K-BaSF5 by Sumita

Standard Rare Environmentally Friendly

K-BaSF5 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 1.60323 and a Vd of 42.5. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K) and average 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) 1.60323
Abbe Number (Vd) 42.5
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.51658 - 0.0118378\,\lambda^2 + 0.0176316\,\lambda^{-2} + 0.000958341\,\lambda^{-4} - 6.76239 \times 10^{-5}\,\lambda^{-6} + 6.25434 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.9
TCE 100/300°C (10-6/K) 10.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.33 \times 10^{-6} + 2(1.61 \times 10^{-8})\,\Delta T + 3(-2.3 \times 10^{-10})\,\Delta T^2 + \frac{5.78 \times 10^{-7} + 2(6.96 \times 10^{-10})\,\Delta T}{\lambda - 0.262}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.71
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAFD5 Hoya 1.603232 42.391075
BAM25 Ohara 1.60323 42.320943
BAFD16 Hoya 1.6 42.456745
GEO2 Generic IR 1.608459 41.728763
S-BAM4 Ohara 1.60562 43.706978
N-BAF4 Schott 1.60568 43.72
BAM4 Ohara 1.60562 43.723021
H-BAF5 CDGM 1.60562 43.875621
BAF4 Hoya 1.60562 43.87626
BAF5 CDGM 1.605623 43.890292
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
BASF5 Sumita 1.60323 42.5
BAF4 Sumita 1.60562 43.9
KZFS4 Sumita 1.6134 43.8
BASF3 Sumita 1.60717 40.2
LF2 Sumita 1.58921 41.0
LF3 Sumita 1.58215 42.0
LF5 Sumita 1.58144 40.8
LF4 Sumita 1.57845 41.7
K-LCV161 Sumita 1.6182 45.3
F8 Sumita 1.59551 39.2
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