SF12 by Sumita

Obsolete Very Rare Environmentally Dangerous

SF12 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.35 to 2.00 µm with an nd of 1.64831 and a Vd of 33.8. It has excellent 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: 0.350–2.000 µm
Optical Properties
Refractive Index (nd) 1.64831
Abbe Number (Vd) 33.8
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.63642 - 0.0083154\,\lambda^2 + 0.0262824\,\lambda^{-2} + 0.000840846\,\lambda^{-4} - 7.45513 \times 10^{-6}\,\lambda^{-6} + 5.4381 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 9.6
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) 3.73
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
FD12 Hoya 1.648308 33.793909
SF12 Schott 1.64831 33.841187
PBM22 Ohara 1.647689 33.802937
S-TIM22 Ohara 1.647689 33.792803
N-SF2 Schott 1.64769 33.82
FD2 Hoya 1.647693 33.836872
ZF1 CDGM 1.647693 33.836872
E-FD2 Hoya 1.64769 33.84
H-ZF1 CDGM 1.64769 33.840317
SF2 Schott 1.64769 33.85
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
SF2 Sumita 1.64769 33.9
SF9 Sumita 1.65446 33.8
SF7 Sumita 1.6398 34.6
K-PSFn166(M) Sumita 1.65858 34.4
K-PSFn166 Sumita 1.663 34.4
F6 Sumita 1.63636 35.4
SF19 Sumita 1.6668 33.1
BASF2 Sumita 1.66446 35.9
K-PG395(M) Sumita 1.65296 36.8
K-PG395 Sumita 1.658 36.9
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