SF19 by Sumita

Obsolete Very Rare Environmentally Dangerous

SF19 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.34 to 2.00 µm with an nd of 1.6668 and a Vd of 33.1. 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: 0.340–2.000 µm
Optical Properties
Refractive Index (nd) 1.6668
Abbe Number (Vd) 33.1
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.69469 - 0.00943414\,\lambda^2 + 0.0265094\,\lambda^{-2} + 0.00129385\,\lambda^{-4} - 5.91419 \times 10^{-5}\,\lambda^{-6} + 8.32472 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.9
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) 4.02
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
N-SF19 Schott 1.66679 33.12
C67-33 Corning 1.666997 33.114648
FD19 Hoya 1.666797 33.059707
S-TIM39 Ohara 1.6668 33.054985
H-ZF39 CDGM 1.6668 33.053728
PBM39 Ohara 1.666799 33.046816
SF19 Schott 1.6668 33.005581
C72-32 Corning 1.672698 32.31788
N-SF5 Schott 1.67271 32.25
SF5 Schott 1.6727 32.21
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SF5 Sumita 1.6727 32.2
K-PSFn166 Sumita 1.663 34.4
K-PSFn166(M) Sumita 1.65858 34.4
SF9 Sumita 1.65446 33.8
SF12 Sumita 1.64831 33.8
SF2 Sumita 1.64769 33.9
BASF2 Sumita 1.66446 35.9
K-CD45(M) Sumita 1.68673 34.1
SF8 Sumita 1.68893 31.2
K-SFLD8W Sumita 1.6891 31.2
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