K-PFK80(M) by Sumita

Standard Common Environmentally Friendly

K-PFK80(M) by Sumita is a standard optical glass with a common melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.49533 and a Vd of 80.8. It has high thermal expansion (CTE of 13.4×10⁻⁶/K) and good 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) 1.49533
Abbe Number (Vd) 80.8
Dispersion Formula Schott
Wavelength Range 0.36 — 1.55 µm
$$n(\lambda) = \sqrt{2.2128 - 0.0056313\,\lambda^2 + 0.00831368\,\lambda^{-2} + 0.000157901\,\lambda^{-4} - 1.28845 \times 10^{-5}\,\lambda^{-6} + 8.47865 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 13.4
TCE 100/300°C (10-6/K) 15.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.91 \times 10^{-5} + 2(-2.54 \times 10^{-9})\,\Delta T + 3(-5.06 \times 10^{-11})\,\Delta T^2 + \frac{3.29 \times 10^{-7} + 2(5.19 \times 10^{-11})\,\Delta T}{\lambda - 0.188}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.6
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
S-FPL51Y Ohara 1.497003 81.138165
MC-FCD1-M20 Hoya 1.4969 81.51
MP-FCD1-M20 Hoya 1.4969 81.51
D-FK61-25 CDGM 1.49653 81.531772
D-FK61A-25 CDGM 1.49665 81.549116
S-FPL51 Ohara 1.496999 81.545888
M-FCD1 Hoya 1.4971 81.56
FCD1B Hoya 1.4971 81.56
D-FK61A CDGM 1.497 81.605419
H-FK61B CDGM 1.497 81.605419
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PFK80 Sumita 1.497 81.5
PFK80 Sumita 1.497 81.5
K-PFK85(M) Sumita 1.48375 85.0
K-PFK85 Sumita 1.48563 85.2
PFK85 Sumita 1.48563 85.2
K-PFK90(M) Sumita 1.45733 89.8
K-PG325 Sumita 1.5067 70.5
K-PFK90 Sumita 1.4588 90.0
FK5 Sumita 1.48749 70.4
K-FK5 Sumita 1.48749 70.4
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