Reground glass edges: Thermally tempered glass with reground edges

Objectives and work programme

German construction law stipulates that edge finishing is not permitted on thermally tempered glass. During the tempering process, it can often occur that the ground edge of the glass can splinter off or can cause the edges to become misaligned in laminated safety glass made from thermally tempered glazing. This can result in insufficient optical quality at the glass edges. By regrinding the edges, a completely even surface can be achieved, which significantly increases the optical quality of the glass edges. In thermally tempered glazing, this can also reduce the compressive pre-stress applied. This loss of strength can only be compensated for by increasing the edge quality with small surface defects.

The objective of the cooperative project is to develop a grinding process that ensures that the strength required by construction standards is present in thermally tempered glazing. This development is a process involving many steps, whereby the individual influential parameters and dependencies are considered, assessed and selected. The process is intended to allow particularly promising and high-quality products with perfectly ground glass edges to be developed, manufactured and verified, especially for use in the field of interior construction.

Partner

Glaswerkstätten Frank Ahne GmbH, Pirna