BAL7 by Ohara

Obsolete Unknown Environmentally Dangerous

BAL7 by Ohara is an obsolete optical glass. It transmits from 0.32 to 0.90 µm with an nd of 1.58875 and a Vd of 51.179278. It has medium thermal expansion (CTE of 7.5×10⁻⁶/K), average chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.4 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.4 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.320–0.900 µm
Optical Properties
Refractive Index (nd) 1.58875
Abbe Number (Vd) 51.179278
Dispersion Formula Schott
Wavelength Range 0.3 — 2.4 µm
$$n(\lambda) = \sqrt{2.47872 - 0.00858563\,\lambda^2 + 0.01521\,\lambda^{-2} + 0.000604403\,\lambda^{-4} - 3.89364 \times 10^{-5}\,\lambda^{-6} + 2.71243 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.5
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.871 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.18
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance —
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance 2
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BALF50 Schott 1.588931 51.371228
BAFL6 Hoya 1.589036 52.935166
BALF6 Sumita 1.58904 53.2
LAF50 Hoya 1.60199 50.21
C0550 Corning 1.605004 50.419332
C05-50 Corning 1.605004 50.419332
BAFL2 Hoya 1.570989 50.858935
BAF6 Hoya 1.589003 48.543984
KZFS6 Schott 1.591965 48.509579
BAFN6 Schott 1.589 48.45
Similar Glasses (Ohara)
Glass Manufacturer nd Vd Compare
S-BAL2 Ohara 1.570989 50.799858
BAL2 Ohara 1.570989 50.797474
S-BAL3 Ohara 1.571351 52.952106
BAL3 Ohara 1.571351 52.968158
BAM5 Ohara 1.607289 49.188575
BSM23 Ohara 1.614839 51.172377
BSM28 Ohara 1.617722 49.83232
S-BSM28 Ohara 1.617722 49.815052
BSM21 Ohara 1.617196 54.040511
S-BSM21 Ohara 1.617195 54.062144
Compare Glasses
    Compare Selected