K-PBK60(M) by Sumita

Standard Rare Environmentally Friendly

K-PBK60(M) by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.52483 and a Vd of 62.0. It has low thermal expansion (CTE of 6.1×10⁻⁶/K) and average chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.36–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.36–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.270–2.000 µm
Optical Properties
Refractive Index (nd) 1.52483
Abbe Number (Vd) 62.0
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.29512 - 0.0113856\,\lambda^2 + 0.0111809\,\lambda^{-2} + 0.000183803\,\lambda^{-4} - 1.03284 \times 10^{-6}\,\lambda^{-6} + 1.0522 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.1
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[5.28 \times 10^{-6} + 2(1.64 \times 10^{-8})\,\Delta T + 3(-1.95 \times 10^{-10})\,\Delta T^2 + \frac{4.09 \times 10^{-7} + 2(6.61 \times 10^{-10})\,\Delta T}{\lambda - 0.179}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 2.45
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
BSC6 Hoya 1.531128 62.075664
BK6 Schott 1.531129 62.150728
B19-61 Corning 1.519061 61.386004
H-K90GTI CDGM 1.51948 63.291634
C40 Hoya 1.523 60.4016
UK50 Schott 1.522571 60.383109
H-BAK1 CDGM 1.53028 60.466139
BK7G18 Schott 1.51975 63.58
D-K59-25 CDGM 1.51698 63.4085
D-K59 CDGM 1.5176 63.499991
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PBK50 Sumita 1.5225 62.3
K-PBK60 Sumita 1.5274 62.3
K-PBK50(M) Sumita 1.52025 62.2
P-BK40 Sumita 1.5176 63.5
K-PBK40 Sumita 1.5176 63.5
K-PBK40(M) Sumita 1.51497 63.3
BALK3 Sumita 1.51835 60.3
K-PG375(M) Sumita 1.53922 62.7
K7 Sumita 1.51112 60.5
K-BK7 Sumita 1.51633 64.1
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