K-PSFn202(M) by Sumita

Obsolete Very Rare Environmentally Friendly

K-PSFn202(M) by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.39 to 2.00 µm with an nd of 2.01365 and a Vd of 21.4. It has medium thermal expansion (CTE of 7.4×10⁻⁶/K) and average 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: 0.390–2.000 µm
Optical Properties
Refractive Index (nd) 2.01365
Abbe Number (Vd) 21.4
Dispersion Formula Schott
Wavelength Range 0.4 — 1.55 µm
$$n(\lambda) = \sqrt{3.82905 - 0.0164706\,\lambda^2 + 0.0651129\,\lambda^{-2} + 0.00598658\,\lambda^{-4} - 0.000531161\,\lambda^{-6} + 7.80764 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 7.4
TCE 100/300°C (10-6/K) 8.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.41 \times 10^{-5} + 2(2.66 \times 10^{-8})\,\Delta T + 3(-5.37 \times 10^{-10})\,\Delta T^2 + \frac{2.35 \times 10^{-6} + 2(1.36 \times 10^{-9})\,\Delta T}{\lambda - 0.301}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 6.22
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 4
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
P-SF68 Schott 2.0052 21.0
D-ZF93 CDGM 2.0017 20.700195
D-ZF93-25 CDGM 1.9998 20.686444
E-FDS2 Hoya 2.00272 19.32
TAFD43 Hoya 2.002944 23.512743
M-FDS2 Hoya 2.00178 19.32
MP-FDS2 Hoya 2.00178 19.32
MC-FDS2 Hoya 2.00178 19.32
H-ZLAF90 CDGM 2.00069 25.425752
H-ZLAF90A CDGM 2.00069 25.458056
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PSFn203(M) Sumita 2.01105 20.8
K-PSFn203 Sumita 2.017 20.8
K-PSFn202 Sumita 2.0196 21.5
K-PSFn202P Sumita 2.0216 21.4
K-PSFn2 Sumita 2.0017 20.6
K-PSFn2(M) Sumita 1.9967 20.6
K-BOC30 Sumita 2.0068 26.2
K-BOC20 Sumita 2.0054 27.7
K-PSFn5 Sumita 1.9211 22.4
K-PSFn5(M) Sumita 1.91643 22.4
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