BAF21 by Hoya

Obsolete Unknown Environmentally Dangerous

BAF21 by Hoya is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.66422 and a Vd of 48.941939. 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) 1.66422
Abbe Number (Vd) 48.941939
Dispersion Formula Schott
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{2.7105 - 0.00828562\,\lambda^2 + 0.0206084\,\lambda^{-2} + 0.000171484\,\lambda^{-4} + 3.70714 \times 10^{-5}\,\lambda^{-6} - 7.17491 \times 10^{-7}\,\lambda^{-8}}$$
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
BAFN3 Sumita 1.66422 49.2
K-BaFn3 Sumita 1.66422 49.2
C67-48 Corning 1.666698 48.434395
H-ZBAF16 CDGM 1.66672 48.421731
BAFN11 Schott 1.666721 48.421391
BAF11 Sumita 1.66672 48.4
S-BAH11 Ohara 1.666718 48.325247
BAH11 Ohara 1.666718 48.317266
CALCITE Generic Birefringent 1.658643 48.541403
CALCITE Generic IR 1.658643 48.541403
Similar Glasses (Hoya)
Glass Manufacturer nd Vd Compare
BAF11 Hoya 1.66672 48.3
BAF10 Hoya 1.67003 47.2
BACED5 Hoya 1.65844 50.86
LACL9 Hoya 1.6779 50.551353
LAFL20 Hoya 1.68248 48.197606
LACL4 Hoya 1.669603 51.65903
LAFL1 Hoya 1.686004 49.347081
BAF9 Hoya 1.643278 47.941673
LAFL23 Hoya 1.689 49.475821
BAF13 Hoya 1.668916 44.911265
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