SF13 by Sumita

Obsolete Very Rare Environmentally Dangerous

SF13 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.37 to 2.00 µm with an nd of 1.74077 and a Vd of 27.7. It has excellent chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.000 µm
Optical Properties
Refractive Index (nd) 1.74077
Abbe Number (Vd) 27.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.91922 - 0.0119633\,\lambda^2 + 0.0329964\,\lambda^{-2} + 0.00273629\,\lambda^{-4} - 0.000204752\,\lambda^{-6} + 2.31814 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.5
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.4
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
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
SF13 Schott 1.740771 27.59998
SF54 Schott 1.7408 28.090813
D40-28 Corning 1.740001 28.102623
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SF3 Sumita 1.74 28.2
SFN4 Sumita 1.7506 27.8
SF10 Sumita 1.72825 28.3
SF10W Sumita 1.72825 28.3
SF4W Sumita 1.7552 27.5
SF4 Sumita 1.7552 27.5
K-SFLD4 Sumita 1.7552 27.5
K-CD120 Sumita 1.7225 29.2
CD120 Sumita 1.7225 29.2
SF18 Sumita 1.72151 29.3
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