How to identify the quality of glassware

Generally speaking, the higher the transparency, the higher the definition, the more uniform the uniformity, the thinner the wall of the vessel is. The more the vessel and the shape of the mold match, the smoothness of the seal is also the evaluation of the vessel. index. Generally speaking, the higher the transparency, the higher the clarity, the more uniform the uniformity, and the thinner the container wall. The more the shape of the container and the mold match, the smoothness of the seal is also an evaluation of the container. index.
The difference between soda lime glass and lead crystal glass is that lead crystal glass has very good optical properties, good light transmittance, metallic texture, heavy hand feel, most of the surface has no pattern, and the wall of the vessel is thin and very transparent. It is generally used for high-end vessels. Soda-lime glass has poor air permeability, thick wall, and most of the surface has patterns, which cover the air bubbles produced by production. Poor-quality glassware will appear blue or green when filled with impurities. In addition, the actual composition can be determined by assaying the content.
In terms of price, due to the addition of lead oxide and boron oxide to lead crystal glass and high boron glass, the cost increases, so the prices of glassware of the same specification are lead crystal glassware and high boron glassware from high to low. Soda-lime glassware; glassware made by pressure blowing method is more expensive than glassware made by pressing method; utensils with complex craftsmanship are more expensive than simple utensils, and the price of glassware (such as goblet) is generally cheaper than that of feet. The height of the feet, like a goblet, must be blown out with pressure blowing, then the cup is made, and the finished product is complete. The process is complicated and the price is naturally high. On the contrary, the process is simple and the production efficiency is high. The speed is fast (such as the production of ashtrays, which can be pressed 100 pieces a minute), and the price is relatively cheap; the surface-decorated glassware has more processes than direct molding glassware, and the price is correspondingly increased.
In terms of price, since lead crystal glass and high boron glass are added with lead oxide and boron oxide, the cost increases, so the price of the same specification glassware is from high to low, lead crystal glassware, high boron glassware. Soda-lime glassware; the price of glassware made by pressure-blowing method is higher than that of pressing method; the vessel with complicated process is more expensive than the simple one, and the price of glassware (such as goblet) is generally less than that of the foot. The height of the foot, such as the goblet, must be blown out by the pressure-blowing method, then the cup is made, and the finished product is finished. The process is complicated and the price is naturally high. On the contrary, the process is simple and the production efficiency is high. Fast (such as the production of ashtrays, 100 can be suppressed in one minute), the price is relatively cheaper; glassware with surface decoration has a more process than the directly molded glassware, and the price is correspondingly increased.
The same quality of glassware, white is cheaper, static color is more expensive than white, variegated color is more expensive than static color; the price of different quality is different, the better the quality, the more expensive the price (if the grade is more expensive than the level); the famous brand More expensive than the average brand; due to the difference in production technology, the same quality of glassware produced in different countries, the price is different, the current production of glassware is ranked in France, Germany, Japan and so on.
It is understood that the higher the SiO2 content of the same system, the higher the transparency, the better the thermal stability and chemical stability, K2O has a higher refractive index than NA2O, has a luster, and its transparency and whiteness are better. However, due to the high price of potassium raw materials, it is generally not used in reality. The common raw materials used for the production of glassware are calcium soda glass, high boron glass, high white material and lead crystal glass (high lead glass containing PbO: 30~) 35%, medium lead glass containing PbO: 24 ~ 30%, lead crystal glass (also known as crystal glass) containing PbO: 24%, low lead glass containing PbO: 24% or less).
Among them, calcium sodium glass is low in cost and is mostly used to produce ordinary glass cups; high boron glass is better than calcium soda glass in heat resistance, and its material cost is higher than the former; high white material has good tolerance to sharp temperature difference The changing characteristics are mostly used to make glassware for microwave ovens, and the material cost is even higher. Lead-crystal glass has a high permeability. At present, only a few developed countries have mastered the production technology, and are usually used to produce high-grade glassware, which has a high material cost. In addition, glassware made of lead crystal glass is highly processed by hand, so processing cost and added value are high.