SFN1 by Sumita

Obsolete Very Rare Environmentally Dangerous

SFN1 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.33 to 2.00 µm with an nd of 1.72022 and a Vd of 29.3. It has good 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: 0.330–2.000 µm
Optical Properties
Refractive Index (nd) 1.72022
Abbe Number (Vd) 29.3
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.85556 - 0.0102829\,\lambda^2 + 0.0317191\,\lambda^{-2} + 0.00204308\,\lambda^{-4} - 0.000119621\,\lambda^{-6} + 1.44857 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.8
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) 4.49
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FD20 Hoya 1.720225 29.300359
SF18 Schott 1.72151 29.245495
PBH18 Ohara 1.721506 29.243262
FD18 Hoya 1.721507 29.243436
S-TIH18 Ohara 1.721507 29.23233
P-SF69 Schott 1.7225 29.23
D17-29 Corning 1.717409 29.492751
H-ZF3 CDGM 1.71736 29.49911
E-FD1L Hoya 1.71736 29.5
E-FD1 Hoya 1.71736 29.5
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SF18 Sumita 1.72151 29.3
K-CD120 Sumita 1.7225 29.2
CD120 Sumita 1.7225 29.2
SF1 Sumita 1.71736 29.5
K-SFLD1 Sumita 1.71736 29.5
K-CD120(M) Sumita 1.71466 29.6
SF10 Sumita 1.72825 28.3
SF10W Sumita 1.72825 28.3
SF3 Sumita 1.74 28.2
SF15 Sumita 1.69895 30.0
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