In 1986, with the takeover of the safety glass works in Hildesheim, the Interpane product spectrum was extended to also include the manufacture of:
- tempered safety glass (ESG),
- heat-strengthened prestressed glass (TVG) and
- laminated safety glass (VSG).
These products are now all marketed under the brand name "ipasafe". With this diversification Interpane opened up the many varied possibilities of using glass in special structures, in interior room fittings, and in on-glass decoration.
German unification in 1990 offered Interpane, like many other enterprises, the unexpected prospect of new markets. In the early 1990s, with the establishment of new works in Belgern (in the German Federal State of Saxony) and Häsen (in Brandenburg), Interpane has made the most of these opportunities.