# 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="https://refractiveindex.info/download/data/2017/schott_2017-01-20b.agf">SCHOTT Zemax catalog 2017-01-20b</a> (obtained from <a href="https://www.schott.com/en-us/products/optical-glass-p1000267/downloads/">http://www.schott.com</a>)<br>See also <a href="https://refractiveindex.info/download/data/2017/schott_2017-01-20.pdf">SCHOTT glass data sheets</a>
COMMENTS: |
    was replaced by N-SF66
DATA:
  - type: formula 2
    wavelength_range: 0.39 2.5
    coefficients: 0 2.07842233 0.0180875134 0.407120032 0.0679493572 1.76711292 215.266127
  - type: tabulated k
    data: |
        0.390 3.7189E-06
        0.400 1.8171E-06
        0.405 1.3908E-06
        0.420 6.6083E-07
        0.436 3.6273E-07
        0.460 1.7063E-07
        0.500 5.6702E-08
        0.546 2.6267E-08
        0.580 2.2288E-08
        0.620 2.1829E-08
        0.660 2.3237E-08
        0.700 2.2394E-08
        1.060 1.6913E-08
        1.530 4.8947E-08
        1.970 5.2286E-07
        2.325 2.2284E-06
        2.500 2.8383E-06
PROPERTIES:
    nd: 1.92286
    Vd: 20.88
    glass_code: 923209.603
    glass_status: preferred
    density:
      - value: 6025
    thermal_expansion:
      - temperature_range: 243 343
        value: 9.01e-06
      - temperature_range: 293 573
        value: 1.148e-05
    dPgF: 0.0197
    resistance:
        climatic: 2.0
        stain: 5.0
        acid: 53.4
        alkali: 2.3
        phosphate: 4.2