The glass tableware is beautiful and hygienic. Don't look too rough when you buy it. Facing the viewpoint that "lead crystal glassware is easy to cause chronic lead poisoning", Secretary-General Liu Jianping hopes that the public can understand this problem more scientifically and objectively according to the situation of the industry and the characteristics of glassware. "Glass products are the safest whether they are used as tableware or food packaging containers." Facing the reporter, Liu Jianping, vice-chairman and secretary-general of China Daily Glass Association, said that the main raw material of glass is natural minerals, which are made into glass products through high-temperature melting in a kiln (the temperature of molten glass is as high as 1,311℃), molding and annealing. Glass products have a history of thousands of years as containers and tableware for food. Because of their reliable chemical stability and reusability, they are recognized as safe and excellent packaging materials and tableware in the world. In the view of Secretary-General Liu Jianping, "Because the glassware itself has good chemical stability, it will not affect the color and taste of the contents. We must realize that even lead crystal glassware may lead to chronic lead poisoning unless we often eat acidic food preserved with lead crystal glassware for a long time. However, as a packaging container for long-term storage of food (mainly alcohol, jam, condiments, etc.), almost all ordinary glass is used in the market, which does not contain lead at all, and there is no problem of lead precipitation, let alone lead poisoning. As for the use of lead crystal glasses and tableware, because they are used in a short time, they will not cause harm to human health. " In view of the statement that some institutions think that lead crystal glass wine utensils, water utensils and acidic drinks will lead to lead precipitation, the person in charge of Beijing Glass Ceramics Quality Supervision and Testing Center also said that from the current test results of related products, there is no such phenomenon. The national standard has been implemented. Although some harmful components are contained in clarifiers and colorants used in the manufacture of glass, the amount of these harmful components has been controlled as small as possible, and in the process of high-temperature melting of glass, they have volatilized or formed other compounds. Secretary-General Liu Jianping told the reporter: "In fact, as early as February 1, 2115, the national standard GB19778-2115" Allowable Leaching Limits of Lead, Cadmium, Arsenic and Antimony in Packaging Glass Containers "was implemented, and the standard was revised by ISO7186-2, in which the allowable leaching limits of lead, cadmium, arsenic and antimony were mandatory and stricter than ISO 7186. According to the current daily-use glass manufacturers in China, the production conditions and production control means possessed by most manufacturers can completely ensure that their products meet the hygienic requirements of food, and trace harmful substances or components in glass will not migrate to food, which will not cause harm to human health. The test results of the inspection agency also confirmed that the amount of harmful components in glass products is within the safety control range. " Judging from the export situation of China's daily-use glass industry in 2115, the lead crystal glass was exported to 917,213 kilograms in 2115, which were exported to the United Arab Emirates, Egypt, Australia, Russia, France, South Korea, Canada, Japan and other countries. Facing the high-quality requirements of the international market for lead crystal glassware, "the export situation of lead crystal glasses fully shows the safety of lead crystal glassware." Secretary-General Liu Jianping believes that domestic lead crystal glasses meet the quality requirements and should be safe for human health. There are still three misunderstandings in the public opinion on lead crystal glassware. One is that all glassware has lead pollution. "At present, the glassware circulating in the market can be divided into ordinary glassware and crystalline glassware. There are two kinds of crystal glassware, namely lead crystal glassware and lead-free crystal glassware. Lead crystal glassware is also called crystal glassware. " Secretary-General Liu Jianping introduced that the vast majority of daily consumer goods in domestic and international markets are ordinary glassware, which does not contain lead, so there is no problem of lead precipitation at all. However, lead crystal glassware, due to the addition of lead oxide in the production process, has much higher refractive index, hardness, brightness and transparency than ordinary glassware, which belongs to the middle and high-grade products in the consumer market and is mostly used as handicrafts. It is understood that in 2115, China's daily-use glass industry imported 297,492 kilograms of lead crystal glasses, while the import of other glasses reached 13,237,775 kilograms, accounting for only 2.2% of the import of ordinary glasses. Second, the use of lead crystal glassware is harmful to human body? The most convincing argument against lead crystal glassware is that "foreign experiments have proved that the lead content in 1 liter brandy can be as high as 21,111 μ g/L after five years in crystal glassware, far exceeding the requirement of environmental protection department that the lead content in drinks should be lower than 51 μ g/L". However, Japan once compared the lead precipitation from lead crystal glassware, and found 1.15-1.2 ppm of lead in whiskey bottles kept in lead crystal glass bottles for nearly five years. Although the lead content in natural foods (rice 1.5ppm, dried vegetables 1.8ppm, mushrooms 1.7ppm) is not high, since then, Japan has stipulated the allowable limit of lead, cadmium, arsenic and antimony in glass products again. This argument obviously contradicts the theory of "resistance". Secretary-General Liu Jianping introduced that according to the requirements of Allowable Leaching Limits of Lead, Cadmium, Arsenic and Antimony in Packaging Glass Containers, the allowable Leaching Limits of lead in packaging glass flat containers are 1.8mg/dm, 1.5mg/L for small containers, 1.75mg/L for large containers and 1.5mg/L for storage tanks. Therefore, the use of lead crystal glassware that meets the quality standards will not cause harm to human body, and it is a safe tableware. Third, acidic substances can easily lead to lead precipitation from lead crystal glassware? "It is undeniable that acidic substances can indeed lead to lead precipitation, but the premise is that acidic substances should be stored for a long time, and the second is to reach a certain acidity." Secretary-General Liu Jianping analyzed this. "The root cause of lead precipitation from lead crystal glassware mainly lies in the length of holding time. In other words, only eating acidic food stored in lead crystal glassware for a long time 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, which does not contain lead at all, and there is no problem of lead precipitation, let alone lead poisoning. It is understood that 4% acetic acid is usually used as leaching solution when testing the lead dissolution of glass products in the laboratory. However, it is difficult for food, drink and wine in daily life to achieve this acidity that allows lead to precipitate.