# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: "<a href=\"http://refractiveindex.info/download/data/2017/schott_2017-01-20b.agf\">SCHOTT Zemax catalog 2017-01-20b</a> (obtained from <a href=\"http://www.schott.com/advanced_optics/english/download/\">http://www.schott.com</a>)<br>See also <a href=\"http://refractiveindex.info/download/data/2017/schott_2017-01-20.pdf\">SCHOTT glass data sheets</a>"
COMMENTS: "was replaced by N-FK51A"
DATA:
  - type: formula 2 
    wavelength_range: 0.29 2.5
    coefficients: 0 0.971247817 0.00472301995 0.216901417 0.0153575612 0.904651666 168.68133
  - type: tabulated k
    data: |
        0.290 4.2510E-06
        0.300 3.2013E-06
        0.310 2.0922E-06
        0.320 1.2264E-06
        0.334 4.9122E-07
        0.350 1.4877E-07
        0.365 4.3803E-08
        0.370 2.8611E-08
        0.380 1.4603E-08
        0.390 9.9712E-09
        0.400 8.9440E-09
        0.405 9.0558E-09
        0.420 1.0738E-08
        0.436 1.1147E-08
        0.460 1.0286E-08
        0.500 6.3790E-09
        0.546 5.2218E-09
        0.580 5.5469E-09
        0.620 7.9099E-09
        0.660 1.0531E-08
        0.700 1.1169E-08
        1.060 2.0305E-08
        1.530 9.8390E-08
        1.970 3.8800E-07
        2.325 1.2903E-06
        2.500 2.2893E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 20.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: -1.83e-05 -7.89e-09 -1.63e-12 3.74e-07 3.46e-10 0.15
    nd: 1.48656
    Vd: 84.47
    glass_code: 487845.366
    glass_status: preferred
    density: 3.66 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 1.33e-05 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.549e-05 K<sup>-1</sup>
    dPgF: 0.0342
    climatic_resistance: 2.0
    stain_resistance: 0.0
    acid_resistance: 52.3
    alkali_resistance: 2.2
    phosphate_resistance: 4.3
