Glass is probably one of the safest food packaging materials.
Glass is considered by many to be the safest and healthy food container.
In fact, it does. Glassware is resistant to high temperatures and low temperatures, and it also holds on acidic materials with less harmful substances. Inferior plastics, harmful ceramic glazes, and unqualified metals are all unsafe examples we have heard in our lives. The safety properties of glass have always been very high.
However, there is now another rumor that lead in poor-quality glass contains lead and there is a danger of lead dissolution. In fact, ordinary glasses do not contain lead, but high-end crystal glasses will contain lead oxide.
Is it true that the more beautiful it is, the more dangerous it is?
Crystal glass is high-end and good-looking, but more insecure? Speaking from the material of the glass.
Common glass materials are soda lime glass and high borosilicate glass, the latter is better than the former and is the mainstream on the market. And lead glass, the so-called crystal glass, is a high-end material in the glass.
Let's talk about soda-lime glass first. It can be said that it is the most common type of glass. If the temperature difference is too large, it may explode. We see it in life, that is, liquid bottle or infusion bottle.
High borosilicate glass is the mainstream now. It is basically used in dozens of glass in supermarkets. It is light and strong, both hot and cold, and cost-effective choice. Cock cups, ice cream cups, whiskey cups and the like commonly used by everyone are basically this kind of material.
Finally, it is lead glass, which is crystal glass. Crystal glass has many advantages, such as high light transmittance, lighter cuts, excellent echo, thin and uniform, and it is better than the two materials in various aspects, it is the first choice for drinking utensils. In terms of temperament, they have already won.
So, is crystal glass crystal? Or glass? What kind of relationship does it have with Crystal?
Origin of crystal glass
Glass and crystal are different. Crystal glass is actually glass and has no crystal structure. For centuries, it has actually been lead crystal / lead crystal.
The refining technology of lead glass was discovered by the Englishman George Riffen Scott in the 17th century. The biggest difference from ordinary glass is that it contains 18% to 40% lead oxide. Because of the lead component, the glass is easier to soften, easy to cut and sculpt, and has strong light transmission. Therefore, lead glass is used to make handicrafts and optical instruments and high-grade utensils, which is much more expensive than ordinary glass.
As for why it is called crystal glass? This is of course because of people's good wishes. It is derived from the Venetian cristallo and is used to describe the crystals imitation of Murano glass artisans.
The famous Swarovski crystals are in fact glass materials, and they use exquisite design and superb manufacturing techniques to make crystals better than crystals.
The ancients and the present are connected at this moment.
So is lead glass harmful?
The lead precipitation of lead glassware is very small, and normal adults use it as a water glass or wine glass without any impact on the body. However, if spirits such as whiskey or acidic liquids are stored for a long time, there is also a danger of lead poisoning. Those who are sensitive to this are also in the minority.
So, crystal glass evolved.
evolution! Lead-free crystal glass
Many manufacturers now replace lead oxide with barium oxide, zinc oxide, and potassium oxide to make lead-free crystal glass to achieve the effect of lead crystal as much as possible. These lead-free crystal glasses, which are lead-free and heavy metal-free, no longer pose a safety risk.
In accordance with EU 69/493 / EEC regulations, lead oxide content must be more than 24% before it is called a lead crystal. The product label will be marked "Lead-Glass" or "Lead-Crystal". Lead-free crystal glass is labeled "Lead-free" or "Non-lead". Friends who are sensitive to lead crystal can choose crystal glasses with these marks.
Among the glass materials, crystal glass is undoubtedly the most preferable. Its luster has magic that makes you fall in love at first glance, like a piece of dream.
Anyone who likes glassware will sooner or later enter one or more crystal glasses. In the last favorite glass vote, what kind of glass is good enough, let's talk about it, the crystal glass is the best, and people are planting grass. The charm of crystal glass is already visible.
After all, it was born from people's pursuit of materials and beauty. This grass is grown with absolute willingness.