“Either as a food container or a food packaging container, glass products are the safest.†In response to the reporter, Liu Jianping, deputy chairman and secretary general of the China Daily Glass Association, expressed this sentence with certainty.
The main raw materials of glass are natural minerals, which are made into glass products by high-temperature melting in the kiln (melting glass temperature up to 1300°C), forming, annealing and other processes. Glassware has been used as a food container and food utensil for thousands of years. Due to its reliable chemical stability and reusability, it is recognized as a safe, excellent packaging material and dining utensil in the world. In the view of Secretary-General Liu Jianping, "Since the glassware itself has good chemical stability, it will not affect the contents of the glassware, regardless of color or taste. We must realize that even lead crystal glassware, unless it is Regular consumption of acidic foods that have been preserved in lead crystal glassware may lead to chronic lead poisoning, but as packaging containers for long-term storage of foods (mainly liquors, jams, condiments, etc.), Almost all of the glass used in the market is ordinary glass, it is free of lead, and there is no problem of lead precipitation, let alone the problem of lead poisoning. As for the use of lead crystal glasses and cutlery, since it is used in a short time It will not cause harm to human health."
For some organizations that lead crystal glass wine, drinking equipment, containing acidic beverages, lead to lead out of the argument, the Beijing Glass Ceramic Quality Supervision and Inspection Center, also said that from the current test results of related products, There is no such phenomenon.
National standards have been implemented
Although the clarifiers and colorants used in the manufacture of glass contain some harmful ingredients, the amount of these harmful ingredients has been controlled to be as small as possible, and they have been volatilized or formed during the high-temperature melting of glass. compound of.
Secretary-General Liu Jianping told the reporter: "Actually, as early as December 1, 2005, the National Standard GB19778-2005 "Leakage Permissible Limits for Lead, Cadmium, Arsenic, and Tellurium in Packaging Glass Containers" has been implemented, and the standard was modified to adopt ISO7086-2. Standards, including lead, cadmium, arsenic, and antimony dissolution limits are mandatory standards, and are stricter than the control index of ISO7086-2. Judging from the current domestic glass manufacturing enterprises in China, most manufacturers have the production conditions and production control. The means can completely guarantee that the product meets the hygienic requirements of the food loaded with the food, and no trace of harmful substances or harmful components in the glass will migrate into the food and will not cause any harm to human health.The inspection results of inspection agencies also prove harmful in glass products. The volume of analysis is within the scope of safety control."
Judging from the export situation of China's daily-use glass industry in 2005, the lead crystal glass cup exported 917,213 kg throughout the year and was exported to the United Arab Emirates, Egypt, Australia, Russia, France, South Korea, Canada, Japan and many other countries.
In the face of the high quality requirements for lead crystal glassware in the international market, “the export of lead crystal glassware fully demonstrates the safety of lead crystal glassware.†Secretary-General Liu Jianping believes that domestic lead crystal glass is Compliance with quality requirements should be safe for human health. There are still three misunderstandings in the treatment of lead glassware
First, lead contamination in all glassware?
"Currently, glassware circulates in the market can be divided into ordinary glassware and crystal glassware. Crystal glassware is divided into two kinds: lead crystal glassware and lead-free crystal glassware. Glassware is also called crystal glassware.†Secretary-General Liu Jianping said that the vast majority of consumer products in domestic and foreign markets are ordinary glassware, and ordinary glassware itself does not contain lead, so there is no problem of lead precipitation. The lead crystal crystal glassware, due to the addition of lead oxide in the production process, therefore, the refractive index, hardness, brightness and transparency are greatly enhanced than ordinary glassware, belonging to the consumer market in the high-end products, mostly as crafts. â€
It is understood that in 2005, China's daily glass industry imported 297,492 kg of lead crystal glass, while other imported glass has reached 13,237,775 kg, and imports of lead crystal glass only accounted for 2.2% of the average glass imports.
Second, using lead crystal glassware is harmful to the human body?
The most convincing argument against the use of lead-crystal glassware is that “there is evidence from foreign experiments that one liter of brandy is placed in a crystal vessel and that five years later, the amount of lead in the wine can be as high as 20,000 micrograms/gram. The increase is far more than the requirement of the environmental protection department that the amount of lead in drinks should be less than 50 micrograms per liter." However, Japan once compared the lead precipitation problem of lead crystal glassware, and detected 0.05-1.2ppm lead from whiskey bottles stored in lead crystal glass bottles for nearly five years despite the fact that The lead content (1.5ppm for rice, 1.8ppm for dried vegetables, and 1.7ppm for mushrooms) is not as high, but since then, Japan has re-specified the allowable limits for the dissolution of lead, cadmium, arsenic, and antimony from glass products, and has set stricter standards. , and form international standards in international trade. This argument is obviously in contradiction with the "boycott" theory.
Secretary-General Liu Jianping introduced that according to the requirements for the allowable limits for the dissolution of lead, cadmium, arsenic, and antimony from packaging glass containers, the allowable lead-dissolution limit for packaged flat glass containers is 0.8 mg/dm, that for small containers is 1.5 mg/L, and that for large containers is 0.75 mg. /L, storage tank 0.5mg/L. Therefore, the use of lead crystal glassware that meets the quality standards will not harm the human body and is a safe food and beverage appliance.
Third, acid substances easily lead lead crystal glassware lead precipitation?
"It is undeniable that acidic substances can indeed lead to the precipitation of lead, but the first condition is to store acidic substances for a long time and the second is to achieve a certain degree of acidity," said Liu Jianping.
“The main reason for the lead deposition of lead crystal glassware is mainly the length of time it takes to live. That is to say, only the regular consumption of acidic foods stored in lead crystal glassware can lead to chronic lead poisoning. Secretary-General Liu Jianping believes that as a container for long-term storage of food, almost all ordinary glass products are used in the market. They do not contain lead, and there is no problem of lead precipitation. It is even less likely to lead to chronic lead poisoning.
It is understood that in the laboratory testing of lead dissolution of glass products, 4% of acetic acid is usually used as a leach solution. It is very difficult for foods, beverages, and wine in daily life to reach such acidity that allows lead to separate out.
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