K-BaF8 by Sumita

Standard Rare Environmentally Friendly

K-BaF8 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.62374 and a Vd of 47.1. It has medium thermal expansion (CTE of 6.7×10⁻⁶/K) and good chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.62374
Abbe Number (Vd) 47.1
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.58306 - 0.0113197\,\lambda^2 + 0.0188175\,\lambda^{-2} + 0.000270633\,\lambda^{-4} + 2.15276 \times 10^{-5}\,\lambda^{-6} + 7.77619 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.7
TCE 100/300°C (10-6/K) 9.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[7.3 \times 10^{-7} + 2(1.78 \times 10^{-8})\,\Delta T + 3(-2.34 \times 10^{-10})\,\Delta T^2 + \frac{5.81 \times 10^{-7} + 2(1.81 \times 10^{-11})\,\Delta T}{\lambda - 0.234}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.02
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAM8 Ohara 1.62374 47.09722
BAF8 Hoya 1.623739 47.054197
E-BAF8 Hoya 1.62374 47.05
BAF8 Schott 1.62374 47.000909
C24-47 Corning 1.624 46.940278
N-BAF52 Schott 1.60863 46.6
BAF52 Schott 1.608589 46.44241
BAF7 Hoya 1.608013 46.212035
H-BAF6 CDGM 1.60801 46.202418
ZBAF2 CDGM 1.639616 48.230454
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
BAF8 Sumita 1.62374 47.1
K-LCV161(M) Sumita 1.61477 45.6
K-LCV161 Sumita 1.6182 45.3
BAF9 Sumita 1.64328 47.8
K-BaF9 Sumita 1.64328 47.8
SSK9 Sumita 1.62012 49.8
K-SSK9 Sumita 1.62012 49.8
BAF12 Sumita 1.6393 45.0
BAF5 Sumita 1.60729 49.3
K-SKLD310 Sumita 1.6042 48.9
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