When the use of glass tableware labels is missing

Crystal clear and easy to clean, these features make glass cutlery favored by many consumers. However, the reporter found that due to the lack of understanding of glass products, and the product identity on the market is not clear, many consumers are caught in the use of misunderstandings, such as the use of glass cutlery into the microwave oven, regardless of material, heating, etc., to bring their own security risks.

■Market survey

Portable tablewareProduct identifier missing

Reporters visited the market and found that many large supermarkets sell a wide range of glass tableware, but many products do not clearly indicate the necessary materials such as materials, whether they can be heated and use precautions.

In Auchan Supermarket reporters saw that the glass crisper is generally equipped with a detailed instruction manual, which states the product material, precautions, etc., such as how to use in the oven, in which case the use of dangerous. Some products also marked the product as heat-resistant glass or tempered glass in a prominent place. Some products with packaging boxes also include information on the type of glass and instructions for use on the packaging.

At the same time, however, a large number of glass cups and dishes are often very vaguely marked. Some products simply write the word “glass” on the material, and no other information. What is more, there is only a simple product name and bar code, and no other information is known.

■ Consumer Say

How to use experience

What temperature is the glass used to break? What kind of glass tableware can be in the microwave? How can consumers choose and use glass cutlery when they are unable to learn important information about the product? The reporter conducted random interviews with some consumers.

The public, Ms. Zhang, said that she would generally choose a thicker texture because it looks more solid and may be more resistant to heat. She also believes that glassware 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." Citizen Chen has different views. However, when a reporter asked what kind of tempered glass tableware, she said that sometimes the product trademark would be written. If there is no label, she would choose a more substantial one.

■ tableware Candle Holder glass

Heat-resistant glass marking is still being promoted

Zhao Wanbang, deputy secretary-general of the China Daily Glass Association and senior engineer, stated that there are indeed certain misunderstandings in the use of glass tableware by the public. The most common of them is the use of glassware to store foods in microwave ovens regardless of material. He introduced that there are many varieties of glass used to make cutlery. Only heat-resistant glass is suitable for use in microwave ovens and ovens. It is not as "thick and tempered as can be heated" as the public thinks, and other kinds of glass dishes are incorrectly heated. There is a certain security risk.

The current problem is that ordinary consumers can not distinguish the specific material of glass tableware from the appearance, and some products on the market do not clearly indicate the situation. For this issue, the China Daily Glass Association is promoting the Pyrex certification mark. . The association has formulated a strict assessment system and authorized companies with strict control of the production process, excellent quality, and service clearance to attach certification marks on heat-resistant glass products. By then, the public can use this logo to easily identify heat-resistant glass products. In addition, Zhao Wanbang introduced that the relevant industry standards stipulate the logo map of the tempering utensils for food and beverage on the packaging of goods, and the public can pay attention to distinguishing when purchasing.TableWare Glass

Differentiating types for safe use

Zhao Wanbang introduced that since the main chemical constituents of glass products are inorganic compounds such as silicon dioxide, sodium oxide, and calcium oxide, the state has strict rules on the limits of tableware's precipitation. The glass cutlery and drinking equipment produced by regular enterprises are not available to the human body. Harmful, so consumers basically do not have to worry about glass utensils will cause food safety hazards. The daily contacted glass tableware can be classified into soda-lime glass, namely ordinary glass, borosilicate glass, lead crystal glass, and glass-ceramic glass. Tempered glass is further processed on the basis of ordinary glass. Each of these materials has its own characteristics and should be treated differently.

◎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 and should be used reasonably within this range. For example, if you take out a glass in a cold room and immediately inject boiling water, there is the 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, a common glass crisper is made of it, which is characterized by good chemical stability, high strength, rapid temperature difference is greater than about 110 °C. It has good heat resistance and can be safely used in microwave ovens and ovens. However, when used in different situations, there are still some necessary precautions. First of all, if you use this kind of crisper to refrigerate liquids, be careful not to overfill it. The cover should not be tightly closed. Otherwise, the liquid will swell during freezing. Pressurizing the lid may affect its service life. Second, the lunch boxes taken out of the freezer should not be immediately heated by a microwave oven. Again, do not cover the lid regularly when heating. The gas generated when heating the lid will damage the product. Heating it for a long time will make it difficult to open the lid.

◎Microcrystalline glass

Also called super-heat-resistant glass, a very popular glass pan on the market is made of this material. Its characteristics are particularly good heat resistance, rapid temperature difference in the 400 °C. However, at present domestic manufacturers have not yet started to produce microcrystalline glass pots and pans, so there is no relevant standard for it. It is recommended that when consumers purchase, they should look at the product quality inspection report in detail to fully understand the product performance.

◎ lead crystal glass

This is commonly known as crystal glass and is generally used to make goblets. It is characterized by good light refraction, crisp sound and good hand feel. However, it has been suggested that the use of such cups to hold acidic beverages will lead to the precipitation of lead and endanger health. Zhao Wanbang said that this worry is unnecessary. First of all, the state has strict regulations on the amount of lead precipitated. The strict experimental conditions set in the standard cannot be duplicated in everyday life. In order not to raise doubts about food safety, experts still recommend not using lead crystal glasses for long-term storage of acidic liquids.

◎ Tempered glass

Ordinary glass is made by physical tempering. Compared with ordinary glass, the impact resistance is greatly enhanced, and there are no sharp pointed fragments after crushing, and the heat resistance is also greatly enhanced. However, it is not recommended to heat the tempered glass tableware in a microwave oven, as it may damage the product.

Zhao Wanbang reminds consumers that glass is a brittle material, and the defect is poor impact resistance. Even for tempered glass tableware, impact should not be avoided. In addition, do not use glass balls for any glass products when cleaning. “When it rubs against the glass surface, 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.”

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