[China Glass Net] The transparent glassware may not be good. The cost of a good red wine glass is about three yuan... I don’t know how to deal with similar problems. I want to hear what the professors say when buying glassware.
There are a lot of tableware in glass in the supermarket, and the price varies greatly. How to choose is a problem. Don't think that it's all made of glass. If you choose anything, if you choose the wrong one, it will directly harm our health. The reporter contacted Zhu Haitao, an associate professor of glass products at the School of Materials Science and Engineering, Qingdao University of Science and Technology, and asked him to give a point.
Is the crystal clear cup good? In fact, this is a misunderstanding of purchase.
The transparent glass has a high refractive index, looks crystal clear, and then pours a little juice or red wine. Does it feel particularly enjoyable? Everyone thinks that this kind of cup is on the grade and the quality is good?
wrong. Professor Zhu explained that the glassware that looks good on the market, has a strong hand and is glossy, and its material is mostly lead-crystal glass (usually called crystal glass), but such lead-crystal glass is sour and hot. After the lead ions are easily dissolved, affecting human health, especially the health of children. Therefore, such glassware is not a good choice. If you have already bought it, do not use it to hold acidic drinks and hot water such as juice.
Why is the price difference between the cups? Material technology is very different
Why do the glasses that look like the same, can be tens of dollars in price? Professor Zhu said that this should be analyzed from two aspects of materials and technology.
From the material point of view, the current common raw materials for the production of glassware are mainly calcium soda glass, high boron glass, high white material and lead crystal glass. Among them, the cost of calcium sodium glass is lower, which is mostly used to produce ordinary glass cups; the second is high boron glass, its heat resistance is better than that of calcium soda glass; the high white material can withstand the sudden temperature difference change, and it is mostly used to manufacture glassware for microwave ovens. The cost is higher; the lead glass has high permeability, and is usually used to produce high-grade glassware, and lead oxide is added to the raw material, and the material cost is high.
From a process point of view, a process with complicated vessels is more expensive than a simple process. Generally, glassware (such as a goblet) with feet should be blown out of the cup shape, and then the cup is made. The latter is combined with the second one. The process is complicated and the price is naturally more expensive than the foot. The glassware with surface decoration has one more process than the glassware directly molded and the price is correspondingly increased. In addition, there are many manual processing procedures for vessels made of lead crystal glass, so the processing cost and added value are relatively high. In addition to materials and processes, prices are also influenced by brands, and well-known brands are more expensive than general brands.
Which type of material is better? High white material for microwave oven
There are four kinds of materials for making glassware. Which of these four materials is more environmentally friendly and healthy? Professor Zhu said that glassware that can be used for microwave heating is usually made of high white material. This kind of material is relatively stable, and it is relatively healthier for food and beverage. To distinguish the glassware made of four materials is also relatively simple, Professor Zhu taught two methods.
The first method is that the soda-lime glass has poor permeability and wall thickness, and the surface has many patterns to cover the bubbles that occur during production. Some of the poor quality of the cups will be light blue or pale green due to the inclusion of impurities. The glassware of the material has good luster and good transparency, and there are few defects such as stones, bubbles and stripes in the vessel.
Method 2 by hand weight. The cups of the same volume are the same as those made of lead glass, because the lead glass is added with lead, so the hand feels heavier.
☆Dialog
Q: What is better than colored glassware and colorless and transparent?
A: The colored glass is decorated with glass glaze, paint, or coloring agent on the outer surface of the glass to increase the appearance or cover the defects of the glass itself. If the glaze or paint used is unqualified, harmful elements such as lead and cadmium may be precipitated during use, so transparent glassware is better.
Q: Is the glassware with a thick wall thinner than the wall?
A: This question is not. Wall-thick glassware looks more stable, but when hot water is placed, it is more likely to break due to the large temperature difference between the inside and the outside.
Q: Many people like to buy glass products imported from abroad. Which one is more excellent in quality?
A: At present, the production of glassware is ranked in France, Germany, and Japan.
Q: A red wine glass in a supermarket may sell for tens of dollars. What is the cost?
A: Under the premise of determining the good glass material and mature production technology, the cost of a glass is two or three yuan.
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