PFK80 by Sumita

Obsolete Very Rare Environmentally Dangerous

PFK80 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.27 to 2.00 µm with an nd of 1.497 and a Vd of 81.5. It has good chemical resistance and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.270–2.000 µm
Optical Properties
Refractive Index (nd) 1.497
Abbe Number (Vd) 81.5
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.21816 - 0.00578864\,\lambda^2 + 0.00817511\,\lambda^{-2} + 0.000162592\,\lambda^{-4} - 1.00266 \times 10^{-5}\,\lambda^{-6} + 5.6977 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 15.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
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
MP-FCD1-M20 Hoya 1.4969 81.51
MC-FCD1-M20 Hoya 1.4969 81.51
S-FPL51 Ohara 1.496999 81.545888
FCD1B Hoya 1.4971 81.56
M-FCD1 Hoya 1.4971 81.56
D-FK61A-25 CDGM 1.49665 81.549116
D-FK61-25 CDGM 1.49653 81.531772
D-FK61A CDGM 1.497 81.605419
H-FK61B CDGM 1.497 81.605419
N-PK52A Schott 1.497 81.61
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-PFK80 Sumita 1.497 81.5
K-PFK80(M) Sumita 1.49533 80.8
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-PFK90 Sumita 1.4588 90.0
K-PG325 Sumita 1.5067 70.5
K-PG325(M) Sumita 1.50506 70.4
K-FK5 Sumita 1.48749 70.4
Compare Glasses
    Compare Selected