SF13 by Schott

Obsolete Unknown Environmentally Dangerous

SF13 by Schott is an obsolete optical glass. It transmits from 0.38 to 2.33 µm with an nd of 1.740771 and a Vd of 27.59998. It has medium thermal expansion (CTE of 7.1×10⁻⁶/K), excellent chemical resistance, moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.380–2.325 µm
Optical Properties
Refractive Index (nd) 1.740771
Abbe Number (Vd) 27.59998
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.65583\,\lambda^2}{\lambda^2 - 0.0131676} + \frac{0.257423\,\lambda^2}{\lambda^2 - 0.0604328} + \frac{1.09217\,\lambda^2}{\lambda^2 - 116.322}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.1
TCE 100/300°C (10-6/K) 8.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.85 \times 10^{-6} + 2(1.64 \times 10^{-8})\,\Delta T + 3(-5.38 \times 10^{-11})\,\Delta T^2 + \frac{1.32 \times 10^{-6} + 2(1.37 \times 10^{-9})\,\Delta T}{\lambda - 0.273}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.36
Relative Cost 3.03
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SF13 Sumita 1.74077 27.7
E-FD13 Hoya 1.74077 27.76
H-ZF50 CDGM 1.74077 27.760063
FD13 Hoya 1.740774 27.764991
ZF50 CDGM 1.74077 27.76788
S-TIH13 Ohara 1.740769 27.789359
PBH13 Ohara 1.740769 27.793228
PBH13W Ohara 1.740769 27.793228
D40-28 Corning 1.740001 28.102623
SF3 Sumita 1.74 28.2
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF54 Schott 1.7408 28.090813
SF3 Schott 1.74 28.2
SF63 Schott 1.7484 27.713565
SF10 Schott 1.72825 28.41
N-SF10 Schott 1.72828 28.53
SF4 Schott 1.7552 27.58
N-SF4 Schott 1.75513 27.38
SFL4 Schott 1.7552 27.206054
SF53 Schott 1.728301 28.68667
SF55 Schott 1.7618 26.950177
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