What is the “flatness” of Glass B (BOROFLOAT® 33)?
There are several ways to measure glass flatness. 1. SCHOTT Nexterion® defines “flatness” as the accumulated overall possible thickness deviation. Nexterion® slides have a maximum total “flatness” deviation of ≤ 25 µm for these three factors (warp, intra-slide thickness deviation, and inter-slide thickness tolerance) combined. 2. A project to measure the flatness deviation of individual Glass B Slides (75.6 x 25 mm) using Interferrometry, showed that the flatness deviation across a slide is ≤ 5 µm. For additional information please download a presentation here.
