N-PSK57 by Schott

Obsolete Unknown Environmentally Friendly

N-PSK57 by Schott is an obsolete optical glass. It transmits from 0.28 to 1.97 µm with an nd of 1.5924 and a Vd of 68.398667. It has high thermal expansion (CTE of 13.2×10⁻⁶/K), below average chemical resistance, and high relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.334–2.235 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.334–2.235 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.280–1.970 µm
Optical Properties
Refractive Index (nd) 1.5924
Abbe Number (Vd) 68.398667
Dispersion Formula Sellmeier
Wavelength Range 0.334 — 2.235 µm
$$n(\lambda) = \sqrt{1 + \frac{0.988511\,\lambda^2}{\lambda^2 - 0.00478398} + \frac{0.510855\,\lambda^2}{\lambda^2 - 0.015802} + \frac{0.758837\,\lambda^2}{\lambda^2 - 129.709}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 13.2
TCE 100/300°C (10-6/K) 14.8
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) 4.48
Relative Cost 20.42
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 51
Alkali Resistance 1
Phosphate Resistance 4
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
D-ZPK5 CDGM 1.5928 68.342024
H-ZPK5 CDGM 1.5928 68.342024
K-GFK68 Sumita 1.5924 68.3
GFK68 Sumita 1.5924 68.3
D-ZPK5-25 CDGM 1.59216 68.281511
FCD515 Hoya 1.59282 68.62
FCD505 Hoya 1.59282 68.62
K-GFK68(M) Sumita 1.58998 68.3
K-PSK400 Sumita 1.595 67.8
K-PSK400(M) Sumita 1.59179 67.7
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
PSK52 Schott 1.603101 65.409791
PSK54 Schott 1.58599 64.599863
N-PSK58 Schott 1.56907 71.205585
PSK50 Schott 1.557529 67.282893
N-PSK53A Schott 1.618 63.39
PSK53A Schott 1.620141 63.480444
N-PSK53 Schott 1.62014 63.48
PSK2 Schott 1.56873 63.083014
N-SK5 Schott 1.58913 61.27
N-SK5HTi Schott 1.58913 61.27
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