F8 by Sumita

Obsolete Very Rare Environmentally Dangerous

F8 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 1.59551 and a Vd of 39.2. 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: 0.320–2.000 µm
Optical Properties
Refractive Index (nd) 1.59551
Abbe Number (Vd) 39.2
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.485 - 0.00880817\,\lambda^2 + 0.0200545\,\lambda^{-2} + 0.000684138\,\lambda^{-4} - 1.56486 \times 10^{-5}\,\lambda^{-6} + 3.36766 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.4
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) 3.38
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
PBM8 Ohara 1.595508 39.213424
E-F8 Hoya 1.59551 39.22
F8 Schott 1.59551 39.179444
F8HT Schott 1.59551 39.179444
F8 Hoya 1.595514 39.221686
H-QF14 CDGM 1.59551 39.222748
S-TIM8 Ohara 1.595509 39.242273
PBM8Y Ohara 1.595509 39.260208
PBM18Y Ohara 1.595509 38.767114
LF5G19 Schott 1.59655 39.89
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
F5 Sumita 1.60342 38.0
BASF3 Sumita 1.60717 40.2
LF2 Sumita 1.58921 41.0
LF5 Sumita 1.58144 40.8
F3 Sumita 1.61293 36.9
LF3 Sumita 1.58215 42.0
LF4 Sumita 1.57845 41.7
BASF5 Sumita 1.60323 42.5
K-BaSF5 Sumita 1.60323 42.5
LF7 Sumita 1.57501 41.3
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