K-PSKn2 by Sumita

Standard Rare Environmentally Friendly

K-PSKn2 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.618 and a Vd of 63.4. It has medium thermal expansion (CTE of 7.9×10⁻⁶/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: 0.310–2.000 µm
Optical Properties
Refractive Index (nd) 1.618
Abbe Number (Vd) 63.4
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.57889 - 0.0103814\,\lambda^2 + 0.0142336\,\lambda^{-2} + 0.00012483\,\lambda^{-4} + 1.74777 \times 10^{-5}\,\lambda^{-6} - 9.62048 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.9
TCE 100/300°C (10-6/K) 9.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-9.04 \times 10^{-6} + 2(1.1 \times 10^{-8})\,\Delta T + 3(-2.48 \times 10^{-10})\,\Delta T^2 + \frac{3.21 \times 10^{-7} + 2(4.56 \times 10^{-10})\,\Delta T}{\lambda - 0.226}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.63
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 5
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
PCD4 Hoya 1.618 63.4
H-ZPK1A CDGM 1.618 63.392702
N-PSK53A Schott 1.618 63.39
PHM52 Ohara 1.617999 63.386441
S-PHM52 Ohara 1.618 63.333504
S-PHM52Q Ohara 1.617999 63.321449
N-PSK53 Schott 1.62014 63.48
PSK53A Schott 1.620141 63.480444
PCD53 Hoya 1.620139 63.516754
D-ZPK1A-25 CDGM 1.61999 63.763831
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
PSKN2 Sumita 1.618 63.4
K-LaFK60(M) Sumita 1.62848 63.2
LAFK60 Sumita 1.63246 63.8
K-LaFK60 Sumita 1.63246 63.8
K-LaFK63(M) Sumita 1.63463 63.0
K-LaFK63 Sumita 1.6386 63.4
SK16 Sumita 1.62041 60.3
K-SK16RH Sumita 1.62041 60.3
SK16RH Sumita 1.62041 60.3
K-PSK300 Sumita 1.5995 65.6
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