SFLD6 by Sumita

Obsolete Very Rare Environmentally Dangerous

SFLD6 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 1.80518 and a Vd of 25.4. 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) 1.80518
Abbe Number (Vd) 25.4
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.12437 - 0.0151933\,\lambda^2 + 0.039498\,\lambda^{-2} + 0.00344815\,\lambda^{-4} - 0.00024093\,\lambda^{-6} + 2.95238 \times 10^{-5}\,\lambda^{-8}}$$
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) 3.4
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
SFL6 Schott 1.80518 25.39
S-TIH6 Ohara 1.805181 25.425363
SF6HT Schott 1.80518 25.43
SF6 Schott 1.80518 25.43
TIH6 Ohara 1.805181 25.432057
PBH6 Ohara 1.805177 25.435012
PBH6W Ohara 1.805177 25.435012
N-SF6HT Schott 1.80518 25.36
N-SF6HTultra Schott 1.80518 25.36
N-SF6 Schott 1.80518 25.36
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-SFLD6 Sumita 1.80518 25.4
SF6 Sumita 1.80518 25.5
SF6W Sumita 1.80518 25.5
SFLD60 Sumita 1.80645 24.4
K-CD180 Sumita 1.80645 24.4
K-CD180(M) Sumita 1.79912 24.7
SFLD66 Sumita 1.79925 24.6
K-SFLD66 Sumita 1.79925 24.6
SFLD20 Sumita 1.81786 23.7
SF11W Sumita 1.78472 25.7
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