Borosilicate glass, DIN ISO 8255. Refractive index ne = 1.52 ± 0.01, Abbe number ve = 56.5 ± 0.5. Flatness tolerance ± 3 µm. They differ from ordinary cover glasses by their plain ground and polished surface. Packing: 2 cover glasses in a plastic bag, separated by tissue paper. Borosilicate glass, DIN ISO 8255. Refractive index ne = 1.52 ± 0.01, Abbe number ve = 56.5 ± 0.5. Flatness tolerance ± 3 µm. They differ from ordinary cover glasses by their plain ground and polished surface. Packing: 2 cover glasses in a plastic bag, separated by tissue paper.