BAK2 by Sumita

Obsolete Very Rare Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.53996
Abbe Number (Vd) 59.7
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.33626 - 0.00830604\,\lambda^2 + 0.0127959\,\lambda^{-2} + 8.11441 \times 10^{-5}\,\lambda^{-4} + 1.59374 \times 10^{-5}\,\lambda^{-6} - 6.01814 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.2
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) 2.86
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
BAK2 Schott 1.53996 59.708588
N-BAK2 Schott 1.53996 59.71
BAC2 Hoya 1.539961 59.721586
H-BAK2 CDGM 1.53996 59.724182
B39-59 Corning 1.539505 59.712433
S-BAL12 Ohara 1.539956 59.462478
BAL12 Ohara 1.539955 59.454008
H-BAK1 CDGM 1.53028 60.466139
ZNC1 Hoya 1.533149 58.063515
BACL1 Hoya 1.526417 60.113677
Similar Glasses (Sumita)
Glass Manufacturer nd Vd
KN1 Sumita 1.524 59.3
K5 Sumita 1.52249 59.6
K-SKLD300(M) Sumita 1.56124 60.1
BALK3 Sumita 1.51835 60.3
K-PSK11(M) Sumita 1.55985 61.0
K-PG375(M) Sumita 1.53922 62.7
K3 Sumita 1.51823 59.0
SK20 Sumita 1.55963 61.2
K-PBK60(M) Sumita 1.52483 62.0
K-PBK60 Sumita 1.5274 62.3
Compare Glasses
    Compare Selected