Method for producing borosilicate glasses

摘要

The invention relates to a method for producing borosilicate glasses of hydrolytic class 1, consisting of the following steps; preparing the mixture by adding at least one refining agent, insertion of the glass batch, melting the glass and subsequently heat forming the melted glass, whereby 0.01 wt.-%-0.8 wt.-% of one of more sulphates in the form of SO3 are added to the glass mixture.