Glass is often used in situations where light and color are required, such as optical instruments and various art decorations, because of its transparency and reflectivity and easy coloring. Modern technology has brought new vitality and vitality to the glass industry, but also made the performance of glass has been greatly improved. We will briefly introduce the difference between crystal and glass, and explain their advantages and disadvantages.
The difference between crystal and glass
Crystal is a very popular gem, the famous ancient Greek philosopher Aristotle also believed that crystal is evolved from ice. In fact, crystal is SiO2 crystal, which has no internal connection with water or ice. It is usually colorless and transparent, but contains iron group elements can have different colors, such as violet, yellow, smoke gray.
The appearance of crystal and glass is very similar, but there are two totally different substances. The main differences are the following five aspects:
First, the material is different.
Crystals are crystalline silicon dioxide, while glass is a mixture of silica containing molten state.
Two, different efficacy
Glass has only decorative effect, while crystal has the effect of piezoelectricity besides decoration.
Three, the price is different.
The unit price of crystal is several times or even tens of times higher than that of glass.
Four. Different physical properties
Crystals are crystals with higher hardness (Mohr 7) and lower hardness (Mohr 5.5). Crystals can scratch marks on the glass, otherwise they cannot.
Five, the processing technology is different.
The glass can be molded by hot casting, saving materials and saving labor costs.
Crystals are crystals that can not be reversed by heating and melting. Therefore, the hot-casting method can not be used, but cold-working methods such as cutting and grinding can only be used. The cost is high and the cost is high.
Crystal hardness is high, it is not easy to wear. Glass is low in hardness and easy to wipe.
Crystal stability, long term use will not change color. And glass is easy to turn yellow.