SF14 by Schott

Obsolete Unknown Environmentally Dangerous

SF14 by Schott is an obsolete optical glass. It transmits from 0.39 to 2.50 µm with an nd of 1.76182 and a Vd of 26.53. It has medium thermal expansion (CTE of 6.6×10⁻⁶/K), excellent chemical resistance, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.39–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.39–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.390–2.500 µm
Optical Properties
Refractive Index (nd) 1.76182
Abbe Number (Vd) 26.53
Dispersion Formula Sellmeier
Wavelength Range 0.39 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.69183\,\lambda^2}{\lambda^2 - 0.0133152} + \frac{0.28592\,\lambda^2}{\lambda^2 - 0.0612647} + \frac{1.12595\,\lambda^2}{\lambda^2 - 118.405}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.6
TCE 100/300°C (10-6/K) 7.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[8.85 \times 10^{-6} + 2(1.81 \times 10^{-8})\,\Delta T + 3(-4.12 \times 10^{-11})\,\Delta T^2 + \frac{1.39 \times 10^{-6} + 2(1.53 \times 10^{-9})\,\Delta T}{\lambda - 0.279}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.54
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Notes

old, was replaced by N-SF14

Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
TIH14 Ohara 1.761821 26.517966
S-TIH14 Ohara 1.761821 26.517885
FD14 Hoya 1.761823 26.552048
PBH14W Ohara 1.761819 26.553651
PBH14 Ohara 1.761819 26.553651
ZF12 CDGM 1.761822 26.555686
K-SFLD14 Sumita 1.76182 26.5
SF14 Sumita 1.76182 26.5
H-ZF12 CDGM 1.76182 26.607986
FD140 Hoya 1.76182 26.61
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-SF14 Schott 1.76182 26.53
SF55 Schott 1.7618 26.950177
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
N-SF56 Schott 1.7847 26.1
SF56A Schott 1.7847 26.08
SFL56 Schott 1.7847 26.078312
Compare Glasses
    Compare Selected