UBK7 by Schott

Obsolete Unknown Environmentally Dangerous

UBK7 by Schott is an obsolete optical glass. It transmits from 0.30 to 2.33 µm with an nd of 1.516801 and a Vd of 64.289727. It has medium thermal expansion (CTE of 7.0×10⁻⁶/K), good chemical resistance, low relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.325 µm
Optical Properties
Refractive Index (nd) 1.516801
Abbe Number (Vd) 64.289727
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.01237\,\lambda^2}{\lambda^2 - 0.00588329} + \frac{0.258985\,\lambda^2}{\lambda^2 - 0.019024} + \frac{1.00022\,\lambda^2}{\lambda^2 - 104.08}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.0
TCE 100/300°C (10-6/K) 8.3
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.7 \times 10^{-6} + 2(1.34 \times 10^{-8})\,\Delta T + 3(-1.26 \times 10^{-11})\,\Delta T^2 + \frac{4.42 \times 10^{-7} + 2(5.15 \times 10^{-10})\,\Delta T}{\lambda - 0.167}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.51
Relative Cost 2.26
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 2
Phosphate Resistance 2
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
B16-64 Corning 1.516804 64.224234
BSL7Y Ohara 1.51633 64.243778
BSC7 Hoya 1.5168 64.2
H-K9L* CDGM 1.5168 64.198732
H-K9L CDGM 1.5168 64.198732
H-K9LGT CDGM 1.5168 64.198732
H-K9LA CDGM 1.5168 64.198695
H-K9LAGT CDGM 1.5168 64.198695
BSL7 Ohara 1.51633 64.150145
S-BSL7 Ohara 1.51633 64.142022
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-BK7HT Schott 1.5168 64.17
N-BK7 Schott 1.5168 64.17
N-BK7HTSultra Schott 1.5168 64.17
N-BK7HTi Schott 1.5168 64.17
BK7 Schott 1.5168 64.167336
BK7HT Schott 1.51633 64.14348
P-BK7 Schott 1.5164 64.06
BK8 Schott 1.520152 63.685744
PK2 Schott 1.518211 65.054286
BK7G18 Schott 1.51975 63.58
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