# 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/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: 0.34 2.325
    coefficients: 0 1.7403896 0.010339887 0.176996917 0.0484822765 1.76775413 136.671996
  - type: tabulated k
    data: |
        0.340 1.0585E-05
        0.350 4.2172E-06
        0.360 1.9857E-06
        0.370 1.0502E-06
        0.380 6.3721E-07
        0.390 4.3220E-07
        0.400 2.9321E-07
        0.420 1.7144E-07
        0.440 1.2838E-07
        0.460 9.6434E-08
        0.480 6.9381E-08
        0.500 4.4010E-08
        0.550 1.7542E-08
        0.600 2.8734E-08
        0.650 2.5928E-08
        0.700 2.2326E-08
        0.800 1.2745E-08
        0.900 1.4338E-08
SPECS:
    n_absolute: false
    wavelength_vacuum: false
    temperature: 25.0 °C
    thermal_dispersion:
      - type: "Schott formula"
        coefficients: 1.81e-07 7.4e-09 -3.48e-11 7.12e-07 8.78e-10 0.249
    nd: 1.730770
    Vd: 40.508156
    glass_code: 731405
    density: 3.24 g/cm<sup>3</sup>
    thermal_expansion:
      - temperature_range: -30 70 °C
        coefficient: 8.6e-06 K<sup>-1</sup>
      - temperature_range: 20 300 °C
        coefficient: 1.05e-05 K<sup>-1</sup>
    dPgF: -0.0031
    climatic_resistance: 2.0
    acid_resistance: 52.2
    phosphate_resistance: 3.1
