BK1 by Schott

Obsolete Unknown Environmentally Dangerous

BK1 by Schott is an obsolete optical glass. It transmits from 0.33 to 2.33 µm with an nd of 1.510091 and a Vd of 63.464788. It has medium thermal expansion (CTE of 7.7×10⁻⁶/K) and 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
Transmission Calculator
Valid wavelength range: 0.334–2.325 µm
Optical Properties
Refractive Index (nd) 1.510091
Abbe Number (Vd) 63.464788
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.04251\,\lambda^2}{\lambda^2 - 0.00616569} + \frac{0.20838\,\lambda^2}{\lambda^2 - 0.0212153} + \frac{0.980148\,\lambda^2}{\lambda^2 - 109.061}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.7
TCE 100/300°C (10-6/K) 8.8
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.87 \times 10^{-7} + 2(1.12 \times 10^{-8})\,\Delta T + 3(-1.44 \times 10^{-10})\,\Delta T^2 + \frac{4.92 \times 10^{-7} + 2(-1.45 \times 10^{-10})\,\Delta T}{\lambda - 0.147}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.46
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 —
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BSC1 Hoya 1.510091 63.435118
BK1 Sumita 1.51009 63.4
B10-63 Corning 1.509992 63.551713
H-K5 CDGM 1.510072 63.364525
BSL1 Ohara 1.510091 63.635037
K-PBK40(M) Sumita 1.51497 63.3
D-K9-25 CDGM 1.51577 63.989637
D-K9GT-25 CDGM 1.51577 63.989637
D-K59-25 CDGM 1.51698 63.4085
S-BSL7R Ohara 1.51633 63.881689
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
AF32ECO Schott 1.511531 62.574031
P-BK7 Schott 1.5164 64.06
BK7HT Schott 1.51633 64.14348
BK7 Schott 1.5168 64.167336
N-BK7HTSultra Schott 1.5168 64.17
N-BK7 Schott 1.5168 64.17
N-BK7HT Schott 1.5168 64.17
N-BK7HTi Schott 1.5168 64.17
UBK7 Schott 1.516801 64.289727
BK7G18 Schott 1.51975 63.58
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