[China Glass Net] crystal clear, easy to clean, these characteristics make glass tableware popular with many consumers. However, the reporter found that due to the lack of understanding of glass products, and the product identification on the market is not clear, many consumers are caught in the misunderstanding, such as the glassware placed in the microwave oven without any material, which brings a safety risk to itself.
â– market research and more missing product identification <br> <br> reporter visited the market found that many large supermarkets sell glass tableware are dazzling, but many products are not clearly marked out the material, can heat and use precautions Necessary information.
In the Auchan supermarket reporter, the glass crisper will generally be equipped with detailed instructions for use, indicating the material of the product, precautions for use, etc., such as how to use it in the oven, under what circumstances the use of danger will occur. Some products are also marked in a prominent position as heat-resistant glass or tempered glass. Some products with a box also indicate the type of glass and instructions for use on the package.
At the same time, however, a large number of glass cups and dishes are mostly markedly blurred. Some products simply write the word "glass" on the material, and no other information. What's more, there are only simple product names and barcodes, and other information is not known.
â– Consumers say how to use experience
At what temperature is the glass not easy to burst? What kind of glass tableware can be put into the microwave oven? How do consumers choose and use glass tableware when they cannot know the important information about the product? The reporter conducted a random interview with some consumers.
Ms. Zhang said that she generally chooses a thicker texture because it looks more solid and may be more resistant to high temperatures. She also believes that glass tableware should be able to be heated in a microwave oven. She has been doing this and has not had any problems.
"Toughened glass is definitely stronger than ordinary glass." Ms. Chen has different opinions. But when the reporter asked what kind of tempered glass tableware, she said that sometimes the product trademark would be written, and when there is no label, she would choose to be thicker.
â– Experts say that the heat-resistant glass logo is still being promoted
Zhao Wanbang, deputy secretary-general and senior engineer of China Daily Glass Association, said that there are certain misunderstandings when using glass tableware. The more common one is to heat the glass tableware in the microwave oven regardless of the material. He introduced that there are many kinds of glass for making tableware. Only heat-resistant glass is suitable for use in microwave ovens and ovens. It is not as thick and tempered as the public thinks, and it is wrong to use other kinds of glass tableware to heat. There is a certain security risk.
The current problem is that ordinary consumers cannot distinguish the specific material of glass tableware from the appearance, and some products on the market do have unclear indications. In response to this problem, China Daily Glass Association is promoting the heat-resistant glass certification mark. . The association has established a strict evaluation system, and authorizes enterprises with strict control of production processes, excellent quality, and service to pass the certification mark on heat-resistant glass products. At that time, the public can easily identify the heat-resistant glass products with this logo. In addition, Zhao Wanbang introduced that the relevant industry standards stipulate the logo of the tempered ware for catering on the commodity packaging. The public can pay attention to the identification when purchasing.
Differentiate category safety use
Zhao Wanbang introduced that since the main chemical components of glass products are inorganic compounds such as silica, sodium oxide and calcium oxide, the state has strict regulations on the limits of tableware. The glassware and drinking utensils produced by formal enterprises are not available to the human body. Harmful, so consumers basically do not have to worry about glassware utensils will cause harm to food safety. The glass tableware that is in daily contact can be divided into soda-lime glass, that is, ordinary glass, borosilicate glass, lead crystal glass, and glass-ceramic. Tempered glass is further processed on the basis of ordinary glass. These materials have their own characteristics and should be treated differently when used.
Soda lime glass
The ordinary glass and bowl in the home are made of this material, and its rapid temperature difference is greater than 50 ° C, which should be used reasonably within this range. For example, if you take out a glass in the refrigerator and immediately inject it into boiling water, there is a possibility of cracking. In addition, soda-lime glass products are not recommended for heating in microwave ovens, otherwise there is a certain safety risk.
Borosilicate glass
That is, heat-resistant glass, the common glass crisper is made of it, which is characterized by good chemical stability, high strength, and a sudden temperature difference of more than 110 °C. It has good heat resistance and can be safely used in microwave ovens and ovens. However, there are still some necessary precautions when used in different situations. First of all, if you use this type of crisper to freeze the liquid, be careful not to overfill it, and the lid should not be tightly closed. Otherwise, the liquid will expand when it is frozen, and the pressure on the lid may affect its service life. Secondly, the lunch box taken out of the freezer compartment cannot be heated immediately by a microwave oven. Again, do not cover the lid when heating normally. The gas generated by heating squeezes the lid to damage the product. Heating for a long time will make the lid difficult to open. ◎Microcrystalline glass is also called super heat resistant glass. The glassware which is very popular on the market is made of this material. Its characteristic is that the heat resistance is particularly good, and the sudden temperature difference is 400 °C. However, at present, domestic manufacturers have not started to produce glass-ceramic pots, so there is no relevant standard for them. It is recommended that consumers pay detailed inspections of product quality inspection reports when purchasing, and fully understand product performance. ◎ Lead crystal glass, commonly known as crystal glass, is generally used to make goblets. It is characterized by good refraction, crisp sound and good hand feeling. However, it has been suggested that using such a cup to hold an acidic beverage can lead to lead precipitation and endanger health. Zhao Wanbang said that this kind of worry is unnecessary. First, the state has strict regulations on the amount of lead. The rigorous experimental conditions set in the standard cannot be reproduced in daily life. In order not to doubt the food safety, experts still recommend not using lead crystal glass for long-term storage of acidic liquids. ◎ Tempered glass ordinary glass is formed by physical tempering. Compared with ordinary glass, the impact resistance is greatly enhanced, and there is no sharp sharp corner fragments after breaking, and the heat resistance is greatly enhanced. However, it is not recommended to heat the tempered glass tableware in a microwave oven, otherwise the product may be damaged.
Zhao Wanbang reminds consumers that glass is a brittle material and its defect is poor resistance to impact. Even tempered glass cutlery should not be avoided. In addition, do not use steel balls to brush any glass products when cleaning. “When it rubs against the surface of the glass, it will form scratches that are invisible to the naked eye, which will affect the strength of the glass products to a certain extent and shorten the service life.â€
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