N-BALF5 by Schott

Preferred Unknown Environmentally Friendly

N-BALF5 by Schott is a preferred optical glass. It transmits from 0.35 to 2.50 µm with an nd of 1.54739 and a Vd of 53.63. It has medium thermal expansion (CTE of 7.34×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.35–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.35–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.350–2.500 µm
Optical Properties
Refractive Index (nd) 1.54739
Abbe Number (Vd) 53.63
Dispersion Formula Sellmeier
Wavelength Range 0.35 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.28386\,\lambda^2}{\lambda^2 - 0.00825816} + \frac{0.0719301\,\lambda^2}{\lambda^2 - 0.044192} + \frac{1.05049\,\lambda^2}{\lambda^2 - 107.097}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.34
TCE 100/300°C (10-6/K) 8.43
Thermal Conductivity (W/mK) 1.05
Heat Capacity (J/gK) 0.81
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.14 \times 10^{-6} + 2(1.29 \times 10^{-8})\,\Delta T + 3(-1.46 \times 10^{-11})\,\Delta T^2 + \frac{5.02 \times 10^{-7} + 2(5.87 \times 10^{-10})\,\Delta T}{\lambda - 0.219}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.614
Relative Cost 3.1
Mechanical Properties
Young's Modulus (GPa) 81.0
Poisson's Ratio 0.21
Knoop Hardness (kgf/mm²) 600.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BALF5 Sumita 1.54739 53.6
BAL5 Ohara 1.547393 53.550738
B48-53 Corning 1.547753 53.492251
BPG2 Sumita 1.5592 53.9
K-BPG2 Sumita 1.5592 53.9
B58-53 Corning 1.557511 52.533062
ADF1 Hoya 1.564997 52.958253
H-K12 CDGM 1.533589 55.469983
IRG15 Generic IR 1.534275 55.700357
KF4 Sumita 1.53358 51.6
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BALF5 Schott 1.547391 53.629486
N-KZFS2 Schott 1.55836 54.01
KZFSN2 Schott 1.558361 54.157173
KZFN2 Schott 1.52944 51.626811
D263TECO Schott 1.523303 54.5172
N-BAK4HT Schott 1.56883 55.98
N-BAK4 Schott 1.56883 55.98
BAK4 Schott 1.56883 56.130661
N-KF9 Schott 1.52346 51.54
KF9 Schott 1.523412 51.492996
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