BALF3 by Sumita

Obsolete Very Rare Environmentally Dangerous

BALF3 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.57135 and a Vd of 53.0. It has excellent chemical resistance and dangerous environmental properties.

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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.57135
Abbe Number (Vd) 53.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.42694 - 0.00877789\,\lambda^2 + 0.0145115\,\lambda^{-2} + 0.000425938\,\lambda^{-4} - 2.03069 \times 10^{-5}\,\lambda^{-6} + 1.70033 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.0
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) 3.15
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 Compare
BAFL3 Hoya 1.571348 52.982526
BAL3 Ohara 1.571351 52.968158
S-BAL3 Ohara 1.571351 52.952106
ADF1 Hoya 1.564997 52.958253
BAFL4 Hoya 1.579572 53.705963
BALF4 Schott 1.579569 53.708241
H-BAF3 CDGM 1.57957 53.711637
N-BALF4 Schott 1.57956 53.87
B58-53 Corning 1.557511 52.533062
N-KZFS2 Schott 1.55836 54.01
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-BPG2 Sumita 1.5592 53.9
BPG2 Sumita 1.5592 53.9
BALF6 Sumita 1.58904 53.2
BAK4 Sumita 1.56883 56.0
BALF5 Sumita 1.54739 53.6
K-CSK158(M) Sumita 1.58157 56.7
K-CSK158 Sumita 1.584 56.9
BAK1 Sumita 1.5725 57.5
BAF1 Sumita 1.5569 48.5
KF4 Sumita 1.53358 51.6
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