SF4W by Sumita

Obsolete Very Rare Environmentally Dangerous

SF4W by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.7552 and a Vd of 27.5. 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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.7552
Abbe Number (Vd) 27.5
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.96129 - 0.00971846\,\lambda^2 + 0.0367462\,\lambda^{-2} + 0.00212176\,\lambda^{-4} - 0.000106827\,\lambda^{-6} + 1.62875 \times 10^{-5}\,\lambda^{-8}}$$
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) 4.78
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-TIH4 Ohara 1.755199 27.512089
PBH4 Ohara 1.755199 27.512146
PBH4W Ohara 1.755199 27.512146
E-FD4L Hoya 1.7552 27.53
E-FD4 Hoya 1.7552 27.53
H-ZF6 CDGM 1.7552 27.530047
FD4 Hoya 1.755199 27.530242
ZF6 CDGM 1.755205 27.546239
SF4 Schott 1.7552 27.58
D56-27 Corning 1.755203 27.591377
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SF4 Sumita 1.7552 27.5
K-SFLD4 Sumita 1.7552 27.5
SFN4 Sumita 1.7506 27.8
SF14 Sumita 1.76182 26.5
K-SFLD14 Sumita 1.76182 26.5
SF13 Sumita 1.74077 27.7
SF3 Sumita 1.74 28.2
SF10 Sumita 1.72825 28.3
SF10W Sumita 1.72825 28.3
LAFN12 Sumita 1.7569 31.7
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