K-PSK500 by Sumita

Standard Rare Precision Molding Environmentally Friendly

K-PSK500 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 1.55215 and a Vd of 72.0. It has medium thermal expansion (CTE of 10.8×10⁻⁶/K), good chemical resistance, and precision molding compatibility.

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) 1.55215
Abbe Number (Vd) 72.0
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.37901 - 0.00678634\,\lambda^2 + 0.0107503\,\lambda^{-2} + 0.000172812\,\lambda^{-4} - 3.90247 \times 10^{-6}\,\lambda^{-6} + 2.28785 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 10.8
TCE 100/300°C (10-6/K) 12.9
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.34 \times 10^{-5} + 2(6.83 \times 10^{-9})\,\Delta T + 3(1.81 \times 10^{-11})\,\Delta T^2 + \frac{3.74 \times 10^{-7} + 2(5.55 \times 10^{-10})\,\Delta T}{\lambda - 0.195}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.76
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 2
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
MP-FCD500-20 Hoya 1.55352 71.72
MC-FCD500-20 Hoya 1.55352 71.72
FCD500 Hoya 1.55397 71.76
M-FCD500 Hoya 1.55332 71.69
B58-72 Corning 1.558086 71.998499
S-FPM5 Ohara 1.552 70.697068
B42-73 Corning 1.542198 73.473057
QUARTZ Generic Birefringent 1.544296 70.132045
ULTRAN30 Schott 1.5483 74.244488
D-ZPK7-25 CDGM 1.56854 71.235367
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PSK500(M) Sumita 1.55 71.9
K-GFK70(M) Sumita 1.56627 71.3
GFK70 Sumita 1.56907 71.3
K-GFK70 Sumita 1.56907 71.3
K-PMK155 Sumita 1.5582 68.2
K-PMK155(M) Sumita 1.55471 68.0
K-PMK30 Sumita 1.525 70.4
K-PMK30(M) Sumita 1.52002 70.2
K-GFK68(M) Sumita 1.58998 68.3
K-PG325 Sumita 1.5067 70.5
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