PK51A by Schott

Obsolete Unknown Environmentally Dangerous

PK51A by Schott is an obsolete optical glass. It transmits from 0.30 to 2.50 µm with an nd of 1.528554 and a Vd of 76.975515. It has high thermal expansion (CTE of 12.7×10⁻⁶/K), below average chemical resistance, very high relative cost, and dangerous environmental properties.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.3–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.3–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.300–2.500 µm
Optical Properties
Refractive Index (nd) 1.528554
Abbe Number (Vd) 76.975515
Dispersion Formula Sellmeier
Wavelength Range 0.3 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{1.15611\,\lambda^2}{\lambda^2 - 0.00585597} + \frac{0.153229\,\lambda^2}{\lambda^2 - 0.0194072} + \frac{0.785619\,\lambda^2}{\lambda^2 - 140.537}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 12.7
TCE 100/300°C (10-6/K) 14.4
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.98 \times 10^{-5} + 2(-6.06 \times 10^{-9})\,\Delta T + 3(1.6 \times 10^{-11})\,\Delta T^2 + \frac{4.16 \times 10^{-7} + 2(5.01 \times 10^{-10})\,\Delta T}{\lambda - 0.134}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.96
Relative Cost 29.87
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 2
Stain Resistance 0
Acid Resistance 51
Alkali Resistance 3
Phosphate Resistance 4
Notes

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Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
B29-77 Corning 1.528554 76.961514
S-FPM4 Ohara 1.52841 76.452824
S-FPM3 Ohara 1.53775 74.703119
FCD705 Hoya 1.55032 75.5
H-FK55 CDGM 1.5502 75.224681
B42-73 Corning 1.542198 73.473057
K-PSK500(M) Sumita 1.55 71.9
K-PFK80(M) Sumita 1.49533 80.8
K-PSK500 Sumita 1.55215 72.0
S-FPL51Y Ohara 1.497003 81.138165
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
N-PK51 Schott 1.52855 76.98
ULTRAN30 Schott 1.5483 74.244488
N-PK52A Schott 1.497 81.61
N-PK52 Schott 1.497005 81.633263
PK50 Schott 1.52054 69.712402
FK52 Schott 1.486052 81.802215
N-PSK58 Schott 1.56907 71.205585
FK5HTi Schott 1.48748 70.47
N-FK5 Schott 1.48749 70.41
FK5 Schott 1.48749 70.405771
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