The glass is made of quartz sand, soda ash, feldspar and limestone, etc. After mixing, melting and homogenizing at high temperature, the glass is processed and shaped, and then annealed. Widely used in construction, daily use, art, instrumentation and other fields, rich in variety and superior performance. In addition to making all kinds of glass doors and windows, we also often make them into various lenses, decorations and so on. Want to know if the glass is good or not, and whether the glass material used is soda-lime glass, please see below.
First, is the glass commonly used is soda lime glass
Oxide glass is divided into silicate glass, borate glass, phosphate glass and so on. Silicate glass refers to glass whose basic composition is SiO2. It has many varieties and is widely used. Generally divided into different contents of SiO2 and alkali metal and alkaline earth metal oxides in glass:
① Quartz glass. SiO2 content is more than 99.5%, low thermal expansion coefficient, high temperature resistance, good chemical stability, UV and infrared light transmission, high melting temperature, high viscosity, and difficult to form. Mostly used in semiconductors, electric light sources, light-guiding communications, lasers and other technologies and optical instruments.
② High silica glass. Also called vycor glass, the main component is about 95% to 98% SiO2, containing a small amount of B2O3 and Na2O, and its properties are similar to quartz glass.
③ Soda-lime glass. SiO2 is the main content, and it also contains 15% Na2O and 16% CaO. Its cost is low, it is easy to mold, and it is suitable for large-scale production. Its output accounts for 90% of practical glass. Can produce glass bottles, flat glass, utensils, bulbs, etc.
④ lead silicate glass. The main components are SiO2 and PbO. It has a unique high refractive index and high volume resistance, and has good wettability with metals. It can be used to make light bulbs, vacuum stems, crystal glassware, flint optical glass, etc. Lead glass containing a large amount of PbO can block X-rays and gamma rays.
⑤ Aluminosilicate glass. With SiO2 and Al2O3 as the main components, it has a high softening and deformation temperature. It is used to make discharge bulbs, high-temperature glass thermometers, chemical combustion tubes and glass fibers.
⑥ Borosilicate glass. With SiO2 and B2O3 as main components, it has good heat resistance and chemical stability, and is used to manufacture cooking utensils, laboratory instruments, metal welded glass, etc. Borate glass contains B2O3 as the main component and has a low melting temperature, which can resist sodium vapor corrosion. Borate glass containing rare earth elements has a high refractive index and low dispersion, and is a new type of optical glass. Phosphate glass uses P2O5 as the main component, has a low refractive index and low dispersion, and is used in optical instruments.
Can you drink water in a glass?
The glass should be a glass. Don't think that the glass is just transparent and beautiful. Among all the cups, the glass is healthier. The glass does not contain organic chemicals during the firing process. When people use glass When you drink water or other drinks in a glass, you don't have to worry about chemicals being in your belly, and the glass surface is smooth, easy to clean, and bacteria and dirt are not easy to breed on the wall of the glass, so it is healthier for people to drink water in glass. Safer. In addition, experts also advocate the use of enamel cups, because enamel cups are made after high-temperature aging at thousands of degrees, and do not contain harmful substances such as lead, so they can be used safely.
The colorful ceramic cups are very flattering, but actually there are huge hidden dangers in the bright pigments, especially the inner walls are coated with glaze. When the cups are filled with boiling water or drinks with high acidity and alkalinity, these pigments Toxic heavy metal elements such as lead in it are easy to dissolve in the liquid, and people drinking liquids with chemical substances will cause harm to the human body. Plastics are often added to plastics, which contain some toxic chemical substances. Use plastic cups. When filled with hot water or boiling water, toxic chemicals are easily diluted into the water, and the internal microstructure of the plastic has a lot of pores, which contaminates the dirt, and it is easy to breed bacteria if it is not cleaned. Therefore, experts remind, When choosing a plastic cup, you must choose a water cup made of food-grade plastic that meets national standards.