SF55 by Schott

Obsolete Unknown Environmentally Dangerous

SF55 by Schott is an obsolete optical glass. It transmits from 0.38 to 2.33 µm with an nd of 1.7618 and a Vd of 26.950177. It has medium thermal expansion (CTE of 8.2×10⁻⁶/K), average chemical resistance, moderate relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.325 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.325 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.380–2.325 µm
Optical Properties
Refractive Index (nd) 1.7618
Abbe Number (Vd) 26.950177
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.325 µm
$$n(\lambda) = \sqrt{1 + \frac{1.64681\,\lambda^2}{\lambda^2 - 0.0128731} + \frac{0.33154\,\lambda^2}{\lambda^2 - 0.0564818} + \frac{1.02466\,\lambda^2}{\lambda^2 - 116.271}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 8.2
TCE 100/300°C (10-6/K) 9.2
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.99 \times 10^{-6} + 2(1.73 \times 10^{-8})\,\Delta T + 3(-2.19 \times 10^{-11})\,\Delta T^2 + \frac{1.52 \times 10^{-6} + 2(1.44 \times 10^{-9})\,\Delta T}{\lambda - 0.267}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.72
Relative Cost 3.57
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 2
Acid Resistance 3
Alkali Resistance 2
Phosphate Resistance 3
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
FDS5 Hoya 1.761804 26.914901
D62-27 Corning 1.761802 26.90455
PBH25 Ohara 1.761797 27.107724
PBH25W Ohara 1.761797 27.107726
FD140 Hoya 1.76182 26.61
H-ZF12 CDGM 1.76182 26.607986
ZF12 CDGM 1.761822 26.555686
PBH14 Ohara 1.761819 26.553651
PBH14W Ohara 1.761819 26.553651
FD14 Hoya 1.761823 26.552048
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF14 Schott 1.76182 26.53
SF14 Schott 1.76182 26.53
SFL4 Schott 1.7552 27.206054
N-SF4 Schott 1.75513 27.38
SF4 Schott 1.7552 27.58
SF63 Schott 1.7484 27.713565
SF13 Schott 1.740771 27.59998
SF54 Schott 1.7408 28.090813
SF3 Schott 1.74 28.2
N-SF56 Schott 1.7847 26.1
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