F8HT by Schott

Obsolete Unknown Environmentally Dangerous

F8HT by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.59551 and a Vd of 39.179444. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), good chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.59551
Abbe Number (Vd) 39.179444
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.31172\,\lambda^2}{\lambda^2 - 0.00965178} + \frac{0.17248\,\lambda^2}{\lambda^2 - 0.0461712} + \frac{0.840159\,\lambda^2}{\lambda^2 - 100.047}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.3
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 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 2
Notes

old, High UV Transmission; glass data moved from former "I_LINE" catalog

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
F8 Sumita 1.59551 39.2
PBM8 Ohara 1.595508 39.213424
E-F8 Hoya 1.59551 39.22
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
C04-38 Corning 1.603499 38.110538
S-TIM5 Ohara 1.60342 38.027347
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
F8 Schott 1.59551 39.179444
LF5G19 Schott 1.59655 39.89
F14HT Schott 1.601389 38.266237
F14 Schott 1.601401 38.231923
F5 Schott 1.60342 38.03
F15 Schott 1.605651 37.830856
LF5G15 Schott 1.58397 40.83
N-LF5 Schott 1.58144 40.848909
LF5 Schott 1.58144 40.85
LF5HTi Schott 1.58144 40.89
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