Recommended
n_is_absolute: false
λ_is_vacuum: false
temperature: 25.0 °C
coefficients_of_thermal_dispersion: 3.5e-07 1.22e-08 -3.26e-11 5.94e-07 6.22e-10 0.141
n_d: 1.638539
V_d: 55.380028
glass_code: 639554
glass_status: standard
density: 3.69 g/cm3
coefficient_of_thermal_expansion_1: 7e-06 K-1
coefficient_of_thermal_expansion_2: 8.4e-06 K-1
ΔP_gF: -0.0035
climatic_resistance: 2.0
acid_resistance: 51.2
phosphate_resistance: 2.0
1) OHARA optical glass datasheets 2015-12-01
2) OHARA Zemax catalog 2015-12-01
Ohara Group is an international group of companies with headquarters in Japan and subsidiaries in Japan (Ohara, Inc.), United States (Ohara Corporation), and Germany (Ohara, GmbH). Ohara manufactures optical and electronic products and also offers measurement services, in particular measurement of refractive indices of solids and liquids.