Neutral glass promotes the improvement of pharmaceutical glass packaging
at the 10th annual conference held in Frankfurt, Germany, glass experts proposed 3.3 - the main chemical composition, chemical stability and physical performance technical indicators of borosilicate glass and neutral glass in China's plastic extruder industry are moving towards a healthy and sustainable development. Among them, the chemical composition and physical and chemical properties of 3.3-borosilicate glass are basically the same as those of China's super hard materials and GG17 materials. The main difference is that the control range of linear thermal expansion coefficient is different. The control range of linear thermal expansion coefficient has not been strictly stipulated for these two kinds of glasses in China. The performance difference between international neutral glass and China's neutral glass is quite obvious. In the future, we should actively develop international neutral glass production and gradually restrict the use of our original concept of neutral glass, which is becoming the consensus of the industry
in China, low borosilicate glass is the so-called neutral glass that has been used for many years. Compared with the international neutral glass, the chemical composition of the two is very different. The boron content of neutral glass in China is low, so the linear thermal expansion coefficient is large, and the particle water resistance cannot maintain HGB1 level. This is because the glass material of neutral 53 concrete block in China is relatively general, so it is reflected that the water resistance of the inner surface is also poor. The water resistance of the inner surface of international neutral glass can meet the requirements of ISO4802-HC1, while it is difficult for Chinese neutral glass to meet the requirements. In the international standard ISO and drawing the corresponding animation curve and the physical imitation "classification and test methods of glass in normal mass production by composition", the packaging glass has been clearly divided into three kinds: International neutral glass, borosilicate glass and sodium calcium glass
the latter is more accurate than the former.
in this international standard, sodium calcium glass is not indicated as medicinal, and the international neutral glass is recognized as the preferred glass for drug packaging materials in the world. In the domestic pharmaceutical industry, it is also called grade a ampoule glass, 5.0 glass or grade a material, and 5.0 here means that its expansion coefficient is not greater than 5.0 Because the water resistance, acid resistance and alkali resistance of this glass are first-class, it can be said to have excellent chemical stability and thermal stability. As a drug packaging material, it has incomparable advantages in ensuring the quality of drugs