S-BAL50 by Ohara

Special Unknown Environmentally Friendly

S-BAL50 by Ohara is a special optical glass. It transmits from 0.30 to 0.70 µm with an nd of 1.559625 and a Vd of 61.172671. It has medium thermal expansion (CTE of 7.5×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–0.700 µm
Optical Properties
Refractive Index (nd) 1.559625
Abbe Number (Vd) 61.172671
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.39827 - 0.0102228\,\lambda^2 + 0.0121104\,\lambda^{-2} + 0.000377676\,\lambda^{-4} - 2.7339 \times 10^{-5}\,\lambda^{-6} + 1.57019 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.5
TCE 100/300°C (10-6/K) 9.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.64 \times 10^{-6} + 2(1.93 \times 10^{-8})\,\Delta T + 3(4.39 \times 10^{-12})\,\Delta T^2 + \frac{5.12 \times 10^{-7} + 2(8.07 \times 10^{-10})\,\Delta T}{\lambda - 0.162}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.74
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SK20 Sumita 1.55963 61.2
K-PSK11(M) Sumita 1.55985 61.0
B64-61 Corning 1.564005 60.964853
BACD11 Hoya 1.56384 60.83
SK11 Sumita 1.56384 60.8
N-SK11 Schott 1.56384 60.8
SK11 Schott 1.56384 60.798869
H-BAK6 CDGM 1.56388 60.764747
K-PSK11 Sumita 1.5658 61.0
P-SK11 Sumita 1.5658 61.0
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
BAL50 Ohara 1.559625 61.172671
BAL41 Ohara 1.563839 60.695914
L-PHL1 Ohara 1.56455 60.818065
S-BAL41 Ohara 1.563839 60.666575
L-PHL2 Ohara 1.5588 62.558541
S-BAL22 Ohara 1.568729 63.10486
BAL22 Ohara 1.568729 63.162358
BAL15 Ohara 1.556711 58.689461
BAL15Y Ohara 1.556711 58.679177
S-BAL12 Ohara 1.539956 59.462478
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