H-BAF4 by CDGM

Standard Rare Environmentally Friendly

H-BAF4 by CDGM is a standard optical glass with a rare melt frequency. It transmits from 0.34 to 2.40 µm with an nd of 1.58267 and a Vd of 46.597786. It has medium thermal expansion (CTE of 8.2×10⁻⁶/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: 0.340–2.400 µm
Optical Properties
Refractive Index (nd) 1.58267
Abbe Number (Vd) 46.597786
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.32811\,\lambda^2}{\lambda^2 - 0.00868511} + \frac{0.126865\,\lambda^2}{\lambda^2 - 0.0440786} + \frac{1.04005\,\lambda^2}{\lambda^2 - 120.9}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 10.0
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.53 \times 10^{-6} + 2(1.58 \times 10^{-8})\,\Delta T + 3(-4.13 \times 10^{-11})\,\Delta T^2 + \frac{6.35 \times 10^{-7} + 2(4.85 \times 10^{-10})\,\Delta T}{\lambda - 0.235}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.91
Relative Cost 5.7
Mechanical Properties
Young's Modulus (GPa) 72.76
Poisson's Ratio 0.241
Knoop Hardness (kgf/mm²) 479.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
N-BAF3 Schott 1.58272 46.64
BAF3 Sumita 1.58267 46.5
BAF3 Schott 1.58267 46.469988
BAF3 Hoya 1.58267 46.462286
S-BAM3 Ohara 1.582673 46.423175
BAM3 Ohara 1.582673 46.423092
BAFN6 Schott 1.589 48.45
BAF6 Hoya 1.589003 48.543984
KZFSN9 Schott 1.598557 46.903842
KZFS6 Schott 1.591965 48.509579
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
BAF4 CDGM 1.582712 46.505886
BAF2 CDGM 1.569703 49.435926
H-BAF2 CDGM 1.5697 49.452646
H-BAF6 CDGM 1.60801 46.202418
BAF5 CDGM 1.605623 43.890292
H-BAF5 CDGM 1.60562 43.875621
H-QF56 CDGM 1.56732 42.810117
QF5 CDGM 1.582153 42.039634
QF1 CDGM 1.5481 45.886233
H-QF1 CDGM 1.54814 45.820011
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