BAFL4 by Hoya

Obsolete Unknown Environmentally Dangerous

BAFL4 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.579572 and a Vd of 53.705963. It has 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

No transmission data available.

Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.579572
Abbe Number (Vd) 53.705963
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.45165 - 0.00826688\,\lambda^2 + 0.0150807\,\lambda^{-2} + 0.000335062\,\lambda^{-4} - 1.44772 \times 10^{-5}\,\lambda^{-6} + 1.56281 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) —
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) —
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance —
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BALF4 Schott 1.579569 53.708241
H-BAF3 CDGM 1.57957 53.711637
N-BALF4 Schott 1.57956 53.87
BALF3 Sumita 1.57135 53.0
BAL3 Ohara 1.571351 52.968158
S-BAL3 Ohara 1.571351 52.952106
BALF6 Sumita 1.58904 53.2
BALF50 Schott 1.588931 51.371228
N-BAK4HT Schott 1.56883 55.98
N-BAK4 Schott 1.56883 55.98
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
BAFL3 Hoya 1.571348 52.982526
BAFL6 Hoya 1.589036 52.935166
ADF1 Hoya 1.564997 52.958253
BAC6 Hoya 1.574441 56.357089
BAC4 Hoya 1.56883 56.04
ADC2 Hoya 1.596998 55.291198
BAFL2 Hoya 1.570989 50.858935
BAC1 Hoya 1.572497 57.488684
BACD50 Hoya 1.607 54.982971
BAF2 Hoya 1.56965 49.392725
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