{
  "ALIASES": [], 
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    "surface_tension": {
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      "description": "sigma = sum(a_i*(1-T/Tc)^n_i)", 
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  "CAS": "75-69-4", 
  "ENVIRONMENTAL": {
    "ASHRAE34": "A1", 
    "FH": 1, 
    "GWP100": 4750.0, 
    "GWP20": 6730.0, 
    "GWP500": 1620.0, 
    "HH": 1, 
    "Name": "R11", 
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  "NAME": "R11"
}