N-SF6HTultra by Schott

Preferred Unknown Environmentally Friendly

N-SF6HTultra by Schott is a preferred optical glass. It transmits from 0.37 to 2.50 µm with an nd of 1.80518 and a Vd of 25.36. It has medium thermal expansion (CTE of 9.03×10⁻⁶/K), excellent chemical resistance, and moderate 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) 1.80518
Abbe Number (Vd) 25.36
Dispersion Formula Sellmeier
Wavelength Range 0.37 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.77932\,\lambda^2}{\lambda^2 - 0.0133714} + \frac{0.33815\,\lambda^2}{\lambda^2 - 0.0617534} + \frac{2.08734\,\lambda^2}{\lambda^2 - 174.018}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 9.03
TCE 100/300°C (10-6/K) 10.34
Thermal Conductivity (W/mK) 0.96
Heat Capacity (J/gK) 0.69
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.93 \times 10^{-6} + 2(7.02 \times 10^{-9})\,\Delta T + 3(-2.4 \times 10^{-11})\,\Delta T^2 + \frac{9.84 \times 10^{-7} + 2(1.54 \times 10^{-9})\,\Delta T}{\lambda - 0.29}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.369
Relative Cost 6.0
Mechanical Properties
Young's Modulus (GPa) 93.0
Poisson's Ratio 0.26
Knoop Hardness (kgf/mm²) 550.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
K-SFLD6 Sumita 1.80518 25.4
SFLD6 Sumita 1.80518 25.4
S-TIH6 Ohara 1.805181 25.425363
TIH6 Ohara 1.805181 25.432057
PBH6W Ohara 1.805177 25.435012
PBH6 Ohara 1.805177 25.435012
H-ZF7LAGT CDGM 1.80518 25.456256
H-ZF7LA CDGM 1.80518 25.456256
FD60-W Hoya 1.80518 25.46
FD60 Hoya 1.80518 25.46
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF6 Schott 1.80518 25.36
N-SF6HT Schott 1.80518 25.36
SFL6 Schott 1.80518 25.39
SF6HT Schott 1.80518 25.43
SF6 Schott 1.80518 25.43
SF6G05 Schott 1.80906 25.27
N-SF11 Schott 1.78472 25.68
SF11 Schott 1.78472 25.76
SFL56 Schott 1.7847 26.078312
SF56A Schott 1.7847 26.08
Compare Glasses
    Compare Selected