glass products are becoming wider and wider. Some glass products have been regarded as new expensive glass products in the field of e-commerce and can be directly used as cooking utensils. At the same time, some consumers bought and used glass products by mistake because they didn't know the specific material and scope of use of glass products, and the glass burst and hurt people

at present, the glassware that consumers often contact in home life mainly includes ordinary glass, tempered glass and heat-resistant glass. Most consumers know that ordinary glass cannot be used in the use environment of high-temperature heating (oven, microwave oven), but many consumers do not understand the difference between tempered glass and heat-resistant glass, and mistakenly use tempered glass containers for cooking purposes, As a result, people were injured after the explosion of tempered glassware. Toughened glass is an improved product that improves the mechanical impact resistance of ordinary soda lime glass after toughening, and its thermal impact resistance is limited. Heat resistant glass mostly belongs to borosilicate glass series, including microcrystalline glass and other varieties. Due to different chemical composition, the structure is also different from ordinary glass or tempered glass. The coefficient of thermal expansion of borosilicate glass is small, and it has good characteristics of high temperature resistance and resistance to temperature rapid cooling and heat change. It is suitable to be used as a food processing container in the kitchen, and can be directly put into the microwave oven and oven. Kitchen heat-resistant glass products mainly include heat-resistant tableware, heat-resistant fresh-keeping box containers and cooking utensils, which can be divided into open fire and dark fire. Heat resistant glass with ultra-low coefficient of expansion, such as glass ceramics, has a thermal shock strength of more than 400 ℃. It is mainly used for direct open fire heating, cooking and the occasions that bear sharp heating and cooling. Dark exergy glass products, with a thermal shock strength of more than 120 ℃, are mainly used in heating and cooking occasions without direct open fire, such as ovens and microwave ovens. They are also the most common heat-resistant glass products in the market, such as borosilicate glass

after the investigation of the China Consumer Association, there have been many reports of injuries caused by the self explosion of tempered glass in the media at home and abroad. Japan and other countries have clearly stipulated that tempered glass cannot be used in microwave ovens and ovens. With the changes of Chinese consumers' dietary structure and cooking methods, consumers have begun to accept glass cookers, and the number is increasing rapidly. However, at present, the labeling of glass products in the market is not clear, and some operators deliberately confuse the concept, expanding the functions of ordinary tempered glass and even ordinary glass, making it very easy for consumers to buy and misuse. Here, the China Consumer Association reminds consumers to pay attention to:

first, ordinary glass cannot be used in heating and cooking environments. For example, it cannot be used in ovens and microwave ovens. Tempered glass that has not been homogenized, such as being used in ovens and microwave ovens, has the risk of self explosion and personal injury (at present, the "homogenized" tempered glass is mainly used for industrial purposes, such as automotive glass, building doors and windows, furniture accessories, etc.)

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

III. heat resistant glass products should be pasted with corresponding signs, indicating the use temperature, scope of use, etc. consumers should pay attention to the above information when purchasing and using. At present, among the heat-resistant glasses, borosilicate glass is in the majority, while microcrystalline glass has the best heat-resistant performance

IV. heat resistant glass products are obtained by annealing and cooling. They have good thermal stability, high heat-resistant sudden change temperature, high production difficulty and high manufacturing cost. When shopping, consumers should consider the authenticity of products with nominal heat-resistant glass but low price

in addition, glass cooking utensils (tableware) production and operation enterprises also have the obligation to make clear the product material, use environment and safety precautions. It is also necessary for the corresponding household appliance production and operation enterprises such as ovens and microwave ovens to indicate the specific functional requirements and scope of use of the supporting heating containers in the operation manual. Catering enterprises should also provide consumers with glassware that meets safety requirements

background:

reasons for self explosion of tempered glass

the reason why tempered glass is easy to self explode is that during the manufacturing process, it often becomes mixed with nickel sulfide composition (NIS) that cannot be found by the naked eye. This nickel sulfide will cause the tempered glass to expand greatly unmatched with the glass under the change of ambient temperature, that is, breaking the balance between many stresses in the glass, and the glass may crack, Green packaging should be vigorously developed to cause the phenomenon of glass self exploding flyer. Flat tempered glass has strong mechanical impact resistance, but special-shaped utensils such as cooking utensils (tableware) have high self explosion rate and poor safety due to their complex shape and uneven stress when heated externally. Although tempered glass can be more than doubled in two years to increase the process of "homogenization" treatment and reduce the self explosion rate, at present, "homogenization" treatment of tempered glass is mainly used in industrial fields, such as automotive glass, building doors and windows, furniture accessories, etc

regulations of countries around the world on the management of glass cookers (tableware)

some countries in the United States, Japan and Europe have long used glassware as the main kitchen utensils. There are many problems, but also earlier. For this reason, some countries have issued regulations on the production, classification and use of glassware, clearly specifying what is heat-resistant glass and its key performance parameters. Some have made restrictive provisions on the scope of use of tempered glass. For example, the conventional spring tension and pressure test formulated by Japanese government departments in 2001 is made into the "quality mark of glass eaters" according to the technical requirements specified in the national standard of spring tension and pressure testing machine. Zhonghua glass () Department