BAF4 by Schott

Obsolete Unknown Environmentally Dangerous

BAF4 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.50 µm with an nd of 1.605621 and a Vd of 43.929699. It has medium thermal expansion (CTE of 7.9×10⁻⁶/K), good chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.334–2.500 µm
Optical Properties
Refractive Index (nd) 1.605621
Abbe Number (Vd) 43.929699
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.37493\,\lambda^2}{\lambda^2 - 0.00929554} + \frac{0.146354\,\lambda^2}{\lambda^2 - 0.0440427} + \frac{0.912643\,\lambda^2}{\lambda^2 - 116.608}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.9
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.36 \times 10^{-7} + 2(1.49 \times 10^{-8})\,\Delta T + 3(-3.89 \times 10^{-11})\,\Delta T^2 + \frac{7.92 \times 10^{-7} + 2(-2.05 \times 10^{-11})\,\Delta T}{\lambda - 0.228}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.5
Relative Cost 2.25
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 1
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
C06-44 Corning 1.605608 43.942859
BAF4 Sumita 1.60562 43.9
BAF5 CDGM 1.605623 43.890292
BAF4 Hoya 1.60562 43.87626
H-BAF5 CDGM 1.60562 43.875621
M-BAF41 Hoya 1.605777 43.98709
BAM4 Ohara 1.60562 43.723021
S-BAM4 Ohara 1.60562 43.706978
TF3 CDGM 1.612423 44.093486
BPM4 Ohara 1.6134 43.841533
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-BAF4 Schott 1.60568 43.72
KZFS1 Schott 1.613099 44.339473
KZFSN4 Schott 1.6134 44.29
N-KZFS4HT Schott 1.61336 44.49
N-KZFS4 Schott 1.61336 44.49
BAF52 Schott 1.608589 46.44241
N-BAF52 Schott 1.60863 46.6
KZFSN9 Schott 1.598557 46.903842
BAF8 Schott 1.62374 47.000909
BAF3 Schott 1.58267 46.469988
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