N-BASF2 by Schott

Preferred Unknown Environmentally Friendly

N-BASF2 by Schott is a preferred optical glass. It transmits from 0.37 to 2.50 µm with an nd of 1.66446 and a Vd of 36.0. It has medium thermal expansion (CTE of 7.12×10⁻⁶/K), excellent chemical resistance, and low relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.37–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.37–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.66446
Abbe Number (Vd) 36.0
Dispersion Formula Sellmeier
Wavelength Range 0.37 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.53652\,\lambda^2}{\lambda^2 - 0.0108436} + \frac{0.156971\,\lambda^2}{\lambda^2 - 0.0562279} + \frac{1.30197\,\lambda^2}{\lambda^2 - 131.34}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.12
TCE 100/300°C (10-6/K) 8.13
Thermal Conductivity (W/mK) 0.94
Heat Capacity (J/gK) 0.66
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.89 \times 10^{-6} + 2(1.22 \times 10^{-8})\,\Delta T + 3(-1.61 \times 10^{-11})\,\Delta T^2 + \frac{7.77 \times 10^{-7} + 2(9.96 \times 10^{-10})\,\Delta T}{\lambda - 0.256}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.151
Relative Cost 1.7
Mechanical Properties
Young's Modulus (GPa) 84.0
Poisson's Ratio 0.25
Knoop Hardness (kgf/mm²) 580.0
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
BASF2 Sumita 1.66446 35.9
BAFD2 Hoya 1.664457 35.887705
BAH22 Ohara 1.664459 35.812757
H-ZBAF4 CDGM 1.66426 35.484251
K-PG395 Sumita 1.658 36.9
K-PSFn166 Sumita 1.663 34.4
K-PG395(M) Sumita 1.65296 36.8
K-PSFn166(M) Sumita 1.65858 34.4
ADF405 Hoya 1.6765 37.477902
BPH40 Ohara 1.676498 37.537388
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
BASF2 Schott 1.66446 35.829357
BASF56 Schott 1.657149 36.735021
KZFS7A Schott 1.68064 37.389991
SF9 Schott 1.654461 33.651384
N-SF19 Schott 1.66679 33.12
SF19 Schott 1.6668 33.005581
SF12 Schott 1.64831 33.841187
SF2 Schott 1.64769 33.85
N-SF2 Schott 1.64769 33.82
SF16 Schott 1.646112 34.049815
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