The difference between neutral borosilicate glass and low borosilicate glass is obvious

Low borosilicate glass is the so-called u0026#;neutralu0026#; glass that has been used in China for many years. Compared with international neutral glass, there is a big difference in chemical composition between the two. The boron content of low borosilicate glass is low, so the linear expansion coefficient is large, so it is not as good as neutral glass in terms of strength, thermal shock resistance, and freezing resistance. In actual use, it is shown as a small amount of peeling. The middle is in the shape of fish scales and pine needles; the bottle is easy to break during use (especially for freeze-dried preparations). In addition, low borosilicate glass adds more sodium oxide during melting, so that the sodium ions that can be released are relatively large, which causes stability and compatibility problems in the contact between the drug and the glass. As the low borosilicate glass material is poor, it reflects that the water resistance of the inner surface is also poor. The medium borosilicate glass bottle has a very low linear expansion coefficient, so it has good thermal stability. It has high hardness and good abrasion resistance. Under the same conditions, it is only one-fourth of the abrasion resistance of ordinary glass. The surface damage of the product is small and the service life is long. High thermal conductivity, because the medium borosilicate glass will not be corroded to form an oxide film, it has high thermal conductivity. The resistivity is large. Because the medium borosilicate glass has less monovalent metal ions, it has a small dielectric constant and high resistivity. It is a high-quality electric vacuum glass. Good chemical stability, this kind of glass has strong resistance to water and acid erosion, but it has poor alkali resistance. The process melting temperature of medium borosilicate glass bottles is high (1680℃). Generally, suitable clarifiers, high-quality refractory materials, electric auxiliary heating and full electric melting technology are used; the layering of the glass liquid; the improvement of the lower glass liquid Temperature to improve its fluidity and reduce stratification, and use furnace bottom discharge device; the glass liquid is easy to separate phases, select the appropriate glass composition, and reasonable processing technology. The international neutral glass is recognized as the first choice for pharmaceutical packaging materials in the world. Because the water resistance, acid resistance and alkali resistance of this kind of glass are all first-class, it can be said that it has excellent chemical stability and thermal stability. Medicine packaging materials have incomparable advantages for ensuring the quality of medicines.