SF7 by Sumita

Obsolete Very Rare Environmentally Dangerous
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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.6398
Abbe Number (Vd) 34.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.6148 - 0.00988786\,\lambda^2 + 0.0232846\,\lambda^{-2} + 0.00138332\,\lambda^{-4} - 8.70504 \times 10^{-5}\,\lambda^{-6} + 8.88302 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.4
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) 3.78
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
E-FD7 Hoya 1.6398 34.57
FD7 Hoya 1.639803 34.568909
PBM27 Ohara 1.639799 34.477127
S-TIM27 Ohara 1.639799 34.466422
H-F51 CDGM 1.6398 34.46457
C37-35 Corning 1.636493 35.322642
F6 Hoya 1.636356 35.340304
F6 Schott 1.636359 35.341176
PBM6 Ohara 1.636358 35.376536
F7 CDGM 1.636365 35.386204
Similar Glasses (Sumita)
Glass Manufacturer nd Vd
F6 Sumita 1.63636 35.4
SF2 Sumita 1.64769 33.9
SF12 Sumita 1.64831 33.8
F1 Sumita 1.62588 35.6
SF9 Sumita 1.65446 33.8
K-PSFn166(M) Sumita 1.65858 34.4
K-PG395(M) Sumita 1.65296 36.8
K-PSFn166 Sumita 1.663 34.4
F2 Sumita 1.62004 36.3
K-PG395 Sumita 1.658 36.9
Compare Glasses
    Compare Selected