# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
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REFERENCES: "<a href=\"http://refractiveindex.info/download/data/2017/ohara_2017-11-30.agf\">OHARA Zemax catalog 2017-11-30</a> (obtained from <a href=\"http://www.ohara-inc.co.jp/en/product/optical/list/\">http://www.ohara-inc.co.jp</a>)<br>See also <a href=\"http://refractiveindex.info/download/data/2017/ohara_2017-11-30.pdf\">OHARA glass data sheets</a>"
COMMENTS: "Low Softening Temperature"
DATA:
  - type: formula 2 
    wavelength_range: 0.3 2.4
    coefficients: 0 2.53279005 0.0186909889 0.583375125 0.0765409078 1.5299288 112.197368
  - type: tabulated k
    data: |
        0.420 3.7054E-06
        0.440 6.1048E-07
        0.460 1.9162E-07
        0.480 1.0063E-07
        0.500 6.8222E-08
        0.550 4.8411E-08
        0.600 6.7317E-08
        0.650 7.2927E-08
        0.700 6.7249E-08
        0.800 5.7555E-08
        0.900 2.1518E-08
        1.000 3.1895E-08
        1.200 3.8274E-08
        1.400 4.4653E-08
        1.600 1.1511E-07
        1.800 2.3104E-07
        2.000 5.1762E-07
        2.200 1.6319E-06
        2.400 4.0245E-06
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 1.61e-05 2.23e-08 -5.18e-11 3.36e-06 3.2e-09 0.311
    nd: 2.102999
    Vd: 18.051064
    glass_status: preferred
    density: 6.74 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.4e-06 K<sup>-1</sup>
    dPgF: 0.0439
    climatic_resistance: 2.0
    acid_resistance: 52.1
    phosphate_resistance: 2.0
