Clear borosilicate glass, hydrolytic class 1, with excellent chemical resistance. Thickness No. 1 (0.13 to 0.17 mm). Refractive index ne = 1.52 ± 0.01, Abbe number ve = 56.5 ± 0.5. Full automatic production guarantees "ready-for-use" quality - clean, dust and grease free, distortion-free, flatness within ± 3 µm. Clear borosilicate glass, hydrolytic class 1, with excellent chemical resistance. Thickness No. 1 (0.13 to 0.17 mm). Refractive index ne = 1.52 ± 0.01, Abbe number ve = 56.5 ± 0.5. Full automatic production guarantees "ready-for-use" quality - clean, dust and grease free, distortion-free, flatness within ± 3 µm.