BAF4 by CDGM

Obsolete Rare Environmentally Dangerous

BAF4 by CDGM is an obsolete optical glass with a rare melt frequency. It transmits from 0.32 to 2.40 µm with an nd of 1.582712 and a Vd of 46.505886. It has medium thermal expansion (CTE of 7.8×10⁻⁶/K), moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–0.7065 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–0.7065 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–2.400 µm
Optical Properties
Refractive Index (nd) 1.582712
Abbe Number (Vd) 46.505886
Dispersion Formula Schott
Wavelength Range 0.365 — 0.7065 µm
$$n(\lambda) = \sqrt{2.45147 - 0.00651189\,\lambda^2 + 0.0193773\,\lambda^{-2} - 0.000306376\,\lambda^{-4} + 0.00010175\,\lambda^{-6} - 3.92704 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.8
TCE 100/300°C (10-6/K) 9.1
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) 3.28
Relative Cost 4.5
Mechanical Properties
Young's Modulus (GPa) 64.77
Poisson's Ratio 0.237
Knoop Hardness (kgf/mm²) 442.0
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
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
N-BAF3 Schott 1.58272 46.64
BAFN6 Schott 1.589 48.45
KZFSN9 Schott 1.598557 46.903842
BAF6 Hoya 1.589003 48.543984
KZFS6 Schott 1.591965 48.509579
Similar Glasses (CDGM)
Glass Manufacturer nd Vd Compare
H-BAF4 CDGM 1.58267 46.597786
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
TF3 CDGM 1.612423 44.093486
QF1 CDGM 1.5481 45.886233
Compare Glasses
    Compare Selected