SFS3 by Sumita

Obsolete Very Rare Environmentally Dangerous

SFS3 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 1.7847 and a Vd of 26.2. 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: 0.370–2.000 µm
Optical Properties
Refractive Index (nd) 1.7847
Abbe Number (Vd) 26.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.05125 - 0.00905968\,\lambda^2 + 0.041805\,\lambda^{-2} + 0.00187152\,\lambda^{-4} - 3.314 \times 10^{-5}\,\lambda^{-6} + 1.47332 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.3
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) 4.9
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
PBH23 Ohara 1.784702 26.216753
PBH23W Ohara 1.784702 26.216753
S-TIH23 Ohara 1.784696 26.291221
FDS30 Hoya 1.784701 26.102957
TIH23 Ohara 1.784696 26.29817
N-SF56 Schott 1.7847 26.1
SF56A Schott 1.7847 26.08
SFL56 Schott 1.7847 26.078312
ZF51 CDGM 1.784701 26.075871
FDS3 Hoya 1.7847 26.057653
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SFLD11 Sumita 1.78472 25.9
K-SFLD11 Sumita 1.78472 25.9
SF11 Sumita 1.78472 25.7
SF11W Sumita 1.78472 25.7
K-CD180(M) Sumita 1.79912 24.7
K-SFLD66 Sumita 1.79925 24.6
SFLD66 Sumita 1.79925 24.6
SF6 Sumita 1.80518 25.5
SF6W Sumita 1.80518 25.5
K-SFLD6 Sumita 1.80518 25.4
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