BK10 by Sumita

Obsolete Very Rare Environmentally Dangerous

BK10 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.29 to 2.00 µm with an nd of 1.49782 and a Vd of 67.0. It has good 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: 0.290–2.000 µm
Optical Properties
Refractive Index (nd) 1.49782
Abbe Number (Vd) 67.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.21801 - 0.0102447\,\lambda^2 + 0.00936172\,\lambda^{-2} + 0.000279877\,\lambda^{-4} - 2.37313 \times 10^{-5}\,\lambda^{-6} + 1.40716 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 6.9
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) 2.42
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BK10 Schott 1.497821 66.95447
N-BK10 Schott 1.49782 66.95
PK1 Schott 1.503781 66.921827
PC1 Hoya 1.503779 66.88712
BSL21 Ohara 1.503779 66.814545
H-K2 CDGM 1.50047 66.020774
BSC4 Hoya 1.50048 65.996466
A88-66 Corning 1.487502 65.807152
BSC3 Hoya 1.498309 65.130542
BK3 Schott 1.498311 65.063609
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
BK4 Sumita 1.50048 66.0
BK3 Sumita 1.49831 65.1
K-PG325(M) Sumita 1.50506 70.4
FK5 Sumita 1.48749 70.4
K-FK5 Sumita 1.48749 70.4
K-PG325 Sumita 1.5067 70.5
BK7 Sumita 1.51633 64.1
K-BK7 Sumita 1.51633 64.1
BK1 Sumita 1.51009 63.4
K-PBK40(M) Sumita 1.51497 63.3
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