SCHOTT BOROFLOAT 33 glass is manufactured using the microfloat method, which produces flat glass sheets with a mirror-like surface quality. The flatness of glass sheets can be influenced by various parameters such as warp, bow, total thickness variation, thickness tolerance, and thickness deviation. For Nexterion Glass B slides, flatness is defined as the accumulated thickness deviation including warp, intra-slide thickness deviation, and inter-slide thickness tolerance, which is typically less than or equal to 25 μm combined. Measurement using interferometry shows that the typical flatness across a single 75.6 x 25 mm Nexterion Glass B slide is less than or equal to 5 μm. The surface microroughness of Glass B

1. SCHOTT BOROFLOAT 33 ® / Nexterion ® Glass B Flatness and Surface Quality

4. Bow and Warp

5. Total Thickness Variation (TTV)

7. Measurement of individual Glass B Slide Flatness using Interferrometry ZYGO's VeriFire™ XP/D Laser Fizeau mechanical phase-shifting interferometer

9. Surface MicroRoughness of Glass B Slides Measured using Digital instrument nanoScope Atomic Force Microscope (AFM)

11. More information is available at: http://www.schott.com/nexterion