Borosilicate glass article with low boron content

Abstract

The invention relates to a chemically temperable borosilicate glass article having a low boron content and a corresponding Na2O content. The articles have good diffusivities and hydrolytical resistance values. When chemically tempered, the borosilicate glass article exhibits a compressive stress CS>400 MPa and a penetration depth DoL>20[mu]m. The invention also relates to pharmaceutical primary packaging comprising the borosilicate glass article. The borosilicate glass articles and the borosilicate glasses can be tempered much better than comparable borosilicate glasses of the state of the art.

Description

technical field [0001] The present invention relates to a borosilicate glass article with optimized resistance to hydrolysis, acid and alkali and easy chemical toughening. The invention also relates to a method of using the product, and the tempering method is used as a packaging product in the pharmaceutical field. Background technique [0002] Glass used for glassware in the medical field, especially pharmaceuticals, must meet strict quality standards. Articles Pharmaceutical primary packaging for pharmaceutical packaging such as vials, ampoules, cartridges and syringes must have high transparency, good sterilizable properties, high mechanical resistance, low porosity and permeability, and high chemical resistance. [0003] Glass compositions for medical use, in particular pharmaceutical use, have to meet high requirements, since glass is often in direct contact with solid and / or liquid materials, such as pharmaceutical compositions. The glass must not alter the mass of ...

AI Technical Summary

Problems solved by technology

However, the borosilicate glasses known from the prior art have the disadvantage that they cannot be tempered like aluminosilicate glasses, for example

However, it is not possible to use aluminosilicate glass instead of borosilicate glass because aluminosilicate glass generally provides poor hydrolysis resistance

Another disadvantage of aluminosilicate glasses is the undesired release of large quantities of aluminum ions into materials with which they come into contact (e.g. pharmaceutical compositions) under storage or preservation conditions

Also, aluminosilicate glass requires a higher melting temperature and is therefore much more expensive to manufacture

[0039] Despite the efforts made to design superior borosilicate glasses for pharmaceutical applications, the susceptibility to chemical toughening of borosilicate glasses in the prior art is insufficient

On the other hand, glass with good susceptibility to chemical toughening is deficient in chemical resistance

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