LAFN8 by Sumita

Obsolete Very Rare Environmentally Dangerous

LAFN8 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.32 to 2.00 µm with an nd of 1.756 and a Vd of 47.6. It has average 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.756
Abbe Number (Vd) 47.6
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.00923 - 0.0110743\,\lambda^2 + 0.0266778\,\lambda^{-2} - 8.96519 \times 10^{-5}\,\lambda^{-4} + 7.26194 \times 10^{-5}\,\lambda^{-6} - 2.24553 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.4
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) 4.07
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
H-LAF6LA CDGM 1.757 47.711817
NBF2 Hoya 1.756999 47.712499
LAM54 Ohara 1.756998 47.815604
S-LAM54 Ohara 1.756998 47.82317
LAFN24 Schott 1.757191 47.81177
S-LAH96 Ohara 1.76385 48.488692
L-LAH91 Ohara 1.7645 49.096913
P-LAF37 Schott 1.7555 45.66
L-LAH87 Ohara 1.7703 47.401904
D-LAF050-25 CDGM 1.76709 49.197491
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-VC82 Sumita 1.7555 45.6
VC81 Sumita 1.75512 45.6
K-LaFK50T(M) Sumita 1.76209 49.6
K-VC82(M) Sumita 1.75028 45.4
K-LaFn5 Sumita 1.743 49.2
LAFN5 Sumita 1.743 49.2
K-VC174 Sumita 1.7485 45.3
K-LaFK50T Sumita 1.766 49.8
K-LaFK50(M) Sumita 1.76831 49.7
K-VC174(M) Sumita 1.74578 45.1
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