H-F51 by CDGM

Standard Rare Environmentally Friendly

H-F51 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.36 to 2.40 µm with an nd of 1.6398 and a Vd of 34.46457. It has medium thermal expansion (CTE of 8.4×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.360–2.400 µm
Optical Properties
Refractive Index (nd) 1.6398
Abbe Number (Vd) 34.46457
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.1988\,\lambda^2}{\lambda^2 - 118.703} + \frac{0.146782\,\lambda^2}{\lambda^2 - 0.058692} + \frac{1.46655\,\lambda^2}{\lambda^2 - 0.0111709}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.4
TCE 100/300°C (10-6/K) 10.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.03 \times 10^{-6} + 2(1.5 \times 10^{-8})\,\Delta T + 3(-4.64 \times 10^{-11})\,\Delta T^2 + \frac{7.77 \times 10^{-7} + 2(8.08 \times 10^{-10})\,\Delta T}{\lambda - 0.275}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.76
Relative Cost 4.6
Mechanical Properties
Young's Modulus (GPa) 80.78
Poisson's Ratio 0.237
Knoop Hardness (kgf/mm²) 567.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-TIM27 Ohara 1.639799 34.466422
PBM27 Ohara 1.639799 34.477127
FD7 Hoya 1.639803 34.568909
E-FD7 Hoya 1.6398 34.57
SF7 Sumita 1.6398 34.6
SF16 Schott 1.646112 34.049815
C37-35 Corning 1.636493 35.322642
F6 Hoya 1.636356 35.340304
F6 Schott 1.636359 35.341176
PBM6 Ohara 1.636358 35.376536
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
F7 CDGM 1.636365 35.386204
H-ZF1A CDGM 1.64769 33.887993
H-ZF1 CDGM 1.64769 33.840317
ZF1 CDGM 1.647693 33.836872
ZF8 CDGM 1.65446 33.651201
H-F13 CDGM 1.62588 35.698971
F13 CDGM 1.625884 35.713679
F6 CDGM 1.624954 35.577816
H-F6 CDGM 1.62495 35.585173
H-F5 CDGM 1.62435 35.923444
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