SF15 by Sumita

Obsolete Very Rare Environmentally Dangerous

SF15 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.37 to 2.00 µm with an nd of 1.69895 and a Vd of 30.0. 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: 0.370–2.000 µm
Optical Properties
Refractive Index (nd) 1.69895
Abbe Number (Vd) 30.0
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{2.78957 - 0.0101819\,\lambda^2 + 0.0299253\,\lambda^{-2} + 0.0018309\,\lambda^{-4} - 0.000109553\,\lambda^{-6} + 1.42191 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 8.2
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) 4.08
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
E-FD15L Hoya 1.69895 30.05
E-FD15 Hoya 1.69895 30.05
H-ZF11 CDGM 1.69894 30.05045
FD15 Hoya 1.698945 30.050548
ZF11 CDGM 1.698949 30.065686
SF15 Schott 1.69895 30.07
C99-30 Corning 1.699002 30.107427
PBM35 Ohara 1.698947 30.121211
S-TIM35 Ohara 1.698947 30.127865
N-SF15 Schott 1.69892 30.2
Similar Glasses (Sumita)
Glass Manufacturer nd Vd Compare
K-CD300 Sumita 1.6922 29.6
K-SFLD8 Sumita 1.68893 31.1
K-SFLD8W Sumita 1.6891 31.2
SF8 Sumita 1.68893 31.2
K-CD300(M) Sumita 1.68558 29.9
K-CD120(M) Sumita 1.71466 29.6
K-SFLD1 Sumita 1.71736 29.5
SF1 Sumita 1.71736 29.5
SFN1 Sumita 1.72022 29.3
SF18 Sumita 1.72151 29.3
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