what is crystal? High lead glass.

The composition of ordinary glass is silicon dioxide (SIO). Crystal is high lead glass, or lead crystal glass, that is, adding 24% lead oxide PbO into ordinary glass. The content of PBO is 24% according to the international standard. At this time, the chemical properties of the crystal are the best. Compared with the ordinary glass, it is mainly reflected in the heavy ratio (heavy hand feeling), high refractive index (five colors and six colors that can transmit the spectrum), and high hardness (wear resistance).

Lead glass with 24% lead oxide PbO can be made into high-quality lead glass works of art by refining, removing impurities, blowing by hand, polishing and fine carving. The light can reflect five colors and six colors through the carved facets.

2. 24% PbO: mark of high quality and high lead glass. Generally, non brand crystal products do not meet this standard, only less than 10%, or simply do not contain lead oxide PbO, pseudonymous crystal, just like some products of nameless small workshops.

3. Natural crystal: natural block, only suitable for stone collectors, lead oxide PbO content is usually 5% to 10%, which is a mineral raw material, with large impurity content, not suitable for direct processing and manufacturing of high-quality glassware. Only after refining and adding lead oxide PbO, the content can reach 24%.

4. There are only strict concepts in the world:

Glass: ordinary glass products.

Crystal: lead glass, or crystal, lead oxide PbO content reaches 24%, which is the international standard. Due to the technical and technological level, there are few domestic lead glassware.

5. Concept confusion in the Chinese market: merchants often pass transparent and transparent glass as crystal. There is a K9 glass in the domestic market, which is a kind of optical glass. It looks very transparent and transparent. After cold processing and cutting, it can be used for lettering, making signs and other cheap crafts. Its hardness is very low, its handle is very light, and it doesn't transmit color. Sometimes its outer surface can be In order to spray some colors, the cost per kilogram is only more than 10 yuan. It does not contain lead oxide PBO and cannot be melted and blown into glassware.

6. Concept of pure crystal: lead glass with lead oxide PbO content of 24% cannot be understood as 100% lead oxide PbO content. Lead oxide PbO is a kind of metal raw material, non-toxic. When the content is higher, it will lose the quality of crystal clear glass. If the content is higher or to 100%, it is a metal product. No one wants it.

7. Only by melting the high lead glass raw materials with 24% lead oxide PbO content in the international regular large factories, and by a series of high-level handmade products, can its brand products have high quality assurance.

8. How to identify crystal and glass: only the products of large international brands and factories have quality and technical guarantee, that is, to see the brand and recognize the brand. In addition, common methods are used to distinguish:

(1) listen to the voice. The sound you hear when you hit the utensils with your hands will be different. The sound of crystal products is clear and crisp, and there will be a lingering feeling after a metal like impact, while the sound of glass products is heavy and unresponsive.

(2) weigh. Two items of the same size, crystal products are heavier than glass, and glass products are lighter.

(3) refraction. Under the same light, the refractivity of crystal products is higher than that of glass, which can transmit seven rainbow light, and the glass products do not show colorful light.

(4) specific hardness. The hardness of crystal is greater than that of glass, so when you use crystal to scratch the surface of glass, you will leave a trace, but when you use glass to scratch crystal, there is no such trace.

9. Difference between manual crystal and mechanism crystal:

Manual method: lead glass melts to a viscous state, sometimes there are individual bubbles left, one piece is picked up at one end of the long steel pipe, and a series of pure manual manufacturing, such as turning, blowing, modeling, cutting, carving, polishing, polishing, etc. refer to the production process segment of the website. Manual features: small output, high cost, each unique shape, unique, limited, suitable for collection. Color products can only be made by hand. Limited to high-end consumption, appreciation.