N-BAF4 by Schott

Preferred Unknown Environmentally Friendly

N-BAF4 by Schott is a preferred optical glass. It transmits from 0.36 to 2.50 µm with an nd of 1.60568 and a Vd of 43.72. It has medium thermal expansion (CTE of 7.24×10⁻⁶/K), excellent chemical resistance, and low relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.365–2.500 µm
Optical Properties
Refractive Index (nd) 1.60568
Abbe Number (Vd) 43.72
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.42056\,\lambda^2}{\lambda^2 - 0.00942015} + \frac{0.102721\,\lambda^2}{\lambda^2 - 0.0531087} + \frac{1.14381\,\lambda^2}{\lambda^2 - 110.279}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.24
TCE 100/300°C (10-6/K) 8.29
Thermal Conductivity (W/mK) 1.02
Heat Capacity (J/gK) 0.74
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.39 \times 10^{-7} + 2(1.24 \times 10^{-8})\,\Delta T + 3(-9 \times 10^{-12})\,\Delta T^2 + \frac{6.17 \times 10^{-7} + 2(8.42 \times 10^{-10})\,\Delta T}{\lambda - 0.242}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.889
Relative Cost 1.5
Mechanical Properties
Young's Modulus (GPa) 85.0
Poisson's Ratio 0.23
Knoop Hardness (kgf/mm²) 610.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BAM4 Ohara 1.60562 43.723021
S-BAM4 Ohara 1.60562 43.706978
H-BAF5 CDGM 1.60562 43.875621
BAF4 Hoya 1.60562 43.87626
BAF5 CDGM 1.605623 43.890292
BAF4 Sumita 1.60562 43.9
C06-44 Corning 1.605608 43.942859
M-BAF41 Hoya 1.605777 43.98709
TF3 CDGM 1.612423 44.093486
KZFS4 Sumita 1.6134 43.8
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BAF4 Schott 1.605621 43.929699
KZFS1 Schott 1.613099 44.339473
KZFSN4 Schott 1.6134 44.29
N-KZFS4 Schott 1.61336 44.49
N-KZFS4HT Schott 1.61336 44.49
BAF52 Schott 1.608589 46.44241
N-BAF52 Schott 1.60863 46.6
KZFSN9 Schott 1.598557 46.903842
LF5G19 Schott 1.59655 39.89
BAF8 Schott 1.62374 47.000909
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