Generally speaking, the higher the transparency and clarity is higher and more uniform, the better uniformity of the vessel wall as thin as possible; in addition, the vessels and the shape of the mold is consistent, whether the evaluation is smooth sealing vessel index.
Sodium calcium glass and lead crystal glass with different optical properties of lead crystal glass is good, good light transmittance, impact of metal, feel heavy, and most of the surface without the pattern, vessel wall is thin, very transparent, generally used as high-grade ware. The sodium calcium glass permeability is poor, the wall thickness, the surface of the pattern are mostly to cover up the production of bubbles, poor quality glassware because of impurities in the cup to see when the blue or green. In addition, through the analysis of the content of the test, and ultimately determine the actual composition.
From the price aspect, because the lead crystal glass, high borosilicate glass with lead oxide, boron oxide, increasing the cost, so the same size glass prices from high to low order is lead crystal glass, high boron glass, sodium calcium glass; pressure blowing glass manufacturing method of price than pressing high; complex process vessels is simple process vessel prices higher, glassware generally have feet (such as goblet) price than no foot high, such as glass, first with pressure - blowing blowing cup, then making the cup feet, finally finished two for one. The process is complex, the price of natural high, on the contrary, simple process, high production efficiency (such as the production of the ashtray, one minute can be pressed 100), the price is relatively cheaper; glass surface decoration is directly molded packaging Glassware more than a process, the price also increased accordingly.
Glass with the same quality, the cheapest white color is white, still expensive, more expensive static color variegated; different quality prices vary, the more expensive the more superior quality (such as the optimal level than your system level); well-known brand than the general brand expensive; due to the difference of the production technology, different the national production with the same quality of glass, the price is different, the current production of glass production in the ranking of France, Germany and Japan.
It is understood that the glass components of the same system, the content of SiO2 is higher the higher transparency, thermal stability and chemical stability is better than NA2O, K2O has a high refractive index, transparency and gloss, while its whiteness is good, but because the price of raw materials of high potassium, in reality a not common for the production of glass raw materials are sodium calcium glass, high borosilicate glass, high white material and lead crystal glass (Gao Qianjing glass containing PbO:30 ~ 35%, PbO:24 ~ 30% with lead crystal glass, lead crystal glass (also called crystal glass) containing PbO:24%, low lead crystal glass containing PbO:24%) four.
Among them, the lowest cost of soda lime glass, used for the production of ordinary glass; borosilicate glass in the heat level is better than sodium calcium glass, the material cost is higher than the former; because of the characteristics of high white material has good withstand sharp temperature changes, used for the manufacture of microwave oven glassware, but also the cost of material some high. Lead crystal glass has a very high permeability, only a few developed countries to master the production technology, usually used in the production of high-grade glass, the highest cost of materials. In addition, the use of lead crystal glass made of a high degree of manual processing, processing costs and added value are high.
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