Question 2: Are lead-free glasses the same as ordinary glasses? How to identify lead-free glasses?
1, look at the logo: lead-free glass generally contains potassium, mostly high-grade handicrafts and has a logo on the outer packaging; Lead-containing glass contains lead, which is a common crystal glassware in some supermarkets and stalls, and its lead oxide content can reach 24%.
2, look at the color: lead-free glass has better refraction than traditional lead-containing crystal glass, which perfectly shows the refraction performance of metallic glass; For example, some ornaments of various shapes, crystal wine glasses, crystal lamps and so on. It is made of lead-containing glass.
3, look at heat resistance: glasses can generally withstand high temperatures, but generally have poor resistance to extreme cold and extreme heat. Lead-free crystal glass is a kind of glass with high expansion coefficient, and its extreme cold resistance and heat resistance are worse. If you make tea with boiling water in an extremely cold lead-free glass, it will burst easily.
4. Weight: Compared with lead-free crystal glass products, lead-containing crystal glass products are slightly heavier.
5. Listening to the sound: Beyond the metallic sound made by lead-containing crystal glass, the sound of lead-free glass is better, and it is known as the "music" cup.
6, look at toughness: lead-free glass is more toughness than lead-containing crystal glass, that is, impact resistance.
At present, there is no national standard for crystal glass in China, so many enterprises are producing according to EU standards.
In EU standards, crystal glass is divided into lead-free, lead-containing and high lead. The lead oxide content of lead glass reaches 24%; The lead oxide content of high lead glass reaches 36%.
If crystal glass containers are produced according to EU standards, no matter what kind of products and the lead content, there are strict regulations in the world, which should be safe for human body. However, due to the lack of domestic standards, it is not excluded that individual manufacturers produce at will, and the product quality is difficult to guarantee.
Therefore, it is suggested that when using lead-containing glassware in daily life, acidic drinks or food should be avoided as much as possible, and it is best to use ordinary glasses. If possible, it is safer and more reliable to use lead-free crystal glass as wine glasses and kitchen utensils.
Question 3: Lead-free glass bottles, apart from glass formers such as silicon dioxide and boron trioxide, how to distinguish lead glass from glass containing a lot of lead oxide? Used for manufacturing optical glass, electric vacuum glass, low-temperature sealing glass, radiation-proof glass, lead crystal glass, flint optical glass, low-melting glass, delay line glass, high-refraction microbead glass and artistic ware glass. The price is higher than ordinary glass, so lead glass will not be used in daily life.
Question 4: How to tell whether there is lead glass in the glass bottle for soaking wine? Or lead-free glass? In addition to glass formers such as silica and boron trioxide, lead glass also contains a lot of lead oxide. Used for manufacturing optical glass, electric vacuum glass, low-temperature sealing glass, radiation-proof glass, lead crystal glass, flint optical glass, low-melting glass, delay line glass, high-refraction microbead glass and artistic ware glass. The price is higher than that of ordinary glass, so Sichuan Glass will not use the lead glass used in daily life.
Question 5: How to distinguish lead-free glass from lead-free glass? According to the classification of materials, the glass containers circulating in the market can be divided into ordinary glass containers and crystal glass containers. There are two kinds of crystal glass containers: lead-free crystal glass and lead-containing crystal glass. The lead-free glass we usually see refers to lead-free crystal glass.
Characteristics of crystal glass
Compared with ordinary glass products, crystal glass has bright color, strong refractive index, exquisite workmanship and good feel. It looks like crystal, and it makes a crisp metallic sound when tapped lightly. That's because lead is added, so it's also called leaded glass. Widely used in glass crafts and decorations.
Lead-free glass crystal glass products are slightly thinner than lead-containing crystal glass products, which are characterized by inheriting the appearance quality of lead-containing crystal glass and containing no lead, so they are also called non-toxic glass. Widely used in high-grade porcelain, tableware and wine sets.
Characteristics of ordinary glass
Ordinary glass products are dull in color, poor in refractive index, rough in workmanship, poor in nail feeling, and even have bubbles in some places, and the sound of tapping will be dull. Its advantages are lead-free and non-toxic. Widely used in food glass containers and medical devices.
Question 6: The materials of red wine glasses can be divided into ordinary glass, leaded crystal glass and lead-free crystal glass. There are two kinds of crystal glass containers in circulation in the market: lead-free crystal glass and lead-containing crystal glass. The former generally contains potassium, mostly high-grade handicrafts and marked on the outer packaging; The latter contains lead, that is, crystal glassware common in some supermarkets and stalls, and its lead oxide content can reach 24%. Lead-containing glass is very harmful to human health, so glassware that touches food is required to be lead-free. Xiao Lei Andiser, please don't reprint the original.
Crystal and glass are very similar in appearance, but they are two completely different substances. The main differences are as follows:
1. Crystals with different materials are silicon dioxide crystals, while glass is only a mixture containing silicon dioxide in the molten state. Xiao Lei Andiser, please don't reprint the original.
Second, glass with different functions only has decorative function, while crystal has piezoelectric effect in addition to decorative function and has special health care function.
Third, the unit price of crystals with different prices is several times or even dozens of times higher than that of glass. Xiao Lei Andiser, please don't reprint the original.
Fourth, the physical properties are different. 1. Crystal is a kind of crystal with high hardness (Mohs 7), while the hardness of glass is low (Mohs 5.5). Crystals can draw marks on glass, and vice versa. 2. Crystal is a kind of crystal with good thermal conductivity, and it will feel cold when touched with the tip of the tongue. The glass looks warm. 3. use polarizer to distinguish, crystal can transmit light, glass can't. According to the different physical properties of crystal and glass, we can distinguish them conveniently. Xiao Lei Andiser, please don't reprint the original.
5. Glass with different processing techniques can be hot-cast, which saves materials and labor and has low cost. Crystal is a crystal, which is irreversible after heating and melting, so it can't be molded by hot casting, but only by cold working methods such as cutting and grinding. Waste of materials and manpower, high cost. Crystal has high hardness and is not easy to wear. Glass has low hardness and is easy to scratch. The crystal has good stability and will not change color after long-term use. And glass turns yellow easily. Xiao Lei Andiser, please don't reprint the original.
How to distinguish lead-containing crystal glass from lead-free crystal glass? You can distinguish glass, lead-containing crystal glass and lead-free crystal glass by sound, feel and appearance. Ordinary glass products are dull in color, poor in refractive index, rough in workmanship, poor in hand feel, and even have bubbles in some places, and the sound of tapping lightly is dull. Compared with ordinary glass products, crystal glass products have bright colors, strong refractive index, exquisite workmanship and good hand feel. They look like crystals, and when tapped, they make a crisp metallic sound. Compared with lead-free crystal glass products, lead-containing crystal glass products are slightly thicker. Xiao Lei Andiser, please don't reprint the original.
Lead-free intraocular lens is to add other elements (such as potassium commonly used in optical glass) to replace lead used in the original production process. It not only contains the advantages of lead-free artificial crystal, but also is extremely elastic and crystal clear, so that the lead-free crystal cup has excellent light transmittance and crystal clear texture. And it does not contain lead, so it is more environmentally friendly, healthy, safe and non-toxic. It is the new mainstream of crystal glass in European and American markets. Lead-free crystal cups are harmless to the body, which refers to the lead content of artificial crystals. Lead-free method needs to precipitate lead by hot melting, which is actually not absolute freedom, but an order of magnitude difference. )
Lead-free glass is similar to lead-free crystal glass, and its main component is also silicon dioxide. Lead-free crystal only introduces lead, barium, zinc, titanium and other substances into lead-free glass. This kind of glass is called crystal glass because of its high transparency and refractive index and smooth appearance. Xiao Lei Andiser, please don't reprint the original.
It is mainly white crystal glass, with lead content of 24% (or above) being all-lead crystal and lead crystal content less than 24%, with good refractive index, high hardness and heavy specific gravity. But it is easy to break, soften and wear. Moreover, long-term experiments have proved that lead in lead-containing crystal cups will precipitate and dissolve in wine or acidic drinks. Long-term use will lead to lead accumulation, poisoning and damage to health. Modern people pay more and more attention to the concept of environmental protection and health, so lead-containing crystal products will be more and more challenged by environmental protection and health.
At present, it is very rare in China, and it will basically appear in quite cheap glasses, which needs no explanation.
Xiao Lei Andiser, please don't reprint the original.
Question 7: There is a difference between lead glass cooler and lead-free glass cooler. Lead-free crystal glass generally contains potassium, which is harmless to human body. It is more transparent, tougher and more durable than ordinary glass and leaded glass. Ordinary glass is fragile and has poor refraction. Lead-containing glass, also known as lead-containing crystal glass, is more transparent and refractive, but it is not as good as lead-free glass containing potassium and is not as durable as it.
Question 8: The difference between lead-free crystal cups and glasses. Crystal cup is also a kind of glass, the main component is silicon dioxide, except for the introduction of lead, barium, zinc, titanium and other substances. This kind of glass is called crystal glass because of its high transparency and refractive index and smooth appearance.
If lead is introduced, it is a lead crystal.
Barium, zinc and titanium are introduced into lead-free crystals.
Question 9: How to identify whether a glass bottle contains lead? There are two kinds of glass: ordinary glass and crystal glass, which are divided into lead-free crystal glass and lead-containing crystal glass. So how do we identify lead-free glasses?
The method is actually very simple. We can distinguish lead-containing glass from lead-free glass by looking at weight, logo, color and heat resistance.
How to identify lead-free glass
1, look at the logo: lead-free glass generally contains potassium, mostly high-grade handicrafts and has a logo on the outer packaging; Lead-containing glass contains lead, which is a common crystal glassware in some supermarkets and stalls, and its lead oxide content can reach 24%.
2, look at the color: lead-free glass has better refraction than traditional lead-containing crystal glass, which perfectly shows the refraction performance of metallic glass; For example, some ornaments of various shapes, crystal wine glasses, crystal lamps and so on. It is made of lead-containing glass.
3, look at heat resistance: glasses can generally withstand high temperatures, but generally have poor resistance to extreme cold and extreme heat. Lead-free crystal glass is a kind of glass with high expansion coefficient, and its extreme cold resistance and heat resistance are worse. If you make tea with boiling water in an extremely cold lead-free glass, it will burst easily.
4. Weight: Compared with lead-free crystal glass products, lead-containing crystal glass products are slightly heavier.
5. Listening to the sound: Beyond the metallic sound made by lead-containing crystal glass, the sound of lead-free glass is better, and it is known as the "music" cup.
6, look at toughness: lead-free glass is more toughness than lead-containing crystal glass, that is, impact resistance.