K-PSFn5(M) by Sumita

Obsolete Very Rare Environmentally Friendly

K-PSFn5(M) by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.37 to 2.00 µm with an nd of 1.91643 and a Vd of 22.4. It has medium thermal expansion (CTE of 10.8×10⁻⁶/K) and excellent chemical resistance.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.4–1.55 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.4–1.55 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.000 µm
Optical Properties
Refractive Index (nd) 1.91643
Abbe Number (Vd) 22.4
Dispersion Formula Schott
Wavelength Range 0.4 — 1.55 µm
$$n(\lambda) = \sqrt{3.48034 - 0.0113683\,\lambda^2 + 0.0580859\,\lambda^{-2} + 0.00347797\,\lambda^{-4} - 0.000151977\,\lambda^{-6} + 3.63187 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 10.8
TCE 100/300°C (10-6/K) 11.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.38 \times 10^{-6} + 2(2.43 \times 10^{-8})\,\Delta T + 3(-2.21 \times 10^{-10})\,\Delta T^2 + \frac{2.2 \times 10^{-6} + 2(1.89 \times 10^{-9})\,\Delta T}{\lambda - 0.277}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 5.22
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 1
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
SF58 Schott 1.917613 21.51112
REALVIEW_1.9_LIGHTWEIGHT Schott 1.922002 21.44
PBH72 Ohara 1.915356 21.171926
PBH71 Ohara 1.922864 21.288699
P-SF67 Schott 1.9068 21.4
FDS24-SW Hoya 1.92119 23.96
FDS24 Hoya 1.92119 23.96
FDS24-W Hoya 1.92119 23.96
PBH21 Ohara 1.922861 20.884172
FDS1 Hoya 1.922859 20.883457
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PSFn5 Sumita 1.9211 22.4
K-PSFn1 Sumita 1.9068 21.2
K-PSFn190 Sumita 1.9046 21.5
K-PSFn1(M) Sumita 1.89945 21.3
K-PSFn190(M) Sumita 1.89816 21.7
K-SFLDn3 Sumita 1.8467 23.8
K-SFLDn3W Sumita 1.8467 23.8
SFN3 Sumita 1.84666 23.9
SFLDN3 Sumita 1.84666 23.9
K-PSFn185 Sumita 1.8507 26.9
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