SFLDN3 by Sumita

Obsolete Very Rare Environmentally Dangerous

SFLDN3 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 1.84666 and a Vd of 23.9. 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) 1.84666
Abbe Number (Vd) 23.9
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.25749 - 0.0164037\,\lambda^2 + 0.0442719\,\lambda^{-2} + 0.00416624\,\lambda^{-4} - 0.000314258\,\lambda^{-6} + 3.92908 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 10.7
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) 3.45
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
PBH53W Ohara 1.846658 23.885544
PBH53 Ohara 1.846658 23.885544
S-NPH53 Ohara 1.84666 23.88395
FDS90-SGP Hoya 1.84666 23.84
SF57 Schott 1.84666 23.83
SF57HT Schott 1.84666 23.83
SF57HTultra Schott 1.84666 23.83
ZF52 CDGM 1.846669 23.827549
FDS9 Hoya 1.846658 23.826345
H-ZF52A CDGM 1.84667 23.791236
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SFN3 Sumita 1.84666 23.9
K-SFLDn3 Sumita 1.8467 23.8
K-SFLDn3W Sumita 1.8467 23.8
K-PSFn4 Sumita 1.844 24.8
K-PSFn3 Sumita 1.83917 23.9
K-PSFn4(M) Sumita 1.83932 24.8
K-PSFn3(M) Sumita 1.83352 24.0
K-PSFn185 Sumita 1.8507 26.9
K-PSFn185(M) Sumita 1.84524 27.1
SFLD20 Sumita 1.81786 23.7
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